  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/$ZZ$/$Z\gamma$ 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 $13$ TeV 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.
