Quark helicity flip and the transverse spin dependence of inclusive dis

A. Afanasev, M. Strikman, C. Weiss

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Inclusive DIS with unpolarized beam exhibits a subtle dependence on the trans- verse target spin, arising from the interference of one{photon and two{photon exchange amplitudes in the cross section. We argue that this observable probes mainly the quark helicityflip amplitudes induced by the non-perturbative vacuum structure of QCD (spontaneous chiral symmetry breaking). This conjecture is based on (a) the absence of significant Sudakov suppression of the helicityflip process if soft gluon emission in the quark subprocess is limited by the chiral symmetry breaking scale μ2 chiral ≫ ∧2 QCD; (b) the expectation that the quark helicity-conserving twist{3 contribution is small. The normal target spin asymmetry is estimated to be of the order 10-4 in the kinematics of the planned Jefferson Lab Hall A experiment.

Original languageEnglish (US)
Title of host publicationExclusive Reactions at High Momentum Transfer - Proceedings of the International Workshop
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages173-180
Number of pages8
ISBN (Print)9812796940, 9789812796943
DOIs
StatePublished - 2008
Event2007 International Workshop on Exclusive Reactions at High Momentum Transfer - Newport News, VA, United States
Duration: May 21 2007May 24 2007

Publication series

NameExclusive Reactions at High Momentum Transfer - Proceedings of the International Workshop

Other

Other2007 International Workshop on Exclusive Reactions at High Momentum Transfer
CountryUnited States
CityNewport News, VA
Period5/21/075/24/07

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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