Global fitting of single spin asymmetry: An attempt

Spin and Isospin Asymmetry, Equation of State and Neutron Stars

In the present work, we have obtained the equation of state for neutron star matter considering the in uence of the ferromagnetic and antiferromagnetic spin state. We have also investigated the structure of neutron stars. According to our results, the spin asymmetry stiens the equation of state and leads to high mass for the neutron star.

Single Spin Asymmetry In Inclusive Pion Production ∗

It is shown how the single spin asymmetry observed in inclusive pion production is related, in the helicity basis, to the imaginary part of the product of two different distribution amplitudes, rather than to the usual quark and gluon distribution functions; there is then no reason why it should be zero even in massless perturbative QCD, provided the quark intrinsic motion is taken into account...

Single spin asymmetry of vector meson production as a probe of asymmetry of parton scattering

Azimuthal asymmetry of vector-meson production in single-transversely polarized proton-proton collisions (p↑p) is calculated in the string model of particle production. The asymmetry is generated only during fragmentation of a high-energy quark into hadrons. The obtained asymmetry of the ρ is opposite in sign to that of π mesons. On the other hand, an asymmetry appearing during parton scatterin...

SINGLE SPIN ASYMMETRY FOR p ↑ p → πX IN PERTURBATIVE QCD

Within the QCD-improved parton model and assuming the factorization theorem to hold in the helicity basis and for higher twist contributions, we show how non zero single spin asymmetries in hadron-hadron high energy and moderately large pT inclusive processes can be obtained, even in massless perturbative QCD, provided the quark intrinsic motion is taken into account. A simple model is construc...

Collins Fragmentation and the Single Transverse Spin Asymmetry