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Comment: Index Terms: Accelerator measurement systems, CVD, Diamond, Radiation detectors
Two-photon production of the hadronic final states K+Kπ+π and K+Kπ+π0π has been studied using the ARGUS detector at the e+e storage ring DORIS II at DESY. The cross sections of the reactions γγ → φρ0 and γγ → φρ have been measured for the first time. In addition, angular distrubutions have been determined for the reaction γγ → φρ0 → K+Kπ+π.
Using the ARGUS detector at the e+e storage ring DORIS II at DESY, we have studied the decay B0 → D*+- v by exploiting a partial D∗+ reconstruction technique. The branching ratio for this mode was thereby determined to be (4.5 ± 0.3 ± 0.4)%. Using the corresponding sample of tagged B0mesons, we measured the B0 and B0 mixing parameter to be rd = 0.194 ± 0.062 ± 0.054, a result only weakly dependent upon the ratio of semileptonic widths for and production rates of B0 and B+ mesons. We have also determined the branching ratio Br (
Using the ARGUS detector at the e+e storage ring DORIS II at DESY, we have obtained the first evidence for B meson decays into χc mesons. The inclusive branching ratio for the decay B → χc X was measured to the (1.05±0.35±0.25)% assuming no χc2 production. In addition, four candidates for the exclusive decay B±χc1K± have been observed, corresponding to a branching ratio of (0.19 ± 0.13 ± 0.06)%.
Using the detector ARGUS at the storage ring DORIS II of DESY, we have found evidence for the production of the charmed and doubly strange baryon Ωc through its decay channel ΞKπ+π+. Its mass has been determined to be ((2719.0±7.0±2.5)MeV/c2, and the product of production cross section and branching ratio the above channel to be (2.41±0.90±0.30) pb.
A spin-parity analysis of the ϱ+ϱ system in the reaction γγ→ϱ+ϱ→Π+ΠΠ0Π0 has been performed using the ARGUS detector at the e+e− storage ring DORIS II at DESY. The cross section is found to be dominated by the amplitudes JP = 0+ and JP = 2+ (Jz = 2).
An analysis of the decay τ− → π−π−π+π0ντ has been performed with the ARGUS detector at the DORIS II storage ring. From a study of the two pion subsystems we have found first evidence for the decays τ− → ϱ0π−π0ντ, τ− → ϱ−π+π−ντ, and τ− → ϱ+π−π−ντ with relative contributions to the decay τ− → π−π−π+π0ντ of 0.30 ± 0.04, 0.26 ± 0.05, and 0.10 ± 0.03, respectively. The fraction of the subchannel τ− → ωπ−ντ has been determined to be 0.33 ± 0.05. The production of ϱ mesons is enhanced by a factor of 1.9 ± 0.3 over that of ω mesons. We conclude that in more than 81% (95% CL) of all τ− → π−π−π+π0ντ decays either a ϱ or ω meson is produced.
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