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Title: Search for rare decays of Z and Higgs bosons to J / ψ and a photon in proton-proton collisions at √s = 13 TeV
Authors: Sirunyan, AM
Tumasyan, A
Adam, W
Ambrogi, F
Asilar, E
Bergauer, T
Brandstetter, J
Dragicevic, M
Erö, J
Del Valle, AE
Flechl, M
Frühwirth, R
Ghete, VM
Hrubec, J
Jeitler, M
Krammer, N
Krätschmer, I
Liko, D
Madlener, T
Mikulec, I
Rad, N
Rohringer, H
Schieck, J
Schöfbeck, R
Spanring, M
Spitzbart, D
Taurok, A
Waltenberger, W
Wittmann, J
Wulz, CE
Zarucki, M
Chekhovsky, V
Mossolov, V
Gonzalez, JS
De Wolf, EA
Di Croce, D
Janssen, X
Lauwers, J
Pieters, M
Van Haevermaet, H
Van Mechelen, P
Van Remortel, N
Zeid, SA
Blekman, F
D Hondt, J
De Bruyn, I
De Clercq, J
Deroover, K
Flouris, G
Lontkovskyi, D
Lowette, S
Marchesini, I
Moortgat, S
Moreels, L
Python, Q
Skovpen, K
Tavernier, S
Van Doninck, W
Van Mulders, P
Van Parijs, I
Beghin, D
Bilin, B
Brun, H
Clerbaux, B
De Lentdecker, G
Delannoy, H
Dorney, B
Fasanella, G
Favart, L
Goldouzian, R
Grebenyuk, A
Kalsi, AK
Lenzi, T
Luetic, J
Postiau, N
Starling, E
Thomas, L
Velde, CV
Vanlaer, P
Vannerom, D
Wang, Q
Cornelis, T
Dobur, D
Fagot, A
Gul, M
Khvastunov, I
Poyraz, D
Roskas, C
Trocino, D
Tytgat, M
Verbeke, W
Vermassen, B
Vit, M
Zaganidis, N
Bakhshiansohi, H
Bondu, O
Brochet, S
Bruno, G
Caputo, C
David, P
Keywords: pp collisions;Parton distributions;mass
Issue Date: Jan-2019
Publisher: Springer
Citation: European Physical Journal C, 2019, 79 (2)
Abstract: A search is presented for decays of Z and Higgs bosons to a J / ψ meson and a photon, with the subsequent decay of the J / ψ to μ+μ-. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9fb-1 at s=13TeV collected with the CMS detector at the LHC. The observed limit on the Z → J / ψγ decay branching fraction, assuming that the J / ψ meson is produced unpolarized, is 1.4 × 10 - 6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from - 13.6 to + 8.6 % with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J / ψγ where the J / ψ meson is assumed to be transversely polarized is 7.6 × 10 - 4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at s=8TeV to produce an observed upper limit on the branching fraction for H → J / ψγ that is a factor of 220 larger than the standard model value.
Description: © 2019, CERN for the benefit of the CMS collaboration.
ISSN: 1434-6052
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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