The impact of the photon PDF and electroweak corrections on t(t)over-bar distributions

被引：0
|
作者：
Pagani, D. [1 ]
Tsinikos, I. [1 ]
Zaro, M. [2 ,3 ]
机构：
[1] Catholic Univ Louvain, Ctr Cosmol Particle Phys & Phenomenol CP3, Chemin Cyclotron 2, B-1348 Louvain La Neuve, Belgium
[2] Univ Paris 06, Sorbonne Univ, UMR 589, LPTHE, F-75005 Paris, France
[3] CNRS, UMR 7589, LPTHE, F-75005 Paris, France
来源：
EUROPEAN PHYSICAL JOURNAL C | 2016年 / 76卷 / 09期
关键词：
QUARK PAIR PRODUCTION; HADRON COLLIDERS; PARTON DISTRIBUTIONS; QED CORRECTIONS; CROSS-SECTION; RESUMMATION; LHC;
D O I：
10.1140/epjc/s10052-016-4318-z
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We discuss the impact of EW corrections on differential distributions in top-quark pair production at the LHC and future hadron colliders, focussing on the effects of initial-state photons. Performing a calculation at Next-to-Leading Order QCD+EW accuracy, we investigate in detail the impact of photon-initiated channels on central values as well as PDF and scale uncertainties, both at order alpha(s)alpha and alpha(2)(s)alpha. We present predictions at 13 and 100TeV, and provide results for the 8TeV differential measurements performed by ATLAS and CMS. A thorough comparison of results obtained with the NNPDF2.3QED and CT14QED PDF sets is performed. While contributions due to the photon PDF are negligible with CT14QED, this is not the case for NNPDF2.3QED, where such contributions are sizeable and show large PDF uncertainties. On the one hand, we show that differential observables in top-pair production, in particular top-quark and t (t) over bar rapidities, can be used to improve the determination of the photon PDF within the NNPDF approach. On the other hand, with current PDF sets, we demonstrate the necessity of including EW corrections and photon-induced contributions for a correct determination of both the central value and the uncertainties of theoretical predictions.
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页数：20
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