Evidence for an ηc(1s)π- resonance in B⁰→ηc(1S)K+π- decays
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10052_2018_Article_6447.pdf
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Author(s)
Aaij, R.
Beteta, C. A
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alternative Title
Evidence for an η[subscript c](1s)π[superscript -] resonance in B⁰→η[subscript c](1S)K[superscript +]π[superscript -] decays
Date Issued
December 2018
Journal
European physical journal C
Publisher
Springer Berlin Heidelberg
Citation
LHCb Collaboration (Aaij, R., et al.), "Evidence for an ηc(1s)π- resonance in B⁰→ηc(1S)K+π- decays." European physical journal C 78, 78 (2018):
Version
Final published version
Abstract
A Dalitz plot analysis of B⁰ → η[subscript c](1S)K[superscript +]π[superscript −] decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s = 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 4.7 fb−¹. A satisfactory description of the data is obtained when including a contribution representing an exotic η[subscript c](1S)π[superscript −] resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096 ± 20 +18 −22 MeV and 152±58 +60 −35 MeV, respectively. The spin-parity assignments J P = 0+ and J P = 1− are both consistent with the data. In addition, the first measurement of the B0 → η[subscript c](1S)K[superscript +]π[superscript −] branching fraction is performed and gives B(B⁰→ η[subscript c](1S)K[superscript +]π[superscript -]) = (5.73 ± 0.24 ± 0.13 ± 0.66) × 10−4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions. ©2018 Author(s)
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
10.1140/epjc/s10052-018-6447-z
