New Physics in ultraperipheral collisions at the LHC

S.I Godunov,E.V Zhemchugov,A.N Rozanov,V A Novikov,M.I Vysotsky

doi:10.1051/epjconf/201922204004

Abstract

We present a model-independent approach for New Physics searches in ultraperipheral collisions at the LHC. The case of long-lived charged particles is considered and it is shown that it is possible to find them even with the already available LHC data.

Highlights

Common situation in searching for SUSY particles can be described in the following way
Ultraperipheral collisions (UPC)1 provide us with a model-independent method of searching for new particles in photon fusion since photon coupling is universal being defined only by particle charge
We suggest to look for long-lived charged particles, for instance, quasistable charginos χ1 that exist in some SUSY scenarios

Summary

Introduction

Common situation in searching for SUSY particles can be described in the following way. No events found in the expected signal region so the limits are set on the fiducial cross section These limits are reinterpreted in the framework of the particular SUSY model to get bounds on particle masses and other model parameters. Where N is the colliding particle, nN(ω) is its equivalent photon spectrum, and production of charginos in photon fusion is described by the Breit-Wheeler cross section [20], σ(γγ. In case of UPC the event kinematics can be fully reconstructed by measuring the proton energies in forward detectors. Momenta of chargino candidates p1, p2 can be reconstructed from the tracks in the detector; final state protons can be detected by the forward detectors measuring ξ1, ξ2. Calculating this value for the events with two charged tracks and two protons in forward detectors one should obtain the delta-function at the chargino mass smeared with the detector resolution

Background

Conclusions