Universal Extra Dimension models with gravity mediated decays after LHC Run II data

Ghosh, Kirtiman; Karabacak, Durmus; Nandi, S.

doi:10.1016/j.physletb.2018.11.035

Title: Universal Extra Dimension models with gravity mediated decays after LHC Run II data

Journal Article · Tue Jan 01 00:00:00 EST 2019 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2018.11.035· OSTI ID:1483138

; Karabacak, Durmus;

In the ‘fat-brane’ realization of Universal Extra Dimension (UED) models, the gravity mediated decays of Kaluza–Klein (KK) excitations of the Standard Model (SM) particles offer interesting collider signals. Colored level-1 KK-particles (quarks $q^1$ and/or gluons $g^1$) are pair-produced at the colliders due to conserved KK-parity. These particles, then, cascade decay into lighter level-1 KK-particle in association with one or more SM particles until producing lightest KK particle (LKP). The gravity mediation allows LKP to decay into photon or Z-boson plus gravity excitation, hence resulting in di-photon/ZZ/Zγ plus missing transverse energy signatures at collider experiments. Alternatively, pair-produced level-1 KK quarks/gluons may directly decay into the corresponding SM quark/gluon and a gravity excitation resulting in di-jet plus missing transverse energy signal. The ATLAS Collaboration has recently communicated the results for di-photon and multi-jet plus missing transverse energy searches with 36.1 inverse-femtobarn of integrated luminosity at center-of-mass energy. No significant excess of events above the SM expectation was observed in both searches. We constrain the ‘fat-brane’ UED model parameters, namely the fundamental Planck mass $$M_D$$ and the size of small extra dimensions R, in the light of above-mentioned ATLAS searches.

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Research Organization:: Oklahoma State Univ., Stillwater, OK (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0016013

OSTI ID:: 1483138

Alternate ID(s):: OSTI ID: 1612383

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 788 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 4 works

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