Tests of the quark-line rule for theη−η′complex

1977 ◽  
Vol 15 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Susumu Okubo ◽  
Kannan Jagannathan
Keyword(s):  
Quark Line

scholarly journals Non-Duality of Pomeranchon Term and Quark Line Picture

1970 ◽  
Vol 44 (2) ◽  
pp. 551-553 ◽  
Author(s):  
Toshihiro Yoshida
Keyword(s):  
Quark Line

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

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
John Campbell ◽  
Tobias Neumann ◽  
Zack Sullivan
Keyword(s):  
Standard Model ◽  
Cross Sections ◽  
Top Quark ◽  
Light Quark ◽  
Inclusive Cross Section ◽  
Single Top ◽  
Top Quark Production ◽  
Quark Production ◽  
Jet Cross Sections ◽  
Quark Line

Abstract 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 μ = mt. In addition, we advocate the use of double deep inelastic scattering (DDIS) scales (μ2 = Q2 for the light-quark line and μ2 = Q2 + $$ {m}_t^2 $$ m t 2 for the heavy-quark line) that maximize perturbative stability and allow for robust scale uncertainties. All NNLO and NLO⊗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.

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