We present a study of differential two jet ratios in multi-hadronic final states produced by
e
+
e
− annihilation in the AMY detector at TRISTAN. The data are compared to the predictions of the ...next-to-leading logarithm parton-shower (NLL PS) Monte Carlo and the
O(
α
s
2) matrix element QCD models. We determine the strong coupling strength
α
s
(57.3 GeV) = 0.130 ± 0.006.
Using 123 multihadronic inclusive muon-production {ital e}{sup +}{ital e}{sup {minus}} annihilation events at an average c.m. energy of 55.2 GeV, we extracted the forward-backward charge asymmetry of ...the {ital e}{sup +}{ital e}{sup {minus}}{r arrow}b{bar b} process and the {ital R} ratio for {ital b{bar b}} production. We used an analysis method in which the behavior of the {ital c} quark and lighter quarks is assumed, with only that of the {ital b} quark left indeterminate. The results, {ital A}{sub {ital b}}={minus}0.72{plus minus}0.28(stat){plus minus}0.13(syst) and {ital R}{sub {ital b}}=0.57{plus minus}0.16{plus minus}0.10, are consistent with the standard model.
The forward-backward asymmetry of quarks produced in {ital e}{sup +}{ital e}{sup {minus}} annihilations, summed over all flavors, is measured at {radical}{ital s} between 50 and 60.8 GeV. Methods of ...determining the charge direction of jet pairs are discussed. The asymmetry is found to agree with the five-flavor standard model.
Presented are the main design features and performance results of the cathode strip chambers (CSCs) for the CMS Endcap Muon System. The six-plane structure of these chambers yields a spatial ...resolution of about 80 /spl mu/m, essentially uniform and independent of the strip width (up to 16 mm, which is unusually wide for the cathode-to-anode wire distance of 5 mm). In addition, the net spatial resolution of about one-tenth of the strip width at the hardware trigger level (300ns) is obtained using a simple network of comparators. The time resolution achieved at the trigger level is /spl sim/4ns (RMS) that allows unambiguous tagging of bunch crossing occurring every 25 ns. Aging tests, including those obtained with a recirculating gas system, showed only minor aging effects. The aging studies were performed with large-scale chambers; 700 m of wire were irradiated for a dose up to 0.4 C/cm of the total accumulated charge.
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