Double-spin cosφ asymmetry in semi-inclusive electroproduction
نویسندگان
چکیده
We consider the double-spin cosφ asymmetry for pion electroproduction in semi-inclusive deep inelastic scattering of longitudinally polarized leptons off longitudinally polarized protons. We estimate the size of the asymmetry in the approximation where all twist-3 interaction-dependent distribution and fragmentation functions are set to zero. In that approximation at HERMES kinematics a sizable negative cosφ double-spin asymmetry for π+ electroproduction is predicted. 2002 Published by Elsevier Science B.V. PACS: 13.87.Fh; 13.60.-r; 13.88.+e; 14.20.Dh
منابع مشابه
Chiral-odd Fragmentation Functions in Single Pion Inclusive Electroproduction
We consider a sub-leading twist chiral-odd pion fragmentation function and explore its contribution in single pion semi-inclusive electroproduction. We evaluate the single beam-spin azimuthal asymmetry ALU and the double spin asymmetry ALT in polarized electroproduction of pions from an unpolarized and transversely polarized nucleon respectively. The beam asymmetry is expressed as the product o...
متن کاملar X iv : h ep - p h / 02 11 40 2 v 1 2 6 N ov 2 00 2 Perturbative and Nonperturbative Aspects of Azimuthal Asymmetries in Polarized ep
We discuss the possibilities of testing of perturbative quantum chromodynamics through azimuthal asymmetries in polarized ep in the context of future collider and fixed target facilities, such as Electron Ion Collider and TESLA-N. It is widely recognized that the study of the distributions in the azimuthal angle φ of the detected hadron in hard scattering processes provide interesting variables...
متن کاملSingle/Double-Spin Asymmetry Measurements of Semi-Inclusive Pion Electroproduction on a Transversely Polarized He Target through Deep Inelastic Scattering
Parton distribution functions, which represent the flavor and spin structure of the nucleon, provide invaluable information in illuminating quantum chromodynamics in the confinement region. Among various processes that measure such parton distribution functions, semi-inclusive deep inelastic scattering is regarded as one of the golden channels to access transverse momentum dependent parton dist...
متن کاملAzimuthal Asymmetries in Inclusive Single Pion Electroproduction
The leading and sub-leading order results for pion electroproduction in polarized and unpolarized semi-inclusive deep-inelastic scattering, are considered putting emphasis on transverse momentum dependent effects appearing in azimuthal asymmetries. In particular the spin-dependent (single, double) and spin-independent asymmetries of the distributions in the azimuthal angle φ of the pion related...
متن کاملTransversity Distribution and Polarized Fragmentation Function from Semi-inclusive Pion Electroproduction
A method is discussed to determine the hitherto unknown u-quark transversity distribution δu(x) from a planned HERMES measurement of a single target-spin asymmetry in semi-inclusive pion electroproduction off a transversely polarized target. Assuming u-quark dominance, the measurement yields the shapes of the transversity distribution δu(x) and of the ratio H 1 (z)/D u 1 (z), of polarized and u...
متن کامل