具有实际光子隔离的NNLO光子产生

Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2022) Pub Date : 2022-08-04 DOI:10.22323/1.416.0034

Robin Schuermann, Xuan Chen, T. Gehrmann, N. Glover, M. Höfer, A. Huss

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引用次数: 3

摘要

强子对撞机的孤立光子产生是通过直接产生和碎片化过程进行的。对孤立光子和光子加射流截面的理论预测通常施加理想化的光子隔离标准，消除了碎片的贡献，并在与数据的比较中引入了系统的不确定性。我们提出了基于实验隔离的光子加射流截面的NNLO预测，包括直接贡献和碎片贡献。比较了两种不同的部分-光子碎片函数的预测，允许对来自唯一松散约束的光子碎片函数的不确定性进行估计。

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NNLO Photon Production with Realistic Photon Isolation

Isolated photon production at hadron colliders proceeds via direct production and fragmentation processes. Theory predictions for the isolated photon and photon-plus-jet cross section often impose idealised photon isolation criteria, eliminating the fragmentation contribution and introducing a systematic uncertainty in the comparison to data. We present NNLO predictions for the photon-plus-jet cross section with the experimental isolation including both, direct and fragmentation contributions. Predictions with two different parton-to-photon fragmentation functions are compared, allowing for an estimation of the uncertainty stemming from the only loosely constrained photon fragmentation functions.

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Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2022)

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