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Measurement of the phase between strong and electromagnetic amplitudes of J/Psi decays
Institute of High Energy Physics, Beijing 100049, People’s Republic of China.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0002-6945-716x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0003-4937-2270
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Number of Authors: 4462019 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 791, p. 375-384Article in journal (Refereed) Published
Abstract [en]

Using 16 energy points of e(+) e(-) annihilation data collected in the vicinity of the J/Psi resonance with the BESIII detector and with a total integrated luminosity of around 100 pb(-1), we study the relative phase between the strong and electromagnetic amplitudes of J/Psi decays. The relative phase between J/Psi electromagnetic decay and the continuum process (e(+) e(-) annihilation without the J/Psi resonance) is confirmed to be zero by studying the cross section lineshape of mu(+) mu(-) production. The relative phase between J/Psi strong and electromagnetic decays is then measured to be (84.9 +/- 3.6)degrees or (-84.7 +/- 3.1)degrees for the 2(pi(+) pi(-) )pi(0) final state by investigating the interference pattern between the J/Psi decay and the continuum process. This is the first measurement of the relative phase between J/Psi strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state eta pi(+) pi(-) with eta -> pi(+) pi(-) pi(0) , which provides additional information about the phase between the J/Psi electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of J/Psi -> 2(pi(+) pi(-) )pi(0) is measured to be (4.73 +/- 0.44)% or (4.85 +/- 0.45)%, and the branching fraction of J/Psi -> eta pi(+) pi(-) is measured to be (3.78 +/- 0.68) x 10(-4). Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics.

Place, publisher, year, edition, pages
2019. Vol. 791, p. 375-384
Keywords [en]
Phase, Strong amplitude, Electromagnetic amplitude, J/Psi decay, BESIII
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-382250DOI: 10.1016/j.physletb.2019.03.001ISI: 000462321800054OAI: oai:DiVA.org:uu-382250DiVA, id: diva2:1313555
Funder
Swedish Research Council
Note

For complete list of authors see http://dx.doi.org/10.1016/j.physletb.2019.03.001

Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-05-03Bibliographically approved

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Andersson, Walter IkegamiJohansson, TordKupsc, AndrzejPapenbrock, MichaelPettersson, JoachimSchönning, KarinWolke, Magnus
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