期刊
PHYSICS LETTERS B
卷 713, 期 3, 页码 317-320出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2012.06.003
关键词
Semi-inclusive DIS; Target fragmentation; Fracture functions; Polarization; Transverse momentum
资金
- European Community - Research Infrastructure Activity under the FP6 Program Structuring the European Research Area (HadronPhysics) [RII3-CT-2004-506078]
- Italian Ministry of Education, University and Research (PRIN)
- Helmholtz Association [VH-VI-231]
- Regione Piemonte
We show that a new beam-spin asymmetry appears in deep inelastic inclusive lepto-production at low transverse momenta when a hadron in the target fragmentation region is observed in association with another hadron in the current fragmentation region. The beam leptons are longitudinally polarized while the target nucleons are unpolarized. This asymmetry is a leading-twist effect generated by the correlation between the transverse momentum of quarks and the transverse momentum of the hadron emitted by the target. Experimental signatures of this effect are discussed. (c) 2012 Elsevier B.V. All rights reserved.
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