Implications of new evidence for lepton-universality violation in b→sℓ+ℓ- decays - INSPIRE

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Implications of new evidence for lepton-universality violation in b→sℓ+ℓ- decays

Li-Sheng Geng
(
- Beihang U. and
- Zhengzhou U.
)
,
Benjamín Grinstein
(
- UC, San Diego
)
,
Sebastian Jäger
(
- Sussex U.
)
,
Shuang-Yi Li
(
- Beihang U.
)
,
Jorge Martin Camalich
(
- IAC, La Laguna and
- Laguna U., Tenerife
)

Mar 23, 2021

6 pages

Published in:

Phys.Rev.D 104 (2021) 3, 035029

Published: Aug 1, 2021

e-Print:

2103.12738 [hep-ph]

DOI:

10.1103/PhysRevD.104.035029 (publication)

View in:

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Abstract: (APS)

Motivated by renewed evidence for new physics in

b \to s ℓ ℓ

transitions in the form of LHCb’s new measurements of theoretically clean lepton-universality ratios and the purely leptonic

B_{s} \to μ^{+} μ^{-}

decay, we quantify the combined level of discrepancy with the Standard Model and fit values of short-distance Wilson coefficients. A combination of the clean observables

R_{K}

,

R_{K^{*}}

, and

B_{s} \to μ μ

alone results in a discrepancy with the Standard Model at

4.0 σ

, up from

3.5 σ

in 2017. One-parameter scenarios with purely left-handed or with purely axial coupling to muons fit the data well and result in a

\sim 5 σ

pull from the Standard Model. In a two-parameter fit of new-physics contributions with both vector and axial-vector couplings to muons the allowed region is much more restricted than in 2017, principally due to the much more precise result on

B_{s} \to μ^{+} μ^{-}

, which probes the axial coupling to muons. Including angular observables data restricts the allowed region further. A by-product of our analysis is an updated average of

BR (B_{s} \to μ^{+} μ^{-}) = (2.8 \pm 0.3) \times 10^{- 9}

.

Note:

In the Appendix, we update the clean fits by considering the latest measurements of the branching fraction ratios $R_{K^0_s}$ and $R_{K^{*+}}$ by the LHCb Collaboration and show that two one-parameter scenarios and a two-parameter scenario fit the data well and result in a pull from the SM crossing the 5.0$\sigma$ threshold

lepton: flavor: universality
lepton: universality: violation
B: semileptonic decay
B: branching ratio
branching ratio: ratio
effective Hamiltonian
operator: Wilson
form factor
LHC-B
BELLE

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