Anomalies in B-decays and U(2) flavor symmetry

By R. Barbieri, G. Isidori, Andrea Pattori, Fabrizio Senia. 2015

300 citations recorded by the source corpus.

The collection of a few anomalies in semileptonic B-decays invites to speculate about the emergence of some strikingly new phenomena. Here we offer a possible interpretation of these anomalies in the context of a weakly broken $$U(2)^5$$U(2)5 flavor symmetry and leptoquark mediators.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/65e2ad867666cc2f03ca8b9e1984dd6da0849808

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In Nuclear and High Energy Physics

Citations in the corpus

Vector boson fusion at multi-TeV muon colliders (2020, background): “While the spectrum of leptoquark models is vast, especially interesting options are those featuring vector leptoquarks due to their direct role in GUTs and recent demonstrations of their ultraviolet completions [140–143].”
Physics beyond colliders at CERN: beyond the Standard Model working group report (2019, background): “Explanations for the B anomalies include models with flavour violation only in the third generation [116], theories with an additional Z ′ [349], and theories with leptoquarks [350].”
Review of lepton universality tests in B decays (2018, background): “ector-like fermions [180,181], or in Z0models with a gauged horizontal symmetry [213]. Concerning leptoquarks, here a single representation (either R2 or U1) can generate a CNP 9 = C NP 10 solution [176,177,195, 196,198,214,215]. This pattern can also be obtained in models with loop contributions fr”
B-decay discrepancies after Moriond 2019 (2019, background): “c couplings g32 lq g33 lq & 0:1 is required (assuming vanishing right-handed couplings), which is compatible with ndings in [86]. This puts some tension on models based on a U(2) q avour symmetry [37,86,90,92], where the natural expectation for the size of g32 lq g33 lq is jV cbjˇ0:04. Based on ”
Revisiting the vector leptoquark explanation of the B-physics anomalies (2019, background): “he attention has shifted recently towards the development of more complete (and more complex) models with a consistent ultraviolet (UV) behavior (see in particular [24{37]). Already in early attempts [11,14], the U 1 ˘(3;1) 2=3 vector leptoquark, coupled mainly to thirdgeneration fermions, emerged a”