arXiv subjects

Konstantin G. Chetyrkin

Publications and source records attributed to Konstantin G. Chetyrkin.

3 recordsLinked to original sources

arXiv2026

A simple generalization of the low-energy theorem for the effective Higgs-gluon-gluon coupling for the case of simultaneous decoupling of several heavy quarks

We extend in an extremely simple and straightforward way the well-known low-energy theorem for an effective Higgs-like scalar-gluon-gluon coupling [1] (as well as a similar one for for the effective coupling of the Higgs-like field to the light scalar quark currents) in QCD including arbitrary number of heavy quarks in addition to the light ones. The application of the generalized low-energy theorem allows the extraction of the four-loop effective Higgs-gluon-gluon coupling valid for extensions of the Standard Model with additional heavy quarks from the 3-loop results of [2] for the decoupling constant of $α_s$.

hep-ph↗

arXiv2017

Addendum to arXiv:0907.2110: "Charm and Bottom Quark Masses: An Update"

We update the experimental moments for the charm quark as computed in arXiv:hep-ph/0702103. and used in arXiv:0907.2110 and arXiv:1010.6157 for the determination of the charm-quark mass. The new value for the MSbar charm-quark mass reads mc(3GeV)=0.993+/-0.008 GeV.

hep-ph↗

arXiv2015

Massive Tadpoles: Techniques and Applications

A brief discussion of massive tadpole diagrams and their phenomenological consequences is presented. This includes predictions of the $ρ$ parameter and, as a consequence, the mass of the $W$ boson, implications on the charm and bottom quark masses from the moments, i.e. the derivatives of the current correlators, and the Higgs boson decay rate. A fairly consistent picture emerges, with $m_c(3 {GeV})=0.986\pm0.013$ GeV and $m_b(m_b)=3.610\pm0.016$ GeV. Furthermore, fairly stringent predictions for the Higgs decay rate into photons and gluons are obtained, which will be interesting in increasingly precise experiments.

hep-ph↗