Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-05-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, LATEX2e with lprocl.sty and floatfig.sty, 1 eps figure. Talk given at the XIV International Conference on Particles a
Scientific paper
In order to test the NMC finding of flavor asymmetry $\overline u-\overline d$ in the nucleon, existing Drell-Yan data for the tungsten target are often used. However, we have to be careful in comparing nuclear data with the nucleon ones. We investigate whether there exists significant nuclear modification of the $\overline u - \overline d$ distribution in a parton-recombination model. It should be noted that a finite $\overline u - \overline d$ distribution is theoretically possible in nuclei even if the sea is symmetric in the nucleon. In neutron-excess nuclei such as the tungsten, there exist more $d$-valence quarks than $u$-valence quarks, so that more $\overline d$-quarks are lost than $\overline u$-quarks due to parton recombinations. Our results suggest that the nuclear modification in the tungsten is a 2--10 \% effect on the NMC $\overline u - \overline d$ distribution. The nuclear modification of the flavor asymmetry should be an interesting topic in connection with ongoing Drell-Yan experiments.
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