Study of Bc(1P)+ states in the B+cγ mass spectrum



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1154 more authors) (2025) Study of Bc(1P)+ states in the B+cγ mass spectrum PHYSICAL REVIEW D, 112 (11). pp. 1-18. ISSN 2470-0010, 2470-0029

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Abstract

The study of a wide peaking structure in the (Formula Presented) mass spectrum is reported using a data sample of proton-proton collisions collected by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb<sup>−1</sup>. The observed structure is consistent with the lowest excited P-wave B<sup>+</sup> <inf>c</inf> states and exhibits a statistical significance exceeding 7 standard deviations relative to the background-only hypothesis. A two-peak model serves as an effective description of the data, with various theory-constrained models further explored to provide physical interpretation. Based on the predictions for the B<inf>c</inf>(1P)<sup>+</sup> spectrum, the relative production cross section of the overall B<inf>c</inf>(1P)<sup>+</sup> states with respect to the (Formula Presented) ground state with the transverse momentum p<inf>T</inf> and rapidity y of (Formula Presented) mesons in the ffiffi regions p<inf>T</inf> < 20 GeV=c and 2.0 < y < 4.5 at (Formula Presented) is measured to be 0.20 ± 0.03 ± 0.02 ± 0.03, where the uncertainty terms represent statistical, systematic, and uncertainties related to the choice of theoretical models, respectively. The results provide a test of theoretical models and deepen our understanding of quantum chromodynamics.

Item Type: Article
Uncontrolled Keywords: 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User: Symplectic Admin
Date Deposited: 08 Dec 2025 16:15
Last Modified: 16 Jun 2026 07:10
DOI: 10.1103/1d49-q8h4
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/1d49-q8h4
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3195980
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