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An asynchronous version of a binary pixel readabout circuit has been implemented in an array with 16 columns at 500 mu m pitch and 63 rows at 75 mu m pitch. This readabout chip has been bonded with solder bumps to a silicon detector with matching pixel elements. Event information in a pixel can be strobed into a local memory by a trigger signal and(More)
CERN experiment WA89 has studied charmed particles produced by a Σ − beam at 340GeV/c on nuclear targets. Production of particles which have light quarks in common with the beam is compared to production of those which do not. Considerable production asymmetries between D − and D + , D − s and D + s and Λ c and Λ c are observed. The results are compared(More)
The readout electronics of a silicon microstrip vertex detector aimed at finding secondary vertices for beauty identification is described. High density and high speed have been achieved, allowing the detector to take part in the trigger. Despite the large number of channels and thanks to the use of application-specific integrated circuits (ASICs), the(More)
the date of receipt and acceptance should be inserted later a supported by the Deutsche Forschungsgemeinschaft, contract number436 RUS 113/465, and Russian Foundation for Basic Research under contract number RFFI 98-02-04096. Abstract. The production of charmed particles by Σ − of 340 GeV/c momentum was studied in the hyperon beam experiment WA89 at the(More)
We study the distributions of the number of visits for some noteworthy dynamical systems, considering whether limit laws exist by taking domains that shrink around points of the phase space. It is well known that for highly mixing systems such limit distributions exhibit a Poissonian behavior. We analyze instead a skew integrable map defined on a cylinder(More)
A study of kinematical correlations between charmed particles produced in {Cu interactions at p s = 26 GeV Abstract A sample of 475 events, in which two charmed-particle decays are observed, is analyzed to determine distributions of two-particle kinematic variables. One charmed particle with x F > 0 is fully reconstructed and the other is at least partially(More)
We report on the observation of a KSp resonance signal at a mass of 1765±5 MeV/c 2 , with intrinsic width Γ = 108 ± 22 MeV/c 2 , produced inclusively in Σ −-nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region xF > 0.7, in this region its production cross section rises approximately(More)
A geometrical approach of the finite-element analysis applied to electrostatic fields is presented. This approach is particularly well adapted to teaching Finite Elements in Electrical Engineering courses at undergraduate level. The procedure leads to the same system of algebraic equations as that derived by classical approaches, such as variational(More)
CERN experiment WA89 has studied charmed particles produced by a ? beam at 340GeV=c on nuclear targets. Production of particles which have light quarks in common with the beam is compared to production of those which do not. Considerable production asymmetries between D ? and D + , D ? s and D + s and c and c are observed. The results are compared with pion(More)