A structure is observed in the B± K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb^−1. The structure is interpreted as the result of overlapping excited B0s states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B± K∓, are determined to be m_1 = 6063.5 ± 1.2(stat) ± 0.8(syst) MeV, Γ_1 = 26 ± 4(stat) ± 4(syst) MeV, m_2 =6114 ± 3(stat) ± 5(syst) MeV, Γ_2 = 66 ± 18(stat) ± 21(syst) MeV. Alternative values assuming a decay through B*± K∓, with a missing photon from the B*± → B± γ decay, which are shifted by approximately 45 MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2*0 state is determined to be 0.87 ± 0.15(stat) ± 0.19(syst).

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of New Excited B0s States. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(7), 1-11 [10.1140/epjc/s10052-021-09305-3].

Observation of New Excited B0s States

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Zucchelli, S.;
2021

Abstract

A structure is observed in the B± K∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb^−1. The structure is interpreted as the result of overlapping excited B0s states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B± K∓, are determined to be m_1 = 6063.5 ± 1.2(stat) ± 0.8(syst) MeV, Γ_1 = 26 ± 4(stat) ± 4(syst) MeV, m_2 =6114 ± 3(stat) ± 5(syst) MeV, Γ_2 = 66 ± 18(stat) ± 21(syst) MeV. Alternative values assuming a decay through B*± K∓, with a missing photon from the B*± → B± γ decay, which are shifted by approximately 45 MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed Bs2*0 state is determined to be 0.87 ± 0.15(stat) ± 0.19(syst).
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of New Excited B0s States. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 81(7), 1-11 [10.1140/epjc/s10052-021-09305-3].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/849047
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