Beam-Target Double-Spin Asymmetry A(Lt) In Charged Pion Production From Deep Inelastic Scattering On A Transversely Polarized He-3 Target At 1.4 < Q(2) < 2.7 Gev2

Jin Huang,Kalyan Allada,Chizuko M. Dutta,Joseph Katich,Xin Qian,Yingxiao Wang,Yan Zhang,K. A. Aniol,John R M Annand,Todd D. Averett,Fatiha Benmokhtar,William Bertozzi,P. C. Bradshaw,Peter E. Bosted,A. Camsonne,M. Canan,Gordon D. Cates,Chinhao Chen,Jianping Chen,Wuying Chen,K. Chirapatpimol,Eugene A. Chudakov,Evaristo Cisbani,J. C. Cornejo,Francesco Cusanno,Mark M. Dalton,Wouter Deconinck,C. W. De Jager,Raffaele De Leo,Xiaoyan Deng,Alexandre P. Deur,Haifeng Ding,P. A M Dolph,Dipangkar Dutta,L. El Fassi,Salvatore Frullani,Haiyan Gao,Franco Garibaldi,David R. Gaskell,Shalev Gilad,Ronald Gilman,O. Glamazdin,Serkan Golge,Liqin Guo,David J. Hamilton,Ole Per Hansen,Douglas W. Higinbotham,Timothy K. Holmstrom,MeiNa Huang,Heide F. Ibrahim,Marino Iodice,Xiaodong Jiang,Guoqiang Jin,Morgan K. Jones,A. M. Kelleher,Wan Kim,Ameya Kolarkar,Wolfgang Korsch,John J. Lerose,Xueqin Li,YunJu Li,R. A. Lindgren,Nilanga Liyanage,E. Long, HaiJiang Lü,Demetrius J. Margaziotis,P. E C Markowitz,Stefano Marrone,Daniel E. McNulty,Zein Eddine Méziani,Robert W. Michaels,Bryan J. Moffit,C. Muñoz-Camacho,Sirish K. Nanda,A. Narayan,V. V. Nelyubin,Blaine E. Norum,YD Oh,Mikhail V. Osipenko,D. S. Parno,Jen-Chieh Peng,S. K. Phillips,M. Posik,Andrew J R Puckett,Yi Qiang,Abdurahim Rakhman,R. D. Ransome,S. Riordan,Arun Saha,B. D. Sawatzky,E. C. Schulte,A. R. Shahinyan,Maryam Hashemi Shabestari,S. Åirca,S. G. Stepanyan,Ramesh R. Subedi,Vincent A. Sulkosky,LiGuang Tang,A. Tobias,G. Maria Urciuoli,I. Vilardi,Kebin Wang,Bogdan B. Wojtsekhowski,Xinhu Yan,Huan Yao,Yunxiu Ye,Z. G. Ye,LungChi Yuan,Xiaohui Zhan,Ye Zhang,B. Zhao,Xiaoguang Zheng,Lingyan Zhu,Xiangxue Zhu,X. Zong

PHYSICAL REVIEW LETTERS（2012）

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摘要

We report the first measurement of the double-spin asymmetry A(LT) for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized He-3 target. The kinematics focused on the valence quark region, 0.16 < x < 0.35 with 1.4 < Q(2) < 2.7 GeV2. The corresponding neutron A(LT) asymmetries were extracted from the measured He-3 asymmetries and proton over He-3 cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function g(1T)(q) and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for pi(-) production on He-3 and the neutron, while our pi(+) asymmetries are consistent with zero.

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