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

Journal Article · · Physical Review D
 [1];  [2];  [3]; ORCiD logo [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). HEP Div.
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Physics & Astronomy
  3. Argonne National Lab. (ANL), Argonne, IL (United States). HEP Div.; Northwestern Univ., Evanston, IL (United States). Dept. of Physics & Astronomy

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-06CH11357; FG02-91ER40684
OSTI ID:
1567865
Alternate ID(s):
OSTI ID: 1574364
Journal Information:
Physical Review D, Vol. 100, Issue 5; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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