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Observation of an Excited B-c(+/-) Meson State with the ATLAS Detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 21, 212004- p.Article in journal (Refereed) Published
Abstract [en]

A search for excited states of the B-c(+/-) meson is performed using 4.9 fb(-1) of 7 TeV and 19.2 fb(-1) of 8 TeV pp collision data collected by the ATLAS experiment at the LHC. A new state is observed through its hadronic transition to the ground state, with the latter detected in the decayB(c)(+/-) -> J/psi pi(+/-). The state appears in the m(B-c(+/-)pi(+)pi(-)) - m(B-c(+/-)) - 2m(pi(+/-)) mass difference distribution with a significance of 5.2 standard deviations. The mass of the observed state is 6842 +/- 4 +/- 5 MeV, where the first error is statistical and the second is systematic. The mass and decay of this state are consistent with expectations for the second S-wave state of the B-c(+/-) meson, B-c(+/-)(2S).

Place, publisher, year, edition, pages
2014. Vol. 113, no 21, 212004- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-241567DOI: 10.1103/PhysRevLett.113.212004ISI: 000345745800002OAI: oai:DiVA.org:uu-241567DiVA: diva2:779866
Note

ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevLett.113.212004

Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05Bibliographically approved

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Brenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, DanielRangel Smith, Camila

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Brenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, DanielRangel Smith, Camila
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High Energy PhysicsDepartment of Physics and Astronomy
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