New insight on the Sivers transverse momentum dependent distribution function

Details New insight on the Sivers transverse momentum dependent distribution function New insight on the Sivers transverse momentum dependent distribution function

2010-12-16

arxiv.org/abs/1012.3565v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

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.

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