Study of weak corrections to Drell-Yan, top-quark pair, and dijet production at high energies with MCFM

Journal Article · 29 November 2016 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.94.093009 · OSTI ID:1331121

Campbell, John M.  ^[1]; Wackeroth, Doreen ^[2]; Zhou, Jia ^[3]

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1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); The State Univ. of New York, Buffalo, NY (United States)
3. The State Univ. of New York, Buffalo, NY (United States)

Electroweak (EW) corrections can be enhanced at high energies due to the soft or collinear radiation of virtual and real W and Z bosons that result in Sudakov-like corrections of the form α$$l\atop{W}$$logⁿ(Q²/M2$$\atop{W,Z}$$), where α_W=α/(4π sin²θ_W) and n ≤ 2l-1. The inclusion of EW corrections in predictions for hadron colliders is, therefore, especially important when searching for signals of possible new physics in distributions probing the kinematic regime Q²>>M$$2\atop{V}$$. Next-to-leading order (NLO) EW corrections should also be taken into account when their size [O(α)] is comparable to that of QCD corrections at next-to-next-to-leading order (NNLO) [O(α$$2\atop{s}$$)]. To this end, we have implemented the NLO weak corrections to the neutral-current Drell-Yan process, top-quark pair production and dijet production in the parton-level Monte Carlo program MCFM. This enables a combined study with the corresponding QCD corrections at NLO and NNLO. We provide both the full NLO weak corrections and their Sudakov approximation since the latter is often used for a fast evaluation of weak effects at high energies and can be extended to higher orders. Finally, with both the exact and approximate results at hand, the validity of the Sudakov approximation can be readily quantified.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1331121
• Alternate ID(s): OSTI ID: 1333767
• Report Number(s): FERMILAB-PUB-16-314-T; arXiv:1608.03356; PRVDAQ; 1480864
• Journal Information: Physical Review D, Vol. 94, Issue 9; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English