Abstract
Study of direct photon production in high-energy hadronic collisions provides a clean tool for testing the essential validity of perturbative quantum chromodynamics (PQCD) predictions as well as for constraining the gluon distribution of nucleons. These attractive considerations prompted us to study the characteristics of direct photons at CERN LHC energy $(\sqrt{s}=14\mathrm{TeV}).$ In order to validate our simulation results, we first describe the direct photon data at $\sqrt{s}=1.8\mathrm{TeV}$ in the central pseudorapidity $(\ensuremath{\eta})$ region. We used next-to-leading-order (NLO) QCD calculations and leading-order (LO) PYTHIA estimates with the latest parton distribution function, CTEQ5M1. At $\sqrt{s}=14\mathrm{TeV},$ the LO and NLO QCD predictions for direct photon cross section are presented as a function of transverse momentum of photon ${(p}_{T})$ in the kinematical region $20\mathrm{GeV}l{p}_{T}l400\mathrm{GeV}$ and $|\ensuremath{\eta}|l3.$ The sensitivity of the theoretical predictions to the choice of renormalization scales and gluon distributions is also demonstrated. The pseudorapidity $(\ensuremath{\eta})$ and cone size dependence of the direct photon cross section is also discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
