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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. doi: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. doi: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. doi: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:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2017.12.042

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Cited by: 46 works
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Works referencing / citing this record:

Simplified models of flavourful leptoquarks
journal, June 2019


New Physics in $${\varvec{b \rightarrow s \ell ^+ \ell ^-}}$$ b → s ℓ + ℓ - confronts new data on lepton universality
journal, August 2019


Phenomenology of an extended IDM with loop-generated fermion mass hierarchies
journal, July 2019

  • Cárcamo Hernández, A. E.; Kovalenko, Sergey; Pasechnik, Roman
  • The European Physical Journal C, Vol. 79, Issue 7
  • DOI: 10.1140/epjc/s10052-019-7101-0

Simplified models of flavourful leptoquarks
journal, June 2019


Phenomenology of an extended IDM with loop-generated fermion mass hierarchies
journal, July 2019

  • Cárcamo Hernández, A. E.; Kovalenko, Sergey; Pasechnik, Roman
  • The European Physical Journal C, Vol. 79, Issue 7
  • DOI: 10.1140/epjc/s10052-019-7101-0

New Physics in $${\varvec{b \rightarrow s \ell ^+ \ell ^-}}$$ b → s ℓ + ℓ - confronts new data on lepton universality
journal, August 2019