125254144
Recent results in $p \bar{p}$ collisions at 1.8-TeV from the CDF collaboration at the Fermilab Tevatron Collider
We present recent CDF results on heavy quark physics, electroweak phenomena, quantum chromodynamics, and searches for e ects beyond the Standard Model.
209999698
Inclusive gamma-Ray Spectra from psi (3095) and psi-prime (3684)
118211383
Inclusive particle production and anomalous muons in e+e− collisions at spear
Results are presented on hadron and muon inclusive production in e+e− collisions at √s=3.8 and 4.8 GeV. Anomalously large high momentum muon production is observed in noncoplanar two charged particle final states, but no anomalies are seen in multicharged particle final states. Arguments are presented that these extra muons do not come from charmed particles but could possibly come from heavy leptons. Results are also presented on a search for e+e− narrow resonances with 5.7 GeV<Mee<6.1 GeV. The T(5.97) was not seen in this scan which means that ree<100 ev. if the T has decay modes similar to the ψ and ψ′.
110997588
Radiation damage studies of a custom-designed VLSI readout chip
Two structurally similar versions of an NMOS custom VLSI circuit, fabricated by different manufacturers, have been irradiated with a /sup 60/Co source up to doses of 100 krad. Large differences in their behavior after irradiation have been seen and are thought to be due to the fabrication processes. These differences are observed in test structure measurements and overall chip performance. An increase in circuit noise causes one version of the chip to be unusable after radiation doses of 20 krad. >
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.
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.
56054123
Production Test Rig for the ATLAS Level-1 Calorimeter Trigger Digital Processors
R. Achenbach b , V. Andrei b , B. Bauss , B.M. Barnett . C. Bohm , J.R.A. Booth , I.P. Brawn , D.G. Charlton , C.J. Curtis , A.O. Davis , J. Edwards , E. Eisenhandler , P.J.W. Faulkner , F. Fohlisch , C. N. P. Gee , C. Geweniger , A.R. Gillman , P. Hanke , S. Hellman , A. Hidvegi , S. Hillier , E-E. Kluge , M. Landon , K. Mahboubi , G. Mahout , K. Meier , V.J.O. Perera , W.Qian , S. Rieke , F. Ruhr , D.P.C Sankey , R.J. Staley , U. Schafer , K. Schmitt , H.C. Schultz-Coulon , S. Silverstein , R. Stamen , S. Tapprogge , J.P. Thomas , T. Trefzger , D. Typaldos , P.M. Watkins , A. Watson , P. Weber , E.E. Woerhling a
27359669
The ATLAS level-1 calorimeter trigger architecture
The architecture of the ATLAS Level-1 Calorimeter Trigger system (L1Calo) is presented. Common approaches have been adopted for data distribution, result merging, readout, and slow control across the three different subsystems. A significant amount of common hardware is utilized, yielding substantial savings in cost, spares, and development effort. A custom, high-density backplane has been developed with data paths suitable for both the em//spl tau/ cluster processor (CP) and jet/energy-summation processor (JEP) subsystems. Common modules also provide interfaces to VME, CANbus and the LHC timing, trigger and control system (TTC). A common data merger module (CMM) uses field-programmable gate arrays (FPGAs) with multiple configurations for summing electron/photon and /spl tau//hadron cluster multiplicities, jet multiplicities, or total and missing transverse energy. The CMM performs both crate- and system-level merging. A common, FPGA-based readout driver (ROD) is used by all of the subsystems to send input, intermediate and output data to the data acquisition (DAQ) system, and region-of-interest (RoI) data to the level-2 triggers. Extensive use of FPGAs throughout the system makes the trigger flexible and upgradable, and several architectural choices have been made to reduce the number of intercrate links and make the hardware more robust.
15246775
Prototype Readout Module for the ATLAS Level-1 Calorimeter Trigger Processors
The level-1 calorimeter trigger consists of three subsystems, namely the Preprocessor, electron/photon and tau/hadron Cluster Processor (CP), and Jet/Energy-sum Processor (JEP). The CP and JEP will receive digitised calorimeter trigger-tower data from the Preprocessor and will provide trigger multiplicity information to the Central Trigger Processor and region-of-interest (RoI) information for the level-2 trigger. It will also provide intermediate results to the data acquisition (DAQ) system for monitoring and diagnostic purposes. This paper will outline a readout system based on FPGA technology, providing a common solution for both DAQ readout and RoI readout for the CP and the JEP. Results of building a prototype readout driver (ROD) module will be presented, together with results of tests on its integration with level-2 and DAQ modules.