Baryon number and lepton universality violation in leptoquark and diquark models
By Nima Assad, B. Fornal, B. Grinstein. 2017
239 citations recorded by the source corpus.
Abstract We perform a systematic study of models involving leptoquarks and diquarks with masses well below the grand unification scale and demonstrate that a large class of them is excluded due to rapid proton decay. After singling out the few phenomenologically viable color triplet and sextet scenarios, we show that there exist only two leptoquark models which do not suffer from tree-level proton decay and which have the potential for explaining the recently discovered anomalies in B meson decays. Both of those models, however, contain dimension five operators contributing to proton decay and require a new symmetry forbidding them to emerge at a higher scale. This has a particularly nice realization for the model with the vector leptoquark ( 3 , 1 ) 2 / 3 , which points to a specific extension of the Standard Model, namely the Pati–Salam unification model, where this leptoquark naturally arises as the new gauge boson. We explore this possibility in light of recent B physics measurements. Finally, we analyze also a vector diquark model, discussing its LHC phenomenology and showing that it has nontrivial predictions for neutron–antineutron oscillation experiments.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/58e16094d2f9cf048b2949be07c5ebb632d6f54f
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In Nuclear and High Energy Physics
- David M. Straub
- S. Descotes-Genon
- Simone Bifani
- M. Schune
- A. Vidal
- P. Stangl
- W. Altmannshofer
- Jason Aebischer
Citations in the corpus
- Review of lepton universality tests in B decays (2018, background): “Stringent bounds coming from light-quark processes require different couplings of the leptoquark to the different generations, leading to the introduction of a Pati-Salam gauge group for each of the three generations [207,224–228].”
- 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”