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[en] In this session the experience gained during operation of large systems was reviewed
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; 
; CODEN NIMAER; v. 515(1-2); p. 70-72
; CODEN NIMAER; v. 515(1-2); p. 70-72
[en] A large data set of proton-nucleus collisions at √s = 41.6 GeV has been searched for Θ+ and Ξ(1862) pentaquark candidates. In 2 x 108 inelastic events we find no evidence for narrow signals (σ ≅ 5 MeV/c2 ) in the Θ+ → pK0s and Ξ(1862) → Ξπ channels. Upper limits on production cross sections at mid-rapidity and on ratios of production cross sections to those of well established resonances are presented.(author)
Journal
Acta Physica Polonica. Series B; ISSN 0587-4254; ; v. B35(7); p. 2223-2231
; v. B35(7); p. 2223-2231
[en] HERA-B is a B physics experiment using an internal target in the HERA proton ring. The main goal of this experiment is the detection of CP-violation in the B system by studying the decay B0 → J/ψKS0. The principle of the measurement and the expected CP reach of HERA-B are discussed. The internal target and the results of test measurements demonstrating the feasibility of the target are described in some detail. The basic design of the HERA-B detector is presented. (author). 3 refs., 4 figs., 1 tab
Source
Tran Thanh Van, J. (ed.); [649 p.]; ISBN 2-86332-162-5; ; 1994; p. 501-506; Editions Frontieres; Paris (France); 29. Moriond particle physics meeting - Leptonic session; Meribel les Allues, Savoie (France); 12-19 Mar 1994
; 1994; p. 501-506; Editions Frontieres; Paris (France); 29. Moriond particle physics meeting - Leptonic session; Meribel les Allues, Savoie (France); 12-19 Mar 1994
[en] B0-anti B0 mixing has been observed for the first time. Using the ARGUS detector at the DORIS II storage ring we have studied the decay of the Υ(4S) meson into a pair of B mesons. We found one explicitly mixed event, a decay Υ(4S)→B0B0, which has been completely reconstructed. Furthermore, we observe a 4 standard deviation signal of 24.8 events with like-sign lepton pairs and a 3 standard deviation signal of 4.1 events containing one reconstructed B0(anti B0) and an additional fast l±. This shows that B0-anti B0 oscillations are substantial with a mixing parameter r of r=0.21±0.08. (orig.)
Journal
[en] HERA-B is an experiment designed primarily to study CP violation in decays of B mesons into the ''gold plated'' decay mode B0 →J/ψ K0S. The B mesons are produced in interactions of 820 GeV protons in the HERA proton beam with an internal wire target in the beam halo. Besides a short overview, the conception of the internal target and the results of the target tests are addressed. The detector requirements as well as the main detector components are described, whereas the physics goals of the experiment and some details of the detector are described elsewhere in this issue. (orig.)
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 384(1); p. 106-112
; CODEN NIMAER; v. 384(1); p. 106-112
[en] Recent results on hadronic D0 decays and P-wave charmed mesons are discussed. The data have been collected with the ARGUS detector at the e+e- storage ring DORIS II at centre-of-mass energies around 10 GeV. This presentation includes the observation of several new hadronic D0 decays, the first measurement of an isospin mass splitting in the P-wave D meson sector, a decay angular analysis attempting to decompose the D*(2420)0, and the observation of a candidate for an L=1 Ds meson. (orig.)
Journal
[en] The results reported here are based on a data sample of 103 pb-1 obtained on the Υ(4S) resonance using the ARGUS detector at the e+e- storage ring DORIS II at DESY. A sample of 49 pb-1, obtained at centre-of-mass energies below the Υ(4S), has been used for continuum studies. (orig./HSI)
Source
Kotthaus, R.; Kuehn, J.H. (Max-Planck-Institut fuer Physik und Astrophysik, Muenchen (Germany, F.R.). Werner-Heisenberg-Inst. fuer Physik) (eds.); 1635 p; ISBN 3-540-50361-7; ; 1989; p. 505-510; Springer; Berlin (Germany, F.R.); 24. international conference on high energy physics (Rochester conference); Muenchen (Germany, F.R.); 4-10 Aug 1988
; 1989; p. 505-510; Springer; Berlin (Germany, F.R.); 24. international conference on high energy physics (Rochester conference); Muenchen (Germany, F.R.); 4-10 Aug 1988
[en] Using the ARGUS detector at the e+e- storage ring DORIS II at DESY, the decay τ- → ντ π-π+π-π0 has been analyzed. Clear evidence has been found for the decay τ- → ντ ω π-. The ω π- system has been shown to be predominantly in a JP = 1- state. Contributions from second-class axial-vector events (JP = 1+) are below 50% at 90% CL. The decay τ-→ ντη π- can proceed only via second-class vector currents. For its decay mode we obtain an upper limit of 1.3% at 95% confidence level
Source
Tran Thanh Van, J. (ed.); 800 p; ISBN 2-86332-047-5; ; 1987; p. 543-548; Editions Frontieres; Gif-sur-Yvette (France); Moriond Meeting on progress in electroweak interactions; Les Arcs (France); 08-15 Mar 1987
; 1987; p. 543-548; Editions Frontieres; Gif-sur-Yvette (France); Moriond Meeting on progress in electroweak interactions; Les Arcs (France); 08-15 Mar 1987
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