[en] Simulated calorimeter performance in the SiD detector is examined. The software calibration procedures are described, as well as the perfect pattern recognition PFA reconstruction. Performance of the SiD calorimeters is summarized with jet energy resolutions from calorimetry only, perfect pattern recognition and the SiD PFA algorithm. Presented at LCWS08(1). Our objective is to simulate the calorimeter performance of the SiD detector, with and without a Particle Flow Algorithm (PFA). Full Geant4 simulations using SLIC(2) and the SiD simplified detector geometry (SiD02) are used. In this geometry, the calorimeters are represented as layered cylinders. The EM calorimeter is Si/W, with 20 layers of 2.5mm W and 10 layers of 5mm W, segmented in 3.5 x 3.5mm² cells. The HAD calorimeter is RPC/Fe, with 40 layers of 20mm Fe and a digital readout, segmented in 10 x 10mm² cells. The barrel detectors are layered in radius, while the endcap detectors are layered in z(along the beam axis)

[en] We present a status update of a full simulation package using GISMO. This package is a functioning tool producing simulation data for the two standard LCD detector designs, in a framework allowing easy changes to the detector designs. The simulation engine, GISMO, is separated from the application code, GISMOAPPS, to allow for a future upgrade to GEANT4 within the same framework

[en] At a future e+e- linear collider, precision measurements of jets will be required in order to understand physics at and beyond the electroweak scale. Calorimetry will be used with other detectors in an optimal way to reconstruct particle 4-vectors with unprecedented precision. This Particle Flow Algorithm (PFA) approach is seen as the best way to achieve particle mass resolutions from dijet measurements in the range of ∼ 30%/√E, resulting in innovative methods for choosing the calorimeter technology and optimizing the detector design

[en] A clear, prompt dimuon signal has been observed in a low-statistics streamer-chamber experiment with 16-GeV/c πp interactions. The good mass resolution makes it possible to identify the contributions from rho and ω decays and eta and ω Dalitz decays. An excess of events is observed in the mass region approx.400-600 MeV which is not accounted for by the above-mentioned decays

[en] We report the results of an experiment which examines the entire final state of events in which muon pairs were produced in 15.5-GeV/c π^+-p interactions. A portion of this data was presented earlier. Here we report on the final data sample of 890 events obtained from a total of 2.5 x 10⁸ interactions [a sensitivity of (8.65 events/nb) x trigger efficiency]. The experiment was sensitive primarily to the low-mass region and the good mass resolution made it possible to identify the contributions from the rho and ω decays and the eta and ω Dalitz decays. An excess of events is observed in the dimuon mass region approx.400 -- 600 MeV which is not accounted for by the above-mentioned decays. The final states were examined to search for characteristic differences from those in events without dimuons

[en] The barrel shower counter used in the Mark III detector at SPEAR is described. This unimodular cylindrical detector is placed inside the Mark III solenoidal magnet coil. The design, construction details and electronics are discussed. Its performance is studied using high statistics data from psi(3095) decays. The main features are 76% of 4π sr solid angle coverage, good detection efficiency for photons down to 100 MeV, fine segmentation to obtain 7 mrad angular resolution in the azimuthal angle phi, position resolution of 0.8%x wire length in the axial direction using charge division and overall energy resolution of 17.5%/√E. (orig.)

[en] A search for B_s⁰-B_s⁰ oscillations is performed using a sample of 400 000 hadronic Z⁰ decays collected by the SLAC Large Detector experiment. The B_s⁰ candidates are reconstructed in the B_s⁰→D_s^-X channel with D_s^-→φπ^-, K*⁰K^-. The B_s⁰ production flavor is determined using the large forward-backward asymmetry of polarized Z⁰→bb-bar decays and charge information in the hemisphere opposite that of the B_s⁰ candidate. The decay flavor is tagged by the charge of the D_s^±. From a sample of 361 candidates with an average B_s⁰ purity of 40%, we exclude the following values of the oscillation frequency: Δm_s<1.4 ps^-1 and 2.4<Δm_s<5.3 ps^-1 at the 95% confidence level

[en] We report a search for B_s⁰-B_s⁰ oscillations using a sample of 400 000 hadronic Z⁰ decays collected by the SLD experiment. The analysis takes advantage of the electron beam polarization as well as information from the hemisphere opposite that of the reconstructed B decay to tag the B production flavor. The excellent resolution provided by the pixel CCD vertex detector is exploited to cleanly reconstruct both B and cascade D decay vertices, and tag the B decay flavor from the charge difference between them. We exclude the following values of the B_s⁰-B_s⁰ oscillation frequency: Δm_s<4.9 ps^-1 and 7.9<Δm_s<10.3 ps^-1 at the 95% confidence level

[en] We have constructed and installed a pressurized straw vertex chamber in the Mark III experiment at the SLAC e⁺e^- storage ring SPEAR. The chamber consists of 12 concentric layers of straws, arrayed at radii between 5.4 cm and 13.0 cm from the interaction point. There are a total of 640 straws, each 8 mm in diameter and 84 cm long. We obtain an overall spatial resolution of 49 μm for argon-ethane (50%/50%) at 3 atm absolute using a cosmic ray data sample. The effects of gases on various chamber materials have been investigated. Chamber lifetime studies have been performed. A prototype chamber was used to study the resolution obtained with various gases. (orig.)

[en] This paper reports on results from charmed meson decays, obtained using the Mark III detector at the e⁺e^- storage ring SPEAR. First, a search for the lepton family number violating decay D⁰ → μe is described. A 9056 confidence level upper limit on B(D⁰ → μe) of 1.5 x 10^-4 is obtained. This limit can be used to place a lower bound on the masses of leptoquarks and other new particles that characterize models of family unification and other theories beyond the Standard Model. The second result is a precise measurement of the mass of the D_s*(2109.3 ± 2.1 ± 3.1 MeV/c²) produced exclusively with the D_s at Sr. root s = 4.14 GeV/c². The production cross section times branching ratio and the angular distributions are also measured