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

0454098 - ÚJF 2016 RIV US eng J - Journal Article
Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Tlustý, David - Trzeciak, B. A. - Vértési, Robert … Total 332 authors
Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p(up arrow) + p at root s=200 GeV.
Physical Review Letters. Roč. 115, č. 24 (2015), s. 242501. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA13-20841S
Institutional support: RVO:61389005
Keywords : STAR collaboration * heavy ion collisions * transverse momenta
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 7.645, year: 2015

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.
Permanent Link: http://hdl.handle.net/11104/0254795