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      Disambiguating Seesaw Models using Invariant Mass Variables at Hadron Colliders

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          Abstract

          We propose ways to distinguish between different mechanisms behind the collider signals of TeV-scale seesaw models for neutrino masses using kinematic endpoints of invariant mass variables. We particularly focus on two classes of such models widely discussed in literature: (i) Standard Model extended by the addition of singlet neutrinos and (ii) Left-Right Symmetric Models. Relevant scenarios involving the same "smoking-gun" collider signature of dilepton plus dijet with no missing transverse energy differ from one another by their event topology, resulting in distinctive relationships among the kinematic endpoints to be used for discerning them at hadron colliders. These kinematic endpoints are readily translated to the mass parameters of the on-shell particles through simple analytic expressions which can be used for measuring the masses of the new particles. A Monte Carlo simulation with detector effects is conducted to test the viability of the proposed strategy in a realistic environment. Finally, we discuss the future prospects of testing these scenarios at the \(\sqrt s=14\) and 100 TeV hadron colliders.

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          Highly Manufacturable 1Gb SDRAM

           Kim,  Lee,  Nob (1997)
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            Z4symmetry and the fourth generation

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              Multi-Lepton Collider Signatures of Heavy Dirac and Majorana Neutrinos

              We discuss the possibility of observing multi-lepton signals at the Large Hadron Collider (LHC) from the production and decay of heavy Standard Model (SM) singlet neutrinos added in extensions of SM to explain the observed light neutrino masses by seesaw mechanism. In particular, we analyze two `smoking gun' signals depending on the Dirac or Majorana nature of the heavy neutrino: (i) for Majorana case, the same-sign di-lepton signal which can be used as a probe of lepton-number violation, and (ii) for Dirac case, the tri-lepton signal which conserves lepton number but may violate lepton flavor. Within a minimal Left-Right symmetric framework in which these additional neutrino states arise naturally, we find that in both cases, the signals can be identified with virtually no background beyond a TeV, and the heavy gauge boson W_R can be discovered in this process. This analysis also provides a direct way to probe the nature of seesaw physics involving the SM singlets at TeV scale, and in particular, to distinguish type-I seesaw with purely Majorana heavy neutrinos from inverse seesaw with pseudo-Dirac counterparts.
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                Author and article information

                Journal
                2015-10-14
                2016-01-17
                Article
                1510.04328

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                TUM-HEP-1022/15, CETUP2015-026, UMD-PP-015-014
                35 pages, 12 figures, 2 tables; minor changes, accepted for publication in JHEP
                hep-ph hep-ex

                High energy & Particle physics

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