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 matterantimatter asymmetry manifests itself in a difference between the number of positive and negative likesign 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 righthanded 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:

 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 05562821
 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; U1 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 matterantimatter asymmetry manifests itself in a difference between the number of positive and negative likesign 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 righthanded 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 = {05562821},
number = 7,
volume = 82,
place = {United States},
year = {2010},
month = {10}
}