Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays

The LHCb Collaboration; W. Barter; F. Betti; A. Bohare; E. Buchanan; P. E. L. Clarke; Robert Currie; S. Eisenhardt; K. Farmer; S. Gambetta; M. Kane; Y. Liu; F. Muheim; M. Needham; F. Oliva; R.H. O'Neil; O. Ozcelik; M. Richardson-Slipper; G. Sarpis; L. Soares Lavra; B. Urbach; C. Vrahas; M. R. J. Williams

doi:10.1103/PhysRevLett.134.121803

Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays

The LHCb Collaboration
, W. Barter
, F. Betti
, A. Bohare
, E. Buchanan
, P. E. L. Clarke
, Robert Currie
, S. Eisenhardt
, K. Farmer
, S. Gambetta
, M. Kane
, Y. Liu
, F. Muheim
, M. Needham
, F. Oliva
, R.H. O'Neil
, O. Ozcelik
, M. Richardson-Slipper
, G. Sarpis
, L. Soares Lavra

B. Urbach, C. Vrahas, M. R. J. Williams

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

Lepton flavor universality in rare b→s transitions is tested for the first time using Bs0 meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb-1. Branching fraction ratios between the Bs0→ϕe+e- and Bs0→ϕμ+μ- decays are measured in three regions of dilepton mass squared, q2, with 0.1<q2<1.1, 1.1<q2<6.0, and 15<q2<19 GeV2/c4. The results agree with the standard model expectation of lepton flavor universality.

Original language	English
Article number	121803
Pages (from-to)	1-15
Number of pages	15
Journal	Physical Review Letters
Volume	134
Issue number	12
Early online date	27 Mar 2025
DOIs	https://doi.org/10.1103/PhysRevLett.134.121803
Publication status	Published - 28 Mar 2025

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10.1103/PhysRevLett.134.121803Licence: Creative Commons: Attribution (CC-BY)

3 Active
4 Finished

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 30/09/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 30/09/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 11/08/27
Project: Research

Cite this

The LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Buchanan, E., Clarke, P. E. L., Currie, R., Eisenhardt, S., Farmer, K., Gambetta, S., Kane, M., Liu, Y., Muheim, F., Needham, M., Oliva, F., O'Neil, R. H., Ozcelik, O., Richardson-Slipper, M., Sarpis, G., ... Williams, M. R. J. (2025). Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays. Physical Review Letters, 134(12), 1-15. Article 121803. https://doi.org/10.1103/PhysRevLett.134.121803

@article{f3b3fae332d64a4288a5d8b4d9a65cd2,

title = "Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays",

abstract = "Lepton flavor universality in rare b→s transitions is tested for the first time using Bs0 meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb-1. Branching fraction ratios between the Bs0→ϕe+e- and Bs0→ϕμ+μ- decays are measured in three regions of dilepton mass squared, q2, with 0.1",

author = "\{The LHCb Collaboration\} and W. Barter and F. Betti and A. Bohare and E. Buchanan and Clarke, \{P. E. L.\} and Robert Currie and S. Eisenhardt and K. Farmer and S. Gambetta and M. Kane and Y. Liu and F. Muheim and M. Needham and F. Oliva and R.H. O'Neil and O. Ozcelik and M. Richardson-Slipper and G. Sarpis and Lavra, \{L. Soares\} and B. Urbach and C. Vrahas and Williams, \{M. R. J.\}",

year = "2025",

month = mar,

day = "28",

doi = "10.1103/PhysRevLett.134.121803",

language = "English",

volume = "134",

pages = "1--15",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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The LHCb Collaboration, Barter, W, Betti, F, Bohare, A, Buchanan, E , Clarke, PEL , Currie, R , Eisenhardt, S, Farmer, K, Gambetta, S , Kane, M, Liu, Y, Muheim, F , Needham, M , Oliva, F, O'Neil, RH, Ozcelik, O, Richardson-Slipper, M, Sarpis, G, Lavra, LS, Urbach, B, Vrahas, C & Williams, MRJ 2025, 'Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays', Physical Review Letters, vol. 134, no. 12, 121803, pp. 1-15. https://doi.org/10.1103/PhysRevLett.134.121803

TY - JOUR

T1 - Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays

AU - The LHCb Collaboration

AU - Barter, W.

AU - Betti, F.

AU - Bohare, A.

AU - Buchanan, E.

AU - Clarke, P. E. L.

AU - Currie, Robert

AU - Eisenhardt, S.

AU - Farmer, K.

AU - Gambetta, S.

AU - Kane, M.

AU - Liu, Y.

AU - Muheim, F.

AU - Needham, M.

AU - Oliva, F.

AU - O'Neil, R.H.

AU - Ozcelik, O.

AU - Richardson-Slipper, M.

AU - Sarpis, G.

AU - Lavra, L. Soares

AU - Urbach, B.

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2025/3/28

Y1 - 2025/3/28

N2 - Lepton flavor universality in rare b→s transitions is tested for the first time using Bs0 meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb-1. Branching fraction ratios between the Bs0→ϕe+e- and Bs0→ϕμ+μ- decays are measured in three regions of dilepton mass squared, q2, with 0.1

AB - Lepton flavor universality in rare b→s transitions is tested for the first time using Bs0 meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb-1. Branching fraction ratios between the Bs0→ϕe+e- and Bs0→ϕμ+μ- decays are measured in three regions of dilepton mass squared, q2, with 0.1

U2 - 10.1103/PhysRevLett.134.121803

DO - 10.1103/PhysRevLett.134.121803

M3 - Article

SN - 0031-9007

VL - 134

SP - 1

EP - 15

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 121803

ER -

Test of Lepton Flavor Universality with Bs0→ϕℓ+ℓ- Decays

Abstract

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Projects

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons

Cite this