A global analysis of b→sℓℓ data in heavy and light Z′ models

We perform a model-independent global fit to all b → s ℓ ℓ data in the light of recent measurements of the lepton flavour universality violating (LFUV) observables R K S 0 , R K ∗ + , and the updated observables in B s → ϕ μ + μ - decay, by the LHCb collaboration. Assuming NP only in the muon sector...

Full description

Saved in:
Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-10, Vol.82 (10)
Main Authors: Alok, Ashutosh Kumar, Chundawat, Neetu Raj Singh, Gangal, Shireen, Kumar, Dinesh
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Collaboration
Elementary Particles
Flavors
Hadrons
Heavy Ions
Leptons
Measurement Science and Instrumentation
Muons
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Ratios
Regular Article - Theoretical Physics
String Theory
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We perform a model-independent global fit to all b → s ℓ ℓ data in the light of recent measurements of the lepton flavour universality violating (LFUV) observables R K S 0 , R K ∗ + , and the updated observables in B s → ϕ μ + μ - decay, by the LHCb collaboration. Assuming NP only in the muon sector, we find that the 1D NP scenarios C 9 NP < 0 and C 9 NP = - C 10 NP continue to be the most favoured ones. However, the significance of the favoured scenario C 9 NP = - C 9 ′ has reduced and the updated data now marginally prefers C 10 NP > 0 scenario. The 2D scenarios ( C 9 NP , C 10 ′ ) , ( C 9 NP , C 9 ′ ) and ( C 9 NP , C 10 NP ) , continue to be favoured by the data in the listed order. We analyse generic TeV scale Z ′ models which can generate the 1D scenarios, C 9 NP < 0 and C 9 NP = - C 10 NP as well as 2D scenarios ( C 9 NP , C 9 ′ ) and ( C 9 NP , C 10 NP ) . We find that all four models provide an equally good fit to the data. We also consider a model with a 25 MeV Z ′ that couples to muons only and has a q 2 dependent b - s coupling. We study the implications of the current data on the LFUV observables R ϕ , Q 4 , 5 as well as R K ( ∗ ) in the high q 2 . We find that the Q 4 , 5 observables have a potential to discriminate between a few favored solutions, and disentangle different heavy and light Z ′ scenarios.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10816-w