207 articles – 1932 Notices  [english version]
 HAL : in2p3-00703157, version 1
 arXiv : 1205.6826
 Physical Review D 86 (2012) 051101
 Transverse Single-Spin Asymmetry and Cross-Section for pi0 and eta Mesons at Large Feynman-x in Polarized p+p Collisions at sqrt(s)=200 GeV
 STAR Collaboration(s)
 (2012)
 Measurements of the differential cross-section and the transverse single-spin asymmetry, A_N, vs. x_F for pi0 and eta mesons are reported for 0.4 < x_F < 0.75 at an average pseudorapidity of 3.68. A data sample of approximately 6.3 pb^{-1} was analyzed, which was recorded during p+p collisions at sqrt{s} = 200 GeV by the STAR experiment at RHIC. The average transverse beam polarization was 56%. The cross-section for pi0 is consistent with a perturbative QCD prediction, and the eta/pi0 cross-section ratio agrees with previous mid-rapidity measurements. For 0.55 < x_F < 0.75, A_N for eta (0.210 +- 0.056) is 2.2 standard deviations larger than A_N for pi0 (0.081 +- 0.016).
 Thème(s) : Physique/Physique des Hautes Energies - ExpériencePhysique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1205.6826
 in2p3-00703157, version 1 http://hal.in2p3.fr/in2p3-00703157 oai:hal.in2p3.fr:in2p3-00703157 Contributeur : Sylvie Florès <> Soumis le : Vendredi 1 Juin 2012, 07:17:10 Dernière modification le : Lundi 26 Novembre 2012, 14:09:34