122602157
Electron--positron inclusive hadron reactions
I would like to present some of the preliminary results of an experiment studying e+-e− interactions at the SPEAR colliding beam facility at SLAC. This experiment was predominately a single arm magnetic spectrometer for measuring e+-e− inclusive cross sections.
120716454
Evidence of muonium formation using thin gold foils in vacuum
122557716
Measurement of the polarization parameter in K+p elastic scattering at 1.60, 1.80, 2.11 and 2.31 GeV/c
Abstract The polarization parameter for K+p elastic scattering has been measured at 1.60, 1.80, 2.11 and 3.31 GeV/c incident momenta over the entire angular range with an emphasis on the backward region. The results in the extreme backward region appear to be small and consistent with zero.
122598679
Measurement of the polarization parameter in K$sup +$p elastic scattering
Full angular distributions of the polarization parameter in elastic ${K}^{+}p$ scattering at 1.37, 1.45, 1.60, 1.71, 1.80, 1.89, 2.11, and 2.31 GeV/c are presented. These data were obtained in an experiment at the Zero Gradient Synchrotron using a polarized proton target with arrays of scintillation and \ifmmode \check{C}\else \v{C}\fi{}erenkov counters to detect the scattered particles.
209999698
Inclusive gamma-Ray Spectra from psi (3095) and psi-prime (3684)
115886483
NEW PARTICLE SIGNALS AT THE SSC AND AT AN UPGRADED TEVATRON COLLIDER
59149695
One size fits all: Multiple uses of common modules in the ATLAS level-1 calorimeter trigger
The architecture of the ATLAS Level-1 Calorimeter Trigger has been improved and simplified by using a common module to perform different functions that originally required three separate modules. The key is the use of FPGAs with multiple configurations, and the adoption by different subsystems of a common high-density custom crate backplane that takes care to make data paths equal widths and includes minimal VMEbus. One module design can now be configured to count electron/photon and tau/hadron clusters, or count jets, or form missing and total transverse-energy sums and compare them to thresholds. In addition, operations are carried out at both crate and system levels by the same module design.
111114972
Commissioning Experience with the ATLAS Level-1 Calorimeter Trigger System
The ATLAS Level-1 Calorimeter Trigger is one of the main elements of the first stage of event selection for the ATLAS experiment at the LHC. The input stage consists of a mixed analogue/digital component taking trigger sums from the ATLAS calorimeters. The trigger logic is performed in a digital, pipelined system with several stages of processing, largely based on FPGAs, which perform programmable algorithms in parallel with a fixed latency to process about 300 Gbyte/s of input data. The real-time output consists of counts of different types of physics objects and energy sums. The production of final modules started in 2006, and installation of these modules and the necessary infrastructure at ATLAS has been underway for some time, with the intention of having a full system in situ during 2007, before first collisions at the LHC. The first experiences of commissioning and running the full scale system will be presented, along with results from integration tests performed with the upstream calorimeters, and the downstream trigger and data flow systems.
119726391
Isospin mixing of the 1+ doublet in 12C determined by low-energy pion scattering☆
With the Low Energy Pion Spectrometer (LEPS) at PSI the inelastic scattering of 50 MeV positive and negative pions to the 1+ excitations at 12.71 MeV (T = 0) and 15.11 MeV (T = 1) in 12C has been measured in the angular range 35°−105°. The angular distributions are in good agreement with impulse approximation calcculations. From the double ratio of the 1+ cross sections for π+ and π− scattering an isospin mixing matrix element of H01 = 157 ± 35 keV is derived. In contrast to a previous study of this reaction these results do not question the validity of the impulse approximation at low energies.
120448849
True Absorption and Scattering of 50-{MeV} Pions
The inclusive pion inelastic scattering and true absorption cross sections at 50 MeV were measured for ..pi../sup +/ on natural Li, C, Fe, Nb, and Bi and for ..pi../sup -/ on C, Fe, and Bi. The results show that ..pi../sup -/ cross sections are much larger than ..pi../sup +/, the difference being significantly larger than expected from a simple Coulomb calculation. In particular, in /sup 12/C the absorption of negative pions is about twice that of positive pions.
120295900
The ATLAS Level-1 Calorimeter Trigger
The ATLAS Level-1 Calorimeter Trigger uses reduced-granularity information from all the ATLAS calorimeters to search for high transverse-energy electrons, photons, τ leptons and jets, as well as high missing and total transverse energy. The calorimeter trigger electronics has a fixed latency of about 1 μs, using programmable custom-built digital electronics. This paper describes the Calorimeter Trigger hardware, as installed in the ATLAS electronics cavern.