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T: Fachverband Teilchenphysik

T 10: QCD / Elektroschwache Physik (Theorie) 1

T 10.8: Talk

Monday, March 4, 2013, 12:45–13:00, WIL-A120

EWSB quantification by higher order Higgs-gluon coupling operators — •Tobias Neumann and Robert Harlander — Bergische Universität Wuppertal

In Higgs production by gluon fusion one usually takes the limit of an infinitely heavy top quark to reduce the number of loops in calculations by one, as the leading order cross section is already a one-loop calculation. Recently we confirmed the quality of the heavy top limit in differential Higgs production by looking at higher order corrections in the top mass O(1/m_t²). We did this by using asymptotic expansions in the top mass. One can also take the approach of writing down dimension 7 Higgs-gluon coupling operators and calculating the SM matching coefficients. By not fixing the coefficients of the dimension 7 operators to their matched SM values, we can quantify EWSB in a quite general way. As we will see, terms suppressed by 1/Λ², where Λ is the scale of new physics, can give visible SM deviations and allow us to detect BSM physics and possibly match it to specific models.