Inclusive neutrino and antineutrino processes and the problem of the spin of proton * Abstract The inclusive NC and CC neutrino(antineutrino)-nucleus scattering for the case of a nucleus with isotopic spin equal to zero is considered. It is shown that the measurement of the neutrino-antineutrino asymmetry at relatively small energies could allow to obtain model-independent information about the...

A formula for the single transverse spin asymmetry in the large-pT pion production in the nucleon-nucleon collision is derived. We focuss on the chiral-odd contribution where the transversity distribution and the chiral-odd spin-independent twist-3 distribution contributes. This contribution is expected to give rise to a large effect at xF → −1. PACS numbers: 12.38.-t, 12.38.Bx, 13.85.Ni, 13.88...

Here we describe diffractive measurements at RHIC in proton+proton collisions with a special optics run of β ∼ 21 m at STAR, at the centerof-mass energy √ s = 200 GeV during the the RHIC 2009 run. We present published results of single spin asymmetry as well as preliminary results on double spin asymmetries and central exclusive production. PACS number(s): 13.85.Dz and 13.88.+e

Effects of the large gluon polarization on xg d 1 (x) and J/ψ productions at polarized ep and pp collisions Abstract The recent SMC data of xg d 1 (x) are reproduced with the large polarized gluons. To study further the polarized gluon distribution in a proton, we calculate the spin–dependent differential cross section for J/ψ leptoproductions and the two–spin asymmetry for J/ψ hadroproductions...

A dominant QCD mechanism for the single transverse-spin asymmetry in hard processes is induced by the twist-3 quark-gluon correlations inside nucleon, combined with the soft-gluonic poles to produce the interfering phase for the associated partonic hard scattering. It is shown that the corresponding interfering amplitude can be calculated entirely in terms of the partonic Born cross section whi...

The electron structure function method is applied to calculate model–independent radiative corrections to an asymmetry of electron–proton scattering. The representations for both spin–independent and spin–dependent parts of the cross–section are derived. Master formulae take into account the leading corrections in all orders and the main contribution of the second order next–to–leading ones and...

We present an estimate of a chiral-odd contribution to the single transverse spin asymmetry in the large-pT pion production in the nucleon-nucleon collision. In this contribution the transversity distribution and the chiral-odd spin-independent twist-3 distribution appear. Because of the smallness of the corresponding hard cross section, this term turned out to be negligible in all kinematic re...

We discuss transverse polarization distribution and fragmentation functions, in particular, T-odd functions with transverse momentum dependence, which might be relevant for the description of single transverse spin asymmetries. The role of intrinsic transverse momentum in the expansion in inverse powers of the hard scale is elaborated upon. The sin single spin asymmetry in the process e p! e′ +...

We perform a comparative study of the spin relaxation by spin-orbit coupling induced from adatoms (hydrogen and fluorine) in graphene. Two methods are applied, giving consistent results: a full quantum transport simulation of a graphene nanoribbon, and a T-matrix calculation using Green’s functions for a single adatom in graphene. For hydrogenated graphene the dominant spinorbit term for spin r...

It is shown that the existence of left-right asymmetry in single-spin inclusive Lambda production, together with the characteristic features of the data, should be considered as another clear signature for the existence of orbiting valence quarks in polarized nucleons. Predictions for other hyperons are made. It is pointed out that measurements of such asymmetries are very helpful not only for ...