Proposal for Drell-Yan Measurements of Nucleon and Nuclear Structure with the FNAL Main Injector

Isenhower, L. D. ; Sadler, M. E. ; Arrinton, J. ; Geesamn, D. F. ; Holt, R. J. ; Jackson, H. E. ; Reimer, P. E. ; Potterveld, D. H. ; Brown, C. N. ; Garvey, G. T. ; Leitch, M. J.

Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

关键词: Modifications;    Protons;    Targets Accelerators;    43 Particle Accelerators;    Quarks;   

DOI  :  10.2172/993214
RP-ID  :  FERMILAB-PROPOSAL--0906
RP-ID  :  AC02-07CH11359
RP-ID  :  993214

美国|英语

来源: UNT Digital Library

【 摘 要 】

We propose measuring the fractional momentum $(x)$ dependence of the ratio of the anti-down to anti-up quark distributions in the proton, $\bar{d}(x)/\bar{u}(x)$, using proton induced Drell-Yan reactions at 120 GeV. Recent measurements by FNAL E866 unexpectedly show considerable $x$ dependence in this ratio for $x$ > 0.2. A lower energy primary proton beam from the Main Injector makes it possible to extend the E866 measurements to larger x with much higher precision. The apparatus will also be used with nuclear targets to measure parton energy loss and modifications to anti-quark distributions in nuclear targets at large $x$ ($x$ > 0.2).