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QCD Spin Physics

Our knowledge of the nucleon spin structure has greatly improved over the last twenty years or so, but still many fundamental questions remain unsolved.This means that one has to fully understand it, in terms of the basic partonic constituents of the nucleon, considering the spin as a fundamental quantum number. Simultaneously, the spin sector of the underlying dynamical theory, i .e. perturbative QCD, must be tested at the highest possible precision level.

Our current activities in QCD spin physics involve, in particular, the phenomenological description of polarized parton distributions in the framework of a statistical approach, which was first proposed in 2002. It can be applied equally well to unpolarized and polarized data, a rather unique situation, and it is valid in a wide kinematical range in x and Q2. It has, so far, a very good predictive power, for both Deep Inelastic Scattering and hadronic collisions recent results.

We are also closely associated to the physics programme of the polarized pp collider at RHIC − BNL, operating since 2001, for the measurement of double helicity and single transverse spin asymmetries. It has reached the energy of √s=500GeV, allowing the gauge bosons W± and Z production and the measurement of the parity-violating asymmetries.

We have also a strong interest in the experimental physics programmes of COMPASS (CERN) and JLab upgrade, which will investigate the poorly known high-x region. Finally, let us mention a related topic, namely the systematic study of positivity conditions for spin observables (see Physics Reports 470,1-92 (2009)), which reduces the allowed domain of values, as first observed in 1995 for the case of the quark transversity distributions (Physical Review Letters 74,1292-1294 (1995)).

Invited talks at recent workshop and conferences

International Workshop on Diffraction in High-Energy Physics DIFFRACTION 2016, September 02 - 09, 2016, Acireale, Sicily (Italy)

Parton TMDS at large x: a window into parton dynamics in nucleon structure within QCD, April 11 - 16, 2016 ECT, Trento (Italy)

6th Int. Conf. on Physics Opportunities at an Electron-Ion Collider POETIC VI, September 07 - 11, 2015, Ecole Polytechnique, Palaiseau (France)

16th Conference on Elastic and Diffractive Scattering EDS 2015, June 29 - July 04, 2015, Borgo, Corsica (France)

International Workshop on Diffraction in High-Energy Physics DIFFRACTION 2014, September 10 - 15, 2014, Primosten (Croatia)

5th International Workshop on High Energy Physics in the LHC area, December 16 - 23, 2013, UTFSM Valparaiso (Chili)

QCD Evolution Workshop 2014, May, 12 - 16, 2014, Santa Fe, New Mexico (USA)

XV Advanced research Workshop on High Energy Spin Physics DSPIN-13, October 08 - 12, 2013, Dubna (Russia)

XXI International Workshop on Deep Inelastic Scattering and related subjects DIS2013, April 22-26, 2013, Marseille (France)

International Workshop on Diffraction in High-Energy Physics DIFFRACTION 2012, September 10 - 15, 2012, Puerto del Carmen, Lanzarote, Canary Islands (Spain)

14th Workshop on Elastic and Diffractive scattering ( EDS Blois Workshop), December 15 - 21, 2011, Qui Non (Vietnam)

XIV Advanced Research Workshop on High Energy Spin Physics DSPIN-11, September 20 - 24, 2011, Dubna (Russia)

3rd International Workshop on Nucleon Structure at Large Bjorken x HiX2010, October 13 - 15, 2010, Jefferson Lab, Newport News, Virginia (USA)

International Workshop on Diffraction in High-Energy Physics DIFFRACTION 2010, September 10 - 15, 2010, Otranto, (Italy)

Nucleon Spin Physics-Summer program at BNL, July 14 - 27, 2010, Brookhaven National Laboratory, Upton, NY (USA)

Progress in High-pt Physics at RHIC, March 17 - 19, 2010, Brookhaven National Laboratory, Upton, NY (USA)

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