Single-top-quark production in the t-channel at NNLO

被引：26

作者：

Campbell, John ^{[1
]}

Neumann, Tobias ^{[1
,2
,3
]}

Sullivan, Zack ^{[2
]}

机构：

[1] Fermilab Natl Accelerator Lab, Theoret Phys Dept, POB 500, Batavia, IL 60510 USA

[2] IIT, Dept Phys, Chicago, IL 60616 USA

[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 02期

基金：

美国能源部;

关键词：

NLO Computations; QCD Phenomenology; QCD CORRECTIONS; LEADING ORDER; PHOTON ENERGY; 2-LOOP RESULT; SOFT FUNCTION; JET; FACTORIZATION; DECAYS; CUT;

D O I：

10.1007/JHEP02(2021)040

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 present a calculation of t-channel single-top-quark production and decay in the five-flavor scheme at NNLO. Our results resolve a disagreement between two previous calculations of this process that found a difference in the inclusive cross section at the level of the NNLO coefficient itself. We compare in detail with the previous calculations at the inclusive, differential and fiducial level including b-quark tagging at a fixed scale mu = m(t). In addition, we advocate the use of double deep inelastic scattering (DDIS) scales (mu (2) = Q(2) for the light-quark line and mu (2) = Q(2) + mt2 for the heavy-quark line) that maximize perturbative stability and allow for robust scale uncertainties. All NNLO and NLO circle times NLO contributions for production and decay are included in the on-shell and vertex-function approximation. We present fiducial and differential results for a variety of observables used in Standard Model and Beyond Standard Model analyses, and find an important difference between the NLO and NNLO predictions of exclusive t + n-jet cross sections. Overall we find that NNLO corrections are crucial for a precise identification of the t-channel process.

引用

页数：41

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