119535040
Anomalous Production of High-Energy Muons in e + e − Collisions at 4.8 GeV
209999698
Inclusive gamma-Ray Spectra from psi (3095) and psi-prime (3684)
120716454
Evidence of muonium formation using thin gold foils in vacuum
115886483
NEW PARTICLE SIGNALS AT THE SSC AND AT AN UPGRADED TEVATRON COLLIDER
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.
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.
122968271
Proton radii determinations from the ratio of pi+ elastic scattering from 11B and 12C
Abstract A new method using low energy π + elastic scattering is employed to determine the proton matter distribution of a nucleus relative to an adjacent nucleus differing by one proton. The difference in the rms charge radii of 12 C and 11 B was determined to be 0.072 ± 0.021 fm with π + beam energies of 38.6 and 47.7 MeV.
56463206
Tracking with heavily irradiated silicon detectors operated at cryogenic temperatures
In this work we show that a heavily irradiated double-sided silicon microstrip detector recovers its performance when operated at cryogenic temperatures. A DELPHI microstrip detector, irradiated to a fluence of /spl sim/4/spl times/10/sup 14/ p/cm/sup 2/, no longer operational at room temperature, cannot be distinguished from a non-irradiated one when operated at T<120 K. Besides confirming the previously observed 'Lazarus effect' in single diodes, these results establish, for the first time, the possibility of using standard silicon detectors for tracking applications in extremely demanding radiation environments.
16459728
Study of LVDS serial links for the ATLAS level-1 calorimeter trigger
This paper presents an evaluation of the proposed LVDS serial data transmission scheme for the ATLAS level-1 calorimeter trigger. Approximately 7000 high-bandwidth links are required to carry data into the level-1 algorithmic processors from the Preprocessor crates. National Semiconductor’s Bus LVDS serialiser/deserialiser chipsets offer low power consumption at low cost and synchronous data transmission with minimal latency. Test systems have been built to measure real-time bit-error rates using pseudo-random binary sequences. Results show that acceptable error rates better than 10 13 per link can be achieved through compact cable connector assemblies over distances up to 20 m.
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.
110408854
Pre-production validation of the ATLAS level-1 calorimeter trigger system
The Level-1 Calorimeter Trigger is a major part of the first stage of event selection for the ATLAS experiment at the LHC. It is 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 trigger objects and energy sums. Prototypes of all module types have been undergoing intensive testing before final production during 2005. Verification of their correct operation has been performed stand-alone and in the ATLAS test-beam at CERN. Results from these investigations will be presented, along with a description of the methodology used to perform the tests.