Study of $B_c(1P)^+$ states in the $B_c^+ \gamma$ mass spectrum
Year: 2025
Type: article
Abstract: The study of a wide peaking structure in the B c + γ 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 B c ( 1 P ) + spectrum, the relative production cross section of the overall B c ( 1 P ) + states with respect to the B c + ground state with the transverse momentum p T and rapidity y of B c + mesons in the regions p T < 20 GeV / c and 2.0 < y < 4.5 at s = 13 TeV 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.
DOI: 10.5167/uzh-282992
Authors: Aaij, R., Abdelmotteleb, A. S. W., 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., LHCb Collaboration, et al
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7124707997
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