On transverse energy production in hadron collisions

TL;DR

This paper calculates the transverse energy spectrum in proton-antiproton collisions at 540 GeV to next-to-leading order and compares it with experimental data, highlighting the importance of all-order effects and hadronization.

Contribution

It provides a next-to-leading order calculation of the transverse energy spectrum and emphasizes the significance of all-order effects and hadronization in matching experimental data.

Findings

The calculated spectrum matches data only at high transverse energy (Et=60 GeV).

Perturbative calculations alone do not reproduce the data at lower energies.

Monte Carlo simulations with HIJING agree well with experimental results.

Abstract

The transverse energy spectrum in the unit rapidity window in p-bar p collisions at 540 GeV c.m.s energy is calculated to the next-to-leading order accuracy O(a_s^3) and compared to the experimental data by UA(2) collaboration. We show that the calculated spectrum starts matching experimental data only at relatively large transverse energy Et=60 GeV and is in essential disagreement with it both in shape and magnitude at lower transverse energies. The data are well reproduced by HIJING Monte-Carlo generator indicating the crucial importance of all-order effects in perturbation theory as well as those of hadronization in describing the transverse energy production in hadron collisions at small and intermediate transverse energies.