arXiv subjects

Avirup Shaw

Publications and source records attributed to Avirup Shaw.

22 records · Page 2Linked to original sources

arXiv2014

LHC limits on KK-parity non-conservation in the strong sector of universal extra-dimension models

In five-dimensional universal extra-dimensional models compactified on an $S^1/Z_2$ orbifold four-dimensional kinetic terms are allowed at the two fixed points. If these terms are unequal then Kaluza-Klein (KK) parity is broken. Within such a framework we consider resonant production of the n = 1 KK-gluon at the Large Hadron Collider and its subsequent decay to $t\bar{t}$, where both production and decay are KK-parity non-conserving. We use, for the first time, the exclusion data for a $t\bar{t}$ resonance obtained by the ATLAS collaboration to limit the mass ranges of quark and gluon excitations of the KK-parity-violating model which are found to be in the ballpark of 900 GeV.

hep-ph↗

arXiv2013

Universal Extra-Dimensional models with boundary terms: Probing at the LHC

In universal extra-dimensional models a conserved Z_2 parity stabilizes the lightest Kaluza-Klein particle, a dark-matter candidate. Boundary-localized kinetic terms, in general, do not preserve this symmetry. We examine, in the presence of such terms, the single production of Kaluza-Klein excitations of the neutral electroweak gauge bosons and their decay to zero-mode fermion-antifermion pairs. We explore how experiments at the Large Hadron Collider constrain the boundary-localized kinetic terms for different compactification radii.

hep-ph↗

arXiv2013

Boundary Localized Terms in Universal Extra-Dimensional Models through a Dark Matter perspective

In universal extra dimension (UED) models with one compactified extra dimension, a Z_2 symmetry, termed KK-parity, ensures the stability of the lightest Kaluza-Klein particle (LKP). This symmetry leads to two fixed points. In non-minimal versions of UED boundary-localised terms (BLT) for different fields are included at these fixed points and KK-parity may be violated. However, BLTs with same strength at both points induce a new Z_2 symmetry which restores the stability of the LKP. We show that the BLTs serve to relax the bounds set on the compactification scale in UED by the dark matter relic density requirement. At the same time, the precision of the dark matter measurements severely correlates the BLT parameters of gauge bosons and fermions. Depending on the parameter values, the LKP can be chosen to be the level-1 photon, which is essentially the B^(1), or the level-1 Z-boson, basically the W_3^(1). We find that in the latter case the relic density is too small for a W_3^(1) with a \sim 1 TeV mass. We also explore the prospects of direct detection of an LKP which matches the observed dark matter relic density.

hep-ph↗

arXiv2013

Universal Extra-Dimensional models with boundary localized kinetic terms: Probing at the LHC

In universal extra-dimensional models a conserved $Z_2$ parity ensures the stability of the lightest Kaluza-Klein particle, a potential dark-matter candidate. We show here that boundary-localized kinetic terms, in general, do not preserve this symmetry. We examine the single production of a Kaluza-Klein excitation of the photon and its decay to zero-mode fermion-antifermion pairs in the presence of such terms. We explore how experiments at the Large Hadron Collider at CERN can help constrain the boundary-localized kinetic terms for different choices of the compactification radius.

hep-ph↗