## Barbieri Riccardo

**Riccardo Barbieri**

Palazzo della Carovana

phone. 050 509243

fax. 050 563513

e-mail: r.barbieri A_T sns D_O_T it

Professore ordinario di Fisica Teorica alla Scuola Normale dal 1997. Normalista, è stato visiting professor presso l’École Normale Superieure, staff member al CERN, professore di Fisica Teorica all’Università di Pisa e Miller Professor all’Università di Berkeley. E’ stato Chairman del Comitato Scientifico del Laboratorio del Gran Sasso dell’INFN e dell’Astro-particle Physics European Coordination. Ha ottenuto il premio von Humboldt.

I suoi principali interessi di ricerca riguardano la fisica teorica delle particelle ed in particolare le estensioni del Modello Standard per le interazioni tra particelle elementari e le connessioni con l’astrofisica e la cosmologia.

### The Professor

Born in Parma (Italy) in 1944.

Married, 3 children.

Laurea in Physics at the University of Pisa in 1967

Ph.D. in Physics at the Scuola Normale Superiore in Pisa in 1969.

Professor of Theoretical Physics at the Scuola Normale Superiore, Pisa from 1998

Professor of Theoretical Physics at the University of Pisa from 1984 to 1997

Muller Professor at the University of Berkeley in 1994

Visiting Professor at the Ecole Normale (Paris) in 1983-84

Staff member at the Theory Division of CERN from 1980 to 1982

Member of the Scientific Committee of various Institutions (Gran Sasso, L’Aquila – 1991-1995; CERN, Geneva – 1995-2001; LAL, Orsay – 1997-2001; ICTP, Trieste – 2003-currently; IPhT-CEA-Paris - 2001 -currently; P2I - Paris - 2008 - currently; Pauli Center - ETH, Zurich - 2008 - currently).

Chairman of the Scientific Committee of the Gran Sasso Laboratory, L’Aquila – 1996-2000

Chairman of the the Scientific Committee of the Astro-particle Physics European Coordination - 2001-2005.

von Humboldt awardee - 2005.

**Plenary talks at main international conferences:**

Lepton-Photon Symposium, Itacha 1983, “Unconventional weak interactions”

EPS – HEP, Madrid 1989, “Electroweak Interactions”

Lepton-Photon Symposium, Hamburg 1997, “Unified Theories”

Lepton-Photon Symposium, Rome 2001, “Quark masses and weak couplings in the Standard Model and beyond”

ICHEP, Beijing 2004, “Searching for new physics at future accelerators”

**Main scientific contributions:**

Riccardo Barbieri has written about two hundred research papers in the field of theoretical elementary particle physics, with an average number of 80 citations per paper, for a total of about 16.000 citations (and an H-index of 71, the highest among the about 3000 physicists in Italian Universities, according to a recent study). His scientific activity is characterized by a wide range of interests and a constant attention to the relation between theory and experiment. Among his most relevant and influential contributions are:

- In 1976, the prediction, later experimentally verified, of the hadronic widths of the three charmonium P-waves , following the work of Appelquist and Politzer on the width of the J/ψ. The two independent ratios of these widths are characteristic QCD numbers that have been important in establishing QCD beyond its incorporation of the parton model (with R. Gatto and R. Kogerler, 231 cit.s and with R. Gatto and E. Remiddi, 248 cit.s). Still in the seventies, this work has been extended by including the one loop corrections to the hadronic widths of the charmonia, which may have been the first examples of next-to-leading QCD calculations (with E. d’Emilio, G. Curci, R. Gatto and E. Remiddi, 225 cit.s).
- In 1982, the formulation of the first fully realistic model of the fundamental interactions based on supergravity. This work establishes the general connection, via the supergravity interactions, between a hidden sector with breaking of supersymmetry and the soft supersymmetry breaking terms at the Fermi scale, i.e. the supergravity-based Minimal Supersymmetric Standard Model (with S. Ferrara and C. Savoy, 1048 cit.s).
- In 1988, the quantitative formulation of the naturalness concept in the MSSM, allowing to attribute, to the best that we can tell, quantitative significance to the relevant range for the supersymmetric particle masses (with G. Giudice, 391 cit.s).
- In 1989, the identification and the calculation of the main model independent contribution to the cross section with a nucleus of a dark-matter neutralino due to the Higgs boson exchange (with M. Frigeni and G. Giudice, 104 cit.s).
- In 1990, the first calculation , simultaneous and independent from the work of other authors, of the radiative corrections to the supersymmetric Higgs potential with use of the renormalization group, crucial to establish the upper bound on the mass of the lightest Higgs scalar (with M. Frigeni and A. Caravaglios, 376 cit.s).
- In 1990-91, a first discussion of neutrino oscillations in the early universe, crucial to determine the decoupling properties of a partially sterile neutrino from the primordial plasma, so as to set, e.g., bounds on sterile neutrino masses and mixings from Big Bang Nucleosynthesis (with A. Dolgov, 178 cit.s)
- In 1991-1993, the formulation of a reference parametrization of the radiative corrections to the electroweak precision observables , complementary but also crucially different from the one of Peskin and Takeuchi, normally used in setting constraints on theories of ElectroWeak Symmetry Breaking (with G. Altarelli, 513 cit.s).
- In 1994, the significance pointed out of flavour and CP violations in supersymmetric unified theories even in absence of any flavour or CP violation in the input for the soft-supersymmetry breaking parameters . By showing the relevant range of the expected signals, this has provided new motivation to the searches for the µ → e + γ decay or for the electric dipole moments (with L. Hall, 343 cit.s and with L. Hall and A. Strumia, 391 cit.s).
- In 2001, the formulation of a constrained supersymmetric standard model of the electroweak interactions based on a compact extra dimension, with supersymmetry broken à la Scherk and Schwarz, making more concrete previous work by Antoniadis et al (with L. Hall and Y. Nomura, 225 cit.s)
- In 2006, the proposal of a minimal Dark Matter model based on a second Higgs doublet without vacuum expectation value and with an associated parity symmetry (with L. Hall and V. Rychkov, 150 cit.s).