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

Journal Article · · Physics Letters. B
 [1]; ORCiD logo [1];  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Physics
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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.

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0009919
OSTI ID:
1414027
Alternate ID(s):
OSTI ID: 1546063
Journal Information:
Physics Letters. B, Vol. 777, Issue C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 153 works
Citation information provided by
Web of Science

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Finite Family Groups for Fermionic and Leptoquark Mixing Patterns text January 2019
Phenomenology of $\,{{b\to c\tau\bar\nu }}\,$ decays in a scalar leptoquark model journal July 2019
Helicity amplitudes in $$B \rightarrow D^{*} \bar{\nu } l$$ B → D ∗ ν ¯ l decay journal November 2018
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New Physics in $${\varvec{b \rightarrow s \ell ^+ \ell ^-}}$$ b → s ℓ + ℓ - confronts new data on lepton universality journal August 2019
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Updated B s -mixing constraints on new physics models for b → s ℓ + ℓ − anomalies journal May 2018
Inclusive nucleon decay searches as a frontier of baryon number violation journal January 2020
Simplified Models of Flavourful Leptoquarks text January 2019
Revisiting R-parity violating interactions as an explanation of the B-physics anomalies text January 2018
Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark text January 2019
Impact of polarization observables and Bc→τν on new physics explanations of the b→cτν anomaly text January 2019
Revisiting the vector leptoquark explanation of the B-physics anomalies text January 2019
Finite family groups for fermionic and leptoquark mixing patterns text January 2020
B Meson Anomalies in a Pati-Salam Model within the Randall-Sundrum Background text January 2018
Simplified models of flavourful leptoquarks text January 2019
$B$ Meson Anomalies in a Pati-Salam Model within the Randall-Sundrum Background text January 2018
Addressing the B-physics anomalies in a fundamental Composite Higgs Model text January 2018
Revisiting R-parity violating interactions as an explanation of the B-physics anomalies text January 2018
Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark text January 2018
Fermionic dark matter in leptoquark portal text January 2018
Lepton non-universality in $B$ decays and fermion mass structure text January 2018
Review of Lepton Universality tests in B decays text January 2018
Leptoquark solution for both the flavor and ANITA anomalies text January 2018
Left-Right SU(4) Vector Leptoquark Model for Flavor Anomalies text January 2018
B-physics anomalies: The bridge between R-parity violating Supersymmetry and flavoured Dark Matter text January 2019
Finite Family Groups for Fermionic and Leptoquark Mixing Patterns text January 2019
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High- $$p_T$$ p T signatures in vector–leptoquark models journal April 2019
Implications for new physics in $$b\rightarrow s \mu \mu $$b→sμμ transitions after recent measurements by Belle and LHCb journal October 2019
Investigating the production of leptoquarks by means of zeros of amplitude at photon electron collider journal June 2020
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Pati-Salam explanations of the B-meson anomalies text January 2018
Third Family Hypercharge Model for $R_{K^{(\ast)}}$ and Aspects of the Fermion Mass Problem text January 2018
$R_{D^{(*)}}$ motivated $\mathcal{S}_1$ leptoquark scenarios: Impact of interference on the exclusion limits from LHC data text January 2018
Collider signature of $V_2$ Leptoquark with $b\to s$ flavour observables text January 2018
Correlation between $R_{D^{(*)}}$ and top quark FCNC decays in leptoquark models text January 2018
High-pT Signatures in Vector-Leptoquark Models text January 2019
Addressing the ${\mathbf R_{D^{(*)}}}$ anomalies with an ${\mathbf S_1}$ leptoquark from $\mathbf{SO(10)}$ grand unification text January 2019
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New Physics in $b \to s \ell^+ \ell^-$ confronts new data on Lepton Universality text January 2019
B-decay discrepancies after Moriond 2019 text January 2019
Baryonic and Leptonic GeV Dark Matter text January 2020
Probing the $R_{K^{(*)}}$ Anomaly at a Muon Collider text January 2021

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Proton decay
Leptoquarks
Pati–Salam unification
B anomalies
Diquarks
oscillations