%0 Journal Article
%T Observation of new excited Bs0 states
%A LHCb Collaboration (Aaij, R. et al
%A Henry, L.
%A Jashal, B. K.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Vidal, J.
%A Sanchez Mayordomo, C.
%J European Physical Journal C
%D 2021
%V 81
%N 7
%I Springer
%@ 1434-6044
%G English
%F LHCbCollaborationAaij_etal2021
%O WOS:000691564500002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4957), last updated on Mon, 13 Sep 2021 13:47:12 +0000
%X 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 Bs0</mml:msubsup> 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 m1 = 6063.5 +/- 1.2 (stat) +/- 0.8 (syst) MeVGamma 1 = 26 +/- 4 (stat) +/- 4 (syst) MeVm2 = 6114 +/- 3 (stat) +/- 5 (syst) MeVGamma 2 = 66 +/- 18 (stat) +/- 21 (syst) MeVAlternative values assuming a decay through B +/- K -/+, with a missing photon from the B +/- -> B +/- gamma 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 Bs20 state is determined to be 0.87 +/- 0.15 (stat)+/- 0.19 (syst).
%R 10.1140/epjc/s10052-021-09305-3
%U https://arxiv.org/abs/2010.15931
%U https://doi.org/10.1140/epjc/s10052-021-09305-3
%P 601 - 11pp