EXPERIMENTAL STUDY OF HEAVY CHARGED LEPTONS AT PETRA

title: Critical current, electro-mechanical properties and specific heat of bronze Nb-3_Sn conductors

title: Evidence for neutrino oscillations from muon decay at rest.
abstract: A search for {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations has been conducted at the Los Alamos Meson Physics Facility using {bar {nu}}{sub {mu}} from {mu}{sup +} decay at rest. The {bar {nu}}{sub {ital e}} are detected via the reaction {bar {nu}}{sub {ital ep}}{r_arrow}{ital e}{sup +}{ital n}, correlated with the 2.2 MeV {gamma} from {ital np}{r_arrow}{ital d}{gamma}. The use of tight cuts to identify {ital e}{sup +} events with correlated {gamma} rays yields 22 events with {ital e}{sup +} energy between 36 and 60MeV and only 4.6{plus_minus}0.6 background events. The probability that this excess is due entirely to a statistical fluctuation is 4.1{times}10{sup {minus}8}. A {chi}{sup 2} fit to the entire {ital e}{sup +} sample results in a total excess of 51.0{sub {minus}19.5}{sup +20.2}{plus_minus}8.0 events with {ital e}{sup +} energy between 20 and 60MeV. If attributed to {bar {nu}}{sub {mu}}{r_arrow}{bar {nu}}{sub {ital e}} oscillations, this corresponds to an oscillation probability (averaged over the experimental energy and spatial acceptance) of (0.31{plus_minus}0.12{plus_minus}0.05){percent}.

title: Measurement of the kaon content of three-prong tau decays.
abstract: We present branching fraction measurements of three-prong decays of the [tau][sup [minus]] lepton based on data from the TPC/Two-Gamma detector at SLAC PEP. The decays are classified according to the identities of the charged tracks to give simultaneous measurements of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][pi][sup +] [ital K][sup [minus]][ital K][sup +] [ital K][sup [minus]][pi][sup +][ital K][sup [minus]]][lt]0.09%, and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sup [minus]][ital K][sup +][ital K][sup [minus]]][lt]0.21%, where additional neutrals may be present in each case. The branching fractions are normalized to the world average three-prong topological branching fraction and there is an estimated 20% systematic error in addition to the listed statistical errors. We find the mass distributions in the [ital K][sup [minus]][pi][sup +][pi][sup [minus]] decay are consistent with [ital K][sub 1] dominance, and obtain branching fractions of [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1270)]=0.41[sub [minus]0.35][sup +0.41]% and [ital B][[tau][sup [minus]][r arrow][nu][sub [tau]] [ital K][sub 1][sup [minus]](1400)]=0.76[sub [minus]0.33][sup +0.40]%.

title: Measurement of Tau branching ratios
abstract: Using the data accumulated at LEP in 1989 and 1990 with the ALEPH detector, the inclusive and exclusive branching ratios of the τ lepton have been measured assuming lepton universality inZ0 decays. The inclusive branching fractions for the τ decay into one, three, and five charged particles have been determined to be (85.45±0.97)%, (14.35±0.48)%, and (0.10±0.05)%, respectively, in agreement with the world averages. New undetected decay modes are determined to have a branching fraction of less than 2.1% at 95% CL. The measured branching ratios for quasi-exclusive channels are slightly larger than, but consistent with the world averages, except for the modes τ→3 hadrons+vτ andτ→hadron+2π0vτ, which are significantly larger. These latter branching ratios have been found to be (9.5±0.7)% and (10.2±1.1)%, respectively. The sum of all the measured quasi-exclusive branching ratios is (100.4±1.8)%. A fully exclusive analysis of modes with neutral pions shows no evidence for new photonic decay modes with a branching fraction limit of 3.4% at 95% CL.

title: Experimental measurement of the mass of the tau lepton at the Beijing Electron Positron Collider (BEPC)

title: PROTON INDUCED DRELL-YAN DIMUON PRODUCTION AT 800 GeV

title: DISTRIBUTION OF SATELLITE GALAXIES IN HIGH-REDSHIFT GROUPS
abstract: We use galaxy groups at redshifts between 0.4 and 1.0 selected from the Great Observatories Origins Deep Survey to study the color-morphological properties of satellite galaxies and investigate possible alignment between the distribution of the satellites and the orientation of their central galaxy. We confirm the bimodal color and morphological-type distribution for satellite galaxies at this redshift range: the red and blue classes correspond to the early and late morphological types, respectively, and the early-type satellites are on average brighter than the late-type ones. Furthermore, there is a morphological conformity between the central and satellite galaxies: the fraction of early-type satellites in groups with an early-type central is higher than those with a late-type central galaxy. This effect is stronger at smaller separations from the central galaxy. We find a marginally significant signal of alignment between the major axis of the early-type central galaxy and its satellite system, while for the late-type centrals no significant alignment signal is found. We discuss the alignment signal in the context of shape evolution of groups.

title: Experimental study of f0(975) in J / psi decays

title: Implementation and performance of parallelized elegant
abstract: The program elegant is widely used for design and modeling of linacs for free-electron lasers and energy recovery linacs, as well as storage rings and other applications. As part of a multi-year effort, we have parallelized many aspects of the code, including single-particle dynamics, wakefields, and coherent synchrotron radiation. We report on the approach used for gradual parallelization, which proved very beneficial in getting parallel features into the hands of users quickly. We also report details of parallelization of collective effects. Finally, we discuss performance of the parallelized code in various applications.