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Title: Measurement of properties of Bs0 → μ<sup>+</sup>μ<sup> −</sup> decays and search for B<sup>0</sup> → μ<sup>+</sup>μ<sup> −</sup> with the CMS experiment
Authors: Sirunyan, AM
Tumasyan, A
Adam, W
Ambrogi, F
Bergauer, T
Brandstetter, J
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
Spitzbart, D
Waltenberger, W
Wulz, CE
Zarucki, M
Drugakov, V
Mossolov, V
Suarez Gonzalez, J
Darwish, MR
De Wolf, EA
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, ES
Chhibra, SS
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
Brun, H
Clerbaux, B
De Lentdecker, G
Delannoy, H
Dorney, B
Favart, L
Grebenyuk, A
Kalsi, AK
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, FL
Alves, GA
Correia Silva, G
Hensel, C
Moraes, A
Rebello Teles, P
Belchior Batista Das Chagas, E
Carvalho, W
Issue Date: 28-Apr-2020
Publisher: Springer Verlag
Citation: Journal of High Energy Physics, 2020, 2020 (4)
Abstract: © 2020, The Author(s). Results are reported for the Bs0→ μ+μ− branching fraction and effective lifetime and from a search for the decay B0→ μ+μ−. The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7 TeV (5 fb−1), 8 TeV (20 fb−1), and 13 TeV (36 fb−1). The branching fractions are determined by measuring event yields relative to B+→ J/ψK+ decays (with J/ψ → μ+μ−), which results in the reduction of many of the systematic uncertainties. The decay Bs0→ μ+μ− is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be ℬ(Bs0→μ+μ−)=[2.9±0.7(exp)±0.2(frag)]×10−9, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the Bs0 and the B+ fragmentation functions. No significant excess is observed for the decay B0→ μ+μ−, and an upper limit of ℬ(B0 → μ+μ−) < 3.6 × 10−10 is obtained at 95% confidence level. The Bs0→ μ+μ− effective lifetime is measured to be τμ+μ−=1.70−0.44+0.61 ps. These results are consistent with standard model predictions. [Figure not available: see fulltext.].
ISSN: 1126-6708
Appears in Collections:Dept of Electronic and Electrical Engineering Research Papers

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