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Title: | Measurement of the CP-violating phase ϕ<inf>s</inf> in the B<inf>s</inf><sup>0</sup> → J/ψϕ(1020) → μ<sup>+</sup>μ<sup>−</sup>K<sup>+</sup>K<sup>−</sup> channel in proton-proton collisions at s = 13 TeV |
Other Titles: | Measurement of the C P -violating phase φs in the Bs → J/ψ φ(1020) → μ+μ-K+K- channel in proton-proton collisions at s = 13 TeV |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Bergauer, T Dragicevic, M Erö, J Escalante Del Valle, A Frühwirth, R Jeitler, M Krammer, N Mondal, K Prisciandaro, J Taliercio, A Khan, A Teklishyn, M Vischia, P Hobson, PR Wuyckens, S Cole, JE The CMS Collaboration Lechner, L Liko, D Madlener, T Mikulec, I Pitters, FM Rad, N Schieck, J Schöfbeck, R Spanring, M Templ, S Waltenberger, W Wulz, CE Zarucki, M Chekhovsky, V Litomin, A Makarenko, V Suarez Gonzalez, J Darwish, MR De Wolf, EA Di Croce, D Janssen, X Kello, T 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 Morton, A Python, Q 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, AK Makarenko, I Moureaux, L Pétré, L Popov, A Postiau, N Starling, E Thomas, L Vander Velde, C Vanlaer, P Zahid, S Vannerom, D Wezenbeek, L Cornelis, T Dobur, D Gruchala, M Khvastunov, I Niedziela, M Teodorescu, L Roskas, C Skovpen, K Tytgat, M Verbeke, W Vermassen, B Vit, M Reid, ID Bruno, G Bury, F Caputo, C David, P Delaere, C Mackay, CK Delcourt, M Donertas, IS Giammanco, A Lemaitre, V Kyberd, P |
Keywords: | CMS;physics;oscillations;B physics |
Issue Date: | 3-Mar-2021 |
Publisher: | Elsevier BV |
Citation: | The CMS Collaboration (2021) 'Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2021, 816, 136188, pp. 1-27. doi: 10.1016/j.physletb.2021.136188. |
Abstract: | © 2021 The Author(s). The CP -violating weak phase ϕ and the decay width difference ΔΓ between the light and heavy B mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed B →J/ψϕ(1020)→μ μ K K events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb , collected in proton-proton collisions at s=13TeV in 2017–2018. To extract the values of ϕ and ΔΓ , a time-dependent and flavor-tagged angular analysis of the μ μ K K final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕ =−11±50(stat)±10(syst)mrad and ΔΓ =0.114±0.014(stat)±0.007(syst)ps , in agreement with the standard model predictions. When combined with the previous CMS measurement at s=8TeV, the following values are obtained: ϕ =−21±44(stat)±10(syst)mrad, ΔΓ =0.1032±0.0095(stat)±0.0048(syst)ps , a significant improvement over the 8 TeV result. |
URI: | https://bura.brunel.ac.uk/handle/2438/22674 |
DOI: | https://doi.org/10.1016/j.physletb.2021.136188 |
ISSN: | 0370-2693 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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