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SPheno
This is the development page for the SPheno project.
The current version
is 4.0.5 (7 Oct. 2021) (Download); older version (before version 3.1.4) can be obtained from the
author.
If you are looking for a SPheno version for an extended SUSY model, you can create this using
the SARAH package developed by Florian Staub.
If you use SPheno to write a paper,
please cite
W. Porod, Comput. Phys. Commun. 153 (2003)
275 [arXiv:hep-ph/0301101] and
W. Porod and F. Staub, Comput. Phys. Commun. 183 (2012) 2458
[arXiv:1104.1573] , which are
the SPheno manuals. The version on the
electronic hep-ph archive will be updated regularly with more recent versions.
SPheno stands for S(upersymmetric) Pheno(menology).
The code calculates
the SUSY spectrum using low energy data and a user supplied high scale
model as input. The spectrum is used to calculate two- and three body
decay modes of supersymmetric particle as well as of Higgs bosons.
In addition the production cross sections for supersymmetric particle and
Higgs bosons in e^+ e^- annihilation is calculated. Moreover,
the branching of the decay $b \to s \gamma$, the SUSY contribution to
anomalous magnetic moment of the muon as well as the SUSY
contributions to the rho parameter due to sfermions are calculated.
The code is written in F90 with an emphasis on easy generalisability.
The structure is set such that complex phases as well as the extension
to include the flavour structure can be done in a straight forward way.
The 2-loop renormalization group equations as well as the one-loop
finite corrections a la Bagger, Matchev, Pierce and Zhang are included.
In addition the two-loop corrections to the neutral Higgs boson masses
(a la Brignole, Degrassi, Slavich and Zwirner) and to the mu-parameter
(a la Dedes and Slavich) are included. Starting with version 2.2.2 the
SUSY Les Houches
Accord is supported as well as the
SPA conventions (for details see
hep-ph/0511344).
Starting with version 4.0. the internal structure has been changed such, that the SM-RGEs are
run at 3-loop to the scale Q corresponding to the square root of the stop masses. At this scale
the matching between the SM and the MSSM occurs. Details can be found in
arXiv:1703.03267 [hep-ph].
Starting with version 3.0. the complete flavour and CP structure of the
MSSM as well
as bilinear R-parity violation has been implemented. The input and output is
done via he
SUSY Les Houches
Accord 2 . Moreover, starting with version 3.1.10 also parts of
the proposal to include seesaw models has been implemented, see the corresponding
chapter of the
Les Houches Proceedings 2011
and with starting with version 3.1.10 also parts of the
Flavour Les Houches Accord
have been implemented.
Detailed comparisons between SPheno and other public codes have been performed
in:
To install SPheno, you will need a F95 (F90) compiler. No additional library
is necessary. The code has been successfully compiled using
NAG F95, Lahey/Fujitsu lf95, gfortran, g95,
and Intel ifort (version 11.1) on linux PC system [from this list, the
g95 and
gfortran are completely free].
In case of the gfortran compiler depending on the compiler version and platform
deviations from the results of the other compilers, which agree among themselves
perfectly, have been found up to a few per-cent. However, starting with
version 4.4 the results agree with the other compilers.
The code is supposed to be standard ANSI compatible F95.
The present release contains the main program SPheno.f90 and the
Code for the SPheno library (libSPheno.a, link with -lSPheno).
A Makefile is also included: the default compiler is ifort, but the options
are now also included for other compilers.
In linux, just unpack the files with
> gunzip SPheno-4.0.4.tar.gz
> tar -xvf SPheno-4.0.4.tar
then type (if necessary change the definitions for the f90 compiler)
> cd SPheno-4.0.4
> make (or gmake)
The program is then run by
> bin/SPheno
The output file SPheno.spc
should be identical
(except for small numerical
deviations depending on the compiler) to
SPheno.spc (SLHA format).
The compilation of the RGEs for the seesaw tpye II and type III models
is rather time consuming and can take up to one hour in the optimized mode.
For this reason they are not included in the compilation using the
default options. If you want to include, include the option -DSEESAWIII
in the Makefile that is located in the src directory. In this way
both set of RGEs are included.
- 1) running from the Z-mass scale to the scale Q (square root of the stop masses)
using 3-loop SM RGEs, matching the SM and the MSSM at this scale. The old
procedure used in versions 3.3.8. and before can be obtained by setting the flag
49 of the block SPhenoInput to 1. Some features are not yet enabled in the new version,
see section Known problems below.
- 2) implementing new high scale model: general mirage mediation
- 3) in case that a decay of a SUSY particle into at least one light
quark is possible, it is now required to have at least sufficient
phase space to create a pion
- 4) adding the MSOFT block as input possiblity within the SLHA format
- 1) additional flavour observables: epsilon_K, BR(K-> pi nu nu);
BR(B_q -> e+ e-), tau+ tau- (q=d,s).
This required a change in the ordering of the block SPhenoLowEnergy
compared to previous versions.
- 2) using now the FLHA blocks FMASS, FCONST and FLIFE to change masses,
decay constants and life times of mesons
- 3) Changed implementation of resummation of chirally enhanced terms based
on arXiv:1103.4272. This improves in particular the numerical stability in
case of very large trilinear couplings.
- 4) Gravitino mass can be given as input in a general MSSM model using the non-standard
entry 1000039 (PDG code for gravitino) in block EXTPAR
- 5) Update of SM default input to PDG 2013 values
- 6) Starting with version 3.3.3 Q_EWSB is calculated using the tree-level stop
masses instead of the loop corrected values. For high scale models the changes
are rather small whereas for input at the electroweak scale the numerical
stability is enhanced.
- 7) adding decay chargino -> gravitino + W
- 8) extended checks for NaN, in particular before the diagonalisation of matrices
- 9) adding decay gluino -> gravitino + gluon
- 10) improved search for consistent bilinear parameters such that neutrino data can be
explained via bilinear R-parity violation
- 1) Calculation of 3-body decays of sleptons and sneutrinos (thanks to Lukas Mitzka)
- 2) New flag 13 for the block SPhenoInput: the branching ratios for h-> V V* can
either be given as two-body decays in the output or folded with the branching
ratios of the vector boson as three body decay
- 3) Calculation of chargino_1 -> pi+ neutralino_1 and neutralino_2 -> pi0 neutralino_1
in case of small differences
- 4) Improving the numerical stability of 3- and 4-point one-loop functions in case
zero outer momenta
- 5) Improving the numerical stability in case of flavour violation and CP phases in the
soft-sUSY-breaking sector
- 1) Implementation of Seesaw type I, II and III models. In case you want to
use type II and/or type III you have to change the compiler options
in the Makefile of the src directory
- 2) Implementation of rare lepton decays and additional B-physics observables
- 3) Enhanced speed in case of difficult scenarios
- 4) New blocks in the output which serve as input for the program
HiggsBounds
- 5) Taking into account all Yukawas in for the running of tan(beta)
- 6) Improving the routine which determines the R-parity violating parameters when
fitting the neutrino data
- 7) In case of SPA conventions one has to use entry 25 of EXTPAR to
specify tan(beta) at m_Z and not as up to now entry 3 of MINPAR
where tan(beta) is given at m_Z
- 8) Three body decays of sleptons via virtual neutralinos have been added
- 9) Including the possibility to give within mSUGRA scenarios
m_A and mu at the electroweak scale. An example for a
corresponding input file can be found in the directory
input and is called LesHouches.in.mNUHM
file is called. An example where the Higgs mass parameters
are non-universal is given in LesHouches.in.mSUGRA_NUHM
- 10) Implementing the SLHA proposal for seesaw scenarios as given
in arXiv:1203.1488 (Les Houches 2011 proceedings)
- 11) Improving speeds of the RGE calculation in case of complex parameters,
this is in
particular relevant for the seesaw models.
- 12) improved calculation of BR(h0 -> gamma gamma) and BR(H0 -> g g)
- In the new approach starting version 4.0.2 the case of flavor mixing
shows instabilities and should not be used for the moment being. In
case that someone is interrested in flavor mixing, the flag 49 of
the block SPhenoInput should be set to 1 so that the old approach is used.
- The mixed input where some of the soft SUSY parameters are specified at
the low scale and the rest at the GUT scale is disabled n 4.0.x for the moment being
in the new scheme. This will be enabled again in one of the coming versions.
For the moment you have to use the old approach by setting flag 49 to 1.
- In the calculation of the loop-corrected masses the iteration over
the external momenta in the loop functions has been switched of, as this
implies an uncontrolled mixing of parts of higher order corrections.
This had let to problems in cases where small mass difference became important. For the loop corrections to the tree-level masses, now in loop functions the external momentum is set to the value of the corresponding tree level mass.
- The problem of the -U option for the linker has been solved, thanks to Wojciech Kotlarski for the corresponding suggestion.
- in the calculation of the W-boson mass the on-shell top mass is used now; the previously
used running mass was inconsistent with the formula for the 2-loop contribution.
- the branching ratios of a chargino/neutralino into a pion and another chargino/neutralino
was too large by a factor g^2.
- in the case that a chargino or a neutralino_2 had decays into final into the two
final states gravitino + V (V=W,Z) and
neutralino_1 pion, the sum of the branching ratios was not normalized to one.
- correcting a bug in the couplings of higgsinos to gravitinos
- correcting a bug in the output for 3-body decays of sneutrinos: the charge assignements have
been partially wrong in case of slepton lepton nu final states. This was only an output problem.
- in mSUGRA scenarios, where flavour violation was switched on, the Yukawa couplings
were not recalculated.
- in models where the input was at low energy scales and where the Higgs sector was
specified in terms of mu and m_A (mass of pseudoscalar Higgs boson) it could happen
under certain circumstances that the value of tan(beta) at m_Z got replaced by the
one from tan(beta) at Q_EWSB
- in the calculation of the Yukawas a factor of 1/sqrt(2) was missed when translating
the formulas of arXiv:1103.4272 to the conventions used in SPheno; this affects
mainly the bottom and tau Yukawa couplings for large tan(beta)
- in case of input at the soft mass parameters at the electroweak scale, the trilinear
parameters from the SUSY scale had been used instead of the ones at m_Z resulting in
a shift of the top-Yukawa coupling by about one percent. The main effect was a shift in
the Higgs mass calculation; all other masses were hardly affected.
- correcting a typo in the recently introduced special cases (2nd mass-entry is zero) in the routine
GLoop which is used for the calculation of 1-loop corrections to scalar mass-matrices
- bug in the calcultion of the gravitino couplings corrected for the case
that the gravitino mass is read in via EXTPAR
- correcting a bug in gluino contribution to C_8 and C_8'; the numerical
effect is however small
- correcting a bug in B_q -> l+ l- decays in case of complex input
- the decays of a neutralino into a gravitino had a bug in the kinematical function
- RGE running of tan(beta) is gauge dependent, setting R_xi=1 (previously 0)
- for low energy input, the calculation of the Higgs mass contained a bug which
can lead to sizable changes in case of large A_top and/or large mu tan(beta).
- fixing a bug in the output for flavour violating scenarios for both, slepton
and squark mass parameters.
- fixing a problem if EXTPAR input is given at the electroweak scale in high scale models
as in some case the GUT scale got set to the electroweak scale
- adding top-charged Higgs and top-W loops to the 1-loop effective d_i-d_j-H/A couplings,
leads to small numerical effects for BR(Bs-> mu+ mu-) and Delta(M_B_s) which are at
most one per-cent, usually below the per-mille level
- adding a check in the 3-body decays of sneutrinos and sleptons if a vector boson is on-shell
- in case of R-parity violation: the coupling of a neutral
scalar to two W-bosons had been set to zero in the decay routines; is now calculated properly
- general MSSM: calculate sign (phase) of mu if not given in block MINPAR
- the value of m^2_Hu had been set incorrectly in NUHM scenarios
- fixing a problem in the calculation of Delta(M_Bs), B_s -> mu+ mu- and Bu -> tau nu:
the Wilson coefficients are now calculated Q=160 GeV instead Q=m_Z
- correcting bug in the calculation of BR(Z -> l_i l_j),
BR(l_i -> 3 l_j) and BR(b -> s mu+ mu-). In the examples, the
numerical effects are small.
- Correcting input for low energy parameters in case of bilinear
R-parity violation.
- Correcting a bug in case of Z decays into two charged leptons with different
flavour.
- Correcting a bug in case of the Higgs-mass calculation
related to the use of the loop-corrected mu-parameter. This can lead to shifts of
up to several GeV for m_h in case of large A_t (at the electroweak scale).
The heavier Higgs bosons are hardly affected. The standard examples are hardly
affected.
- Correcting a bug in case of neutrino mass calculation for bilinear R-parity
violation: in some cases the seesaw formula had been implemented incorrectly
taking only the real part of the inverses neutralino mass matrix.
- In case of complex phases there has been a missing relative
complex conjugation between the A-parameter and the mu-parameter
in the LR-sector in case of generation mixing. This affects mainly
the EDM calculation but leaves the spectrum essentially unchanged.
- Correcting a bug in case of input parameters are the
electroweak scale and where on-shell mass for the
pseudoscalar Higgs boson is used as input.
- 1) the values of EXTPAR are also given in SPheno.spc
- 2) the leptonic EDMs had been too small by a factor 100 due to a typo
in an overall factor. Moreover, there has been a convention problem
in the sfermion mass problems which mainly affects the electron EDM
and only slightly the other EDMs and at most at the per-mille the
Delta(M_Bd) and Delta(M_Bs).
- 1) input for left slepton mass squared parameters fixed
- 2) fixing numerical problem in expansion for loop function DB_0
- 1) a problem related to the input of slepton mass parameters in the
super-PMNS basis at the electroweak scalae has been fixed.
- 2) a bug in the charged Higgs boson contribution to the fermion
self-energies has been fixed, little impact on the numerical results
- 3) the coefficient of the U(1) coupling in the running of the dim-5
neutrino mass operator has been corrected, small numerical impact
- 1) wrong value for mu in the output
- 2) in case of seesaw I models the manual contained the
wrong ordering of the indices of the Yukawa couplings
- 3) correcting an error in the routine for calculating the non-universal contributions to
the gauge couplings and m_W at m_Z in case of generation mixing and phases in the
lepton/slepton sector; can lead to numerical differences which are significant
- 4) in case of flavour violating 3-body decays of charginos a bug
has been fixed for the final states t q neutralino_j, where
q=d,s
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