Next-to-Leading-Order Monte Carlo Simulation of Diphoton Production in Hadronic Collisions

TL;DR

This paper introduces a new NLO Monte Carlo simulation method for diphoton production in hadronic collisions, combining parton showers with NLO calculations to improve accuracy and positivity of event weights.

Contribution

The paper develops a positive weight NLO matching algorithm (POWHEG) specifically for diphoton production, integrating fragmentation and soft emission effects.

Findings

Successful implementation of the POWHEG method for diphoton production.

Simulation produces only positive event weights, improving computational stability.

Includes full treatment of photon fragmentation and soft emissions.

Abstract

We present a method, based on the positive weight next-to-leading-order matching formalism (POWHEG), to simulate photon production processes at next-to-leading-order (NLO). This technique is applied to the simulation of diphoton production in hadron-hadron collisions. The algorithm consistently combines the parton shower and NLO calculation, producing only positive weight events. The simulation includes both the photon fragmentation contribution and a full implementation of the truncated shower required to correctly describe soft emissions in an angular-ordered parton shower.