Evidence for an η<inf>c</inf>(1 S) π<sup>-</sup> resonance in B<sup>0</sup>→ η<inf>c</inf>(1 S) K<sup>+</sup>π<sup>-</sup> decays



Aaij, R, Beteta, CA, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 87 more authors) (2018) Evidence for an η<inf>c</inf>(1 S) π<sup>-</sup> resonance in B<sup>0</sup>→ η<inf>c</inf>(1 S) K<sup>+</sup>π<sup>-</sup> decays. European Physical Journal C, 78 (12).

Access the full-text of this item by clicking on the Open Access link.

Abstract

© 2018, CERN for the benefit of the LHCb collaboration. A Dalitz plot analysis of B0→ηc(1S)K+π- decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of s=7,8 and 13TeV, corresponding to a total integrated luminosity of 4.7fb-1. A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(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+18MeV and 152±58-35+60MeV, respectively. The spin-parity assignments JP= 0 + and JP= 1 - are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π- branching fraction is performed and gives B(B0→ηc(1S)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
Depositing User: Symplectic Admin
Date Deposited: 11 Feb 2019 15:35
Last Modified: 24 Nov 2020 08:24
DOI: 10.1140/epjc/s10052-018-6447-z
Open Access URL: https://doi.org/10.1140/epjc/s10052-018-6447-z
URI: http://livrepository.liverpool.ac.uk/id/eprint/3032668