The non universality of the quark Sivers function is a fundamental prediction from the gauge invariance of QCD. The experimental test of theSivers function sign change between semi-inclusicve DIS and Drell-Yan processes is one of the open questions in hadronic physics, and can provide a direct verification of TMD factorization. While a precise measurement of asymmetries in Drell-Yan production is challenging, W±/Z0W^{pm}/Z^{0}W±/Z0 production is equally sensitive to the predicted sign change. We present the preliminary measurement of the transverse single spin asymmetry of weak bosons by the STAR experiment at RHIC using transversely polarized proton-proton collisions at s=500sqrt{s}=500s =500 GeV.
Transverse single-spin asymmetries in $W^{pm}$ and $Z^{0}$ bosons production in p$+$p collisions at RHIC
Fazio Salvatore
2014-01-01
Abstract
The non universality of the quark Sivers function is a fundamental prediction from the gauge invariance of QCD. The experimental test of theSivers function sign change between semi-inclusicve DIS and Drell-Yan processes is one of the open questions in hadronic physics, and can provide a direct verification of TMD factorization. While a precise measurement of asymmetries in Drell-Yan production is challenging, W±/Z0W^{pm}/Z^{0}W±/Z0 production is equally sensitive to the predicted sign change. We present the preliminary measurement of the transverse single spin asymmetry of weak bosons by the STAR experiment at RHIC using transversely polarized proton-proton collisions at s=500sqrt{s}=500s =500 GeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
