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

### Description

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).

36 p.

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### Description

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).

36 p.

### Identifier

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• Report No.: FERMILAB-PROPOSAL--0906
• Grant Number: AC02-07CH11359
• DOI: 10.2172/993214 | External Link
• Office of Scientific & Technical Information Report Number: 993214

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#### Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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### Creation Date

• April 1, 2001

### Added to The UNT Digital Library

• Oct. 14, 2017, 8:36 a.m.

### Description Last Updated

• Oct. 24, 2017, 3:17 p.m.

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