FeynHiggs is a Fortran code for the diagrammatic calculation of the masses of the neutral CP-even Higgs bosons in the MSSM at the two-loop level.

The code is explained in hep-ph/9812320.

The calculation is based on hep-ph/9803277 and hep-ph/9807423 by S. Heinemeyer, W. Hollik and G. Weiglein.

See also hep-ph/9812472 for details.

The approximation formulas (also used in FeynHiggsFast) are given in hep-ph/9903404.

For details about the new renormalization at the one-loop level (see update on Sep. 24th 2001) see hep-ph/0202166 by by M. Frank, S. Heinemeyer, W. Hollik and G. Weiglein.

More information about the NMFV models implemented into FeynHiggs, see hep-ph/0210335 by A. Curiel, M. Herrero and D. Temes (and references therein).

A bug in the DRbar to OS transition (with iteration) for the sbottom sector has been removed (thanks to Jean-Luc Kneur and Pietro Slavich).

The subroutine 'phi' for the two-loop calculation has been made 'safer' against instabilities.

The evaluation of the leading corrections coming from NMFV models are included (parameterized by the new input parameter lambda_t)

The transition from DRbar to on-shell for the stop and sbottom masses have been extended to include (besides the O(alpha

Another bug in the O(alpha

A bug in the O(alpha

The remaining O(alpha

Furthermore now routines for the SUSY contribution to g-2 of the muon and the evaluation of BR(b -> s gamma) is contained in the code for further cross checks.

A bug in the routine for the pole mass search has been fixed. For very low M

All major recent changes are summarized in hep-ph/0212020 (G. Degrassi, S. Heinemeyer, W. Hollik, P. Slavich and G. Weiglein).

The remaining O(alpha

The presumably leading O(alpha

The renormalization scale for the subleading one-loop corrections entering via delta tan beta and for the O(alpha

The two-loop O(alpha

Some common blocks have been renamed to make the inclusion of FeynHiggs into other codes easier.

The two-loop O(alpha

tan beta enhanced two-loop QCD corrections have been implemented, following the effective Lagrangian approach given in hep-ph/9912516 (M. Carena, D. Garcia, U. Nierste, C. Wagner) have been implemented, including their resummation to all orders (thanks go to Ulrich Nierste!).

The

The

Bug in the approximation formula fixed: wrong result was produced if the new non-logarithmic O(alpha

Inclusion of the non-logarithmic O(alpha

The renormalization at the one-loop level has been modified. In particular, an MSbar renormalization for tan beta has been used (at the scale m

The new version corresponds to the one used for the LEP benchmark scans. (Results obtained with FeynHiggs are given here.) It furthermore contains the evaluation the effective mixing angle of the CP-even Higgs sector as well as the calculation of the mass of the charged Higgs boson at the 1-loop level.

Another new feature is the possibility of using MSbar parameters as input parameters. According to hep-ph/0001002 (where an approximation of the relevant formulas is presented) the MSbar parameters are transformed into On-Shell parameters, which are then used for the calculation within FeynHiggs.

A (numerical irrelevant) bug in Hhmasssr.f has been fixed. The control letters (a remnant from the old DOS times) have been removed.

Pure Yukawa calculation from the top/stop sector added, so possilbe numerical instabilities due to thresholds can be detected.

One-loop bottom/sbottom sector stabilized (non perturbative regime with large tan(beta) and large |mue| corrected.)

Some Fortran bugs fixed. Compilation should be more stable now :-)

Calculation of \Delta \rho: complete correction O(alpha alpha_s) included (gluino contribution added.) Files that changed: FeynHiggs.f, delrhosub.f, Introduction.txt, makefile . New files: delrhoGluino[code,sum,var].f

Bug in def2.f fixed (mt = 175 GeV had been forced there, only relevant if stop masses had been used as input parameters)

Introduction improved, definition of mu clarified

FeynHiggs is available

-> corresponds to the published version hep-ph/9812320.

Bug fixes and other improvements after

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