Observation of an Excited B_c ^{±} Meson State with the ATLAS Detector

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Observation of an Excited B_c ^{±} Meson State with the ATLAS Detector

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Title: Observation of an Excited B_c ^{±} Meson State with the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdel Khalek, S.;
Abdinov, O.;
Aben, R.;
Abi, B.;
Izen, Joseph M.;
Leyton, Michael;
Lou, Xinchou;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Format: Text
Item Type: Article
Keywords: B mesons
Unbinned maximum likelihood
Proton-proton interactions
Abstract: A search for excited states of theB(±)(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 decay B(±)(c) → J/ψπ±. The state appears in the m(B(±)(c)π⁺π⁻) − mB(±)(c) 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).
Publisher: American Physical Society
ISSN: 1079-7114
Persistent Link: http://hdl.handle.net/10735.1/3079
http://dx.doi.org/10.1103/PhysRevD.85.011101
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, et al. 2014. "Observation of an excited B(±)(c) meson state with the ATLAS detector." Physical Review Letters 113(21): 212004.
Terms of Use: CC-BY 3.0 (Attribution)
©2014 CERN for the ATLAS Collaboration

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CC-BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC-BY 3.0 (Attribution)