Journal Article Ppublish 2 citations
PubMed: 42172397 DOI: 10.1103/ctqx-vxrj
First Evidence for Mixing-Induced CP Violation in B_{s}^{0}→J/ψϕ(1020) Decays in pp Collisions at sqrt[s]=13 TeV.
Phys Rev Lett 136(18):181801
Authors: A Hayrapetyan, A Tumasyan, W Adam, J W Andrejkovic, L Benato, T Bergauer, S Chatterjee, K Damanakis, M Dragicevic, P S Hussain, M Jeitler, N Krammer, A Li, D Liko, I Mikulec, J Schieck, R Schöfbeck, D Schwarz, M Sonawane, W Waltenberger, C-E Wulz, T Janssen, T Van Laer, P Van Mechelen, N Breugelmans, J D'Hondt, S Dansana, A De Moor, M Delcourt, F Heyen, S Lowette, I Makarenko, D Müller, S Tavernier, M Tytgat, G P Van Onsem, S Van Putte, D Vannerom, B Bilin, B Clerbaux, A K Das, I De Bruyn, G De Lentdecker, H Evard, L Favart, P Gianneios, J Jaramillo, A Khalilzadeh, F A Khan, K Lee … and 2345 other authors
Affiliations
- Yerevan Physics Institute, Yerevan, Armenia.
- Institut für Hochenergiephysik, Vienna, Austria.
- Universiteit Antwerpen, Antwerpen, Belgium.
- Vrije Universiteit Brussel, Brussel, Belgium.
- Université Libre de Bruxelles, Bruxelles, Belgium.
Abstract
A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27 500 tagged B_{s}^{0}→J/ψϕ(1020) decays from pp collisions at sqrt[s]=13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 96.5 fb^{-1}. A time- and flavor-dependent angular analysis of the μ^{+}μ^{-}K^{+}K^{-} final state, consistent with a ϕ(1020)→K^{+}K^{-} decay, is used to measure parameters of the B_{s}^{0}-B[over ¯]_{s}^{0} system. The weak phase is measured to be ϕ_{s}=-73±22(stat)±10(syst) mrad, which, combined with the sqrt[s]=8 TeV CMS result, gives ϕ_{s}=-75±23 mrad. This value differs from zero by 3.2 standard deviations, providing the first evidence for mixing-induced CP violation in B_{s}^{0}→J/ψϕ(1020) decays. All measured physics parameters are found to agree with standard model predictions where available.
MeSH
Physics