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Guido Altarelli (born July 12, 1941 in Rome) is an Italian theoretical physicist now at the Universita' di Roma Tre and CERN. His best known contribution, obtained with Giorgio Parisi in 1977, is the derivation of the QCD evolution equations for parton densities, known as the Altarelli- Parisi or DGLAP equations.

He graduated in Physics from Rome University in 1963 with Raoul Gatto whom he followed to the University of Florence (1965-68). He held positions at New York University (1968-69), the Rockefeller University (New York, 1969-70), the University “La Sapienza” in Rome (1970-92), l’Ecole Normale Superieure in Paris (76-77, 81) and Boston University (85-86). He was Director of the Rome Section of the INFN (1985-87). In 1987-2006 he was a Senior Staff Physicist at the Theory Division of CERN, and was Theory Division Leader from 2000-04.

His research achievements cover a broad range of problems in the phenomenology of particle interactions within and beyond the Standard Model, in close connection with experiment. For example: - QCD: besides the parton evolution equations, he has worked on corrections to the weak non-leptonic effective Hamiltonian (with Luciano Maiani), on the theory of Drell-Yan processes (with Richard K. Ellis and Guido Martinelli) , on polarized parton densities (with Graham Ross) , on structure functions at small-x (with Richard Ball and Stefano Forte) …. - Electroweak interactions: he has contributed to the theory of precision tests, in particular to epsilon parameters (with Riccardo Barbieri), weak decays , theoretical bounds on the Higgs mass …. - Neutrino masses and mixings (with Ferruccio Feruglio), Grand Unified Theories, Physics beyond the SM…. At CERN he had a leading role in the interpretation of SppS results, in the preparation of LEP and the LHC and in the theoretical analysis of LEP results.

Awards

 * Member of the Polish Academy of Sciences
 * 2011 Julius Wess Award for Outstanding Achievements in Elementary Particle and Astroparticle Physics - The Karlsruhe Institute of Technology
 * 2012 J.J. Sakurai Prize for Theoretical Particle Physics - The American Physical Society