Three-loop corrections to the mass of the light Higgs boson in the MSSM

TL;DR

This paper calculates three-loop SUSY-QCD corrections to the light Higgs boson mass in the MSSM, significantly reducing theoretical uncertainties and aligning with LHC precision expectations.

Contribution

It provides the first three-loop calculation of SUSY-QCD corrections to the Higgs mass in the MSSM, improving prediction accuracy.

Findings

Three-loop corrections can shift the Higgs mass by about one GeV.

Reduced dependence on renormalisation scheme enhances prediction stability.

The results are relevant for LHC precision measurements.

Abstract

The Minimal Supersymmetric extension of the Standard Model (MSSM) predicts the existence of a light neutral Higgs boson. Once found at the LHC, its mass will immediately become a precision observable. The theoretical value of the Higgs mass Mh is subject to large radiative corrections. Due to the large top Yukawa coupling, loops of top quarks and their superpartners provide the dominant contribution to the radiative corrections. We present a calculation of the SUSY-QCD corrections to these diagrams, up to the three-loop order. We find that our three-loop results can be in the range of one GeV, and are thus relevant when compared with the expected experimental accuracy at the LHC. We also find a significantly reduced dependency on the renormalisation prescription, thus decreasing the theoretical uncertainty of the prediction of Mh.