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

Kirtiman Ghosh (Institute of Physics, Bhubaneswar, India; Homi Bhabha National Institute, Mumbai, India) ; Durmus Karabacak (Mugla Sitki Kocman University, Faculty of Technology, Department of Energy Systems Engineering, Mugla, Turkey) ; S. Nandi (Department of Physics, Oklahoma Center for High Energy Physics, Oklahoma State University, Stillwater, USA; Department of Physics and Astronomy, Rice University, Houston, USA)

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 q1 and/or gluons g1) 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 13TeV 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 MD and the size of small extra dimensions R, in the light of above-mentioned ATLAS searches.

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      "value": "In the \u2018fat-brane\u2019 realization of Universal Extra Dimension (UED) models, the gravity mediated decays of Kaluza\u2013Klein (KK) excitations of the Standard Model (SM) particles offer interesting collider signals. Colored level-1 KK-particles (quarks <math><msup><mrow><mi>q</mi></mrow><mrow><mn>1</mn></mrow></msup></math> and/or gluons <math><msup><mrow><mi>g</mi></mrow><mrow><mn>1</mn></mrow></msup></math>) 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\u03b3 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 <math><mn>13</mn><mspace width=\"0.25em\"></mspace><mtext>TeV</mtext></math> center-of-mass energy. No significant excess of events above the SM expectation was observed in both searches. We constrain the \u2018fat-brane\u2019 UED model parameters, namely the fundamental Planck mass <math><msub><mrow><mi>M</mi></mrow><mrow><mi>D</mi></mrow></msub></math> and the size of small extra dimensions R, in the light of above-mentioned ATLAS searches."
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Published on:
03 December 2018
Publisher:
Elsevier
Published in:
Physics Letters B , Volume 788 C (2018)

Pages 388-395
DOI:
https://doi.org/10.1016/j.physletb.2018.11.035
Copyrights:
No information available
Licence:
CC-BY-3.0

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