Probing Large Extra Dimensions Using Top Production in Photon-Photon Collisions
Prakash Mathews, P. Poulose, K. Sridhar (TIFR)
TL;DR
This paper investigates how large extra dimensions influence top quark pair production in photon-photon collisions, providing bounds on the quantum gravity scale and highlighting the benefits of polarization in experiments.
Contribution
It presents the first analysis of top production in photon-photon collisions to probe large extra dimensions and derives bounds on the quantum gravity scale M_S.
Findings
Bounds on M_S between 700 and 2400 GeV depending on energy
Polarization enhances the sensitivity of the bounds
Implications for experimental searches at NLC energies
Abstract
Theories with large extra dimensions predict an infinite tower of Kaluza-Klein states in the 1 TeV range, which can consequently have significant implications for experimental observables. One such observable, which gets affected by the exchange of spin-2 Kaluza-Klein particles, is the t t(bar) production cross-section in photon-photon collisions at NLC energies. We study this process and obtain bounds on the effective quantum gravity scale M_S between 700 and 2400 GeV (depending on the centre-of-mass energy). We show that the use of polarisation will further strengthen these bounds.
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