Opportunities with Drell-Yan scattering: Probing sea quarks in the nucleon and nuclei |
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Authors: | P E Reimer |
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Institution: | (1) Physics Division, Argonne National Laboratory, 60439 Argonne, IL, USA |
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Abstract: | The large ˉ(x)/ˉ(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 ˉ(x)/ˉ(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. |
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Keywords: | 14 20 Dh Protons and neutrons 14 65 Bt Light quarks |
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