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

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.
2016
Pubblicato
http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.116.132301/apsxml
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.116.132301_measurement_spin.pdf

Accesso chiuso

Tipologia: Documento in Versione Editoriale
Licenza: Copyright Editore
Dimensione 343.89 kB
Formato Adobe PDF
343.89 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2941994
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 91
  • ???jsp.display-item.citation.isi??? 64
social impact