Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions

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We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in eta and pi0 productions observed by the STAR collaboration at RHIC.

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Kang, Zhong-Bo; Yuan, Feng & Zhou, Jian January 29, 2010.

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We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in eta and pi0 productions observed by the STAR collaboration at RHIC.

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13

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  • Journal Name: Physics Letter B

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  • Report No.: LBNL-3049E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/j.physletb.2010.07.003 | External Link
  • Office of Scientific & Technical Information Report Number: 981743
  • Archival Resource Key: ark:/67531/metadc1015271

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  • January 29, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 17, 2017, 7:01 p.m.

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Kang, Zhong-Bo; Yuan, Feng & Zhou, Jian. Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions, article, January 29, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1015271/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.