Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in $p^\uparrow+p$ at $\sqrt{s}=200$ GeV - INSPIRE

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Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in $p^\uparrow+p$ at $\sqrt{s}=200$ GeV

STAR

Collaboration

Apr 1, 2015

11 pages

Published in:

Phys.Rev.Lett. 115 (2015) 242501

Published: Dec 8, 2015

e-Print:

1504.00415 [hep-ex]

DOI:

10.1103/PhysRevLett.115.242501

Experiments:

BNL-RHIC-STAR

View in:

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Abstract: (arXiv)

We report the observation of transverse polarization-dependent azimuthal correlations in charged pion pair production with the STAR experiment in

p^\uparrow+p

collisions at RHIC. These correlations directly probe quark transversity distributions. We measure signals in excess of five 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. Comparing the results to data from lepton-nucleon scattering will test the universality of these spin-dependent quantities.

Note:

11 pages, 5 figures, 15 tables. Submitted to PRL

p p: scattering
transverse momentum: high
pi: pair production
rho(770)
rapidity: high
spin: dependence
angular correlation: two-pion
transversity
polarized beam: transverse
Brookhaven RHIC Coll

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