Naslov
Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarized p+p collisions at √s=200   GeV

Autori
Adamczyk, L. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zoulkarneeva, Y.

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 86 (2012); 032006-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
spin; asymmetry; jet; STAR

Sažetak
We report STAR measurements of the longitudinal double-spin asymmetry ALL, the transverse single-spin asymmetry AN, and the transverse double-spin asymmetries AΣ and ATT for inclusive jet production at mid-rapidity in polarized p+p collisions at a center- of-mass energy of √s=200  GeV. The data represent integrated luminosities of 7.6  pb-1 with longitudinal polarization and 1.8  pb- 1 with transverse polarization, with 50%–55% beam polarization, and were recorded in 2005 and 2006. No evidence is found for the existence of statistically significant jet AN, AΣ, or ATT at mid- rapidity. Recent model calculations indicate the AN results may provide new limits on the gluon Sivers distribution in the proton. The asymmetry ALL significantly improves the knowledge of gluon polarization in the nucleon.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
STAR Collaboration.

POVEZANOST RADA