Single jet and prompt-photon inclusive production with multi-Regge kinematics: From Tevatron to LHC

TL;DR

This paper investigates single jet and prompt-photon production at high energies using multi-Regge kinematics and Reggeized partons, achieving good agreement with experimental data from Tevatron and LHC without free parameters.

Contribution

It introduces a novel approach employing Reggeized gluons and quarks for high-energy hadroproduction, matching experimental results without parameter tuning.

Findings

Good agreement with Tevatron and LHC data in specified kinematic regions.

Effective use of unintegrated parton distributions derived from collinear PDFs.

Validation of multi-Regge kinematics approach at high energies.

Abstract

We study single jet and prompt-photon inclusive hadroproduction with multi-Regge kinematics invoking the hypothesis of parton Reggeization in t-channel exchanges at high energy. In this approach, the leading contributions are due to the fusion of two Reggeized gluons into a Yang-Mills gluon and the annihilation of a Reggeized quark-antiquark pair into a photon, respectively. Adopting the Kimber-Martin-Ryskin and Bluemlein prescription to derive unintegrated gluon and quark distribution functions of the proton from their collinear counterparts, for which we use the Martin-Roberts-Stirling-Thorne set, we evaluate cross section distributions in transverse momentum (p_T) and rapidity. Without adjusting any free parameters, we find good agreement with measurements by the CDF and D0 Collaborations at the Tevatron and by the ATLAS Collaboration at the LHC in the region 2p_T/sqrt{S} < 0.1, where sqrt{S} is the hadronic c.m. energy.