Opportunities with Drell-Yan scattering: Probing sea quarks in the nucleon and nuclei
Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
* e-mail: email@example.com
Accepted: 15 October 2006
Published online: 22 February 2007
The large ¯(x)/¯(x) ratio observed by Fermilab E866/NuSea convincingly demonstrated that the sea is not simply a result of pQCD. Moreover, meson cloud models also failed to explain fully the observed kinematic dependence. The Drell-Yan mechanism offers a unique, selective probe of antiquarks in the nucleon. Fermilab has approved a new Drell-Yan experiment, E906, that will exploit this feature to probe ¯(x)/¯(x) by measuring the ratio of cross-sections for the proton-induced Drell-Yan process on hydrogen to deuterium. When the nucleon is contained in a nucleus, the nucleon's parton distributions should to be modified; although this effect was not seen in the sea quark distributions obtained by Fermilab E772 with Drell-Yan scattering. The upcoming E906 Drell-Yan experiment will provide much more precise measurements over a wider kinematic range in order to guide and challenge the theoretical models.
PACS: 14.20.Dh Protons and neutrons – / 14.65.Bt Light quarks –
© Società Italiana di Fisica and Springer-Verlag, 2007