Direct measurement of the pion valence quark momentum distribution, the pion light-cone wave function squared

Details Direct measurement of the pion valence quark momentum distribution, the pion light-cone wave function squared Direct measurement of the pion valence quark momentum distribution, the pion light-cone wave function squared

2000-10-17

arxiv.org/abs/hep-ex/0010043v1

Phys.Rev.Lett.86:4768-4772,2001

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.86.4768

We present the first direct measurements of the pion valence quark momentum distribution which is related to the square of the pion light-cone wave function. The measurements were carried out using data on diffractive dissociation of 500 GeV/c $\pi^-$ into di-jets from a platinum target at Fermilab experiment E791. The results show that the $|q\bar {q}>$ light-cone asymptotic wave function, which was developed using perturbative QCD methods, describes the data well for $Q^2 \sim 10 ~{\rm (GeV/c)^2}$ or more. We also measured the transverse momentum distribution of the diffractive di-jets.

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