Constraining the dipole moments of the top quark

By Jernej F. Kamenik, A. Weiler. 2011

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DESY, Notkestrasse 85, D-22603 Hamburg, Germany(Dated: July 18, 2011)We investigate the direct and indirect bounds on dipole operators involving the top quark. Acareful analysis shows that the experimental upper limit on the neutron electric dipole momentstrongly constrains the chromo-electric dipole of the top. We improve previous bounds by twoorders of magnitude. This has signi cant implications for new physics models and it also meansthat CP violation in top pair production mediated by dipole operators will not be accessible at theLHC. The CP conserving chromo-magnetic dipole moments are constrained by recent measurementsof the ttspectrum by the ATLAS collaboration. We also update the indirect constraints on electricand magnetic dipole moments from radiative b! stransitions, nding that they can be considerablylarger than their colored counterparts.Introduction

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b7999ec9ac402b390b8d411b191915ce469b5b58

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In Nuclear and High Energy Physics

Citations in the corpus

Constraints on CP-violating Higgs couplings to the third generation (2013, methodology): “J H E P 1 1 ( 2 0 1 3 ) 1 8 0 The contributions of the EDM, CEDM, and Weinberg operators to the neutron EDM are then given by [26] (see also [34, 35])”
The universal Higgs fit (2013, methodology): “The uncertainty on kt is comparable to the one from its direct measurements at the LHC and the Tevatron as combined in [87], while the one for gt is even smaller.”
Electroweak constraints on flavorful effective theories (2015, methodology): “A dedicate analysis for the EW and rare K and B decays on ttZ vertex coupling can be found in [64], while direct and indirect constraints on top dipole moments are given in [65].”
Effective Lagrangian for a light Higgs-like scalar (2013, methodology): “Among the heavier quarks the most interesting bounds are those on dipole operators with top quarks [41].”