Observation of an Excited B[± over c] Meson State with the ATLAS Detector
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Author(s)
Taylor, Frank E.
Date Issued
November 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Observation of an Excited B[superscript ± subscript c] Meson State with the ATLAS Detector” Physical Review Letters 113, no. 21 (November 2014). © 2014 CERN, for the ATLAS Collaboration
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Final published version
Abstract
A search for excited states of the B[± over c] meson is performed using 4.9 fb[superscript −1] of 7 TeV and 19.2 fb[superscript −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[± over c] → J/ψπ[superscript ±]. The state appears in the m(B[± over c]π[superscript +]π[superscript −]) − m(B[± over c]) − 2m(π[superscript ±]) 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[± over c] meson, B[± over c](2S).
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.212004
