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Title: Top quark decay at next-to-leading order in the standard model effective field theory

Abstract

We consider top quark decay in the Standard Model Effective Field Theory (SMEFT). We present a calculation of the total decay width and the W-boson helicity fractions at next-to-leading order (NLO) in SMEFT. Our result includes the complete set of contributing four-fermion operators in addition to QCD dipole operators and bottom-mass suppressed effects. We show that operators that first appear at NLO in the SMEFT can be bounded by the current data as well as future data from both a high-luminosity LHC and a potential e+e collider, demonstrating the importance of going beyond leading order when studying the SMEFT. We discuss technical aspects of our calculation that we believe will be useful in future higher-order studies of the SMEFT, in particular the treatment of γ5 in loop diagrams.

Authors:
; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
OSTI Identifier:
1567865
Alternate Identifier(s):
OSTI ID: 1574364
Grant/Contract Number:  
AC02-06CH11357; FG02-91ER40684
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 5; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Boughezal, Radja, Chen, Chien-Yi, Petriello, Frank, and Wiegand, Daniel. Top quark decay at next-to-leading order in the standard model effective field theory. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.056023.
Boughezal, Radja, Chen, Chien-Yi, Petriello, Frank, & Wiegand, Daniel. Top quark decay at next-to-leading order in the standard model effective field theory. United States. doi:10.1103/PhysRevD.100.056023.
Boughezal, Radja, Chen, Chien-Yi, Petriello, Frank, and Wiegand, Daniel. Mon . "Top quark decay at next-to-leading order in the standard model effective field theory". United States. doi:10.1103/PhysRevD.100.056023.
@article{osti_1567865,
title = {Top quark decay at next-to-leading order in the standard model effective field theory},
author = {Boughezal, Radja and Chen, Chien-Yi and Petriello, Frank and Wiegand, Daniel},
abstractNote = {We consider top quark decay in the Standard Model Effective Field Theory (SMEFT). We present a calculation of the total decay width and the W-boson helicity fractions at next-to-leading order (NLO) in SMEFT. Our result includes the complete set of contributing four-fermion operators in addition to QCD dipole operators and bottom-mass suppressed effects. We show that operators that first appear at NLO in the SMEFT can be bounded by the current data as well as future data from both a high-luminosity LHC and a potential e+e– collider, demonstrating the importance of going beyond leading order when studying the SMEFT. We discuss technical aspects of our calculation that we believe will be useful in future higher-order studies of the SMEFT, in particular the treatment of γ5 in loop diagrams.},
doi = {10.1103/PhysRevD.100.056023},
journal = {Physical Review D},
number = 5,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.056023

Citation Metrics:
Cited by: 2 works
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