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MOMENTUM SPECTRA IN THE WINDOW P=0.1-6.0 HAVE BEEN FITTED BY THE FORMULA: (1/N)*D(N)/D(P)=CONST(Q=1)*EXP(-SLOPE(Q=1)*P)+CONST(Q=2)*EXP (-SLOPE(Q=2)*P).
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Light ion collisions with carbon target at 4.2 GeV/c/N are studied. Pion multiplicity distributions, momentum and angular spectra are analysed. These data are described in terms of models assuming independent interactions of nucleons from the projectile nucleus with the target.
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Identification of muons in hadronic events from e+e− annihilation observed in the MAC detector at the storage ring PEP provides flavor tagging of heavy primary quarks. A sample enriched in events from bb¯ production is obtained and the b-quark fragmentation function is inferred from the momentum spectrum of the muons. The b quark is found to fragment predominantly with high values of z, with 〈zb〉=0.8±0.1, and to have an over-all semimuonic branching fraction of (15.5−2.9+5.4)%.
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