First of all, I want to apologize: this page is
not meant for general udience but only for internal review ...
A short introduction
27-6-74 Italian Diploma from the Physics Department of Torino University
with a thesis on Renormalization Group and Phase Transitions ,
1-11-74 to 24-12-81 Junior researcher ( Assegno di formazione scientifica e
didattica) at the Institute for Theoretical Physics, Torino.
University
1-1-76 to 31-10-77 on leave from Torino, researcher at the
Institute for Theoretical Physics, Utrecht University (NL).
24-12-81 Researcher ( ricercatore confermato) at the Institute for
Theoretical Physics, Torino.
1-10-82 to 31-9-83 INFN Fellow at SLAC (Stanford University).
1-3-84 to 31-6-84 Visiting Scientist at the Physics Departemnt, University
of Michigan.
1-3-86 to 31-9-86 Visiting Scientist at the Physics Department, University
of Michigan.
1-7-87 to 31-9-87 Visiting Scientist at the Physics Department, University
of Michigan.
1-8-88 to 31-9-88 Visiting Scientist at the Physics Department, University
of Michigan.
1-5-91 to 31-5-91 Visiting Scientist at the Physics Department, University
of Michigan.
1-10-96 Associate Professor, Department of Theoretical Physics, Torino
University.
28-12-99
Universita' degli Studi di ROMA "Tor Vergata"
Concorso ad un posto da Professore Ordinario presso la Facoltà di SCIENZE MATEMATICHE FISICHE e NATURALI , settore disciplinare B02A: FISICA TEORICA
n. domande candidati 28
Idonei: PASSARINO Gian Piero, SAGNOTTI Augusto, VULPIANI Angelo
1-11-00 Full Professor, Department of Theoretical Physics, Torino
University.
Oldies but Goldies:
Les Houches Summer School 75, Methods in Field Theory
Cargese Summer School 76, Recent Developments in Field Theory and
Statistical Mechanics .
Workshop on QED Structure Functions, Ann Arbor, Michigan,
May 22-25, 1989.
XXVIth Recontre de Moriond, Les Arcs, Savoie, March 11-17,1991.
Ringberg Workshop on High Precision vs. High Energy
in $e^+e^-$ Collisions, Ringberg, April 15-19, 1991.
Conference on Gauge Theories - Past and Future, Ann Arbor,
16-18 May, 1991.
91 Electroweak Interactions and Unified Theories, Les Arcs France March 11-17
1991.
Joint International Lepton-Photon Symposium
\& Europhysics Conference on High Energy Physics, Geneva,
Switzerland, 25 July - 1 August 1991.
SSC Physics Symposium, Wisconsin, Madison, April 13-15, 1992.
Workshop on Perspectives of the Electroweak Interaction in
$e^+e^-$ Collisions, Ringberg 4-8 April,1993.
Elementary Particles, Quantum Fields and Statistical Mechanics,
Lectures given at the Summer School in Theoretical Physics, Parma
1991-1993.
1994 Zeuthen Workshop on Elementary Particle Theory, Teupitz Germany 10-15
April 1994.
27th International Conference on High Energy Physics, Glasgow, 20-27th
July 1994.
Working Group on Precision Calculations for the
$Z$-resonance, CERN 1995.
Ringberg Workshop on "Perspectives for
Electroweak Interactions in $e^+e^-$ Collisions", Ringberg Castle Germany 5-8
February 1995.
XIXth International Conference on Theoretical
Physics, Szczyrk 19-26 September 1995.
XV Workshop on Weak Interactions and Neutrinos, Talloires France 4-8 September
1995.
International Europhysics Conference on High Energy Physics, Brussels
Belgium 27 July - 2 August 1995.
Workshop in Physics at LEP2, CERN 96.
28th International Conference on High Energy physics, Warsaw Poland 25-31
July 1996.
3rd International Symposium on Radiative
Corrections, Cracow, Poland, August 1-5, 1996.
Cracow Epiphany Conference on W Boson,
Krakow, Poland, January 4-6, 1997
XVI Workshop on Weak Interactions and Neutrinos, Capri Italy 22-28 June 1997.
IV International Symposium on Radiative Corrections, Barcelona Spain
8-12 September 1998.
Convener of:
XV Workshop on Weak Iteractions and Neutrinos, Talloires France 4-8 September
1995: Convener of Working Group WG1 (with A.Blondel).
28th International Conference on High Energy Physics, Warsaw Poland
25-31 July 1996: Convener of Parallel Session Pa-07 (with J. Urheim).
International Europhysics Conference on High Energy Physics, Brussels
Belgium 27 July - 2 August 1995: Convener of Parallel Session PA-1
(with H.Videau)
Relevant CERN LEP
Yellow Reports
The Workshop on Precision calculations for the Z resonance
G.Passarino and M.Veltman, Nucl. Phys. B160(1979)151.
G.Passarino, Nucl. Phys. B204(1982)237.
M.Consoli and G.Passarino,
Phys. Lett. B117(1982)257.
G.Passarino,
Nucl. Phys. B224(1983)265.
G.Passarino,
Phys. Rev. D28(1983)2867.
G.Passarino,
Phys. Lett. B130(1983)115.
G.Passarino,
Nucl. Phys. B237(1984)249.
G.Passarino,
Nucl. Phys. B241(1984)48.
G.Passarino,
University of Michigan preprint UM TH 84-8.
A.Ballestrero and G.Passarino,
Phys. Lett. 148B(1984)373.
A.Ballestrero and G.Passarino,
Phys. Lett. 148B(1984)378.
G.Passarino,
Phys. Lett. 152B(1985)271.
G.Passarino,
Phys. Lett. 156B(1985)231.
G.Passarino,
Phys. Lett. 161B(1985)341.
M.Consoli and G.Passarino,
Phys. Lett 165B(1985)113.
G.Passarino,
Talk given at the Torino Meeting on Superunification and
Extra Dimensions.
G.Passarino,
Phys. Lett. 176B(1986)135.
G.Passarino,
Phys. Lett. 183B(1987)375.
G.Passarino,
Nucl. Phys. B284(1987)473.
G.Passarino,
Phys. Lett. 195B(1987)191.
G.Passarino,
Phys. Lett. 197B(1987)409.
G.Passarino,
Nucl. Phys. B304(1988)557.
G.Passarino,
Torino preprint DFTT/G-88-1.
G.Passarino and R.Pittau,
Phys. Lett. 215B(1988)154.
G.Passarino,
Talk given at the LEP-Parma Meeting, 13-14 October 1988.
G.Passarino,
Radiative Corrections for $e^+e^-$ Collisions, ed. J.H. K\"uhn,
Springer-Verlag 1989, p. 179.
G.Passarino and R.Pittau,
Phys. Lett. 228B(1989)89.
G. Passarino,
Phys. Lett. 231B(1989)458.
G. Passarino,
QED Structure Functions, ed. G.Bonvicini, AIP Conference Proceedings no.201
1990, p. 132.
G. Passarino,
Contributed paper to the International Europhysics
Conference on High Energy Physics, Madrid, September 6-13, 1989.
G. Passarino and M. Veltman,
Phys. Lett. 237B(1990)537.
G. Passarino,
Nucl. Phys. B343(1990)31.
G. Passarino,
Phys. Lett. B247(1990)587.
G. Passarino,
Phys. Lett. B255(1991)127.
G. Passarino,
Nucl Phys. B361(1991)351.
G. Passarino,
In '91 Electroweak Interactions and Unified Theories, J.Tran Thanh Van ed.,
p. 119 (Edition Frontieres).
G. Passarino,
Talk given at the Ringberg Workshop on High Precision vs. High Energy
in $e^+e^-$ Collisions, Ringberg, April 15-19, 1991.
Torino preprint DFTT/G-91-2.
G. Passarino,
In Gauge Theories - Past and Future, R. Akhoury et al. eds., p. 171 (World
Scientific 1992).
G. Passarino,
Proceedings of the Joint International Lepton-Photon Symposium
\& Europhysics Conference on High Energy Physics, Geneva, Switzerland,
25 July - 1 August 1991, vol. 1 p. 56 (World Scientific)
M. Cacciari, G. Montagna, O. Nicrosini and G. Passarino,
Phys. Lett. B279(1992)384.
M. Cacciari, G. Montagna, O. Nicrosini, G. Passarino and R. Pittau,
Phys. Lett. B286(1992)387.
G. Montagna, O. Nicrosini and G. Passarino,
Phys. Lett. B309(1993)436.
G. Montagna, O. Nicrosini and G. Passarino,
Phys. Lett. B303(1993)170.
G. Passarino,
Z. Phys. C26(1994)229.
G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini and R. Pittau,
Nucl. Phys. B401(1993)3.
G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini and R. Pittau,
Comput. Phys. Commun. 76(1993)328.
G. Passarino, talk given at the
Workshop on Perspectives of the Electroweak Interaction in $e^+e^-$
Collisions, Ringberg 4-8 April,1993.
Torino preprint, DFTT/G-93-4.
G. Passarino,
Phys. Lett. B313(1993)213.
O. Nicrosini, G. Passarino and F. Piccinini,
Torino preprint, DFTT/G-93-6.
G. Passarino,
in Elementary Particles, Quantum Fields and Statistical Mechanics,
Lectures given at the Summary School in Theoretical Physiscs, Parma
1991-1993, M. Bonini et al. eds., p. 203.
T. Hebbeker, M. Martinez, G. Passarino and G. Quast,
Phys. Lett. B331(1994)165.
G. Passarino,
Nucl. Phys. B(Proc. Suppl.) 37B(1994)32.
G. Montagna, O. Nicrosini, G. Passarino and F. Piccinini,
Phys. Lett. B355(1994)484.
G. Passarino,
Proceedings of the 27th International Conference on High Energy Physics,
Glasgow, 20-27th
July 1994, P.J. Bussey and I.G. Knowles eds., Institute of Physics
Publishing, p. 411.
G. Montagna, O. Nicrosini, G. Passarino and F. Piccinini,
Phys. Lett. B348(1995)178.
Reports of the Working Group on Precision Calculations for the
$Z$-resonance, D. Bardin, W. Hollik and G. Passarino eds., CERN preprint
95-03, March 1995.
D. Bardin and G. Passarino,
Proceedings of the Ringberg Workshop on "Perspectives for
Electroweak Interactions in $e^+e^-$ Collisions", B. A. Kniehl ed., World
Scientific, p. 17.
G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini,
Comput. Phys. Commun. 93(1996)120.
E. Argires et al.,
Phys. Lett. B358(1995)339.
G. Passarino,
talk given at the XIXth International Conference on Theoretical
Physics, Szczyrk 19-26 September 1995, Acta Phys. Pol. B27(1996)1605.
Report on Event Generators for WW Physics
in Vol.1, Report of the Workshop in Physics at
LEP2 G. Altarelli et. al., CERN-96-01.
Standard Model Processes, F. Boudjema et al.,
in Vol.1, Report of the Workshop in Physics at
LEP2 G. Altarelli et. al., CERN-96-01.
Event Generators for Discovery Physics, M. L. Mangano et al.,
in Vol.1, Report of the Workshop in Physics at
LEP2 G. Altarelli et. al., CERN-96-01.
Report on WW Cross-Sections and Distributions, W. Beenakker
et al., in Vol.1, Report of the Workshop in Physics at
LEP2 G. Altarelli et. al., CERN-96-01.
Higgs Physics at LEP2, M. Carena et al.,
in Vol.1, Report of the Workshop in Physics at
LEP2 G. Altarelli et. al., CERN-96-01.
G. Passarino,
Physics, Comp. Phys. Comm. 97(1996)261.
E. Accomando, A. Ballestrero and G. Passarino,
Nucl. Phys. B476(1996)3.
G. Passarino,
hep-ph/9604344.
G. Passarino,
Phenomenology, Talk given at the 3rd International Symposium on Radiative
Corrections, Cracow, Poland, August 1-5, 1996,
hep-ph/9611448. Acta Phys. Pol. B 28(1997)3-4.
G. Passarino,
hep-ph/9611248, Nucl. Phys. B488(1997)3.
W. Beenakker, G. J. van Oldenborgh, A. Denner, S. Dittmaier,
J. Hoogland, R. Kleiss, C. G. Papadopoulos and G. Passarino,
hep-ph/9612260, Nucl. Phys. B500(1997)255.
W. Beenakker and G. Passarino,
Phys. Lett. B425(1998)199.
G. Passarino,
Talk given at the Cracow Epiphany Conference on W Boson,
Krakow, Poland, January 4-6, 1997. Acta Phys. Pol. B 28(1997)6.
D. Bardin and G. Passarino,
hep-ph/9803425.
G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini,
hep-ph/9804211.
G. Passarino,
Nucl. Phys. B(Proc. Suppl.) 66(1998)87.
G. Passarino, hep-ph/9810416.
D. Bardin, M. Gruenewald and G. Passarino, hep-ph/9902452.
G. Passarino, The Hadronic Cross-Section at LEP~2 Energies
and Beyond, Radcor 98: Application of Quantum Field Theory to Phenomenology,
J. Sola` ed., World Scientific, p. 401.
G. Passarino, The Twofold Way, a Short Disquisition of LEP Physics
hep/ph-9911310.
G. Passarino, Unstable Particles and Non-Conserved Currents: A
Generalization of the Fermion-Loop Scheme, hep-ph9911482.
TOPAZ0 4.0 - A new version of a computer program for evaluation
of de-convoluted and realistic observables at LEP 1 and LEP 2
Author: G. Montagna, O. Nicrosini, F. Piccinini and G. Passarino
hep-ph/9804211: Click here
The program TOPAZ0 was developed for computing a variety of
physical observables which are related to the $e^+e^-$ annihilation
into fermion pairs and to the large angle Bhabha scattering around the Z
resonance. Among them, the Z parameters or pseudo-observables, the
de-convoluted cross sections and those dressed with QED radiation, and
finally the forward-backward asymmetries.
The calculations are performed both for a completely inclusive experimental
set-up and for a realistic one, i.e. a set-up with cuts on the acollinearity
angle, on the energy of the outgoing fermions or on their invariant
mass and angular acceptance. The new version, 4.0, includes several
innovative features.
First of all, the most important new capabilities since previous versions are
electroweak, QCD and QED correction factors that are relevant at
the Z resonance in the light of the present experimental accuracy.
Among them, the effect of the next-to-leading $\ord{\alpha^2\mts}$
corrections, the radiative corrections to the
hadronic decay of the Z, providing complete corrections of
$\ord{\alpha\alpha_s}$ to $\Gamma(\zb \to q\bar{q})$ with $q=u,d,s,c$ and $b$,
and leading $\ord{\alpha^3}$ QED corrections.
Secondly, the program has been upgraded to cover two-fermion final states at
LEP~2 energies, where some of the assumptions made for earlier versions are
no longer valid.
In particular, to this aim all the electroweak radiative corrections
relevant far from the Z peak have been added for
$s$-channel processes,
e.g. purely weak boxes, next-to-leading $\ord{\alpha^2}$
and leading $\ord{\alpha^3}$ QED corrections.}
WTO - A deterministic approach for four-fermion physics
Author: G. Passarino
Click here
The program WTO, which is designed for computing cross sections and other
relevant observables in the $e^+e^-$ annihilation into four fermions, is
described. The various quantities are computed over both a completely
inclusive experimental set-up and a realistic one, i.e. with cuts on the final
state energies, final state angles, scattering angles and final state
invariant masses. Initial state QED corrections are included by means of the
structure function approach while final state QCD corrections are applicable
in their aive formulation. A gauge restoring mechanism is included
according to the Fermion-Loop scheme. The program structure is highly modular
and particular care has been devoted to computing efficiency and speed.
This is the preface of the Workshop on Precision calculations for the Z
resonance
After five years of $e^+e^-$ collisions around the Z resonance
an impressive accuracy in data on Z observables has been
obtained. The sensitivity with respect to the radiative corrections
for electroweak observables, allowing precision tests of the
Standard Model at the level of its quantum structure, requires
the highest standards also on the theoretical side.
In 1989 the CERN Report `Z Physics at LEP 1' as a central documentation
has provided the theoretical basis for the physics analysis of the LEP
results. Although still being quite comprehensive, an update of the discussion
of radiative corrections has become necessary for at least two reasons:
the experimental accuracy has reached a level much higher than it was
originally expected
a sizeable amount of theoretical work contributing to a steady
improvement of the Standard Model predictions has appeared after the Yellow
Report of 1989.
The idea of presenting an update in the calculation of the
Z resonance observables was triggered by experimentalists
and has become substantiated as far as possible in the present
report. New theoretical input which has appeared after
1989 is included, both for the purely electroweak sector as well as
for hadronic final states involving QCD corrections. In particular
a crucial amount of work has been performed in providing higher
order QCD corrections to the partial and total Z widths and pinning down the
theoretical uncertainty of the Standard Model predictions:
the $\alpha_s^3$ final state corrections in the massless limit,
and for the massive quark case the $\alpha_s^3$ contributions to
the vector and $\alpha_s^2$ contributions to the axial-vector
parts of the $Z \rightarrow q \bar{q}$ decay width.
New in the electroweak sector are:
the complete two-loop ${\cal O}(\alpha\alpha_s)$ contributions
to the vector boson self-energies, the two-loop electroweak leading
contributions to the $\rho$-parameter and the $Zbb$ vertex,
the ${\cal O}(\alpha_s G_{\mu} m_t^2)$ term in the $Zbb$ vertex,
and the three-loop ${\cal O}(\alpha_s^2 G_{\mu} m_t^2)$ calculation for the
$\rho$-parameter.
The structure of this report is determined by a central part
describing the situation for the electroweak observables as obtained
by various independent calculations, including the presently
remaining theoretical uncertainties, followed by comprehensive
descriptions of the QCD aspects of electroweak Z physics and
separate contributions on Bhabha scattering.
In the electroweak part we have tried to give a widely homogeneous
summary for the precision observables.
Comparisons among the various groups of authors for the central values
and the range of uncertainty are documented reflecting the status of our
theoretical knowledge.
This may be understood as concluding a certain period of theoretical
developments and providing a common opinion about the present situation
in the calculation of the precision observables and their theoretical errors.
As a conclusion, we have collected and presented
enough evidences to make the reasonable statement that the
theoretical errors are sufficiently small for the current interpretation of
LEP data, but we are not ready for a High Luminosity LEP or for LEP with
longitudinal beam polarization.
A special section is devoted to Bhabha scattering.
Also for Bhabha scattering a lot of work has been performed after 1989
and crucial improvements have been achieved. Differently to the
electroweak section, progress in Bhabha scattering is presented
as a status report, which is less homogeneous and less final.
It appears as a collection of individual contributions, where
numerical comparisons with each other have not been performed
or are not possible, respectively, at the present stage.
The outline of the book is as follows: It is subdivided into three
major Parts, namely the central electroweak part, the QCD part, and
the part on Bhabha scattering.
The central electroweak documentation is preceded by an experimental overview
on the current situation of electroweak precision measurements
together with the basic requests experimentalists express to theoreticians.
After the electroweak part the QCD corrections are discussed in a section
with several individual contributions. Finally, the progress report
on Bhabha scattering in terms of a series of individual contributions,
preceded by an Introduction, concludes the book.
In the electroweak section, one individual paper is enclosed
calculating the static $\rho$-parameter, $\rho(0)$,
in neutrino scattering beyond the leading 2-loop level, in order
to demonstrate the potential importance of next-to-leading 2-loop
contributions.
The present documentation is the result of a Workshop started at the
very end of 1993 by appeal of experimentalist as a private initiative. The
progress over the subsequent twelve
months and the final report have only become possible by the support of CERN.
We are obliged to CERN for acting as the host of the Workshop and for
publication of the results, in particular to the Theory Division, especially
to Guido Altarelli, John Ellis and Torleif Ericson for their support and
encouragement.
D. Bardin, W. Hollik, G. Passarino
This is from an anonymous referee from Oxford University Press.
The authors of this book have been some of the leading figures in
developing the technology of precision electroweak calculation. This
activity began with the work of Passarino and Veltman in the late
1970's. Bardin and Riemann have been the strongest workers in this
area from the former Eastern bloc, with contributions comparable to
those of the best Western experts Sirlin, Hollik, Jegerlehner, and
Kleiss. Since the beginning of the LEP experiments in 1989, all of these
people have pooled their expertise to provide a solid and carefully
cross-checked foundation for the measurements.