Observation of the Λ<inf>b</inf><sup>0</sup>→J/ψΛϕ decay in proton-proton collisions at s=13TeV

Date Issued
10-03-2020
Author(s)
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Flechl, M.
Frühwirth, R.
Jeitler, M.
Krammer, N.
Krätschmer, I.
Liko, D.
Madlener, T.
Mikulec, I.
Rad, N.
Schieck, J.
Schöfbeck, R.
Spanring, M.
Waltenberger, W.
Wulz, C. E.
Zarucki, M.
Drugakov, V.
Mossolov, V.
Suarez Gonzalez, J.
Darwish, M. R.
De Wolf, E. A.
Di Croce, D.
Janssen, X.
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.
Python, Q.
Skovpen, K.
Tavernier, S.
Van Doninck, W.
Van Mulders, P.
Beghin, D.
Bilin, B.
Clerbaux, B.
De Lentdecker, G.
Delannoy, H.
Dorney, B.
Favart, L.
Grebenyuk, A.
Kalsi, A. K.
Popov, A.
Postiau, N.
Starling, E.
Thomas, L.
Vander Velde, C.
Vanlaer, P.
Vannerom, D.
Cornelis, T.
Dobur, D.
Khvastunov, I.
Niedziela, M.
Roskas, C.
Tytgat, M.
Verbeke, W.
Vermassen, B.
Vit, M.
Bondu, O.
Bruno, G.
Caputo, C.
David, P.
Delaere, C.
Delcourt, M.
Giammanco, A.
Lemaitre, V.
Prisciandaro, J.
Saggio, A.
Vidal Marono, M.
Vischia, P.
Zobec, J.
Alves, F. L.
Alves, G. A.
Correia Silva, G.
Hensel, C.
Moraes, A.
Rebello Teles, P.
Belchior Batista Das Chagas, E.
Carvalho, W.
Chinellato, J.
Coelho, E.
Da Costa, E. M.
DOI
Abstract
The observation of the Λb0→J/ψΛϕ decay is reported using proton-proton collision data collected at s=13TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60fb−1. The ratio of the branching fractions B(Λb0→J/ψΛϕ)/B(Λb0→ψ(2S)Λ) is measured to be (8.26±0.90(stat)±0.68(syst)±0.11(B))×10−2, where the first uncertainty is statistical, the second is systematic, and the last uncertainty reflects the uncertainties in the world-average branching fractions of ϕ and ψ(2S) decays to the reconstructed final states.
Volume
802
Subjects