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Measurement of Azimuthal Asymmetries in Inclusive Charged Dipion Production in e(+) e(-) Annihilations at root s=3.65 GeV
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Inst High Energy Phys, Beijing 100049, Peoples R China..
Carnegie Mellon Univ, Pittsburgh, PA 15213 USA..
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2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 4, 042001Article in journal (Refereed) PublishedText
Abstract [en]

We present a measurement of the azimuthal asymmetries of two charged pions in the inclusive process e(+) e(-) -> pi pi X based on a data set of 62 pb(-1) at the center-of-mass energy of 3.65 GeV collected with the SESIII detector. These asymmetries can be attributed to the Collins fragmentation function. We observe a nonzero asymmetry, which increases with increasing pion momentum. As our energy scale is close to that of the existing semi-inclusive deep inelastic scattering experimental data, the measured asymmetries are important inputs for the global analysis of extracting the quark transversity distribution inside the nucleon and are valuable to explore the energy evolution of the spin-dependent fragmentation function.

Place, publisher, year, edition, pages
2016. Vol. 116, no 4, 042001
National Category
Accelerator Physics and Instrumentation
URN: urn:nbn:se:uu:diva-279592DOI: 10.1103/PhysRevLett.116.042001ISI: 000369337800001OAI: oai:DiVA.org:uu-279592DiVA: diva2:908370
Swedish Research Council
Available from: 2016-03-02 Created: 2016-03-02 Last updated: 2016-05-10Bibliographically approved

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Johansson, TordKupsc, AndrzejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus
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