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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{sub t} should not exceed the critical value y{sub t}{sup crit}, coinciding with good precision (about 0.2‰) with the requirement of the stability of the electroweak vacuum. So, the exact measurements of y{sub 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{sub t}. We overview the most recent theoretical computations of and the experimental measurements of y{sub t}{sup crit} and the experimental measurements of y{sub t}. Within the theoretical and experimental uncertainties in y{sub t}, the required scale of new physics varies from 10{sup 7} GeV to the Planck scale, urging for precise determination of the top quark Yukawa coupling.
Authors:
 [1] ;  [2]
  1. CERN (Switzerland)
  2. École Polytechnique Fédérate de Lausanne, Institut de Théorie des Phénomenes Physiques (Switzerland)
Publication Date:
OSTI Identifier:
22472382
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CALCULATION METHODS; COUPLING; ELECTROMAGNETIC INTERACTIONS; GEV RANGE; INFLATIONARY UNIVERSE; STANDARD MODEL; T QUARKS; VACUUM STATES; WEAK INTERACTIONS; YUKAWA POTENTIAL