Evidence for an nc(1S)ff- resonance in B0 yc(1S)K+ decays



Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 836 more authors) (2018) Evidence for an nc(1S)ff- resonance in B0 yc(1S)K+ decays. EUROPEAN PHYSICAL JOURNAL C, 78 (12). 1019-.

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Abstract

A Dalitz plot analysis of B 0 → η c ( 1 S ) K + π - decays is performed using data samples of <i>pp</i> collisions collected with the LHCb detector at centre-of-mass energies of s = 7 , 8 and 13 Te V , 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 c ( 1 S ) π - resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096 ± 20 - 22 + 18 Me V and 152 ± 58 - 35 + 60 Me V , 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 B 0 → η c ( 1 S ) K + π - branching fraction is performed and gives B ( B 0 → η c ( 1 S ) K + π - ) = ( 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.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-034.html
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 21 Feb 2019 08:29
Last Modified: 30 Jan 2024 08:23
DOI: 10.1140/epjc/s10052-018-6447-z
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3033198