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Title: Baryon number violation via Majorana neutrinos

Abstract

We propose and investigate a novel, minimal, and experimentally testable framework for baryo- genesis, dubbed dexiogenesis, using baryon number violating effective interactions of right-handed Majorana neutrinos responsible for the seesaw mechanism. The distinct LHC signature of our framework is same-sign top quark final states, possibly originating from displaced vertices. The region of parameters relevant for LHC phenomenology can also yield concomitant signals in nucleon decay experiments. We provide a simple ultraviolet origin for our effective operators, by adding a color-triplet scalar, which could ultimately arise from a grand unified theory.

Authors:
 [1]
  1. Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22609078
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1743; Journal Issue: 1; Conference: CETUP 2015: Workshop on dark matter, neutrino physics and astrophysics, Deadwood, SD (United States), 15 Jun - 17 Jul 2015, PPC 2015: 9. international conference on interconnections between particle physics and cosmology, Deadwood, SD (United States), 15 Jun - 17 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARYON NUMBER; CERN LHC; GRAND UNIFIED THEORY; INTERACTIONS; MAJORANA FERMIONS; MAJORANA SPINORS; NUCLEONS; PARTICLE DECAY; T QUARKS; TRIPLETS; ULTRAVIOLET RADIATION

Citation Formats

Zhang, Yue. Baryon number violation via Majorana neutrinos. United States: N. p., 2016. Web. doi:10.1063/1.4953292.
Zhang, Yue. Baryon number violation via Majorana neutrinos. United States. doi:10.1063/1.4953292.
Zhang, Yue. Tue . "Baryon number violation via Majorana neutrinos". United States. doi:10.1063/1.4953292.
@article{osti_22609078,
title = {Baryon number violation via Majorana neutrinos},
author = {Zhang, Yue},
abstractNote = {We propose and investigate a novel, minimal, and experimentally testable framework for baryo- genesis, dubbed dexiogenesis, using baryon number violating effective interactions of right-handed Majorana neutrinos responsible for the seesaw mechanism. The distinct LHC signature of our framework is same-sign top quark final states, possibly originating from displaced vertices. The region of parameters relevant for LHC phenomenology can also yield concomitant signals in nucleon decay experiments. We provide a simple ultraviolet origin for our effective operators, by adding a color-triplet scalar, which could ultimately arise from a grand unified theory.},
doi = {10.1063/1.4953292},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1743,
place = {United States},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}
  • The possibility of discovering heavy Majorana neutrinos and lepton number violation via the like-sign dilepton signal at hadron supercolliders is investigated. The cross sections for the production of these neutrinos singly as well as in pairs are computed both in three- and four-generation scenarios within the framework of the gauge group SU(2)[sub [ital L]][direct product]U(1)[sub [ital Y]] and the dominant processes are identified. The suppression of the standard model background by suitable kinematical cuts is also discussed.
  • Weak interaction theories with Majorana masses for neutrinos have lepton number violating reactions. We consider gravitational collapse of massive stars in such a model and find that if the lepton nonconserving reactions occur, the dynamics of collapse will be drastically different from the low-entropy collapse that follows from the usual assumption of lepton number conservation.
  • Tree level diagonalization of a neutrino mass matrix with both Majorana and Dirac masses is discussed in a general context. Flavor-changing neutral currents (FCNC{close_quote}s) in such models are inevitable. Rephasing-invariant quantities characterizing CP violation in FCNC{close_quote}s fermion{endash}Higgs-boson interactions are identified. Scenarios with maximal CP violation are discussed. At the one-loop level, the mass eigenstates become an impure Majorana type, if neutrinos decay. The possibility of a significant change in the originally hierarchical mass spectrum for the left-handed neutrinos is explored, with an example of two species of neutrinos. Neutrino oscillations with impure Majorana neutrinos are also discussed. {copyright} {ital 1997}more » {ital The American Physical Society}« less
  • We analyze the scenario of baryogenesis through leptogenesis induced by the out-of-equilibrium decays of heavy Majorana neutrinos and pay special attention to CP violation. Extending a recently proposed resummation formalism for two-fermion mixing to decay amplitudes, we calculate the resonant phenomenon of CP violation due to the mixing of two nearly degenerate heavy Majorana neutrinos. Solving numerically the relevant Boltzmann equations, we find that the isosinglet Majorana mass may range from 1 TeV up to the grand unification scale, depending on the mechanism of CP violation and/or the flavor structure of the neutrino mass matrix assumed. Finite temperature effects andmore » possible constraints from the electric dipole moment of electron and other low-energy experiments are briefly discussed. {copyright} {ital 1997} {ital The American Physical Society}« less