https://doi.org/10.1140/epjc/s10052-019-7219-0
Regular Article - Theoretical Physics
Lepton flavor non-universality in the B-sector: a global analyses of various new physics models
1
Indian Institute of Technology Jodhpur, Jodhpur, 342037, India
2
Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai, 400005, India
3
University of Rajasthan, Jaipur, 302004, India
* e-mail: akalok@iitj.ac.in
Received:
11
May
2019
Accepted:
11
August
2019
Published online:
22
August
2019
The measurements of the ratios 
along with 
hint towards lepton flavor non universality which is in disagreement with the standard model. In this work, we reanalyze the four new physics models, which are widely studied in the literature as a candidates for the simultaneous explanations of these measurements. These are, standard model like vector boson (VB), 
-singlet vector leptoquark (
), -triplet scalar leptoquark (
) and triplet vector leptoquark (
) models. We assume a coupling only to the third generation in the weak basis, so that the 
transition is generated only via mixing effects. Preforming a global fit to all relevant data, we show that the vector boson model violates the current upper bound on 
and hence is inconsistent with the present data. Further, we show that within this framework, the leptoquark model cannot simultaneously accommodate and measurements. We emphasize that this conclusion is independent of the additional constraints coming from renormaliztion group running effects and high-
searches. In addition, we show that the and models are highly disfavored by the constraints coming from 
data. Finally, we find a that hypothesis of two LQ particles is also challenged by 
data.
© The Author(s), 2019
