119306140
Tests of a Digital Hadron Calorimeter
In the context of developing a hadron calorimeter with extremely fine granularity for the application of Particle Flow Algorithms to the measurement of jet energies at a future lepton collider, we report on extensive tests of a small scale prototype calorimeter. The calorimeter contained up to 10 layers of Resistive Plate Chambers (RPCs) with 2560 1 \times 1 cm2 readout pads, interleaved with steel absorber plates. The tests included both long-term Cosmic Ray data taking and measurements in particle beams, where the response to broadband muons and to pions and positrons with energies in the range of 1 - 16 GeV was established. Detailed measurements of the chambers efficiency as function of beam intensity have also been performed using 120 GeV protons at varying intensity. The data are compared to simulations based on GEANT4 and to analytical calculations of the rate limitations.
124045765
Standard Model Physics at TeV2000
tev_2000 describes the collider physics program at the Fermilab Teva- tron for the next decade.
120352655
The ASTERIX spectrometer at LEAR
The ASTERIX spectrometer has been used to study the formation and the ground state of the pp atom and exclusive final states of pp annihilation at rest in a H2 gas target at NTP, using antiprotons from the Low Energy Antiproton Ring (LEAR) at CERN. The article describes the mechanical construction of the apparatus, the trigger logic, the chamber readout, and the data acquisition system. The detector calibration and the offline processing of the 55 million reconstructed events are illustrated. An overview is given about the new physics results obtained by the experiment.
117711934
OBSERVATION OF THE PI+ PI- DECAY OF THE RHO-PRIME (1600) IN GAMMA PROTON INTERACTIONS AT 19-GEV.
118570823
Status of Design, Development and Test of the Dipole Magnets for the High Energy Booster
Westinghouse Magnet Systems Division has a contract to design, develop, build and test the superconducting dipole magnets for the High Energy Booster. This paper covers the key requirements of the magnet and the design features to meet these requirements. Although similar to the Collider dipole magnets, there are some key differences in the functional requirements and design constraints which lead to design differences. Most significant is the requirement to prevent quench during bipolar operation at a ramp rate of 62 A/s compared to unipolar operation at 4 A/s for the Collider. Testing of 50 mm magnets made for the SSCL string test show that the design is sensitive to interstrand eddy currents and resultant heating at the higher ramp rate. The cryostat diameter is not constrained by the fixed distance between top and bottom rings as in the Collider. We are taking advantage of the additional space allowed. Emphasis in this paper is placed on the design differences and the reasons for them in both the cold mass and the cryostat. Our cold testing requirements and plans for test facilities to carry out the tests are summarized.
189425435
Search for top at D0
119973029
BTEV — A Dedicated B physics detector at the Fermilab Tevatron Collider
The capabilities of future Dedicated Hadron Collider B Physics experiments are discussed and compared to experiments that will run in the next few years. The design for such an experiment at the Tevatron Collider is presented and an evolutionary path for developing it is outlined. 9 refs., 3 figs., 4 tabs.
55388290
Prospects for heavy flavor physics at hadron colliders
The role of hadron colliders in the observation and study of CP violation in B decays is discussed. We show that hadron collider experiments can play a significant role in the early studies of these phenomena and will play an increasingly dominant role as the effort turns towards difficult to measure decays, especially those of the Bs meson, and sensitive searches for rare decays and subtle deviations from Standard Model predictions. We conclude with a discussion of the relative merits of hadron collider detectors with ‘forward’ vs ’central’ rapidity coverage.
112436340
CHEP95 CONFERENCE SUMMARY
118563698
Hadron and photon production of heavy quarks
Recent results on the production dynamics of bottom from the Collider Detector Facility, E653, and E672 at Fermilab are reviewed and compared to previous results and theory. Agreement with theory is reasonable but the possible origins of the differences that do exist may lie in higher order corrections or possibly the shape of the gluon distribution. New results on the A‐dependence of charm are summarized. Recent results are converging towards an α parameter of 1, independent of xF. Results on inclusive charm production from Fermilab E769 and E653 and CERN WA82 are reviewed. Recent results on D−D correlations in photoproduction from E687 at Fermilab are reported. Many new results on charmed baryon states from CLEO, E687, ARGUS, and Serpukhov BIS‐2 are reviewed. This is an area where rapid progress is now occurring. Results on the D* branching fractions, Ds branching fractions, doubly Cabibbo suppressed decays, and the ratio D°→KK/D°→ππ are covered.
116408887
The BTeV trigger and data acquisition system
The BTeV trigger inspects every beam crossing of the Fermilab Tevatron, running at a luminosity of 2 x 10{sup 32}/cm{sup 2}-s, and selects events that have ''detached vertices'' from B decays occurring downstream of the main interaction. The system uses a massively parallel system of FPGAs and microprocessors to produce a trigger decision on average every 396 ns. The trigger calculations are facilitated by the 23 Million channel pixel detector that provides the input to the trigger. Front end electronics sparsifies the remainder of event data and sends it to large, Tbyte, memory buffers that store it until the trigger decision can be made. This complex system presents special challenges in fault monitoring and power and cooling.