Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p+p at s=200GeV

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. Lett. 115, 242501 – Published 8 December 2015
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Abstract

We report the observation of transverse polarization-dependent azimuthal correlations in charged pion pair production with the STAR experiment in p+p collisions at RHIC. These correlations directly probe quark transversity distributions. We measure signals in excess of 5 standard deviations at high transverse momenta, at high pseudorapidities η>0.5, and for pair masses around the mass of the ρ meson. This is the first direct transversity measurement in p+p collisions.

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  • Received 2 April 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.242501

© 2015 American Physical Society

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Vol. 115, Iss. 24 — 11 December 2015

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