Leptoquark flavor patterns & B decay anomalies

By G. Hiller, Dennis Loose, K. Schönwald. 2016

147 citations recorded by the source corpus.

A bstractFlavor symmetries that explain masses and mixings of the standard model fermions dictate flavor patterns for the couplings of scalar and vector leptoquarks to the standard model fermions. A generic feature is that couplings to SU(2)-doublet leptons are suppressed at least by one spurion of the discrete non-abelian symmetry breaking, responsible for neutrino mixing, while couplings to charged lepton singlets can be order one. We obtain testable patterns including those that predominantly couple to a single lepton flavor, or two, or in a skewed way. They induce lepton non-universality, which we contrast to current anomalies in B-decays. We find maximal effects in RD and RD∗$$ {R_D}_{{}^{\ast }} $$ at the level of ∼10 percent and few percent, respectively, while leptoquark effects in RK∗$$ {R_K}_{{}^{\left(\ast \right)}} $$ can reach order few×10 percent. Predictions for charm and kaon decays and μ − e conversion are worked out.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/890e219680c661840151efd10a798108828aebdd

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In Nuclear and High Energy Physics

Citations in the corpus

B-decay discrepancies after Moriond 2019 (2019, methodology): “Explaining the data by a single mediator: the U1 leptoquark solution The only single mediator that can yield non-zero values for [C (1) lq ]3323 = [C (3) lq ]3323 and [C (1) lq ]2223 = [C (3) lq ]2223 is the U1 vector leptoquark [35,37,38,40,81–92], which transforms as (3,1)2/3 under the SM gauge gr”
Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “For different models, not excluded by the current experimental constraints, the expected branching fraction for the LFV process B0 s→ τ±μ∓ is in the range 10−9−10−4 [269, 270,273,279–288].”