Quark structure functions have been extracted from low-£ r inclusive hadron production data for the pion and kaon with use of the recombination model. « 1T =1.0± 0.1 and « ir = 2.5 ±0.6 is obtained, where n is the leading (1-x) power of the nonstrange-valence-quark distribution. Both the pion and kaon nonstrange-sea-quark functions have n -3.5.
We present high-statistics results on the reactions a-^p-^c+X where a and c can be any of TT* , K^ ^ p ^ orp. The data were taken at 100 and 175 GeV/c incident momenta using the Fermilab Single-Arm Spectrometer operated over the kinematic range 0.2 <^ < 1.0 andpt^ 1.0 GeV/c. Investigating the x dependence of the data, we find agreement with a quark-parton picture, namely the cross sections have a power-law behavior in 1 -X independent of ^ beam and p t.We have performed a high-energy inclusive scattering experiment to study the process a + p -^c +X, where a and c can be any of TT* , /^*, p, or p. The production of particle c was measured over the Feynman x range 0.2 ^x^ 1.0, and the transverse momentum range 0.3 ^Pt^ 1.0 GeV/c. Data were taken using the Fermilab M6E beam line and the Single-Arm Spectrometer (SAS) facility with incident beam momenta of 100 and 175 GeV/c. This is the first high-energy, high-resolution study of beam fragmentation for incident particles other than protons with good Cherenkov identification.It has recently been suggested that the basic hadron constituents may reveal themselves in low'ptf soft hadronic processes as well as in leptoproduction and large-/>^ scatterings^ Several models have elaborated upon this idea, yielding
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