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  • 1.
    Anastasi, A.
    et al.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.;Univ Messina, Dipartimento Fis & Sci Terra, Messina, Italy..
    Babusci, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Bencivenni, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Berlowski, M.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Bloise, C.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Bossi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Branchini, P.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Budano, A.
    Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Balkeståhl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Ciambrone, R.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Curciarello, F.
    Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy.;Univ Messina, Dipartimento Fis & Sci Terra, Messina, Italy.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    D'Agostini, G.
    Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Dane, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    De Leo, V.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    De Lucia, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    De Santis, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    De Simone, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Di Cicco, A.
    Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Di Domenico, A.
    Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Di Salvo, R.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Domenici, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    D'Uffizi, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Fantini, A.
    Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Felici, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Fiore, S.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.;Casaccia RC, ENEA UTTMAT IRR, Rome, Italy..
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Gauzzi, P.
    Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Giardina, G.
    Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy.;Univ Messina, Dipartimento Fis & Sci Terra, Messina, Italy..
    Giovannella, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Graziani, E.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Happacher, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Heijkenskjold, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Andersson, Walter Ikegami
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Krzemien, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Kupsc, Andrezej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Univ Rome Tre, Dipartimento Matemat & Fis, I-00146 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Mandaglio, G.
    Univ Messina, Dipartimento Fis & Sci Terra, Messina, Italy.;Ist Nazl Fis Nucl, Grp Collegato Messina, Messina, Italy..
    Martini, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.;Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy..
    Mascolo, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Messi, R.
    Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Miscetti, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Morello, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Moricciani, D.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Moskal, P.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Palladino, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Papenbrock, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Passeri, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Patera, V.
    Univ Roma La Sapienza, Dipartimento Sci Base & Applicate Ingn, I-00185 Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    del Rio, E. Perez
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Ranieri, A.
    Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy..
    Santangelo, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Sarra, I.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, Italy.;Ist Nazl Fis Nucl, Grp Collegato Cosenza, Arcavacata Di Rende, Italy..
    Silarski, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Sirghi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Tortora, L.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Venanzoni, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy..
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Limit on the production of a low-mass vector boson in e(+)e(-) -> U gamma, U -> e(+)e(-) with the KLOE experiment2015In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 750, p. 633-637Article in journal (Refereed)
    Abstract [en]

    The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DA Phi NE e(+)e(-) collider. Using an integrated luminosity of 1.54 fb(-1), we studied the process e(+)e(-) -> U gamma, with U -> e(+)e(-), using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, epsilon(2), at 10(-6)-10(-4) in the 5-520 MeV/c(2) mass range.

  • 2. Anastasi, A.
    et al.
    Babusci, D.
    Bencivenni, G.
    Berlowski, M.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Caldeira Balkeståh, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, B.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Ciambrone, P.
    Curciarello, F.
    Czerwiński, E.
    D'Agostini, G.
    Danè, E.
    De Leo, V.
    De Lucia, E.
    De Santis, A.
    De Simone, P.
    Di Cicco, A.
    Di Domenico, A.
    Di Salvo, R.
    Domenici, D.
    D'Uffizi, A.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Gajos, A.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ikegami Andersson, Walter
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kamińska, D.
    Krzemien, W.
    Kupsc, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Mandaglio, G.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Palladino, A.
    Papenbrock, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Passeri, A.
    Patera, V.
    Perez del Rio, E.
    Ranieri, A.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Silarski, M.
    Sirghi, F.
    Tortora, L.
    Venanzoni, G.
    Wiślicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, p. 356-361Article in journal (Refereed)
    Abstract [en]

    Abstract The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

  • 3. Anastasi, A.
    et al.
    Babusci, D.
    Bencivenni, G.
    Berlowski, M.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Caldeira Balkeståh, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Ciambrone, P.
    Curciarello, F.
    Czerwinski, E.
    D’Agostini, G.
    Danè, E.
    De Leo, V.
    De Lucia, E.
    De Santis, A.
    De Simone, P.
    Di Cicco, A.
    Di Domenico, A.
    Di Salvo, R.
    Domenici, D.
    D’Uffizi, A.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Gajos, A.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ikegami Andersson, Walter
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kaminska, D.
    Krzemien, W.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Mandaglio, G.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Papenbrock, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Passeri, A.
    Patera, V.
    Perez del Rio, E.
    Ranieri, A.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Silarski, M.
    Sirghi, F.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Precision measurement of the η → π + π − π 0 Dalitz plot distribution with the KLOE detector2016In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 5, article id 019Article in journal (Refereed)
    Abstract [en]

    Using 1.6 fb−1 of e + e − → ϕ → ηγ data collected with the KLOE detector at DAΦNE, the Dalitz plot distribution for the η → π + π − π 0 decay is studied with the world’s largest sample of ∼ 4.7 · 106 events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables X and Y . The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a gX 2 Y term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.

  • 4.
    Anastasi, A.
    et al.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.;Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy..
    Babusci, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Bencivenni, G.
    Berlowski, M.
    Bloise, C.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Bossi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Branchini, R.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Budano, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Caldeira Balkeståhl, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Ciambrone, R.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Curciarello, F.
    Ist Nazl Fis Nucl, Sez Catania, Catania, Italy.;Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Dane, E.
    De Leo, V.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    De Lucia, E.
    De Santis, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    De Simone, R.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Di Cicco, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Di Salvo, R.
    Domenici, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    D'Uffizi, A.
    Fantini, A.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Felici, G.
    Fiore, S.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.;Casaccia RC, ENEA UTTMAT IRR, Rome, Italy..
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Gauzzi, R.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy..
    Giardina, G.
    Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy..
    Giovannella, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Graziani, E.
    Happacher, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kaminska, D.
    Krzemien, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Lukin, P. A.
    Novosibirsk State Univ, Novosibirsk 630090, Russia.;Budker Inst Nucl Phys, Novosibirsk 630090, Russia..
    Mandaglio, G.
    Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy.;Ist Nazl Fis Nucl, Grp Collegato Messina, Messina, Italy..
    Martini, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.;Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy..
    Mascolo, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Messi, R.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Miscetti, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Morello, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Moricciani, D.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy..
    Moskal, R.
    Papenbrock, M.
    Passeri, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Patera, V.
    Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy..
    del Rio, E. Perez
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Ranieri, A.
    Ist Nazl Fis Nucl, Sez Bari, Bari, Italy..
    Santangelo, R.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Sarra, I.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy.;Ist Nazl Fis Nucl, Grp Collegato Cosenza, Arcavacata Di Rende, Italy..
    Selce, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy..
    Silarski, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Sirghi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Tortora, L.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy..
    Venanzoni, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy..
    Wislicki, W.
    Wolke, M.
    Jegerlehner, F.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Humboldt Univ, Inst Phys, Berlin, Germany.;Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany..
    Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector2017In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 767, p. 485-492Article in journal (Refereed)
    Abstract [en]

    We have measured the running of the effective QED coupling constant alpha(s) in the time-like region 0.6 < root s < 0.975 GeV with the KLOE detector at DA Phi NE using the Initial-State Radiation process e(+) e(-) -> mu(+) mu(-)gamma. It represents the first measurement of the running of alpha(s) in this energy region. Our results show a more than 5 sigma significance of the hadronic contribution to the running of alpha(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e(+) e(-) -> pi(+) pi(-) cross section measured by KLOE, the real and imaginary parts of the shift Delta alpha(s) have been extracted. From a fit of the real part of Delta alpha(s) and assuming the lepton universality the branching ratio BR(omega -> mu(+) mu(-)) = (6.6 +/- 1.4(stat) +/- 1.7(syst)) (.) 10 (5)has been determined.

  • 5.
    Anastasi, A.
    et al.
    INFN, Lab Nazl Frascati, Frascati, Italy.;Univ Messina, Dipartimento Sci Matemat & Informat Sci Fis & Sci, Messina, Italy..
    Babusci, D.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Berlowski, M.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Bloise, C.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Bossi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Branchini, P.
    INFN, Sez Roma Tre, Rome, Italy..
    Budano, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Balkeståhl, Li Caldeira
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Ciambrone, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Curciarello, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Dane, E.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Leo, V.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    De Lucia, E.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Santis, A.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Simone, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Di Cicco, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Domenici, D.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    D'Uffizi, A.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Fantini, A.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma Tor Vergata, Rome, Italy..
    Fantini, G.
    Gran Sasso Sci Inst, Laquila, Italy..
    Fermani, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Fiore, S.
    INFN, Sez Roma, Rome, Italy.;ENEA, Dept Fusion & Technol Nucl Safety & Secur, Frascati, RM, Italy..
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Gauzzi, P.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Giovannella, S.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Graziani, E.
    INFN, Sez Roma Tre, Rome, Italy..
    Ivanov, V. L.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kang, X.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Kisielewska-Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Kozyrev, E. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Krzemien, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Lukin, P. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Mandaglio, G.
    INFN, Sez Catania, Catania, Italy.;Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy..
    Martini, M.
    INFN, Lab Nazl Frascati, Frascati, Italy.;Univ Guglielmo Marconi, Dipartimento Sci &Tecnol Applicate, Rome, Italy..
    Messi, R.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma Tor Vergata, Rome, Italy..
    Miscetti, S.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Morello, G.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Moricciani, D.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    Moskal, P.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Passeri, A.
    INFN, Sez Roma Tre, Rome, Italy..
    Patera, V.
    Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    del Rio, E. Perez
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Raha, N.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    Santangelo, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy.;INFN, Grp Collegato Cosenza, Arcavacata Di Rende, Italy..
    Selce, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Silarski, M.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Sirghi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Solodov, E. P.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Tortora, L.
    INFN, Sez Roma Tre, Rome, Italy..
    Venanzoni, G.
    INFN, Sez Pisa, Pisa, Italy..
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Keshavarzi, A.
    Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside, England..
    Mueller, S. E.
    Helmholtz Zentrum Dresden Rossendorf, Dept Informat Serv & Comp, Dresden, Germany.;Helmholtz Zentrum Dresden Rossendorf, Inst Radiat Phys, Dresden, Germany..
    Teubner, T.
    Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside, England..
    Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV22018In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 3, article id 173Article in journal (Refereed)
    Abstract [en]

    The three precision measurements of the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of a(mu)(pi+pi-) (489.8 +/- 1.7(stat) +/- 4.8(sys)) x 10(-10).

  • 6.
    Anastasi, A.
    et al.
    Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy;Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Babusci, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Berlowski, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Natl Ctr Nucl Res, Warsaw, Poland.
    Bloise, C.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Bossi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Branchini, P.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Budano, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Capon, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Ceradini, F.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Ciambrone, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Curciarello, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Dane, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Leo, V.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    De Lucia, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Santis, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Simone, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Di Cicco, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Domenici, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    D'Uffizi, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Fantini, A.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy;Univ Tor Vergata, Dipartimento Fis, Rome, Italy.
    Fantini, G.
    Gran Sasso Sci Inst, Laquila, Italy.
    Fermani, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Fiore, S.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy;Casaccia RC, ENEA UTTMAT IRR, Rome, Italy.
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Gauzzi, P.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Giovannella, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Graziani, E.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Ivanov, V. L.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kang, X.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Kisielewska-Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Kozyrev, E. A.
    Novosibirsk State Univ, Novosibirsk, Russia.
    Krzemien, W.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Loffredo, S.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Lukin, P. A.
    Novosibirsk State Univ, Novosibirsk, Russia.
    Mandaglio, G.
    Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy;Ist Nazl Fis Nucl, Sez Catania, Catania, Italy.
    Martini, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy.
    Messi, R.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy;Univ Tor Vergata, Dipartimento Fis, Rome, Italy.
    Miscetti, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Moricciani, D.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    Moskal, P.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Passeri, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Patera, V.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy;Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy.
    del Rio, E. Perez
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Raha, N.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    Santangelo, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy;Ist Nazl Fis Nucl, Grp Collegato Cosenza, Arcavacata Di Rende, Italy.
    Selce, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Silarski, M.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Sirghi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Horia Hulubei Natl Inst Phys & Nucl Engn, Magurele, Romania.
    Solodov, E. P.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Tortora, L.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Venanzoni, G.
    Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy.
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Measurement of the charge asymmetry for the K-S -> pi e nu decay and test of CPT symmetry with the KLOE detector2018In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, article id 021Article in journal (Refereed)
    Abstract [en]

    Using 1.63 fb(-1) of integrated luminosity collected by the KLOE experiment about 7 x 10(4) K-S -> pi(+/-)e(-/+)nu decays have been reconstructed. The measured value of the charge asymmetry for this decay is A(S) = (-4.9 +/- 5.7(stat) +/- 2.6(syst)) x 10(-3) which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives A(S) = (3.8 +/- 5.0(stat) +/- 2.6(syst)) x 10(-3) and, together with the asymmetry of the K-L semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

  • 7.
    Anastasi, A.
    et al.
    INFN, Lab Nazl Frascati, Frascati, Italy;Univ Messina, Sci Fis & Sci Terra, Dipartimento Sci Matemat & Informat, Messina, Italy.
    Babusci, D.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Berlowski, M.
    INFN, Lab Nazl Frascati, Frascati, Italy;Natl Ctr Nucl Res, Warsaw, Poland.
    Bloise, C.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Bossi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Branchini, R.
    INFN, Sez Roma Tre, Rome, Italy.
    Budano, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy;INFN, Sez Roma Tre, Rome, Italy.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ceradini, F.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy;INFN, Sez Roma Tre, Rome, Italy.
    Ciambrone, R.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Curciarello, F.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;INFN, Sez Roma, Rome, Italy.
    Dane, E.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    De Leo, V.
    INFN, Sez Roma Tor Vergata, Rome, Italy.
    De Lucia, E.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    De Santis, A.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    De Simone, R.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Di Cicco, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy;INFN, Sez Roma Tre, Rome, Italy.
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;INFN, Sez Roma, Rome, Italy.
    Domenici, D.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    D'Uffizi, A.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Fantini, A.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy;INFN, Sez Roma Tor Vergata, Rome, Italy.
    Fantini, G.
    Gran Sasso Sci Inst, Laquila, Italy.
    Fermani, R.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Fiore, S.
    INFN, Sez Roma, Rome, Italy;ENEA, Dept Fus & Technol Nucl Safety & Secur, Frascati, RM, Italy.
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Gauzzi, R.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;INFN, Sez Roma, Rome, Italy.
    Giovannella, S.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Graziani, E.
    INFN, Sez Roma Tre, Rome, Italy.
    Ivanov, V. L.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kang, X.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Kisielewska-Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Kozyrev, E. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Krzemien, W.
    Natl Ctr Nucl Res, Warsaw, Poland.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Lukin, P. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Mandaglio, G.
    INFN, Sez Catania, Catania, Italy;Univ Messina, Dipartimento Sci Chim, Biol Farmaceut & Ambientali, Messina, Italy.
    Martini, M.
    INFN, Lab Nazl Frascati, Frascati, Italy;Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Appl, Rome, Italy.
    Messi, R.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy;INFN, Sez Roma Tor Vergata, Rome, Italy.
    Miscetti, S.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Moricciani, D.
    INFN, Sez Roma Tor Vergata, Rome, Italy.
    Moskal, R.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Passeri, A.
    INFN, Sez Roma Tre, Rome, Italy.
    Patera, V.
    Univ Sapienza, Dipartimento Sci Base & Appl Ingn, Rome, Italy;INFN, Sez Roma, Rome, Italy.
    del Rio, E. Perez
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Raha, N.
    INFN, Sez Roma Tor Vergata, Rome, Italy.
    Santangelo, R.
    INFN, Lab Nazl Frascati, Frascati, Italy.
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy;INFN, Grp Collegato Cosenza, Arcavacata Di Rende, Italy.
    Selce, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy;INFN, Sez Roma Tre, Rome, Italy.
    Silarski, M.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Sirghi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy;Horia Hulubei Natl Inst Phys & Nucl Engn, Magurele, Romania.
    Solodov, E. P.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Tortora, L.
    INFN, Sez Roma Tre, Rome, Italy.
    Venanzoni, G.
    INFN, Sez Pisa, Pisa, Italy.
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Combined limit on the production of a light gauge boson decaying into mu(+) mu(-) and pi(+) pi(-)2018In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 784, p. 336-341Article in journal (Refereed)
    Abstract [en]

    We searched for the mu(+) mu(-) decay of a light vector gauge boson, also known as dark photon, in the e(+) e(-) -> mu(+) mu(-) gamma(ISR) process by means of the Initial State Radiation (ISR) method. We used 1.93fb(-1) of data collected by the KLOE experiment at the DA Phi NE phi-factory. No structures have been observed over the irreducible mu(+) mu(-) background. A 90% CL limit on the ratio epsilon(2)= alpha'/alpha between the dark coupling constant and the fine structure constant of 3 x 10(-6)-2 x 10(-7) has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e(+) e(-) -> pi(+) pi(-) gamma(ISR) events. The combined 90% CL limit increases the sensitivity especially in the rho-omega interference region and excludes epsilon(2) greater than (13 - 2) x 10(-7). For dark photon masses greater than 600 MeV the combined limit is lower than 8 x 10(-7) resulting more stringent than present constraints from other experiments.

  • 8. Anastasi, Antonio
    et al.
    Caldeira Balkeståh, Li
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Cao, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Heijkenskjöld, Lena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Ikegami Andersson, Walter
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Johansson, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Kupsc, Andrzej
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Papenbrock, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Wolke, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
    Measurement of the ϕ→π0e+e− transition form factor with the KLOE detector2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, p. 362-367Article in journal (Refereed)
    Abstract [en]

    A measurement of the vector to pseudoscalar conversion decay ϕ→π0e+e− with the KLOE experiment is presented. A sample of ∼9500 signal events was selected from a data set of 1.7 fb−1 of e+e− collisions at s√∼mϕ collected at the DAΦNE e+e− collider. These events were used to obtain the first measurement of the transition form factor |Fϕπ0(q2)| and a new measurement of the branching ratio of the decay: BR(ϕ→π0e+e−)=(1.35±0.05+0.05−0.10)×10−5. The result improves significantly on previous measurements and is in agreement with theoretical predictions.

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