Proceedings of the 21st International Symposium on Spin Physics (SPIN2014); Peking University, China, 20–24 October 2014; Editors: Haiyan Gao and Bo-Qiang Ma — Session 3Open Access

Measurement of Collins Asymmetries in Inclusive Production of Charged Pion Pairs at BESIII

Yinghui Guan

Yinghui Guan on behalf of the BESIII Collaboration

Institute of High Energy Physics, Beijing, China

E-mail Address: guanyh@ihep.ac.cn

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https://doi.org/10.1142/S2010194516600338Cited by:0 (Source: Crossref)

Abstract

We present the preliminary results of the measurement of the azimuthal asymmetries of two charged pions in the inclusive process $e^{+} e^{-} \to π π X$ $e^{+} e^{-} \to π π X$ in the BESIII experiment. These asymmetries are attributed to the so-called Collins fragmentation function, which depict the behavior of a hadron produced from a transversely polarized quark. This spin-dependent function is an important input for the global analysis of extracting the transversity inside the nucleon. In addition, by comparison with the measured asymmetries at Belle, this measurement provides the first data to explore the $Q^{2}$ $Q^{2}$ evolution of the spin-dependent fragmentation function. This work is performed based on about 62 ${pb}^{- 1}$ ${pb}^{- 1}$ data collected with the BESIII detector at BEPCII at $\sqrt{s}$ $\sqrt{s}$ =3.65GeV.

Keywords:

PACS: 13.66.Bc, 13.88.+e, 14.65.−q

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Published: 29 February 2016

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This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 3.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited.

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Measurement of Collins Asymmetries in Inclusive Production of Charged Pion Pairs at BESIII

Abstract

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