New insight on the Sivers transverse momentum dependent distribution function

Abstract

Polarised Semi-Inclusive Deep Inelastic Scattering (SIDIS) processes allow to study Transverse Momentum Dependent partonic distributions (TMDs), which reveal a non trivial three dimensional internal structure of the hadrons in momentum space. One of the most representative of the TMDs is the so-called Sivers function that describes the distribution of unpolarized quarks inside a transversely polarized proton. We present a novel extraction of the Sivers distribution functions from the most recent experimental data of HERMES and COMPASS experiments. Using suitable parametrizations, within the TMD factorization scheme, and a simple fitting strategy, we also perform a preliminary exploration of the role of the proton sea quarks.

Talk delivered by M. Boglione at SPIN2010, September 27-October 2, 2010, Juelich, Germany. Left panel of Fig. 5 replaced

References in corpus (10)

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• Transverse spin effects in hard semi-inclusive collisions
• Where do we stand with a 3-D picture of the proton?
• Phenomenology of transverse spin: past, present and future
• Transverse Single Spin Asymmetry in $p+p^{\uparrow }\to J/\psi +X$
• Polarized and unpolarized Drell-Yan angular distribution in the helicity formalism
• Nucleon tomography. What can we do better today than Rutherford 100 years ago?
• Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons
• Probing nucleon spin structure in deep-inelastic scattering, proton-proton collisions and Drell-Yan processes
• Phenomenology of Transverse Momentum Dependent Parton Densities