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Title: Probing resonant leptogenesis at the LHC

Abstract

We explore direct collider probes of the resonant leptogenesis mechanism for the origin of matter. We work in the context of theories where the standard model (SM) is extended to include an additional gauged U(1) symmetry broken at the TeV scale, and where the light neutrinos obtain mass through a type I seesaw at this scale. The CP asymmetry that generates the observed matter-antimatter asymmetry manifests itself in a difference between the number of positive and negative like-sign dileptons N(l{sup +}l{sup +})-N(l{sup -}l{sup -}) that arise in the decay of the new Z{sup '} gauge boson to two right-handed neutrinos N, and their subsequent decay to leptons. The relatively low efficiency of resonant leptogenesis in this class of models implies that the CP asymmetry, {epsilon}, is required to be sizable, i.e., of order one. In particular, from the sign of the baryon asymmetry of the Universe, an excess of antileptons is predicted. We identify the domains in M{sub Z}{sup '}-M{sub N} space where such a direct test is possible and find that with 300 fb{sup -1} of data and no excess found, the LHC can set the 2{sigma} exclusion limit {epsilon} < or approx. 0.22.

Authors:
; ; ;  [1]
  1. Department of Physics, University of Maryland, College Park, Maryland, 20742 (United States)
Publication Date:
OSTI Identifier:
21432336
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 82; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.82.076008; (c) 2010 American Institute of Physics; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANTILEPTONS; ASYMMETRY; BARYONS; BOSONS; CERN LHC; CP INVARIANCE; EFFICIENCY; MASS; NEUTRINOS; PARTICLE DECAY; PARTICLE PRODUCTION; STANDARD MODEL; SYMMETRY BREAKING; TEV RANGE; U-1 GROUPS; UNIVERSE; ACCELERATORS; ANTIMATTER; ANTIPARTICLES; CYCLIC ACCELERATORS; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; GRAND UNIFIED THEORY; HADRONS; INVARIANCE PRINCIPLES; LEPTONS; LIE GROUPS; MASSLESS PARTICLES; MATHEMATICAL MODELS; MATTER; PARTICLE MODELS; QUANTUM FIELD THEORY; STORAGE RINGS; SYMMETRY GROUPS; SYNCHROTRONS; U GROUPS; UNIFIED GAUGE MODELS

Citation Formats

Blanchet, Steve, Chacko, Z, Granor, Solomon S, and Mohapatra, Rabindra N. Probing resonant leptogenesis at the LHC. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.076008.
Blanchet, Steve, Chacko, Z, Granor, Solomon S, & Mohapatra, Rabindra N. Probing resonant leptogenesis at the LHC. United States. doi:10.1103/PHYSREVD.82.076008.
Blanchet, Steve, Chacko, Z, Granor, Solomon S, and Mohapatra, Rabindra N. Fri . "Probing resonant leptogenesis at the LHC". United States. doi:10.1103/PHYSREVD.82.076008.
@article{osti_21432336,
title = {Probing resonant leptogenesis at the LHC},
author = {Blanchet, Steve and Chacko, Z and Granor, Solomon S and Mohapatra, Rabindra N},
abstractNote = {We explore direct collider probes of the resonant leptogenesis mechanism for the origin of matter. We work in the context of theories where the standard model (SM) is extended to include an additional gauged U(1) symmetry broken at the TeV scale, and where the light neutrinos obtain mass through a type I seesaw at this scale. The CP asymmetry that generates the observed matter-antimatter asymmetry manifests itself in a difference between the number of positive and negative like-sign dileptons N(l{sup +}l{sup +})-N(l{sup -}l{sup -}) that arise in the decay of the new Z{sup '} gauge boson to two right-handed neutrinos N, and their subsequent decay to leptons. The relatively low efficiency of resonant leptogenesis in this class of models implies that the CP asymmetry, {epsilon}, is required to be sizable, i.e., of order one. In particular, from the sign of the baryon asymmetry of the Universe, an excess of antileptons is predicted. We identify the domains in M{sub Z}{sup '}-M{sub N} space where such a direct test is possible and find that with 300 fb{sup -1} of data and no excess found, the LHC can set the 2{sigma} exclusion limit {epsilon} < or approx. 0.22.},
doi = {10.1103/PHYSREVD.82.076008},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {10}
}