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On Baryon and Lepton Number Violation
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On Baryon and Lepton Number Violation
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In this report we discuss the main theories to understand the origin of baryon and lepton number violation in physics beyond the Standard Model. We present the theoretical predictions for rare processes such as neutrinoless double beta decay, proton decay, and neutron-antineutron oscillation, and overview the prospects to discover these rare processes in the near future. The possibility to observe baryon and lepton violating signatures at current and future colliders and through precision studies of other rare processes, and the testability of different baryogenesis mechanisms is discussed in detail. A healthy and broad experimental program looking for proton decay, neutrinoless double beta decay and neutron-antineutron oscillations is essential to make new discoveries in this field. These searches are carried out at various experimental facilities in the US and abroad, and use instrumentation arching across traditional HEP/NP boundaries. In addition, experiments such as those at the Large Hadron Collider could discover exotic baryon and/or lepton number violating signatures connected to low energy scale theories for neutrino masses, supersymmetric models with R-parity violation, new gauge theories or other mechanisms for physics beyond the Standard Model. The landscape presented in this report could be crucial to discover the underlying mechanism for neutrino masses and the matter-antimatter asymmetry in the universe.
Forward citations
Cited by 4 Pith papers
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Basis for non-derivative baryon-number-violating operators
A minimal basis with fewer terms and simpler contractions is given for non-derivative baryon-number-violating operators in SMEFT up to mass dimension 11.
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Matter Unification and Lepton Flavour Violation
Muon-to-electron conversion at Mu2e can probe quark–lepton unification scales up to ~10^4 TeV in the minimal SU(4)_C×SU(2)_L×U(1)_R model, even where rare kaon decays are suppressed by unknown mixing angles.
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Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN
NA64 reports improved upper limits on g_{B-L} for sub-GeV Z' masses using resonant production and invisible decay channels from a dataset three times larger than prior analyses.
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Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN
NA64 sets improved upper limits on g_{B-L} for sub-GeV Z' using 9.4e11 electrons on target, exceeding prior neutrino-scattering bounds in the unbroken U(1)_{B-L} scenario.
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