213 Matching Results

Search Results

Advanced search parameters have been applied.

Kaon Filtering For CLAS Data

Description: The analysis of data from CLAS is a multi-step process. After the detectors for a given running period have been calibrated, the data is processed in the so called pass-1 cooking. During the pass-1 cooking each event is reconstructed by the program a1c which finds particle tracks and computes momenta from the raw data. The results are then passed on to several data monitoring and filtering utilities. In CLAS software, a filter is a parameterless function which returns an integer indicating whether an event should be kept by that filter or not. There is a main filter program called g1-filter which controls several specific filters and outputs several files, one for each filter. These files may then be analyzed separately, allowing individuals interested in one reaction channel to work from smaller files than using the whole data set would require. There are several constraints on what the filter functions should do. Obviously, the filtered files should be as small as possible, however the filter should also not reject any events that might be used in the later analysis for which the filter was intended.
Date: January 30, 2001
Creator: McNabb, J.
Partner: UNT Libraries Government Documents Department

BUBBLE DENSITY MEASUREMENT WITH THE HOUGH-POWELL DIGITIZER

Description: The maximum likelihood method is applied to HoughPowell Mark I flying spot digitizer bubble density measurements on bubble chamber tracks. The probabilities that a bubble will be recorded or missed are derived. Application of the maximum likelihood solutions obtained to Mark I data and to direct projection table measurements of the same track gave essentially the same results. (D.C.W.)
Date: January 1, 1963
Creator: Strand, R.C.
Partner: UNT Libraries Government Documents Department

Weighting mean timers for high energy physics electronics

Description: A new family of electronics circuits, weighting mean timer, is presented in this technical memo. Weighting mean timers can be used in high energy physics experiment electronics to implement the \concurrence" condition in hardware trigger stage. Several possible architectures of weighting mean timers have been discussed.
Date: November 1, 1998
Creator: Wu, J.
Partner: UNT Libraries Government Documents Department

Triggering BTeV

Description: BTeV is a collider experiment at Fermilab designed for precision studies of CP violation and mixing. Unlike most collider experiments, the BTeV detector has a forward geometry that is optimized for the measurement of B and charm decays in a high-rate environment. While the rate of B production gives BTeV an advantage of almost four orders of magnitude over e{sup +} e{sup {minus}} B factories, the BTeV Level 1 trigger must be able to accept data at a rate of 100 Gigabytes per second, reconstruct tracks and vertices, trigger on B events with high efficiency, and reject minimum bias events by a factor of 100:1. An overview of the Level 1 trigger will be presented.
Date: April 16, 1999
Creator: Gottschalk, Erik
Partner: UNT Libraries Government Documents Department

SVT: an online silicon vertex tracker for the CDF upgrade

Description: The SVT is an online tracker for the CDF upgrade which will reconstruct 2D tracks using information from the Silicon VerteX detector (SVXII) and Central Outer Tracker (COT). The precision measurement of the track impact parameter will then be used to select and record large samples of B hadrons. We discuss the overall architecture, algorithms, and hardware implementation of the system.
Date: July 1, 1997
Creator: Bardi, A.; Belforte, S. & Berryhill, J.
Partner: UNT Libraries Government Documents Department

The CDF silicon vertex tracker: Online precision tracking of the CDF silicon vertex detector

Description: The Silicon Vertex Tracker is the CDF online tracker which will re- construct 2D tracks using hit positions measured by the Silicon Vertex Detector and Central Outer Chamber tracks found by the eXtremely Fast Tracker. The precision measurement of the track impact parameter will allow triggering on events contain- ing B hadrons. This will allow the investigation of several important problems in B physics, like CP violation and B<sub>s</sub> mixing, and to search for new heavy particles decaying to b{anti b} .
Date: September 17, 1999
Creator: al., W. Ashmanskas et
Partner: UNT Libraries Government Documents Department

The CDF silicon vertex tracker: Online precision tracking of the CDF silicon vertex

Description: The Silicon Vertex Tracker is the CDF online tracker which will re- construct 2D tracks using hit positions measured by the Silicon Vertex Detector and Central Outer Chamber tracks found by the eXtremely Fast Tracker. The precision measurement of the track impact parameter will allow triggering on events contain- ing B hadrons. This will allow the investigation of several important problems in B physics, like CP violation and B<sub>s</sub> mixing, and to search for new heavy particles decaying to b{anti b}.
Date: August 24, 1999
Creator: al., W. Ashmanskas et
Partner: UNT Libraries Government Documents Department

Beam test results of the BTeV silicon pixel detector

Description: The authors have described the results of the BTeV silicon pixel detector beam test. The pixel detectors under test used samples of the first two generations of Fermilab pixel readout chips, FPIX0 and FPIX1, (indium bump-bonded to ATLAS sensor prototypes). The spatial resolution achieved using analog charge information is excellent for a large range of track inclination. The resolution is still very good using only 2-bit charge information. A relatively small dependence of the resolution on bias voltage is observed. The resolution is observed to depend dramatically on the discriminator threshold, and it deteriorates rapidly for threshold above 4000e{sup {minus}}.
Date: September 28, 2000
Creator: al., Gabriele Chiodini et
Partner: UNT Libraries Government Documents Department

The level 1 central tracking trigger for the D-Zero upgrade

Description: The D0 level 1 tracking trigger uses data from the scintillating fiber tracker, the central and forward preshower detectors, the muon system and the calorimeter. Tracks are found in the scintillating fiber tracker with transverse momentum greater than 1.5 GeV/c. The tracks are then sent to the central preshower detector for electron tagging and to the muon system for muon tagging. Preshower clusters are also used for identifying photon candidates. These multi detector triggers are then sent to the level 1 Trigger Framework where they are further combined with the calorimeter to create the final level 1 trigger. This paper presents an overview of the level 1 trigger system with emphasis on the use of large programmable logic devices (PLD�s) in an extensible system architecture that allows complex, multi detector triggers.
Date: July 22, 1999
Creator: F. Borcherding, S. Grunendahl, M. Johnson, K. Yip
Partner: UNT Libraries Government Documents Department

TRAJECTORIES FOR A RECTANGULAR MAGNET WITH UNIFORM FIELD

Description: To aid in orientation of a hodoscope system using a rectangular magnet with a uniform field, projections of the trajectory of particles in the horizontal and ventical planes are calculated approximately. Fringing field effects are represented by adding a correction to the length of the magnet and assuming the field to be uniform over the total effective length. The assumption that the source lies in the median plane of the magnet is also used in treating the vertical motion. (D.C.W.)
Date: February 1, 1963
Creator: Sternheimer, R.M.
Partner: UNT Libraries Government Documents Department