Probing the RK(*) anomaly at a muon collider

Huang, Guo-yuan; Jana, Sudip; Queiroz, Farinaldo S.; Rodejohann, Werner

doi:10.1103/PhysRevD.105.015013

Probing the RK(*) anomaly at a muon collider

Mar 2, 2021

10 pages

Published in:

Phys.Rev.D 105 (2022) 1, 015013

Published: Jan 1, 2022

e-Print:

2103.01617 [hep-ph]

DOI:

10.1103/PhysRevD.105.015013 (publication)

Experiments:

MUON-COLLIDER

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Abstract: (APS)

The LHCb measurements of the

μ / e

ratio in

B \to K ℓ ℓ

decays

(R_{K})

indicate a deficit with respect to the Standard Model prediction, supporting earlier hints of lepton universality violation observed in the

R_{K^{(*)}}

ratio. Possible explanations of these

B

-physics anomalies include heavy

Z^{'}

bosons or scalar and vector leptoquarks mediating

b \to s μ^{+} μ^{-}

. We note that a muon collider can directly measure this process via

μ^{+} μ^{-} \to b \bar{s}

and can shed light on the lepton nonuniversality scenario. Investigating currently discussed center-of-mass energies

\sqrt{s} = 3

, 6 and 10 TeV, we show that the parameter space of

Z^{'}

and leptoquark solutions to the

R_{K^{(*)}}

anomalies can be mostly covered. Effective operators explaining the anomalies can be probed with the muon collider setup

\sqrt{s} = 6 TeV

and integrated luminosity

L = 4 {ab}^{- 1}

.

B: semileptonic decay
B: branching ratio
branching ratio: ratio
lepton: universality: violation
leptoquark: scalar
Z'
effective operator
operator: Wilson
LHC-B
CERN LHC Coll: upgrade

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