München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 17: Beyond The Standard Model (Theorie) 1

T 17.6: Talk

Wednesday, March 11, 2009, 18:05–18:20, M114

Matching coefficients for the strong coupling constant and the bottom quark mass to O(α_s²) in the MSSM — Andreas Bauer, Luminita Mihaila, •Jens Salomon, and Matthias Steinhauser — Institut für Theoretische Teilchenphysik (TTP), 76128 Karlsruhe, Germany

We compute the exact two-loop matching coefficients for the strong coupling constant α_s and the bottom quark mass m_b within the Minimal Supersymmetric Standard Model (MSSM), taking into account O(α_s²) contributions from Supersymmetric Quantum Chromodynamics. We find that the explicit mass pattern of the supersymmetric particles has a significant impact on the predictions of α_s and m_b at high energies. Further on, the three-loop corrections are comparable to or even exceed the uncertainty due to the current experimental accuracy. In case of the the running bottom quark mass, they can reach in the large tanβ regime up to 30% of the tree-level value.