Identified Hadron Production and Light Quark Fragmentation in Z 0 Decays ∗
نویسنده
چکیده
We have measured the differential cross sections for the production of π + , K + , K 0 , K * 0 , φ, p, Λ and their corresponding antiparticles in separate samples of flavor-tagged Z 0 → light-flavor (u¯ u, d ¯ d, or s¯ s), Z 0 → c¯ c and Z 0 → b ¯ b events. Clear flavor dependences are observed, and the results are compared with the predictions of three fragmentation models. We have also performed a direct measurement of A s , the parity-violating coupling of the Z 0 to strange quarks, by measuring the left-right-forward-backward production asymmetry in polar angle of the tagged s quark. Our preliminary result is A s = 0.82±0.10(stat.)±0.07(syst.).
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