FNAL E906: Extended Measurement of the Anti-quark Asymmetry in the Nucleon Sea

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Recently Fermilab has approved experiment 906 which will extend the measurement of the anti-quark asymmetry in the nucleon sea to larger values of the fractional momentum (x). This measurement using proton induced Drell-Yan reactions at 120 GeV will extend beyond the measurement made by FNAL E866/NuSea. E866 unexpectedly showed that the ratio of the anti-down to anti-up quark distributions varied considerably with x. A lower energy primary proton beam from the Fermilab Main Injector makes it possible to extend the E866 measurements to larger x with much higher precision. This experiment will also measure parton energy loss and modifications to the anti-quark distributions in nuclear targets at large x (x>0.2).

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