Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 40: Experimental methods II

T 40.3: Talk

Tuesday, March 16, 2021, 16:30–16:45, To

Direct-photon plus jets production in Powheg — •Yanwen Hong, Thomas Peiffer, Arnulf Quadt, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

Photons and photons-plus-jets production play an important role in high-energy collisions. Theoretical predictions for final-state photon production in pp, pPb, and PbPb collisions have been available at leading order (LO) and next-to-leading-order (NLO), and have been implemented in Monte Carlo generators like Sherpa. For direct-photon production, NLO samples are available only with the Sherpa generator and have been shown to provide a good description of data. An alternative sample, generated using the matrix element Monte Carlo generator Powheg, would help to provide an estimate of the systematic uncertainties in the modelling and to have a better understanding of these final states. The talk covers the following. A setup at NLO using the Powheg direct-photon process is studied. Configuration for di-photon plus jets samples with MadGraph5 interfaced with Pythia8 at NLO using the FxFx merging scheme is prepared, and a validation against the Sherpa setup and unfolded data using Rivet is performed. Finally, the effects of changing certain MC parameters and merging scale variations are studied.