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Title: Why should we care about the top quark Yukawa coupling?

In the cosmological context, for the Standard Model to be valid up to the scale of inflation, the top quark Yukawa coupling y t should not exceed the critical value y t crit , coinciding with good precision (about 0.2‰) with the requirement of the stability of the electroweak vacuum. So, the exact measurements of y t may give an insight on the possible existence and the energy scale of new physics above 100 GeV, which is extremely sensitive to y t. In this study, we overview the most recent theoretical computations of and the experimental measurements of y t crit and the experimental measurements of y t. Within the theoretical and experimental uncertainties in y t, the required scale of new physics varies from 10⁷ GeV to the Planck scale, urging for precise determination of the top quark Yukawa coupling.
Authors:
 [1] ;  [2]
  1. Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Connecticut, Storrs, CT (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-108105-2015-JA
Journal ID: ISSN 1063-7761; R&D Project: PO-3
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 3; Journal ID: ISSN 1063-7761
Publisher:
Springer
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1201355