Minimal and nonminimal universal extra dimension models in the light of LHC data at 13 TeV

Avnish Avnish,Kirtiman Ghosh,Saurabh Niyogi,Tapoja Jha

doi:10.1103/physrevd.103.115011

Abstract

Universal Extra Dimension (UED) is a well-motivated and well-studied scenario. One of the main motivations is the presence of a dark matter (DM) candidate namely, the lightest level-1 Kaluza-Klein (KK) particle (LKP), in the particle spectrum of UED. The minimal version of UED (mUED) scenario is highly predictive with only two parameters namely, the radius of compactification and cut-off scale, to determine the phenomenology. Therefore, stringent constraint results from the WMAP/PLANCK measurement of DM relic density (RD) of the universe. The production and decays of level-1 quarks and gluons in UED scenarios give rise to multijet final states at the Large Hadron Collider (LHC) experiment. We study the ATLAS search for multijet plus missing transverse energy signatures at the LHC with 13 TeV center of mass energy and 139 inverse femtobarn integrated luminosity. In view of the fact that the DM RD allowed part of mUED parameter-space has already been ruled out by the ATLAS multijet search, we move on to a less restricted version of UED namely, the non-minimal UED (nmUED), with non-vanishing boundary-localized terms (BLTs). The presence of BLTs significantly alters the dark matter as well as the collider phenomenology of nmUED. We obtain stringent bounds on the BLT parameters from the ATLAS multijet plus missing transverse energy search.

Highlights

After almost a decade long running, the Large Hadron Collider (LHC) collected and analyzed 139 fb−1 integrated luminosity data along with a boasting discovery of the Higgs boson [1,2], confirming the mechanism behind masses of the weak gauge bosons and fermions of the Standard Model (SM)
We have studied one universal extra dimension scenario against the dataset recorded by the ATLAS Collaboration ipn ffiffiproton-proton collisions at a center-of-mass energy s 1⁄4 13 TeV, corresponding to an integrated luminosity of 139 fb−1
Our study clearly shows that minimal version of UED (mUED) parameter space is completely ruled out by the ATLAS multijet þ =ET analysis together with the dark matter relic density data

Summary

INTRODUCTION

After almost a decade long running, the Large Hadron Collider (LHC) collected and analyzed 139 fb−1 integrated luminosity data along with a boasting discovery of the Higgs boson [1,2], confirming the mechanism behind masses of the weak gauge bosons and fermions of the Standard Model (SM). It has already been shown in the literature [55,56,57] that the parts of the R−1-Λ plane of mUED that are consistent with the WMAP/PLANCK [58,59] observed relic density (RD) data, are on the verge of being excluded from the direct searches for the KK particles at the LHC This motivates us to move on to a less restricted version of oneUED with more parameters, namely the BLT parameters. In nmUED, BLT parameters give rise to modifications in the KK particle masses as well as interactions [60,61,62,63,64,65] The effect of such alterations is rather dramatic at the colliders as well as at the dark matter experiments.

COLLIDER PHENOMENOLOGY

Validation

Collider phenomenology

SUMMARY AND CONCLUSION