119875628
Conference summary: 6th International conference on hyperons, charm, and beauty hadrons (BEACH04)
The 6th International Conference on Hyperons, Charm, and Beauty Hadrons (BEACH04) treated us to a wonderful array of new results. Here the author attempts to summarize the talks and discuss the conference highlights.
123546567
B physics, BTeV, and all that
The status of ''flavor physics'' in our pursuit of knowledge in elementary particle physics is discussed. Then, the BTeV experiment, planned for the Fermilab Tevatron collider, is described briefly and its physics reach is discussed. Comparisons are made to the current B physics experiments at e{sup +}e{sup -} facilities and to the LHCb experiment, planned for the Large Hadron Collider at CERN.
112436340
CHEP95 CONFERENCE SUMMARY
43779709
Measurement of the D0 and D+ lifetimes.
We have used a high-resolution drift chamber in the Mark II detector at the SLAC e/sup +/e/sup -/ storage ring PEP to measure the lifetimes of the D/sup 0/ and D/sup +/ mesons produced in e/sup +/e/sup -/ annihilations at 29 GeV. Based on a sample of 74 decays for the D/sup 0/ mesons and 23 decays for the D/sup +/ mesons, the lifetimes are found to be tau/sub D//sub =/ = (4.7/sub -0.8//sup +0.9/) +- 0.5 x 10/sup -13/ sec and tau/sub D//sub =/ = (8.9/sub -2.7//sup +3.8/) +- 1.3 x 10/sup -13/ sec. This leads to a ratio of lifetimes tau/sub D//sub =//tau/sub =/ = 1.9/sub -0.7/ /sup +0.9/ +- 0.3. .AE
118611463
Measurement of Positron Showers with a Digital Hadron Calorimeter
A small prototype of a finely granulated digital hadron calorimeter with Resistive Plate Chambers as active elements was exposed to positrons of 1?16 GeV energy from the Fermilab test beam. The response function, energy resolution, as well as measurements of the shape of electromagnetic showers are presented. The data are compared to a Monte Carlo simulation of the set-up.
27881414
Collider Physics at FNAL
After a three year hiatus, the Fer~ab Tevatron CoUder is back in operation defiverirrgfi coUsions at V = 1.8 TeV. The experimented situation is considerably Merent this run with an upgraded CDF detector jotied by the new DO detector. kprovements to the accelerator are expected to de~ver 100 pb1 from a run extending into 1993. Mer a description of the detectors and accelerator schedrde, recent physics restits horn the 1988-89 CDF m w~ be used to big~ght the rich physics menu at the Tevatron.
173983707
Detecting High Mass H 0 A 0 Pairs at a 1 TeV Linear Collider
This note describes results from a study ofH0A0 associated production at a linear e+e− collider with √ s = 1.0 TeV. For the values of tanβ as well as the H0 and A0 masses considered here, the dominant decay mode is bb pairs. This fully hadronic final state has limited backgrounds at an e+e− collider, but at the LHC or VLHC it suffers extremely high backgrounds from standard QCD jet production. At an e+e− collider, the dominant background is tt production with fully hadronic t–quark decay in which the c–quarks fromW± decay are misidentified as b’s. Other backgrounds such as four–fermion production are negligible because of the signal is dominated by a four b final state. The results of this study are quite encouraging. Good signal–to–background was observed using event rates alone, and reconstructed Higgs mass distributions showed high–efficiency, low background regions. This note has four sections. The first is a description of the Monte Carlo generation and simulation. The second describes the analysis, including mass reconstruction and jet–flavor identification. The third presents the results, and the fourth discusses additional work to be done.
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.
113428998
Progress in Understanding RAMP Rate Sensitivity in High Energy Booster Dipole Magnets
Quench current on some string test magnets decreased significantly with increased ramp rate. As subcontractor for the design and development of the HDMs, Westinghouse is responsible for ensuring that HDMs reach full field during the bipolar operating cycle which ramps at 62 A/s, compared with only 4 A/s for CDMs. Our objective is to specify and control design and processes to consistently produce magnets that meet ramp rate requirements. Understanding observed ramp sensitivity is necessary, along with aggressive testing of candidate design and process improvements.