Forward Physics with the CMS Experiment at LHC

D Sunar Cerci,L Bravina,Y Foka,S Kabana

doi:10.1051/epjconf/201716407014

Abstract

Forward physics measurements with the Compact Muon Solenoid (CMS) experiment, one of the two large multi-purpose experiments at the Large Hadron Collider (LHC) at CERN, cover a wide range of physics subjects. The forward calorimeters of CMS, HF and CASTOR, are used to collect data up to a pseudo-rapidity of 6.6. These detectors provide sensitivity to a large part of the total inelastic cross section, including diffractive events that produce particles only at forward rapidity, with the exception of very low mass diffraction. The results obtained with a centre-of-mass energy of 13 TeV are presented. The measurements are compared to model predictions and provide valuable input for tuning of Monte Carlo models used to describe high-energy hadronic interactions.

Highlights

Tphe Large Hadron Collider (LHC) at CERN has started to deliver proton-proton collisions at the highest energy of s = 13 TeV ever reached by any other accelerator since 2015
The forward physics programme at Compact Muon Solenoid (CMS) mainly focuses on the physics that can be reached with the forward detectors HF and CASTOR at 3.0 < |⌘| < 5.2 and −6.6 < ⌘ < −5.2, respectively
Measurements in the forward region can be used to improve the knowledge of the content of the proton at small values of the momentum fraction x carried by the partons and to provide inputs for parton density functions (PDFs)

Summary

Introduction

The CMS detector [1]. At the LHC is a suitable machine which provides the opportunity to study forward physics. The forward physics programme at CMS mainly focuses on the physics that can be reached with the forward detectors HF and CASTOR at 3.0 < |⌘| < 5.2 and −6.6 < ⌘ < −5.2, respectively. Measurements in the forward region can be used to improve the knowledge of the content of the proton at small values of the momentum fraction x carried by the partons and to provide inputs for parton density functions (PDFs). Measurements performed in the forward region can shed light on MPI and the underlying events (UE) as well as provide useful information on the tuning of Monte Carlo (MC) event generators available

Inelastic pp cross section

Forward energy flow and transverse energy density

Pseudorapidity distributions of charged-particles

Energy distribution in the very forward direction

Very forward inclusive jet cross section