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Observation of B<inf>s</inf><sup>0</sup> mesons and measurement of the B<inf>s</inf><sup>0</sup>/B<sup>+</sup> yield ratio in PbPb collisions at [Formula presented] TeV
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN
03702693
Date Issued
2022-06-10
Author(s)
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Frühwirth, R.
Jeitler, M.
Krammer, N.
Lechner, L.
Liko, D.
Madlener, T.
Mikulec, I.
Pitters, F. M.
Rad, N.
Schieck, J.
Schöfbeck, R.
Spanring, M.
Templ, S.
Waltenberger, W.
Wulz, C. E.
Zarucki, M.
Chekhovsky, V.
Litomin, A.
Makarenko, V.
Suarez Gonzalez, J.
Darwish, M. R.
De Wolf, E. A.
Di Croce, D.
Janssen, X.
Kello, T.
Lelek, A.
Pieters, M.
Rejeb Sfar, H.
Van Haevermaet, H.
Van Mechelen, P.
Van Putte, S.
Van Remortel, N.
Blekman, F.
Bols, E. S.
Chhibra, S. S.
D’Hondt, J.
De Clercq, J.
Lontkovskyi, D.
Lowette, S.
Marchesini, I.
Moortgat, S.
Morton, A.
Python, Q.
Tavernier, S.
Van Doninck, W.
Van Mulders, P.
Beghin, D.
Bilin, B.
Clerbaux, B.
De Lentdecker, G.
Dorney, B.
Favart, L.
Grebenyuk, A.
Kalsi, A. K.
Makarenko, I.
Moureaux, L.
Pétré, L.
Popov, A.
Postiau, N.
Starling, E.
Thomas, L.
Vander Velde, C.
Vanlaer, P.
Vannerom, D.
Wezenbeek, L.
Cornelis, T.
Dobur, D.
Gruchala, M.
Khvastunov, I.
Niedziela, M.
Roskas, C.
Skovpen, K.
Tytgat, M.
Verbeke, W.
Vermassen, B.
Vit, M.
Bruno, G.
Bury, F.
Caputo, C.
David, P.
Delaere, C.
Delcourt, M.
Donertas, I. S.
Giammanco, A.
Lemaitre, V.
Mondal, K.
Prisciandaro, J.
Taliercio, A.
Teklishyn, M.
Vischia, P.
Wuyckens, S.
Zobec, J.
Vetens, W.
Abstract
The Bs0 and B+ production yields are measured in PbPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data sample, collected with the CMS detector at the LHC, corresponds to an integrated luminosity of 1.7 nb−1. The mesons are reconstructed in the exclusive decay channels B→s0J/ψ(μ+μ−)ϕ(K+K−) and B→+J/ψ(μ+μ−)K+, in the transverse momentum range 7–50 GeV/c and absolute rapidity 0–2.4. The Bs0 meson is observed with a statistical significance in excess of five standard deviations for the first time in nucleus-nucleus collisions. The measurements are performed as functions of the transverse momentum of the B mesons and of the PbPb collision centrality. The ratio of production yields of Bs0 and B+ is measured and compared to theoretical models that include quark recombination effects.
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