Test of lepton flavor universality in semileptonic B meson decays in proton-proton collisions at = 13 TeV

(CMS Collaboration) Hayrapetyan, Aram ; ... ; Giljanović, Duje ; Godinović, Nikola ; Lelas, Damir ; Šćulac, Ana ; Kovač, Marko ; Petković, Andro ; Šćulac, Toni ; Bargassa, Pedrame ; Brigljević, Vuko ; Chitroda, Bhakti Kanulal ; Ferenček, Dinko ; Jakovčić, Krešimir ; Mishra, Saswat ; Starodumov, Andrey ; Šuša, Tatjana ; ... ; Roguljić, Matej ; ... ; Makarenko, Vladimir (2025) Test of lepton flavor universality in semileptonic B meson decays in proton-proton collisions at = 13 TeV. Physical Review D, 111 (5). ISSN 2470-0010

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Abstract

A measurement of the ratio of branching fractions (J/) = (B J/) / (B J/) in the J/ , decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2018, corresponding to an integrated luminosity of 59.7 fb. The measured ratio, (J/) = 0.17 (stat) (syst) (theo) = 0.17 0.33, agrees with the value of 0.2582 0.0038 predicted by the standard model, which assumes lepton flavor universality. By testing lepton flavor universality, this measurement is a probe of new physics using B mesons, which are currently only produced at the LHC.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Centre for detectors, sensors and electronics Division of Experimental Physics
Depositing User:	Ema Buhin Šaler
Date Deposited:	22 Jan 2026 15:26
URI:	http://fulir.irb.hr/id/eprint/11075
DOI:	10.1103/PhysRevD.111.L051102

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