Observation of an Excited Bc± Meson State with the ATLAS Detector

Atlas Collaboration, K. Cranmer, A. Haas, A. I. Mincer, P. Nemethy

Research output: Contribution to journalArticle

Abstract

A search for excited states of the Bc± 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 decay Bc±→J/ψπ±. The state appears in the m(Bc±π+π-)-m(Bc±)-2m(π±) 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 Bc± meson, Bc±(2S).

Original languageEnglish (US)
Article number212004
JournalPhysical Review Letters
Volume113
Issue number21
DOIs
StatePublished - Nov 21 2014

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mesons
detectors
decay
S waves
standard deviation
collisions
ground state
excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Atlas Collaboration, Cranmer, K., Haas, A., Mincer, A. I., & Nemethy, P. (2014). Observation of an Excited Bc± Meson State with the ATLAS Detector. Physical Review Letters, 113(21), [212004]. https://doi.org/10.1103/PhysRevLett.113.212004

Observation of an Excited Bc± Meson State with the ATLAS Detector. / Atlas Collaboration; Cranmer, K.; Haas, A.; Mincer, A. I.; Nemethy, P.

In: Physical Review Letters, Vol. 113, No. 21, 212004, 21.11.2014.

Research output: Contribution to journalArticle

Atlas Collaboration, Cranmer, K, Haas, A, Mincer, AI & Nemethy, P 2014, 'Observation of an Excited Bc± Meson State with the ATLAS Detector', Physical Review Letters, vol. 113, no. 21, 212004. https://doi.org/10.1103/PhysRevLett.113.212004
Atlas Collaboration, Cranmer K, Haas A, Mincer AI, Nemethy P. Observation of an Excited Bc± Meson State with the ATLAS Detector. Physical Review Letters. 2014 Nov 21;113(21). 212004. https://doi.org/10.1103/PhysRevLett.113.212004
Atlas Collaboration ; Cranmer, K. ; Haas, A. ; Mincer, A. I. ; Nemethy, P. / Observation of an Excited Bc± Meson State with the ATLAS Detector. In: Physical Review Letters. 2014 ; Vol. 113, No. 21.
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abstract = "A search for excited states of the Bc± 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 decay Bc±→J/ψπ±. The state appears in the m(Bc±π+π-)-m(Bc±)-2m(π±) 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 Bc± meson, Bc±(2S).",
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AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Agatonovic-Jovin, T.

AU - Aguilar-Saavedra, J. A.

AU - Agustoni, M.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P A

AU - Akimoto, G.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

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