Measurement of “pretzelosity” asymmetry of charged pion production in semi-inclusive deep inelastic scattering on a polarized He3 target

Y. Zhang et al. (Jefferson Lab Hall A Collaboration)
Phys. Rev. C 90, 055209 – Published 24 November 2014

Abstract

An experiment to measure single-spin asymmetries of semi-inclusive production of charged pions in deep-inelastic scattering on a transversely polarized He3 target was performed at Jefferson Laboratory in the kinematic region of 0.16<x<0.35 and 1.4<Q2<2.7 GeV2. Pretzelosity asymmetries on He3, which are expressed as the convolution of the h1T transverse-momentum-dependent distribution functions and the Collins fragmentation functions in the leading order, were measured for the first time. Under the effective polarization approximation, we extracted the corresponding neutron asymmetries from the measured He3 asymmetries and cross-section ratios between the proton and He3. Our results show that both π± on He3 and on neutron pretzelosity asymmetries are consistent with zero within experimental uncertainties.

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  • Received 12 December 2013
  • Revised 11 October 2014

DOI:https://doi.org/10.1103/PhysRevC.90.055209

©2014 American Physical Society

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Vol. 90, Iss. 5 — November 2014

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