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Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p(up arrow) + p at root s=200 GeV
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Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p(up arrow) + p at root s=200 GeV

L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, A. Aparin, D. Arkhipkin, E. C. Aschenauer, …
Physical review letters, Vol.115(24)
08/12/2015
PMID: 26705627

Abstract

Physical Sciences Physics Physics, Multidisciplinary Science & Technology
We report the observation of transverse polarization-dependent azimuthal correlations in charged pion pair production with the STAR experiment in p(up arrow) + 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 eta > 0.5, and for pair masses around the mass of the rho meson. This is the first direct transversity measurement in p + p collisions.
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https://doi.org/10.1103/PhysRevLett.115.242501View
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