1,721,121 research outputs found
Extraction of the Sivers functions with TMD evolution
No full textThe QCD evolution of the unpolarized Transverse Momentum Dependent (TMD) distribution and fragmentation functions and of the Sivers function have been discussed in recent papers [1, 2, 3, 4]. Following these results we reconsider previous extractions of the Sivers function from SIDIS data and propose a simple strategy which allows to take into account the Q2 dependence of the TMDs. Clear evidence of the TMD evolution can be seen in the available data, mostly in the newest COMPASS results for Semi Inclusive Deep Inelastic Scattering (SIDIS) off a transversely polarized proton target
A strategy towards the extraction of the Sivers function with TMD evolution
Full text linkThe QCD evolution of the unpolarized transverse momentum dependent (TMD) distribution functions and of the Sivers functions have been discussed in recent papers. Following such results we reconsider previous extractions of the Sivers functions from semi-inclusive deep inelastic scattering data and propose a simple strategy which allows to take into account the Q2 dependence of the TMDs in comparison with experimental findings. A clear evidence of the phenomenological success of the TMD-evolution equations is given, mostly, by the newest COMPASS data off a transversely polarized proton targe
Phenomenology of Sivers Effect with TMD Evolution
No full textFollowing the TMD evolution scheme recently proposed for the unpolarized and the Sivers distribution function, we propose a simple strategy to take into account this TMD Q2 dependence in our phenomenological extraction of the Sivers function from SIDIS data. New results are presented and possible future applications are discussed
PRIN 2008 - Studio di effetti di spin e impulso trasversi nel nucleone attraverso reazioni DIS semi-inclusive ep -> e'hX, processi di Drell-Yan pbar p -> l+ l- e scattering elastico pbar p.
No full textIl progetto si propone di raccogliere fisici teorici e sperimentali coinvolti in investigazioni sulla funzione trasversita' del protone
Non-standard time reversal for particle multiplets and the spin-flavor structure of hadrons
No full textWe show that a system of quarks interacting with chiral fields provides a physical representation of a “non-standard” time reversal for particle multiplets proposed by Weinberg. As an application, we argue that, if the internal structure of hadrons is described by a chiral lagrangian, the so-called time-reversal-odd quark distribution functions might not be forbidden by time-reversal invariance
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