Test of Lepton Flavor Universality with <math display="inline"><msubsup><mi>B</mi><mi>s</mi><mn>0</mn></msubsup><mo stretchy="false">→</mo><mi>ϕ</mi><msup><mo>ℓ</mo><mo>+</mo></msup><msup><mo>ℓ</mo><mo>-</mo></msup></math> Decays

Aaij, Roel; Abdelmotteleb, Ahmed Sameh Wagih; Abellan Beteta, Carlos; Abudinén, Fernando Jesus; Ackernley, Thomas; Adefisoye, A.A.; Adefisoye, Ayomide Matthew; Adeva, Bernardo; Adinolfi, Marco; Adlarson, Patrik Harri

doi:10.1103/PhysRevLett.134.121803

Test of Lepton Flavor Universality with $B_{s}^{0} \to ϕ ℓ^{+} ℓ^{-}$ Decays

LHCb

Collaboration

Oct 17, 2024

24 pages

Published in:

Phys.Rev.Lett. 134 (2025) 12, 121803

Published: Mar 27, 2025

e-Print:

2410.13748 [hep-ex]

DOI:

10.1103/PhysRevLett.134.121803 (publication)

Report number:

LHCb-PAPER-2024-032,
CERN-EP-2024-255

Experiments:

CERN-LHC-LHCb

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Abstract: (APS)

Lepton flavor universality in rare

b \to s

transitions is tested for the first time using

B_{s}^{0}

meson decays. The measurements are performed using

p p

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

B_{s}^{0} \to ϕ e^{+} e^{-}

and

B_{s}^{0} \to ϕ μ^{+} μ^{-}

decays are measured in three regions of dilepton mass squared,

q^{2}

, with

0.1 < q^{2} < 1.1

,

1.1 < q^{2} < 6.0

, and

15 < q^{2} < 19 {GeV}^{2} / c^{4}

. The results agree with the standard model expectation of lepton flavor universality.

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3513/ (LHCb public pages)

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

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Test of Lepton Flavor Universality with $B_{s}^{0} \to ϕ ℓ^{+} ℓ^{-}$ Decays