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Observation of the Bc+ Meson in Pb-Pb and pp Collisions at sNN =5.02 TeV and Measurement of its Nuclear Modification Factor
Journal
Physical Review Letters
ISSN
00319007
Date Issued
2022-06-24
Author(s)
Tumasyan, A.
Adam, W.
Andrejkovic, J. W.
Bergauer, T.
Chatterjee, S.
Dragicevic, M.
Del Valle, A. Escalante
Frühwirth, R.
Jeitler, M.
Krammer, N.
Lechner, L.
Liko, D.
Mikulec, I.
Paulitsch, P.
Pitters, F. M.
Schieck, J.
Schöfbeck, R.
Schwarz, D.
Templ, S.
Waltenberger, W.
Wulz, C. E.
Chekhovsky, V.
Litomin, A.
Makarenko, V.
Darwish, M. R.
De Wolf, E. A.
Janssen, T.
Kello, T.
Lelek, A.
Sfar, H. Rejeb
Van Mechelen, P.
Van Putte, S.
Van Remortel, N.
Blekman, F.
Bols, E. S.
D’Hondt, J.
Delcourt, M.
Faham, H. El
Lowette, S.
Moortgat, S.
Morton, A.
Müller, D.
Sahasransu, A. R.
Tavernier, S.
Van Doninck, W.
Van Mulders, P.
Beghin, D.
Bilin, B.
Clerbaux, B.
De Lentdecker, G.
Favart, L.
Grebenyuk, A.
Kalsi, A. K.
Lee, K.
Mahdavikhorrami, M.
Makarenko, I.
Moureaux, L.
Pétré, L.
Popov, A.
Postiau, N.
Starling, E.
Thomas, L.
Vanden Bemden, M.
Vander Velde, C.
Vanlaer, P.
Wezenbeek, L.
Cornelis, T.
Dobur, D.
Knolle, J.
Lambrecht, L.
Mestdach, G.
Niedziela, M.
Roskas, C.
Samalan, A.
Skovpen, K.
Tytgat, M.
Vermassen, B.
Vit, M.
Benecke, A.
Bethani, A.
Bruno, G.
Bury, F.
Caputo, C.
David, P.
Delaere, C.
Donertas, I. S.
Giammanco, A.
Jaffel, K.
Jain, Sa
Lemaitre, V.
Mondal, K.
Prisciandaro, J.
Taliercio, A.
Teklishyn, M.
Tran, T. T.
Vischia, P.
Wertz, S.
Alves, G. A.
Hensel, C.
Moraes, A.
Abstract
The Bc+ meson is observed for the first time in heavy ion collisions. Data from the CMS detector are used to study the production of the Bc+ meson in lead-lead (Pb-Pb) and proton-proton (pp) collisions at a center-of-mass energy per nucleon pair of sNN=5.02 TeV, via the Bc+→(J/ψ→μ+μ-)μ+νμ decay. The Bc+ nuclear modification factor, derived from the Pb-Pb-to-pp ratio of production cross sections, is measured in two bins of the trimuon transverse momentum and of the Pb-Pb collision centrality. The Bc+ meson is shown to be less suppressed than quarkonia and most of the open heavy-flavor mesons, suggesting that effects of the hot and dense nuclear matter created in heavy ion collisions contribute to its production. This measurement sets forth a promising new probe of the interplay of suppression and enhancement mechanisms in the production of heavy-flavor mesons in the quark-gluon plasma.
Volume
128
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