First of all, I want to apologize: this page is not meant for general udience but only for internal review ...


    A short introduction
  1. 27-6-74 Italian Diploma from the Physics Department of Torino University with a thesis on Renormalization Group and Phase Transitions ,
  2. 1-11-74 to 24-12-81 Junior researcher ( Assegno di formazione scientifica e didattica) at the Institute for Theoretical Physics, Torino. University
  3. 1-1-76 to 31-10-77 on leave from Torino, researcher at the Institute for Theoretical Physics, Utrecht University (NL).
  4. 24-12-81 Researcher ( ricercatore confermato) at the Institute for Theoretical Physics, Torino.
  5. 1-10-82 to 31-9-83 INFN Fellow at SLAC (Stanford University).
  6. 1-3-84 to 31-6-84 Visiting Scientist at the Physics Departemnt, University of Michigan.
  7. 1-3-86 to 31-9-86 Visiting Scientist at the Physics Department, University of Michigan.
  8. 1-7-87 to 31-9-87 Visiting Scientist at the Physics Department, University of Michigan.
  9. 1-8-88 to 31-9-88 Visiting Scientist at the Physics Department, University of Michigan.
  10. 1-5-91 to 31-5-91 Visiting Scientist at the Physics Department, University of Michigan.
  11. 1-10-96 Associate Professor, Department of Theoretical Physics, Torino University.
  12. 28-12-99 Universita' degli Studi di ROMA "Tor Vergata"
    Concorso ad un posto da Professore Ordinario presso la FacoltÓ di SCIENZE MATEMATICHE FISICHE e NATURALI , settore disciplinare B02A: FISICA TEORICA
    n. domande candidati 28
    Idonei: PASSARINO Gian Piero, SAGNOTTI Augusto, VULPIANI Angelo

  13. 1-11-00 Full Professor, Department of Theoretical Physics, Torino University.

    Oldies but Goldies:
  1. Les Houches Summer School 75, Methods in Field Theory
  2. Cargese Summer School 76, Recent Developments in Field Theory and Statistical Mechanics .

    Most recent Workshops and Conferences.
  1. Ringberg workshop "Electroweak Radiative Corrections", Ringberg Castle Germany April 3-7 1989.
  2. Workshop on QED Structure Functions, Ann Arbor, Michigan, May 22-25, 1989.
  3. XXVIth Recontre de Moriond, Les Arcs, Savoie, March 11-17,1991.
  4. Ringberg Workshop on High Precision vs. High Energy in $e^+e^-$ Collisions, Ringberg, April 15-19, 1991.
  5. Conference on Gauge Theories - Past and Future, Ann Arbor, 16-18 May, 1991.
  6. 91 Electroweak Interactions and Unified Theories, Les Arcs France March 11-17 1991.
  7. Joint International Lepton-Photon Symposium \& Europhysics Conference on High Energy Physics, Geneva, Switzerland, 25 July - 1 August 1991.
  8. SSC Physics Symposium, Wisconsin, Madison, April 13-15, 1992.
  9. Workshop on Perspectives of the Electroweak Interaction in $e^+e^-$ Collisions, Ringberg 4-8 April,1993.
  10. Elementary Particles, Quantum Fields and Statistical Mechanics, Lectures given at the Summer School in Theoretical Physics, Parma 1991-1993.
  11. 1994 Zeuthen Workshop on Elementary Particle Theory, Teupitz Germany 10-15 April 1994.
  12. 27th International Conference on High Energy Physics, Glasgow, 20-27th July 1994.
  13. Working Group on Precision Calculations for the $Z$-resonance, CERN 1995.
  14. Ringberg Workshop on "Perspectives for Electroweak Interactions in $e^+e^-$ Collisions", Ringberg Castle Germany 5-8 February 1995.
  15. XIXth International Conference on Theoretical Physics, Szczyrk 19-26 September 1995.
  16. XV Workshop on Weak Interactions and Neutrinos, Talloires France 4-8 September 1995.
  17. International Europhysics Conference on High Energy Physics, Brussels Belgium 27 July - 2 August 1995.
  18. Workshop in Physics at LEP2, CERN 96.
  19. 28th International Conference on High Energy physics, Warsaw Poland 25-31 July 1996.
  20. 3rd International Symposium on Radiative Corrections, Cracow, Poland, August 1-5, 1996.
  21. Cracow Epiphany Conference on W Boson, Krakow, Poland, January 4-6, 1997
  22. XVI Workshop on Weak Interactions and Neutrinos, Capri Italy 22-28 June 1997.
  23. IV International Symposium on Radiative Corrections, Barcelona Spain 8-12 September 1998.

    Convener of:
  1. XV Workshop on Weak Iteractions and Neutrinos, Talloires France 4-8 September 1995: Convener of Working Group WG1 (with A.Blondel).
  2. 28th International Conference on High Energy Physics, Warsaw Poland 25-31 July 1996: Convener of Parallel Session Pa-07 (with J. Urheim).
  3. 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

(CERN yellow report CERN/95-03)

The Workshop on Physics at LEP2

(CERN yellow report CERN/96-01) Standard Physics Event Generators

My list of publications.

  1. G.Passarino and M.Veltman, Nucl. Phys. B160(1979)151.
  2. G.Passarino, Nucl. Phys. B204(1982)237.
  3. M.Consoli and G.Passarino, Phys. Lett. B117(1982)257.
  4. G.Passarino, Nucl. Phys. B224(1983)265.
  5. G.Passarino, Phys. Rev. D28(1983)2867.
  6. G.Passarino, Phys. Lett. B130(1983)115.
  7. G.Passarino, Nucl. Phys. B237(1984)249.
  8. G.Passarino, Nucl. Phys. B241(1984)48.
  9. G.Passarino, University of Michigan preprint UM TH 84-8.
  10. A.Ballestrero and G.Passarino, Phys. Lett. 148B(1984)373.
  11. A.Ballestrero and G.Passarino, Phys. Lett. 148B(1984)378.
  12. G.Passarino, Phys. Lett. 152B(1985)271.
  13. G.Passarino, Phys. Lett. 156B(1985)231.
  14. G.Passarino, Phys. Lett. 161B(1985)341.
  15. M.Consoli and G.Passarino, Phys. Lett 165B(1985)113.
  16. G.Passarino, Talk given at the Torino Meeting on Superunification and Extra Dimensions.
  17. G.Passarino, Phys. Lett. 176B(1986)135.
  18. G.Passarino, Phys. Lett. 183B(1987)375.
  19. G.Passarino, Nucl. Phys. B284(1987)473.
  20. G.Passarino, Phys. Lett. 195B(1987)191.
  21. G.Passarino, Phys. Lett. 197B(1987)409.
  22. G.Passarino, Nucl. Phys. B304(1988)557.
  23. G.Passarino, Torino preprint DFTT/G-88-1.
  24. G.Passarino and R.Pittau, Phys. Lett. 215B(1988)154.
  25. G.Passarino, Talk given at the LEP-Parma Meeting, 13-14 October 1988.
  26. G.Passarino, Radiative Corrections for $e^+e^-$ Collisions, ed. J.H. K\"uhn, Springer-Verlag 1989, p. 179.
  27. G.Passarino and R.Pittau, Phys. Lett. 228B(1989)89.
  28. G. Passarino, Phys. Lett. 231B(1989)458.
  29. G. Passarino, QED Structure Functions, ed. G.Bonvicini, AIP Conference Proceedings no.201 1990, p. 132.
  30. G. Passarino, Contributed paper to the International Europhysics Conference on High Energy Physics, Madrid, September 6-13, 1989.
  31. G. Passarino and M. Veltman, Phys. Lett. 237B(1990)537.
  32. G. Passarino, Nucl. Phys. B343(1990)31.
  33. G. Passarino, Phys. Lett. B247(1990)587.
  34. G. Passarino, Phys. Lett. B255(1991)127.
  35. G. Passarino, Nucl Phys. B361(1991)351.
  36. G. Passarino, In '91 Electroweak Interactions and Unified Theories, J.Tran Thanh Van ed., p. 119 (Edition Frontieres).
  37. 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.
  38. G. Passarino, In Gauge Theories - Past and Future, R. Akhoury et al. eds., p. 171 (World Scientific 1992).
  39. 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)
  40. M. Cacciari, G. Montagna, O. Nicrosini and G. Passarino, Phys. Lett. B279(1992)384.
  41. M. Cacciari, G. Montagna, O. Nicrosini, G. Passarino and R. Pittau, Phys. Lett. B286(1992)387.
  42. G. Montagna, O. Nicrosini and G. Passarino, Phys. Lett. B309(1993)436.
  43. G. Montagna, O. Nicrosini and G. Passarino, Phys. Lett. B303(1993)170.
  44. G. Passarino, Z. Phys. C26(1994)229.
  45. G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini and R. Pittau, Nucl. Phys. B401(1993)3.
  46. G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini and R. Pittau, Comput. Phys. Commun. 76(1993)328.
  47. 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.
  48. G. Passarino, Phys. Lett. B313(1993)213.
  49. O. Nicrosini, G. Passarino and F. Piccinini, Torino preprint, DFTT/G-93-6.
  50. 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.
  51. T. Hebbeker, M. Martinez, G. Passarino and G. Quast, Phys. Lett. B331(1994)165.
  52. G. Passarino, Nucl. Phys. B(Proc. Suppl.) 37B(1994)32.
  53. G. Montagna, O. Nicrosini, G. Passarino and F. Piccinini, Phys. Lett. B355(1994)484.
  54. 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.
  55. G. Montagna, O. Nicrosini, G. Passarino and F. Piccinini, Phys. Lett. B348(1995)178.
  56. 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.
  57. 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.
  58. G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini, Comput. Phys. Commun. 93(1996)120.
  59. E. Argires et al., Phys. Lett. B358(1995)339.
  60. G. Passarino, talk given at the XIXth International Conference on Theoretical Physics, Szczyrk 19-26 September 1995, Acta Phys. Pol. B27(1996)1605.
  61. 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.
  62. 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.
  63. 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.
  64. 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.
  65. 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.
  66. G. Passarino, Physics, Comp. Phys. Comm. 97(1996)261.
  67. E. Accomando, A. Ballestrero and G. Passarino, Nucl. Phys. B476(1996)3.
  68. G. Passarino, hep-ph/9604344.
  69. 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.
  70. G. Passarino, hep-ph/9611248, Nucl. Phys. B488(1997)3.
  71. 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.
  72. W. Beenakker and G. Passarino, Phys. Lett. B425(1998)199.
  73. 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.
  74. D. Bardin and G. Passarino, hep-ph/9803425.
  75. G. Montagna, O. Nicrosini, G. Passarino, F. Piccinini, hep-ph/9804211.
  76. G. Passarino, Nucl. Phys. B(Proc. Suppl.) 66(1998)87.
  77. G. Passarino, hep-ph/9810416.
  78. D. Bardin, M. Gruenewald and G. Passarino, hep-ph/9902452.
  79. 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.
  80. G. Passarino, The Twofold Way, a Short Disquisition of LEP Physics hep/ph-9911310.
  81. G. Passarino, Unstable Particles and Non-Conserved Currents: A Generalization of the Fermion-Loop Scheme, hep-ph9911482.

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Computer Programs


  1. 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.}


  2. 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.




A BOOK is being written, have a look ...





Get an idea of the impact .....

    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.

Have a look at TOPAZ0 impact Click here ....




Have a look at Passarino-Veltman functions Click here .... or Click here ....



Some of the people who studied with me


R. Pittau
M. Passera
F. Piccinini