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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. [The LHCb Collaboration]
Study of Bc(1P)⁺ states in the B⁺cγ mass spectrum / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 112:11(2025 Dec 03), pp. 112003.1-112003.18. [10.1103/1d49-q8h4]
Study of Bc(1P)⁺ states in the B⁺cγ mass spectrum
Aaij, R.
Primo
;Abdelmotteleb, A. S. W.
Secondo
;Abellan Beteta, C.;Abudinén, F.;Ackernley, T.;Adefisoye, A. A.;Adeva, B.;Adinolfi, M.;Adlarson, P.;Agapopoulou, C.;Aidala, C. A.;Ajaltouni, Z.;Akar, S.;Akiba, K.;Albicocco, P.;Albrecht, J.;Alessio, F.;Aliouche, Z.;Alvarez Cartelle, P.;Amalric, R.;Amato, S.;Amey, J. L.;Amhis, Y.;An, L.;Anderlini, L.;Andersson, M.;Andreola, P.;Andreotti, M.;Andres Estrada, S.;Anelli, A.;Ao, D.;Archilli, F.;Areg, Z;Argenton, M.;Arguedas Cuendis, S.;Artamonov, A.;Artuso, M.;Aslanides, E.;Ataíde Da Silva, R.;Atzeni, M.;Audurier, B.;Authier, J. A.;Bacher, D.;Bachiller Perea, I.;Bachmann, S.;Bachmayer, M.;Back, J. J.;Baladron Rodriguez, P.;Balagura, V.;Balboni, A.;Baldini, W.;Balzani, L.;Bao, H.;Baptista de Souza Leite, J.;Barbero Pretel, C.;Barbetti, M.;Barbosa, I. R.;Barlow, R. J.;Barnyakov, M.;Barsuk, S.;Barter, W.;Bartz, J.;Bashir, S.;Batsukh, B.;Battista, P. B.;Bay, A.;Beck, A.;Becker, M.;Bedeschi, F.;Bediaga, I. B.;Behling, N. 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Penultimo
;Zunica, G.
Ultimo
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. [The LHCb Collaboration]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1252103
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