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Title: Off-shell single-top-quark production in the Standard Model Effective Field Theory

Abstract

We present a fully differential and spin-dependent t-channel single-top-quark calculation at next-to-leading order (NLO) in QCD including off-shell effects by using the complex mass scheme in the Standard Model (SM) and in the Standard Model Effective Field Theory (SMEFT). We include all relevant SMEFT operators at 1/Λ$$^{2}$$ that contribute at NLO in QCD for a fully consistent comparison to the SM at NLO. In addition, we include chirality flipping operators that do not interfere with the SM amplitude and contribute only at 1/Λ$$^{4}$$ with a massless b-quark. Such higher order effects are usually captured by considering anomalous right-handed Wtb and left-handed Wtb tensor couplings. Despite their formal suppression in the SMEFT, they describe an important class of models for new physics. Our calculation and analysis framework is publicly available in MCFM.

Authors:
ORCiD logo [1];  [2]
  1. Illinois Institute of Technology, Chicago, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Illinois Institute of Technology, Chicago, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1527398
Report Number(s):
arXiv:1903.11023; FERMILAB-PUB-19-119-T; IIT-CAPP-19-01
Journal ID: ISSN 1029-8479; 1726755
Grant/Contract Number:  
AC02-07CH11359; SC0008347
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 6; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QCD Phenomenology; NLO Computations

Citation Formats

Neumann, Tobias, and Sullivan, Zack Edward. Off-shell single-top-quark production in the Standard Model Effective Field Theory. United States: N. p., 2019. Web. doi:10.1007/JHEP06(2019)022.
Neumann, Tobias, & Sullivan, Zack Edward. Off-shell single-top-quark production in the Standard Model Effective Field Theory. United States. doi:10.1007/JHEP06(2019)022.
Neumann, Tobias, and Sullivan, Zack Edward. Fri . "Off-shell single-top-quark production in the Standard Model Effective Field Theory". United States. doi:10.1007/JHEP06(2019)022. https://www.osti.gov/servlets/purl/1527398.
@article{osti_1527398,
title = {Off-shell single-top-quark production in the Standard Model Effective Field Theory},
author = {Neumann, Tobias and Sullivan, Zack Edward},
abstractNote = {We present a fully differential and spin-dependent t-channel single-top-quark calculation at next-to-leading order (NLO) in QCD including off-shell effects by using the complex mass scheme in the Standard Model (SM) and in the Standard Model Effective Field Theory (SMEFT). We include all relevant SMEFT operators at 1/Λ$^{2}$ that contribute at NLO in QCD for a fully consistent comparison to the SM at NLO. In addition, we include chirality flipping operators that do not interfere with the SM amplitude and contribute only at 1/Λ$^{4}$ with a massless b-quark. Such higher order effects are usually captured by considering anomalous right-handed Wtb and left-handed Wtb tensor couplings. Despite their formal suppression in the SMEFT, they describe an important class of models for new physics. Our calculation and analysis framework is publicly available in MCFM.},
doi = {10.1007/JHEP06(2019)022},
journal = {Journal of High Energy Physics (Online)},
number = 6,
volume = 2019,
place = {United States},
year = {2019},
month = {6}
}

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Cited by: 3 works
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