The eejj excess signal at the LHC and constraints on leptogenesis

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dc.contributor.author Dhuria, Mansi
dc.contributor.author Hati, Chandan
dc.contributor.author Rangarajan, Raghavan
dc.contributor.author Sarkar, Utpal
dc.date.accessioned 2017-11-12T12:55:08Z
dc.date.available 2017-11-12T12:55:08Z
dc.date.issued 2015-09
dc.identifier.citation Dhuria, Mansi; Hati, Chandan; Rangarajan, Raghavan and Sarkar, Utpal, “ The eejj excess signal at the LHC and constraints on leptogenesis”, Journal of Cosmology and Astroparticle Physics, DOI: 10.1088/1475-7516/2015/09/035, vol. 2015, no. 9, Sep. 2015. en_US
dc.identifier.issn 1475-7516
dc.identifier.uri http://dx.doi.org/10.1088/1475-7516/2015/09/035
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/3271
dc.description.abstract We review the non-supersymmetric (Extended) Left-Right Symmetric Models (LRSM) and low energy E6-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 (WR) with mass ~ TeV in certain variants of the LRSM (with gL≠ gR). However such scenarios can not accommodate high-scale leptogenesis. Other attempts have been made to explain leptogenesis while keeping the WR 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 WR 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 E6 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 E6 too cannot explain both the eejj excess signal and leptogenesis simultaneously. en_US
dc.description.statementofresponsibility by Mansi Dhuria, Chandan Hati, Raghavan Rangarajan and Utpal Sarkar
dc.format.extent vol. 2015, no. 9
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject leptogenesis en_US
dc.subject baryon asymmetry en_US
dc.subject particle physics - cosmology connection en_US
dc.title The eejj excess signal at the LHC and constraints on leptogenesis en_US
dc.type Article en_US
dc.relation.journal Journal of Cosmology and Astroparticle Physics


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