We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at s=500  GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.

Measurement of the Transverse Single-Spin Asymmetry in p ↑+p →w± /Z0 at RHIC / Adamczyk, L., Adkins, J.K., Agakishiev, G., Aggarwal, M.M., Ahammed, Z., Alekseev, I., Aparin, A., Arkhipkin, D., Aschenauer, E.C., Attri, A., Averichev, G.S., Bai, X., Bairathi, V., Banerjee, A., Bellwied, R., Bhasin, A., Bhati, A.K., Bhattarai, P., Bielcik, J., Bielcikova, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 116:13(2016), pp. 132301.1-132301.7. [10.1103/PhysRevLett.116.132301]

Measurement of the Transverse Single-Spin Asymmetry in p ↑+p →w± /Z0 at RHIC

Contin, G.;Di Ruzza, B.;
2016-01-01

Abstract

We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at s=500  GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2941994
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