From deep-inelastic structure functions to two-photon dilepton production in proton-proton collisions

We compare two different approaches used for calculating cross sections for the two-photon \(p p \to l^+ l^- X\) process. In one of the approaches photon is treated as a collinear parton in the proton. In the second approach a recently proposed \(k_T\)-factorization method is used. In this presentat...

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Bibliographic Details
Published in:arXiv.org 2016-06
Main Authors: Szczurek, Antoni, Luszczak, Marta, Schaefer, Wolfgang
Format: Article
Language:English
Subjects:
Factorization
Mathematical analysis
Pair production
Parameterization
Particle collisions
Protons
Online Access:Get full text
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Summary:We compare two different approaches used for calculating cross sections for the two-photon \(p p \to l^+ l^- X\) process. In one of the approaches photon is treated as a collinear parton in the proton. In the second approach a recently proposed \(k_T\)-factorization method is used. In this presentation we discuss sensitivity of the results to the choice of structure function parametrization and experimental cuts in the \(k_T\)-factorization approach. We compare results of our calculations with recent experimental data for dilepton production and find that in most cases the contribution of the photon-photon mechanism is rather small. We discuss how to enhance the photon-photon contribution. We also compare our results to those of recent measurements of exclusive and semi-exclusive \(e^+ e^-\) pair production with certain experimental data by the CMS collaboration.
ISSN:2331-8422