Probing resonant leptogenesis at the LHC

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.076008· OSTI ID:21432336

Blanchet, Steve; Chacko, Z; Granor, Solomon S; Mohapatra, Rabindra N ^[1]

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1. Department of Physics, University of Maryland, College Park, Maryland, 20742 (United States)

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.

• OSTI ID: 21432336
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 7; Other Information: DOI: 10.1103/PhysRevD.82.076008; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

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