51815761
Status of the silicon strip vertex detector for the Mark II experiment at the SLC
A silicon-strip vertex detector is being constructed for use in the Mark II detector in the study of Z/sup 0/ decays at the SLAC Linear Collider. The status of the project, including the performance of the individual silicon detector modules, is presented. The discussion covers beam tests, vertex resolution, detector modules, module performance, and mechanical support and alignment. >
122598679
Measurement of the polarization parameter in K$sup +$p elastic scattering
Full angular distributions of the polarization parameter in elastic ${K}^{+}p$ scattering at 1.37, 1.45, 1.60, 1.71, 1.80, 1.89, 2.11, and 2.31 GeV/c are presented. These data were obtained in an experiment at the Zero Gradient Synchrotron using a polarized proton target with arrays of scintillation and \ifmmode \check{C}\else \v{C}\fi{}erenkov counters to detect the scattered particles.
120716454
Evidence of muonium formation using thin gold foils in vacuum
122557716
Measurement of the polarization parameter in K+p elastic scattering at 1.60, 1.80, 2.11 and 2.31 GeV/c
Abstract The polarization parameter for K+p elastic scattering has been measured at 1.60, 1.80, 2.11 and 3.31 GeV/c incident momenta over the entire angular range with an emphasis on the backward region. The results in the extreme backward region appear to be small and consistent with zero.
209999698
Inclusive gamma-Ray Spectra from psi (3095) and psi-prime (3684)
115886483
NEW PARTICLE SIGNALS AT THE SSC AND AT AN UPGRADED TEVATRON COLLIDER
56010430
Use of an FPGA to identify electromagnetic clusters and isolated hadrons in the ATLAS level-1 calorimeter trigger
Abstract At the full LHC design luminosity of 10 34 cm −2 s −1 , there will be approximately 10 9 proton–proton interactions per second. The ATLAS level-1 trigger is required to have an acceptance factor of ∼10 −3 . The calorimeter trigger covers the region | η |⩽5.0, and φ =0 to 2 π . The distribution of transverse energy over the trigger phase space is analysed to identify candidates for electrons/photons, isolated hadrons, QCD jets and non-interacting particles. The Cluster Processor of the level-1 calorimeter trigger is designed to identify transverse energy clusters associated with the first two of these. The algorithms based on the trigger tower energies which have been designed to identify such clusters, are described here. The algorithms are evaluated using an FPGA. The reasons for the choice of the actual FPGA being used are given. The performance of the FPGA has been fully simulated, and the expected latency has been shown to be within the limits of the time allocated to the cluster trigger. These results, together with the results of measurements made with real data into a fully configured FPGA, are presented and discussed.
120295900
The ATLAS Level-1 Calorimeter Trigger
The ATLAS Level-1 Calorimeter Trigger uses reduced-granularity information from all the ATLAS calorimeters to search for high transverse-energy electrons, photons, τ leptons and jets, as well as high missing and total transverse energy. The calorimeter trigger electronics has a fixed latency of about 1 μs, using programmable custom-built digital electronics. This paper describes the Calorimeter Trigger hardware, as installed in the ATLAS electronics cavern.
61559492
The Final Multi-Chip Module of the ATLAS Level-1 Calorimeter Trigger Pre-processor
The final Pre-Precessor Multi-Chip Module (PPrMCM) of the ATLAS Level-1 Calorimeter Trigger is presented. It consists of a four-layer substrate with plasma-etched vias carrying nine dies from different manufacturers. The task of the system is to receive and digitize analog input signals from individual trigger towers, to perform complex digital signal processing in terms of time and amplitude and to produce two independent output data streams. A real-time stream feeds the subsequent trigger processors for recognizing trigger objects, and the other provides deadtime-free readout of the Pre-Processor information for the events accepted by the entire ATLAS trigger system. The PPrMCM development has recently been finalized after including substantial experience gained with a demonstrator MCM.
56463206
Tracking with heavily irradiated silicon detectors operated at cryogenic temperatures
In this work we show that a heavily irradiated double-sided silicon microstrip detector recovers its performance when operated at cryogenic temperatures. A DELPHI microstrip detector, irradiated to a fluence of /spl sim/4/spl times/10/sup 14/ p/cm/sup 2/, no longer operational at room temperature, cannot be distinguished from a non-irradiated one when operated at T<120 K. Besides confirming the previously observed 'Lazarus effect' in single diodes, these results establish, for the first time, the possibility of using standard silicon detectors for tracking applications in extremely demanding radiation environments.
59149695
One size fits all: Multiple uses of common modules in the ATLAS level-1 calorimeter trigger
The architecture of the ATLAS Level-1 Calorimeter Trigger has been improved and simplified by using a common module to perform different functions that originally required three separate modules. The key is the use of FPGAs with multiple configurations, and the adoption by different subsystems of a common high-density custom crate backplane that takes care to make data paths equal widths and includes minimal VMEbus. One module design can now be configured to count electron/photon and tau/hadron clusters, or count jets, or form missing and total transverse-energy sums and compare them to thresholds. In addition, operations are carried out at both crate and system levels by the same module design.