[en] The Crystal Ball detector at SPEAR is used to analyze the decays psi' → γγpsi and psi' → γchi,chi → γγ. Values are obtained for the branching ratios of psi' → eta/μ⁰psi and psi' → γchi,chi → γpsi. No evidence is found for a 2¹S₀(eta'c) state in the mass range 3129 → 3644 MeV/c². Analysis of the angular distributions in the cascade chi decays yields spin and multipole assignments for the chi(3.51) and chi

[en] This document presents the current status of SiD's effort to develop an optimized design for an experiment at the International Linear Collider. It presents detailed discussions of each of SiD's various subsystems, an overview of the full GEANT4 description of SiD, the status of newly developed tracking and calorimeter reconstruction algorithms, studies of subsystem performance based on these tools, results of physics benchmarking analyses, an estimate of the cost of the detector, and an assessment of the detector R and D needed to provide the technical basis for an optimised SiD.

[en] A search for inclusive nu/sub μ/ oscillations has been performed in the Fermilab narrow band neutrino beam using two detectors running simultaneously at different distances from the neutrino source. The data show no signal and rule out oscillations of nu/sub μ/ into any other single type of neutrino for 20 < DELTAm² < 900 eV² and sin² (2theta) ) 0.03-0.10

[en] The Crystal Ball detector at SPEAR is used to analyze the decays psi' → γγpsi and psi' → γchi,chi → γγ. Values are obtained for the branching ratio of psi' → eta/π⁰psi and psi' → γchi, chi → γpsi. No evidence is found for a 2¹S₀(eta'(c)) state in the mass range 3129 → 3644 MeV/c². Analysis of the angular distributions in the cascade chi decays yields spin and multipole assignments for the chi(3.51) and chi(3.55)

[en] We present rates for same-sign dimuon production in neutrino-iron interactions with energies of 30 to 600 GeV. We find 101 neutrino and 15 anti-neutrino induced same-sign dimuons with muon momenta above 9 GeV/c. A detailed calculation indicates that the overall level and kinematic distributions of conventional backgrounds are consistent with the data. There is no convincing indication of new physical processes. 16 refs., 11 figs., 1 tab

[en] An existing neutrino detector (CCFR) and a specially constructed second detector are used to search for a disappearance of flux from the narrow band muon neutrino beam at FNAL. The detectors are located 715 m and 1116 m from the source of 40-230 GeV neutrinos, thus making the experiment sensitive to the oscillation parameters 10 < deltam² < 1000 eV² for sin²2theta>=0.05. A report on the status of the data analysis is presented

[en] The characteristics and mechanism of the self-quenched streamer mode have been explored using laser induced ionization. Both the size of the streamer signal and the transformation from proportional to streamer mode depend on high voltage and the primary ionization density. Two nearby tracks influence each other mainly by space charge effects. The zone of influence depends on relative drift time of the tracks but is less than 3 mm along the anode. The influence is less with argon-free strong quenching gas mixtures. (orig.)

[en] A hybrid readout system is being developed for installation in one module of the ATLAS scintillating Tile Calorimeter (TileCal) during the long LHC shutdown in 2013/2014. The hybrid combines a fully functional demonstrator of the full-digital system planned for installation in 2022 with circuitry to maintain compatibility with the existing system. This is the report on a second generation prototype link and controller board connecting the on- and off-detector electronics. The main logic component within this board is a XILINX Kintex-7 FPGA connected to an 12 ×5 Gbps SNAP12 opto transmitter and a 4 ×10 Gbps QSFP+ connector, for off-detector communication. One of the latter two will be chosen for the final design.

[en] We report a study of the dependence of limited streamer mode operation on gas composition. Results are given for the plateau onset voltage, plateau length, charge versus voltage, charge spectra and pulse width for various fractions of (Ar, CO₂, pentane) and (Ar, isobutane). In addition, a series of argon-free strong quenching gas mixtures has been studied which have very attractive characteristics. Chamber lifetime tests for these are also reported. As part of a study of the nature of the limited streamer mode mechanism, the response to X-rays and minimum ionizing particles are compared and differences noted. The character of the primary ionization is found to have a clear effect on the chamber response even in the streamer region. (orig.)

[en] The data acquisition system for the Crystal Ball project at SLAC is described. A PDP-11/t55 using RSX-11M connected to the SLAC Triplex is the basis of the system. A ''physics pipeline'' allows physicists to write their own equipment-monitoring or physics tasks which require event sampling. As well, an interactive analysis package (MULTI) is in the pipeline. Histogram collection and display on the PDP are implemented using the Triplex histogramming package. Various interactive event displays are also implemented