https://doi.org/10.1140/epjc/s10052-016-4264-9
Regular Article - Theoretical Physics
Lightest Kaluza–Klein graviton mode in a back-reacted Randall–Sundrum scenario
1
Department of Physics, Indian Institute of Technology, North Guwahati, Guwahati, Assam, 781039, India
2
Department of Theoretical Physics, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata, 700 032, India
* e-mail: tpssg@iacs.res.in
Received:
2
June
2016
Accepted:
12
July
2016
Published online:
28
July
2016
In search of the extra dimensions in the ongoing LHC experiments, the signatures of the Randall–Sundrum (RS) lightest KK graviton have been in the main focus in recent years. The recent data from the dilepton decay channel at the LHC has determined the experimental lower bound on the mass of the RS lightest Kaluza–Klein (KK) graviton for different choices of the underlying parameters of the theory. In this work we explore the effects of the back-reaction of the bulk scalar field, which is employed to stabilise the RS model, in modifying the couplings of the lightest KK graviton with the standard model matter fields located on the visible brane. In such a modified background geometry we show that the coupling of the lightest KK graviton with the SM matter fields gets a significant suppression due to the inclusion of the back-reaction of the bulk stabilising scalar field. This implies that the back-reaction parameter weakens the signals from the RS scenario in collider experiments, which in turn explains the non-visibility of KK graviton in colliders. Thus we show that the modulus stabilisation plays a crucial role in the search of warped extra dimensions in collider experiments.
© The Author(s), 2016
