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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 √<i>s</i> = 13 TeV |
Other Titles: | Search for rare decays of Z and Higgs bosons to J / ψ and a photon in proton-proton collisions at $$ \sqrt{s} $$ = 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 Vannerom, D Wang, Q Cornelis, T Dobur, D Fagot, A Gul, M Reid, ID Khvastunov, I Poyraz, D Roskas, C Trocino, D Tytgat, M Morton, A Verbeke, W Vermassen, B Vit, M Zaganidis, N Mackay, CK Bakhshiansohi, H Bondu, O Brochet, S Kyberd, P Bruno, G Caputo, C Khan, A David, P Hobson, PR Cole, JE 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 Zahid, S Lenzi, T Luetic, J Postiau, N Starling, E Thomas, L Velde, CV Vanlaer, P Teodorescu, L |
Keywords: | pp collisions;Parton distributions;mass |
Issue Date: | 1-Feb-2019 |
Publisher: | Springer |
Citation: | Sirunyan, A.M., Tumasyan, A. et al. for the benefit of the CMS Collaboration (2019) 'Search for rare decays of Z and Higgs bosons to J / ψ and a photon in proton-proton collisions at √<i>s</i> = 13 TeV', European Physical Journal C, 79 (2), 94, pp. 1 - 27. doi: 10.1140/epjc/s10052-019-6562-5. |
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. |
URI: | https://bura.brunel.ac.uk/handle/2438/17578 |
DOI: | https://doi.org/10.1140/epjc/s10052-019-6562-5 |
ISSN: | 1434-6044 |
Other Identifiers: | ORCiD: A. Tumasyan https://orcid.org/0009-0000-0684-6742 ORCiD: Joanne E. Cole https://orcid.org/0000-0001-5638-7599 ORCiD: Akram Khan https://orcid.org/0000-0002-4597-4402 ORCiD: Paul Kyberd https://orcid.org/0000-0002-7353-7090 ORCiD: Ivan D. Reid https://orcid.org/0000-0002-9235-779X ORCiD: Liliana Teodorescu https://orcid.org/0000-0002-6974-6201 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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