Matching coefficients for alpha_s and m_b to O(alpha_s^2) in the MSSM

Details Matching coefficients for alpha_s and m_b to O(alpha_s^2) in the MSSM Matching coefficients for alpha_s and m_b to O(alpha_s^2) in the MSSM

2008-10-28

arxiv.org/abs/0810.5101v2

JHEP 0902:037,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 5 figures

Scientific paper

10.1088/1126-6708/2009/02/037

We compute the exact two-loop matching coefficients for the strong coupling constant alpha_s and the bottom-quark mass m_b within the Minimal Supersymmetric Standard Model (MSSM), taking into account O(alpha_s^2) contributions from Supersymmetric Quantum Chromodynamics (SQCD). We find that the explicit mass pattern of the supersymmetric particles has a significant impact on the predictions of alpha_s and m_b at high energies. Further on, the three-loop corrections exceed the uncertainty due to the current experimental accuracy. In case of the the running bottom-quark mass, they can reach in the large tan(beta) regime up to 30% of the tree-level value.

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