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Title: The eejj excess signal at the LHC and constraints on leptogenesis

Abstract

We review the non-supersymmetric (Extended) Left-Right Symmetric Models (LRSM) and low energy E{sub 6}-based models to investigate if they can explain both the recently detected excess eejj signal at CMS and leptogenesis. The eejj excess can be explained from the decay of the right-handed gauge bosons (W{sub R}) with mass ∼ TeV in certain variants of the LRSM (with g{sub L}≠ g{sub R}). However such scenarios can not accommodate high-scale leptogenesis. Other attempts have been made to explain leptogenesis while keeping the W{sub R} mass almost within the reach of the LHC by considering the resonant leptogenesis scenario in the context of the LRSM for relatively large Yukawa couplings. However, certain lepton number violating scattering processes involving the right-handed Higgs triplet and the right-handed neutrinos can stay in equilibrium till the electroweak phase transition and can washout the lepton asymmetry generated in the resonant leptogenesis scenario for mass range of W{sub R} as indicated by the CMS excess signal. Thus in such a scenario one needs to invoke post-sphaleron baryogenesis to explain the observed baryon asymmetry of the universe. Next, we consider three effective low energy subgroups of the superstring inspired E{sub 6} model having a number of additional exotic fermionsmore » which provides a rich phenomenology to be explored. We however find that these three effective low energy subgroups of E{sub 6} too cannot explain both the eejj excess signal and leptogenesis simultaneously.« less

Authors:
; ; ;  [1]
  1. Physical Research Laboratory, Navrangpura, Ahmedabad 380 009 (India)
Publication Date:
OSTI Identifier:
22525389
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; BARYONS; CERN LHC; HIGGS BOSONS; HIGGS MODEL; LEPTON NUMBER; LIMITING VALUES; MASS; NEUTRINOS; PARTICLE PRODUCTION; PHASE TRANSFORMATIONS; SCATTERING; SUPERSTRING MODELS; SUPERSTRING THEORY; SUPERSYMMETRY; TEV RANGE; TRIPLETS; UNIVERSE

Citation Formats

Dhuria, Mansi, Hati, Chandan, Rangarajan, Raghavan, and Sarkar, Utpal. The eejj excess signal at the LHC and constraints on leptogenesis. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/09/035.
Dhuria, Mansi, Hati, Chandan, Rangarajan, Raghavan, & Sarkar, Utpal. The eejj excess signal at the LHC and constraints on leptogenesis. United States. doi:10.1088/1475-7516/2015/09/035.
Dhuria, Mansi, Hati, Chandan, Rangarajan, Raghavan, and Sarkar, Utpal. Tue . "The eejj excess signal at the LHC and constraints on leptogenesis". United States. doi:10.1088/1475-7516/2015/09/035.
@article{osti_22525389,
title = {The eejj excess signal at the LHC and constraints on leptogenesis},
author = {Dhuria, Mansi and Hati, Chandan and Rangarajan, Raghavan and Sarkar, Utpal},
abstractNote = {We review the non-supersymmetric (Extended) Left-Right Symmetric Models (LRSM) and low energy E{sub 6}-based models to investigate if they can explain both the recently detected excess eejj signal at CMS and leptogenesis. The eejj excess can be explained from the decay of the right-handed gauge bosons (W{sub R}) with mass ∼ TeV in certain variants of the LRSM (with g{sub L}≠ g{sub R}). However such scenarios can not accommodate high-scale leptogenesis. Other attempts have been made to explain leptogenesis while keeping the W{sub R} mass almost within the reach of the LHC by considering the resonant leptogenesis scenario in the context of the LRSM for relatively large Yukawa couplings. However, certain lepton number violating scattering processes involving the right-handed Higgs triplet and the right-handed neutrinos can stay in equilibrium till the electroweak phase transition and can washout the lepton asymmetry generated in the resonant leptogenesis scenario for mass range of W{sub R} as indicated by the CMS excess signal. Thus in such a scenario one needs to invoke post-sphaleron baryogenesis to explain the observed baryon asymmetry of the universe. Next, we consider three effective low energy subgroups of the superstring inspired E{sub 6} model having a number of additional exotic fermions which provides a rich phenomenology to be explored. We however find that these three effective low energy subgroups of E{sub 6} too cannot explain both the eejj excess signal and leptogenesis simultaneously.},
doi = {10.1088/1475-7516/2015/09/035},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 09,
volume = 2015,
place = {United States},
year = {2015},
month = {9}
}