ZFITTER news page at DESY, Zeuthen
Wo ZFITTER drin ist, soll auch ZFITTER draufstehen
The legal status of ZFITTER is under investigation since March 2011.
Because it is not predictable when the case will be finished, and what will be the result, it might not be appropriate to distribute ZFITTER software in the meantime using this platform at DESY.
All the corresponding links have been deactivated.
In case of interest, please contact the program repository of "Computer Physics Communications".
[2011-05-27]
2011-03-25 - 2011-05-27, Tord Riemann
On 2011-03-03/07, we decided to perform few preliminary measures concerning the presentation of the status of the ZFITTER project.
Since May 18, 2005, ZFITTER is supported by the 'ZFITTER support group'.
With an explicit agreement of the ZFITTER
authors [D. Bardin (spokesperson until 2005), P. Christova, L. Kalinovskaya, S. Riemann, T. Riemann et al.], we decided to
organize the support of the ZFITTER code starting with
v.6.42 in
such a way that the original author staff remains
untouched, but that also the supporting collegues get
the credit for their dedication.
The composition of the ZFITTER support group may change.
ZFITTER support group [2011]:
Arif Akhundov,
Andrej Arbuzov,
Michal Czakon,
Ayres Freitas,
Martin Grünewald,
Sabine Riemann,
Tord Riemann (spokesperson)
We just add here the explicit links to the two journal articles to be quoted when using ZFITTER. These journal articles are, of course, more relevant sources of information on legal status than this webpage or a preprint:
Program descriptions:
- D.Yu. Bardin, P. Christova, M. Jack, L. Kalinovskaya, A. Olchevski, S. Riemann, T. Riemann, "ZFITTER v.6.21: A Semianalytical program for fermion pair production in e+ e- annihilation"
9908433,
published in
Comp. Phys. Commun. 133 (2001) 229-395
-
A.B. Arbuzov, M. Awramik, M. Czakon, A. Freitas, M.W. Grunewald, S. Riemann, T. Riemann,
"ZFITTER: a semi-analytical program for fermion pair production in e+ e- annihilation, from version 6.21 to version 6.42"
0507146,
published in
Comput. Phys. Commun. 174 (2006) 728-758.
A correct citation of the ZFITTER package will include both references.
The Program Summary URLs are made evident in the articles:
ADMJ.
Some licences are easily found there, but please have in mind that licences are not the full copyright story.
The conditions of use of ZFITTER are those as usually with [licenced] opensource software.
To say it in rough words, you may assume that the common practice of the last 20 years was fully ok for the ZFITTER authors:
Take a copy of your choice, use it for your project; this often includes also some necessary changes in the original code; if you find improvements of general interest, do so as all the others before: plug the improvements into the official last version together with the authors of ZFITTER [or with the ZFITTER support group], get your credit for that; normally, you will make just very minor changes and write your personal interface for using ZFITTER.
The year-long practice of the LEPEWWG is a 'good practice example'.
Do never forget that the successful use of ZFITTER would have been impossible without the generous help of the community and the long-term co-operation with G. Passarino and the
TOPAZ0 team (G.P. and G. Montagna, O. Nicrosini, F. Piccinini, R. Pittau), because the complexity of the standard model's fortranization deserves more than one independent implementation.
For those who want to know more about the complexity of the theoretical framework, we recommend the book
"The Standard Model in the Making: Precision Study of the Electroweak Interactions",
Oxford University Press, USA (December 9, 1999) by D. Bardin and G. Passarino.
Other helpful documents are e.g.
"Electroweak Working Group Report",
a part of: D. Bardin, W. Hollik, G. Passarino (eds.), "Reports of the working group on precision calculations for the Z resonance", CERN 95-03 (31 March 1995),
and
"Precision Calculation Project Report" by D. Bardin, M. Grunewald, G. Passarino.
Finally, make the proper quotations, including referencing the 2 CPC articles and, if appropriate, reference other theoretical papers of relevance to your project.
It is, in the opinion of Tord Riemann, DESY, and others, no good practice to take an opensource code [with a licence], to make it proprietary and then to claim it is much better than the original and use it freely without mentioning that the original has been used.
We finish with some informations for the innocent:
- The webmaster of this webpage is, as may be seen e.g. from the return button at the bottom: Tord Riemann, DESY.
- From the location of the webpage, at /www-zeuthen.desy.de/theory/research/zfitter/, this may be concluded either.
Since 2009 we are [not yet really] migrating to http://zfitter.desy.de.
- There is, of course, a spokesperson of the ZFITTER support group, it is Tord Riemann, DESY.
He was submitting the two descriptions to hep-ph and to CPC, see submission histories
9908433 and
0507146.
Also from the webpage one may guess this, but one is allowed to ask for this information any of the members of the ZFITTER support group.
- Needless to say: It is allowed to ask any author of ZFITTER or any member of the ZFITTER support group any question related to ZFITTER and its status.
Some interesting additional informations for the innocent may be found at our webpage on
Urheberrecht/copyright law.
During the coffee discussions on that topic - Urheberrecht, or, in English terms, copyright law - during the
CAPP 2011 School
the quest was raised to collect some introductory information. At the webpage we do so.
The content below the horizontal double line is unchanged [with the exceptions mentioned] compared to the last update, Fr 24. Jul 15:26:51 CEST 2009, and documented in the IT group at DESY.
- The ZFITTER version 6.43 (17 June 2008) may be obtained by everybody on request from tord.riemann@desy.de or from sabine.riemann@desy.de - link has been deactivated
- The ZFITTER version 6.42 (18 May 2005) may be obtained by everybody on request from tord.riemann@desy.de or from sabine.riemann@desy.de - link has been deactivated
ZFITTER is a Fortran package for the evaluation of radiative corrections (quantum corrections), as predicted in the Standard Model of elementary particles, to a variety of observable quantities, notably those related to the Z-boson resonance peak studied at LEP, CERN.
These predictions depend on the masses of the particles in the Standard Model and on a coupling constant.
So there was the possibility to predict, assuming the validity of the Standard Model, the masses of the top quark and of the Higgs boson from quantum corrections, prior to their discoveries by a direct production.
The top quark has been discovered at the Tevatron, Fermilab, while we are searching yet for the Higgs boson at Fermilab and at LHC, CERN.
ZFITTER has been used for many experimental and phenomenological studies.
The perhaps most important applications for the elementary particle physics community may be found at the webpage of the LEP electroweak working group
LEPEWWG.
The prediction of the Higgs mass, assuming the Standard Model being valid, derived from radiative corrections to precision observables measured at LEP and other facilities, is visualized in the popular Blue Band Plot.
s08_blueband.eps -
s08_blueband.pdf
The plot is made with the ZFITTER package, in its lates version of 2008 with ZFITTER v. 6.43.
-
Since May 18, 2005, ZFITTER is supported by the 'ZFITTER support group'.
With an explicit agreement of the ZFITTER authors, we decided to
organize the support of the ZFITTER code starting with
v.6.42 in
such a way that the original author staff remains
untouched, but that also the supporting collegues get
the credit for their dedication.
The composition of the ZFITTER support group may change.
ZFITTER support group (June 2008): 
Andrej Arbuzov,
Michal Czakon,
Ayres Freitas,
Martin Grünewald,
Klaus Mönig,
Sabine Riemann,
Tord Riemann
-
ZFITTER Authors (1999 - today):
Dima Bardin, Penka Christova, Mark Jack, Lida Kalinovskaya,
Sacha Olshevski, Sabine Riemann, Tord Riemann
For the complete list of recent authors: click
here
- Fortran code:

ZFITTER version 6.43 (17 June 2008): click
here .
The only changes compared to ZFITTER version 6.42 are in the files zfusr6_43.f and dizet6_43.f.
Thanks to Daisuke Nomura for indicating a bug in
dizet6_42.f.
Packeting Tord Riemann,
test running Martin Grünewald.
A quick fit shows a negligible effect of 0.9 MeV (!)
on the central MH value due to the correction.
ZFITTER version 6.42 (18 May 2005): click
here .
An information from Matthias Steinhauser (1 May 2006, private information),
concerning the 4-loop QCD singlet-contribution to the rho-parameter (which is not evaluated in ZFITTER):
the numerical effect on the W-mass and on the effective weak mixing angle is unexpectedly small. This points to a good convergence of the perturbative series. If the situation met at three loops repeats for 4 loops, then the non-singlet corrections should be much smaller.
Reference: Y. Schröder, M. Steinhauser:
"Four-Loop Singlet Contribution to the rho Parameter"
Phys.Lett. B622 (2005) 124-130, hep-ph/0504055,
An information from Hasko Stenzel (26 Feb 2007, private information):
There exists a 'private' version of the ZFITTER code, based on v.6.42,
with an implementation of the renormalization scale. A variation of
the mu-scale indicates a perturbative uncertainty of about 1 %
for hadronic observables at the Z pole.
Reference: H.Stenzel, " Theoretical uncertainties for measurements of
alpha_s from electroweak observables", JHEP 0507:0132,2005.
Further information: Hasko.Stenzel@cern.ch
-
Program description:
ZFITTER: a semi-analytical program for fermion pair production in e+ e- annihilation, from version 6.21 to version 6.42
[hep-ph/0507146]
Comput. Phys. Commun. 174 (2006) 728-758.
A correct citation of the ZFITTER package will include both this reference, but also
the description of ZFITTER v.6.21 (August 1999),
[hep-ph/9908433], published in Comp. Phys. Commun. 133 (2001) 229
Descriptions of older versions of ZFITTER
-
Program description update of ZFITTER v.6.30 (June 2000):
A short (but complete) description of the changes of ZFITTER
v.6.30 (June 2000) compared to the last described
version v.6.21 (August 1999) may be found in:
"Reports of the working groups on precision
calculations for LEP2 physics":
CERN-2000-09-D (July 2000) [hep-ph/0007180], click
here
When quoting this version, please refer to both the workshop write-up and the description of the program in Comput. Phys. Commun. 133 (2001) 229 [hep-ph/9908433]
-
Program description of ZFITTER v.6.21 (August 1999):
DESY 99-070 (1999) [hep-ph/9908433]: click
here
Published in Comp. Phys. Commun. 133 (2001) 229
-
Program description of version 4.5 (19 April 1992):
CERN-TH. 6443/92 (1992) [hep-ph/9412201]: click
here
This program description remained unpublished.
Older versions of the ZFITTER package
For changes of the program compared to foregoing versions see
beginning of files zfitr6_xy.f.
The programs are also available from:
/afs/cern.ch/user/b/bardindy/public/ZF6_xy/.
- version 6.42 (18 May 2005) click
here
- version 6.41 (15 October 2004) click
here
- version 6.40 (29 April 2004) click
here
- version 6.36 (21 June 2001) click
here
- version 6.35 (18 Februar 2001) click
here
- version 6.30.02 (26 June 2000) click
here.
This version was used for the numerical contributions to the
2f subgroup of the LEP 2 Monte Carlo Workshop (2000),
published as CERN Yellow Report CERN-2000-09-D (July 2000)
[hep-ph/0007180]
- version 6.30.01 (05 June 2000) click
here
- version 6.30 (25 April 2000) click
here
- version 6.23 (of 13 Dec 1999) click
here
- version 6.22 (of 15 Oct 1999) click
here.
- version 6.21 (of 26 July 1999) click
here.
- version 6.11 (of 23 June 1999) click
here.
- version 6.10 (of 27 May 1999) click
here.
Yet older versions:
- version 6.06 (of 13 May 1999) click
here
It is also available from: /afs/cern.ch/user/b/bardindy/public/ZF6_06/.
It replaces v.6.04 (of 21 April 1999)
For changes compared to v.6.04 see beginning of file
zfitr6_06.f. We only mention that package acol.f was
heavily improved, got much shorter and few bugs have been
removed. The corresponding numerics is practically unchanged.
- version 6.04 (of 21 April 1999) click
here
It is also available from: /afs/cern.ch/user/b/bardindy/public/ZF6_04/.
It replaces v.5.21 (of 09 March 1999)
Changes compared to v.5.21 include:
corrected treatment of acollinearity cut options; for details
see DESY 99-015 (hep-ph/9902408) to appear in Phys. Letters B,
DESY 99-037 (in preparation) and references therein
Versions of ZFITTER older than v.6
may be found here:
- version 5.21 (of 09 March 1999) click
here
It is also available from: /afs/cern.ch/user/b/bardindy/public/ZF5_21/.
It replaces v.5.20 (of 17 Feb 1999)
Changes compared to v.5.20 include:
New treatment of ZMIN cut
New flag FSRS is added (Final State Radiation Scale)
Subroutine ZUCUTS: argument list is modified
- version 5.20 (of 17 Feb 1999) click
here.
It is also available from: /afs/cern.ch/user/b/bardindy/public/ZF5_20/.
It replaces v.5.15 (of 02 Dec 1998)
Changes compared to v.5.15 are many.
This program version is used for the preparation of a
"Precision Calculation Project Report" written by
D. Bardin, M. Gruenewald and G. Passarino, hep-ph/9902452
- version 5.15 (of 02 Dec 1998) click
here
It is also available from: /afs/cern.ch/user/b/bardindy/public/ZF5_15/.
It replaces v.5.14 (of 27 Oct 1998)
Changes compared to v.5.14 include:
From 5.13 to 5.15 several bug fixes; for more details see begin of
file zfitr5_15.f
- version 5.14 (of 27 Oct 1998) click
here.
It is also available from CERN afs ~/bardindy/public/ZF5_14/.
It replaces v.5.13 (of 21 Oct 1998)
Changes compared to v.5.13 include:
1. flag IQCD=3: Kniehl's exact and CPU saving calculation of
O(alfa_em x alfa_s) corrections
2. many real numbers made explicitely double precise
3. funny bug for IGAMS=0 fixed
For a short presentation of developments which led to v.5.14:
click
here
- version 5.13 (of 21 Oct 1998) click
here
This replaces v.5.12 (of 16 June 1998)
Changes compared to v.5.12 are commented at top of
file zfitr5_13.f; they concern:
0. Lepton masses;
1. Running \alpha_{em} - \Delta\alpha^{(5)}_{had} is released
for fits instead of ALQED;
2. Fermi constant;
3. \rho_f.
- version 5.12 (of 16 June 1998) click
here
This replaces v.5.12 (of 15 June 1998) - a bug was found.
Changes compared to v.5.11 and v.5.10 are mentioned at top of
file zfitr5_12.f
- version 5.11 (of 08 June 1998): debugged
and replaced by v.5.12
-
version 5.10 (of 06 March 1998) click
here
Changes compared to v.5_beta are mentioned at top of file zfitr5_10.f
- version 5_beta (of 15 Juli 1997) click
here
- version 5_beta (of 05 Feb 1997) click
here
Versions of ZFITTER older than v.5
may be found here:
- ZFITTER v.4.9
(used for D. Bardin et al., Electroweak Working Group
Report, in "Reports of the working group on precision
calculations at the Z resonance", CERN 95-03 (March 1995),
hep-ph/9709229
and used for F. Boudjema et al., Standard Model Processes, in "Physics
at LEP2", CERN 96-01 (Feb 1996), hep-ph/9601224):
click
here
- ZFITTER v.4.8 click
here
- ZFITTER v.4.6 click
here
- ZFITTER v.4.5x click
here
- ZFITTER v.4.5 (19 April 1992) - described in
CERN-TH. 6443/92 (1992)
[hep-ph/9412201] click
here
- very ancient versions of ZFITTER click
here; version 4.00 is dated as of June 1991, older versions seem to be lost.
Auxiliary material
New programming for predictions with acollinearity cut (1999):
The changes are valid since versions 6.04 (April
1999), 6.06 (May 1999) and correspond to:
Phys. Lett. B456 (1999) 264 [hep-ph/9902408]: click
here
DESY 99-037 (1999) [hep-ph/9908289]: click
here
At LEP1 energies - for tables click
here (from talk at CERN LEP2 WS, March 1999).
At LEP2 energies - for figures click
here (from talks at CERN LEP2 WS, March 1999,
at Oxford LC WS, April, and at Sitges LC WS, May 1999).
Related programs:
- ZEFIT - a program hold by Sabine Riemann
for the study of extensions of the Standard
Model by additional Z' bosons or contact interactions:
click
here
- SMATASY - a program hold by Martin Gruenewald, Stefan Kirsch
and Tord Riemann
for the model-independent study of the Z
boson resonance: click
here or here
or
here
- GAPP - a program hold by Jens Erler and Paul Langacker
"... short for the Global Analysis of Particle Properties.
It is devoted to the calculation of
pseudo-observables, i.e. observables with experiment specific
corrections (such as initial state
radiation or detector specifics) removed. The
reduction of raw data to
pseudo-observables is
performed by the experimenters with available packages
(e.g. ZFITTER
for Z pole physics)."
click
here
back to: DESY, Zeuthen theory group
homepage
back to: Tord Riemann's
homepage
Tord Riemann
Last modified: Fr 24. Jul 15:26:51 CEST 2009