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Title: Baryon number and lepton universality violation in leptoquark and diquark models

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.

Authors:
; ORCiD logo;
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414027
Alternate Identifier(s):
OSTI ID: 1546063
Grant/Contract Number:  
SC0009919
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 777 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Proton decay; Leptoquarks; Pati–Salam unification; B anomalies; Diquarks; oscillations

Citation Formats

Assad, Nima, Fornal, Bartosz, and Grinstein, Benjamín. Baryon number and lepton universality violation in leptoquark and diquark models. Netherlands: N. p., 2018. Web. https://doi.org/10.1016/j.physletb.2017.12.042.
Assad, Nima, Fornal, Bartosz, & Grinstein, Benjamín. Baryon number and lepton universality violation in leptoquark and diquark models. Netherlands. https://doi.org/10.1016/j.physletb.2017.12.042
Assad, Nima, Fornal, Bartosz, and Grinstein, Benjamín. Thu . "Baryon number and lepton universality violation in leptoquark and diquark models". Netherlands. https://doi.org/10.1016/j.physletb.2017.12.042.
@article{osti_1414027,
title = {Baryon number and lepton universality violation in leptoquark and diquark models},
author = {Assad, Nima and Fornal, Bartosz and Grinstein, Benjamín},
abstractNote = {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.},
doi = {10.1016/j.physletb.2017.12.042},
journal = {Physics Letters B},
number = C,
volume = 777,
place = {Netherlands},
year = {2018},
month = {2}
}

Journal Article:
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https://doi.org/10.1016/j.physletb.2017.12.042

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Cited by: 46 works
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