Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1995-01-18
Phys.Rev.Lett.74:850-854,1995
Physics
High Energy Physics
High Energy Physics - Experiment
to be published in PRL
Scientific paper
10.1103/PhysRevLett.74.850
The charge asymmetry has been measured using $19,039~W$ decays recorded by the CDF detector during the 1992-93 run of the Tevatron Collider. The asymmetry is sensitive to the ratio of $d$ and $u$ quark distributions to $x<0.01$ at $Q^2 \approx M_W^2$, where nonperturbative effects are minimal. It is found that of the two current sets of parton distributions, those of Martin, Roberts and Stirling (MRS) are favored over the sets most recently produced by the CTEQ collaboration. The $W$ asymmetry data provide a stronger constraints on $d/u$ ratio than the recent measurements of $F_2^{\mu n}/F_2^{\mu p}$ which are limited by uncertainties originating from deutron corrections.
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