Polarized top pair production in extra dimension models via photon-photon fusion at the CERN LHC

Abstract

We study the potential of processes pp ! pp ! pt " tp in scenarios of the Arkani-Hamed-Dimopoulos-Dvali and the Randall-Sundrum model at the LHC. We obtain 95% C.L. bounds on the model parameters. We show top quark spin asymmetry can be detected and discerned from the standard model with these extra dimensional models.

Probe of extra dimensions in gamma q->gamma q at the LHC

“…The potential of γγ processes at the LHC to probe large and warped extra dimensions was investigated in Refs. [27,32,39] by some of the authors of this work. In these earlier papers the processes pp → pγγp → pℓ + ℓ − p [27], pp → pγγp → pγγp [32] and pp → pγγp → pt tp [39] were considered and the bounds on model parameters of ADD and RS models were obtained.…”

“…[27,32,39] by some of the authors of this work. In these earlier papers the processes pp → pγγp → pℓ + ℓ − p [27], pp → pγγp → pγγp [32] and pp → pγγp → pt tp [39] were considered and the bounds on model parameters of ADD and RS models were obtained. In our present paper we have probed the large and warped extra dimensions via γq → γq subprocess in a quasireal photon-proton deep inelastic scattering at the LHC.…”

Probe of extra dimensions inγq→γqat the LHC

“…pp ! pt " tp [39] were considered, and the bounds on model parameters of the ADD and RS models were obtained. In our present paper, we have probed the large and warped extra dimensions via the q !…”

Probe of the electromagnetic moments of the tau lepton in gamma-gamma collisions at the CLIC

“…γ * γ * processes can be described by equivalent photon approximation, i.e. using the Weizsacker-Williams approximation [19,[59][60][61][62][63][64][65][66][67][68][69][70]. Such processes have experimentally observed at the LEP, Tevatron and LHC [71][72][73][74][75][76][77].…”