Why should we care about the top quark Yukawa coupling?

Shapshnikov, Mikhail; Bezrukov, Fedor

doi:10.1134/S1063776115030152

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

Journal Article · Wed Apr 15 04:00:00 UTC 2015 · Journal of Experimental and Theoretical Physics

DOI: https://doi.org/10.1134/S1063776115030152 · OSTI ID:1201355

Shapshnikov, Mikhail ^[1]; Bezrukov, Fedor ^[2]

Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)
European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Connecticut, Storrs, CT (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1201355

Report Number(s):: BNL--108105-2015-JA

Journal Information:: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 3 Vol. 120; ISSN 1063-7761

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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