Repository logo
 

Precise determination of the neutral Higgs boson masses in the MSSM

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Allanach, BC 
Djouadi, A 
Kneur, JL 
Porod, W 
Slavich, P 

Abstract

We present the implementation of the radiative corrections of the Higgs sector in three public computer codes for the evaluation of the particle spectrum in the Minimal Supersymmetric Standard Model, Softsusy, Spheno and SuSpect. We incorporate the full one-loop corrections to the Higgs boson masses and the electroweak symmetry breaking conditions, as well as the two-loop corrections controlled by the strong gauge coupling and the Yukawa couplings of the third generation fermions. We include also the corrections controlled by the tau Yukawa coupling that we derived for completeness. The computation is consistently performed in the DRbar renormalisation scheme. In a selected number of MSSM scenarios, we study the effect of these corrections and analyse the impact of some higher order effects. By considering the renormalisation scheme and scale dependence, and the effect of the approximation of zero external momentum in the two-loop corrections, we estimate the theoretical uncertainty on the lighter Higgs boson mass to be 3 to 5 GeV. The uncertainty on Mh due to the experimental error in the measurement of the SM input parameters is approximately of the same size. Finally, we discuss the phenomenological consequences, using the latest value of the top quark mass. We find, in particular, that the most conservative upper bound on the lighter Higgs boson mass in the general MSSM is Mh < 152 GeV and that there is no lower bound on the parameter tan(beta) from non-observation of the MSSM Higgs bosons at LEP2.

Description

Keywords

supersymmetry phenomenology, supersymmetric standard model, Higgs physics, SUPERSYMMETRIC STANDARD MODEL, ELECTROWEAK SYMMETRY-BREAKING, INFRARED FIXED-POINTS, RADIATIVE-CORRECTIONS, TAN-BETA, LOCAL SUPERSYMMETRY, 2-LOOP CORRECTIONS, QCD CORRECTIONS, E+E COLLIDERS, MIXING ANGLE

Journal Title

J HIGH ENERGY PHYS

Conference Name

Journal ISSN

1126-6708
1029-8479

Volume Title

8

Publisher

Springer Science and Business Media LLC