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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, Batavia, IL (United States). Funding organisation: US Department of Energy (United States)2001
Fermi National Accelerator Laboratory, Batavia, IL (United States). Funding organisation: US Department of Energy (United States)2001
AbstractAbstract
[en] 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).
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1 Apr 2001; 36 p; AC02-76CH03000; Available from http://lss.fnal.gov/cgi-bin/find_paper.pl?proposal-0906.pdf; PURL: https://www.osti.gov/servlets/purl/993214-p2SOgG/; doi 10.2172/993214
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