Vector leptoquarks beyond tree level. III. Vectorlike fermions and flavor-changing transitions
Abstract
Extending previous work on this subject, we evaluate the impact of vectorlike fermions at next-to-leading order accuracy in models with a massive vector leptoquark embedded in the S U (4 )×S U (3 )'×S U (2 )L×U (1 )X gauge group. Vectorlike fermions induce new sources of flavor symmetry breaking, resulting in tree-level flavor-changing couplings for the leptoquark not present in the minimal version of the model. These, in turn, lead to a series of nonvanishing flavor-changing neutral-current amplitudes at the loop level. We systematically analyze these effects in semileptonic, dipole and Δ F =2 operators. The impact of these corrections in b →s ν ν and b →c τ ν observables are discussed in detail. In particular, we show that, in the parameter region providing a good fit to the B -physics anomalies, the model predicts a 10% to 50% enhancement of B (B →K(*)ν ν ) .
- Publication:
-
Physical Review D
- Pub Date:
- December 2020
- DOI:
- 10.1103/PhysRevD.102.115015
- arXiv:
- arXiv:2009.11296
- Bibcode:
- 2020PhRvD.102k5015F
- Keywords:
-
- High Energy Physics - Phenomenology
- E-Print:
- 11 pages + 3 appendices, 4 figures