Work

The two-loop electroweak bosonic corrections to sin2θeffb

Year: 2016

Type: article

Abstract: The prediction of the effective electroweak mixing angle sin 2 ⁡ θ eff b in the Standard Model at two-loop accuracy has now been completed by the first calculation of the bosonic two-loop corrections to the Z b ¯ b vertex. Numerical predictions are presented in the form of a fitting formula as function of M Z , M W , M H , m t and Δ α , α s . For central input values, we obtain a relative correction of Δ κ b ( α 2 , bos ) = − 0.9855 × 10 − 4 , amounting to about a quarter of the fermionic corrections, and corresponding to sin 2 ⁡ θ eff b = 0.232704 . The integration of the corresponding two-loop vertex Feynman integrals with up to three dimensionless parameters in Minkowskian kinematics has been performed with two approaches: (i) Sector decomposition, implemented in the packages FIESTA 3 and SecDec 3 , and (ii) Mellin–Barnes representations, implemented in AMBRE 3/MB and the new package MBnumerics .

Source: Physics Letters B

DOI: 10.1016/j.physletb.2016.09.012

Authors: Ievgen Dubovyk, Ayres Freitas, Janusz Gluza, Tord Riemann, Johann Usovitsch

Institutions: Universität Hamburg, University of Pittsburgh, University of Silesia in Katowice, Humboldt-Universität zu Berlin

Language: Latvian

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond