Measurement of the ratio of the B$_c^+$ → J / ψ τ$^+$ ν$_τ$ and B$_c^+$ → J / ψ μ$^+$ ν$_μ$ branching fractions using three-prong τ lepton decays
The ratio between the 𝐵$^+_𝑐$→𝐽/𝜓𝜏$^+$𝜈$_𝜏$ and 𝐵$^+_𝑐$→𝐽/𝜓𝜇$^+$𝜈$_𝜇$ branching fractions is measured using a data sample of proton-proton collisions collected by CMS at a center-of-mass energy of 13 TeV in the years 2016–2018 and corresponding to an integrated luminosity of 138 fb$^{−1}$. The 𝐽/𝜓 meson is identified through its 𝐽/𝜓 →𝜇$^+$𝜇$^−$ decay and the tau lepton is reconstructed in the hadronic three-prong final state. The measured ratio of branching fractions in this tau decay mode, ℛ$^{had}_{𝐽/𝜓}$ =1.04$^{+0.50}_{−0.44}$, is combined with the previous analysis based on the 𝜏$^+$→𝜇$^+$𝜈$_𝜇$$\overline{𝜈}$$_𝜏$ leptonic decay channel, leading to ℛ$_{𝐽/𝜓}$ =0.49±0.26. As this result is consistent with the standard model prediction of 0.258 ±0.004, no evidence of lepton flavor universality violation is found.
Authors
- C. Hensel
- S a. Jain
- J. Song
- M. De Coen
- C.-E. Wulz
- S. Bein
- M. Delcourt
- G. A. Alves
- J. Lidrych
- V. Lemaitre
- D. Schwarz
- F. Heyen
- S. Turkcapar
- W. L. Aldá Júnior
- G. Gokbulut
- N. Van Den Bossche
- L. Thomas
- M. Vanden Bemden
- C. Vander Velde
- D. Dobur
- C. Mora Herrera
- D. Marckx
- A. Tumasyan
- P. S. Hussain
- T. Van Laer
- J. Knolle
- J. Schieck
- L. Lambrecht
- CMS Collaboration
- D. Vannerom
- Y. Hong
- F. Zhang
- M. Dragicevic
- G. P. Van Onsem
- J. Bierkens
- I. Makarenko
- A. Giammanco
- H. Evard
- J. De Favereau De Jeneret
- P. Mastrapasqua
- M. Jeitler
- S. Tavernier
- A. Vilela Pereira
- P. Gianneios
- G. Correia Silva
- M. Shooshtari
- A. Cappati
- J. Vandenbroeck
- A. Benecke
- G. Bruno
- A. J. Li
- C. Delaere
- N. Krammer
- D. Liko
- S. Lowette
- S. Van Putte
- L. Favart
- W. Waltenberger
- I. Mikulec
- N. Breugelmans
- E. Coelho
- J. D’Hondt
- M. Barroso Ferreira Filho
- M. A. Shahzad
- R. Schöfbeck
- A. K. Das
- H. Kwon
- S. Dansana
- B. Bilin
- M. Sonawane
- A. Khalilzadeh
- I. De Bruyn
- A. O. Guzel
- P. Van Mechelen
- J. van der Linden
- T. Menezes De Oliveira
- A. Hayrapetyan
- G. De Lentdecker
- V. Chekhovsky
- P. Vanlaer
- T. Bergauer
- A. Bethani
- K. Damanakis
- T. Janssen
- J. W. Andrejkovic
- L. Wezenbeek
- P. Rebello Teles
- F. A. Khan
- E. J. Tonelli Manganote
- W. Adam
- A. Malara
- L. Benato
- A. De Moor
- V. Makarenko
- K. Skovpen
- M. Soeiro
- M. Tytgat
- C. Giordano
- D. Müller
- B. Clerbaux
Publication Details
- Journal
- KITopen
- Published
- 2026-07-16
- DOI
- https://doi.org/10.5445/ir/1000195281
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00