CERN Accelerating science

Article
Report number	arXiv:1905.05211
Title	Pati-Salam and lepton universality in B decays
Author(s)	Heeck, Julian (UC, Irvine) ; Teresi, Daniele (Pisa U. ; INFN, Pisa)
Publication	2019
Imprint	2019-05-13
Number of pages	6
Note	6 pages, contribution to the 2019 EW session of the 54th Rencontres de Moriond
In:	54th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 16 - 23 Mar 2019, pp.333-338
Subject category	hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Abstract	Recent hints for lepton-flavor non-universality in $B$-meson decays can be interpreted as hints for the existence of leptoquarks. We show that scalar leptoquarks unavoidably arise in grand unified theories, using the well-known Pati-Salam model as an example. These GUT-motivated leptoquarks can have a number of appealing features including automatic absence of proton decay, purely chiral couplings, and relations between the various leptoquark couplings. We show that $R(K^{(*)})$ can be connected to the neutrino mass matrix that arises via type-II seesaw, resulting in testable lepton flavor violation. In order to also explain $R(D^{(*)})$ one instead has to assume the existence of light right-handed neutrinos, once again with testable predictions in other $B$-meson decays and at the LHC.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © Published by ARISF, 2019

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