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−1. The observed structure is consistent with the lowest excited P-wave B+c 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 Bc(1P)+ spectrum, the relative production cross section of the overall Bc(1P)+ states with respect to the (Formula Presented) ground state with the transverse momentum pT and rapidity y of (Formula Presented) mesons in the ffiffi regions pT < 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.

Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). Study of Bc(1P)+ states in the (Formula Presented) mass spectrum. PHYSICAL REVIEW D, 112(11), 1-18 [10.1103/1d49-q8h4].

Study of Bc(1P)+ states in the (Formula Presented) mass spectrum

Anelli A.;Borsato M.;Calvi M.;Capelli S.;Carniti P.;Falcao L. N.;Fazzini D.;Gotti C.;Kirsebom V. S.;Malentacca L.;Martinazzoli L.;Martinelli M.;Minotti A.;Pizzichemi M.;Salomoni M.;
2025

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−1. The observed structure is consistent with the lowest excited P-wave B+c 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 Bc(1P)+ spectrum, the relative production cross section of the overall Bc(1P)+ states with respect to the (Formula Presented) ground state with the transverse momentum pT and rapidity y of (Formula Presented) mesons in the ffiffi regions pT < 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.
Articolo in rivista - Articolo scientifico
Astronomy; Astrophysics; Physics; Particles; Fields
English
3-dic-2025
2025
112
11
1
18
112003
none
Aaij, R., Abdelmotteleb, A., Beteta, C., Abudinen, F., Ackernley, T., Adefisoye, A., et al. (2025). Study of Bc(1P)+ states in the (Formula Presented) mass spectrum. PHYSICAL REVIEW D, 112(11), 1-18 [10.1103/1d49-q8h4].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/609622
Citazioni
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 1
Social impact