Speaker
Mingzhe Xie
(University of Science and Technology of China (CN))
Description
We measure proton structure parameters sensitive primarily to valence quarks using $8.6~{\rm fb}^{−1}$ of data collected by the D0 detector in $\sqrt{s} = 1.96~{\rm TeV}$ ${\rm p\bar{p}}$ collisions at the Fermilab Tevatron. We exploit the property of the forward-backward asymmetry in dilepton events to be factorized into distinct structure parameters and electroweak quark-level asymmetries. Contributions to the asymmetry from s, c and b quarks, as well as from u and d sea quarks, are suppressed allowing valence u and d quarks to be separately determined. We find a u to d quark ratio near the peak values in the quark density distributions that is smaller than predictions from modern parton distribution functions.
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