Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in p
Phys Rev Lett
; 115(24): 242501, 2015 Dec 11.
Article
in En
| MEDLINE
| ID: mdl-26705627
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2015
Type:
Article
Affiliation country:
Poland