Hyejung Stöckinger-Kim

The electroweak contributions to

The Higgs boson mass used to be the only unknown input parameter of the electroweak contributions to (g-2)_\mu\ in the Standard Model. It enters at the two-loop level in diagrams with e.g. top loops, W- or Z-exchange. We re-evaluate these contributions, providing analytic expressions and exact numerical results for the Higgs boson mass recently measured at the LHC. Our final result for the full Standard Model electroweak contributions is (153.6\pm1.0)*10^{-11}, where the remaining theory error comes from unknown three-loop contributions and hadronic uncertainties.

(g-2)_\mu

Abstract Two-loop contributions to the muon ( g − 2 ) from fermion/sfermion loops in the MSSM are presented, and an overview of the full MSSM prediction for ( g − 2 ) is given with emphasis on the behaviour in scenarios which are compatible with LHC data, including scenarios with large mass splittings. Compared to all previously known two-loop contributions, the fermion/sfermion loop contributions can yield the largest numerical results. The new contributions contain the important universal quantities Δα and Δρ, and for large sfermion masses the contributions are non-decoupling and logarithmically enhanced. We find up to 15 % ( 30 % ) corrections for sfermion masses in the 20 TeV (1000 TeV) range.

after the Higgs boson mass measurement

A bstractRecently, first results were presented for two-loop corrections to the muon (g−2) from fermion/sfermion loops in the MSSM. These corrections were shown to be generally large and even logarithmically enhanced for heavy sfermions. Here, full details of the calculation and analytical results are presented. Also, a very compact formula is provided which can be easily implemented and serves as a good approximation of the full result as a function of the fourteen most important input parameters. Finally, a thorough discussion of the numerical behaviour of the fermion/sfermion-loop corrections to (g−2)μ is given. The discussion includes the case of very heavy SUSY masses as well as experimentally allowed scenarios with very light SUSY masses.

Non-decoupling two-loop corrections to (g−2)μ from fermion/sfermion loops in the MSSM

Photonic SUSY two-loop corrections to the muon magnetic moment are contributions from diagrams where an additional photon loop is attached to a SUSY one-loop diagram. These photonic corrections are evaluated exactly, extending a leading-log calculation by Degrassi and Giudice. Compact analytical expressions are provided and the numerical behavior is discussed. The photonic corrections reduce the SUSY one-loop result by 7%-9%. The new terms are typically around 10 times smaller than the leading logarithms, but they can be larger and have either sign in cases with large SUSY mass splittings. We also provide details on renormalization and regularization and on how to incorporate the photonic corrections into a full SUSY two-loop calculation.

Two-loop corrections to the muon magnetic moment from fermion/sfermion loops in the MSSM: detailed results

We present GM2Calc, a public C++ program for the calculation of MSSM contributions to the anomalous magnetic moment of the muon,

GM2Calc: precise MSSM prediction for (g-2) of the muon

(g-2)_\mu

Large muon

(g-2)μ. The code computes