28 research outputs found
Data production models for the CDF experiment
The data production for the CDF experiment is conducted on a large Linux PC
farm designed to meet the needs of data collection at a maximum rate of 40
MByte/sec. We present two data production models that exploits advances in
computing and communication technology. The first production farm is a
centralized system that has achieved a stable data processing rate of
approximately 2 TByte per day. The recently upgraded farm is migrated to the
SAM (Sequential Access to data via Metadata) data handling system. The software
and hardware of the CDF production farms has been successful in providing large
computing and data throughput capacity to the experiment.Comment: 8 pages, 9 figures; presented at HPC Asia2005, Beijing, China, Nov 30
- Dec 3, 200
Data processing model for the CDF experiment
The data processing model for the CDF experiment is described. Data
processing reconstructs events from parallel data streams taken with different
combinations of physics event triggers and further splits the events into
datasets of specialized physics datasets. The design of the processing control
system faces strict requirements on bookkeeping records, which trace the status
of data files and event contents during processing and storage. The computing
architecture was updated to meet the mass data flow of the Run II data
collection, recently upgraded to a maximum rate of 40 MByte/sec. The data
processing facility consists of a large cluster of Linux computers with data
movement managed by the CDF data handling system to a multi-petaByte Enstore
tape library. The latest processing cycle has achieved a stable speed of 35
MByte/sec (3 TByte/day). It can be readily scaled by increasing CPU and
data-handling capacity as required.Comment: 12 pages, 10 figures, submitted to IEEE-TN
Second Generation Leptoquark Search in p\bar{p} Collisions at = 1.8 TeV
We report on a search for second generation leptoquarks with the D\O\
detector at the Fermilab Tevatron collider at = 1.8 TeV.
This search is based on 12.7 pb of data. Second generation leptoquarks
are assumed to be produced in pairs and to decay into a muon and quark with
branching ratio or to neutrino and quark with branching ratio
. We obtain cross section times branching ratio limits as a function
of leptoquark mass and set a lower limit on the leptoquark mass of 111
GeV/c for and 89 GeV/c for at the 95%\
confidence level.Comment: 18 pages, FERMILAB-PUB-95/185-
Jet Production via Strongly-Interacting Color-Singlet Exchange in Collisions
A study of the particle multiplicity between jets with large rapidity
separation has been performed using the D{\O}detector at the Fermilab Tevatron
Collider operating at TeV. A significant excess of
low-multiplicity events is observed above the expectation for color-exchange
processes. The measured fractional excess is , which is consistent with a strongly-interacting
color-singlet (colorless) exchange process and cannot be explained by
electroweak exchange alone. A lower limit of 0.80% (95% C.L.) is obtained on
the fraction of dijet events with color-singlet exchange, independent of the
rapidity gap survival probability.Comment: 15 pages (REVTeX), 3 PS figs (uuencoded/tar compressed, epsf.sty)
Complete postscript available at http://d0sgi0.fnal.gov/d0pubs/journals.html
Submitted to Physical Review Letter
Design and construction of the MicroBooNE detector
This paper describes the design and construction of the MicroBooNE liquid
argon time projection chamber and associated systems. MicroBooNE is the first
phase of the Short Baseline Neutrino program, located at Fermilab, and will
utilize the capabilities of liquid argon detectors to examine a rich assortment
of physics topics. In this document details of design specifications, assembly
procedures, and acceptance tests are reported
Measurement of the and Couplings in Collisions at TeV
We have directly measured the ZZ-gamma and Z-gamma-gamma couplings by
studying p pbar --> l+ l- gamma + X, (l = e, mu) events at the CM energy of
1.813.3 pb^-1)
for the electron (muon) channel, yields the following 95% confidence level
limits on the anomalous CP-conserving ZZ-gamma couplings: -1.9 < h^Z_30 < 1.8
(h^Z_40 = 0), and -0.5 < h^Z_40 < 0.5 (h^Z_30 = 0), for a form-factor scale
Lambda = 500 GeV. Limits for the Z-gamma-gamma$ couplings and CP-violating
couplings are also discussed.Comment: 11 pages, 1 table, and 3 figure
Measurement of the gauge boson couplings in Collisions at TeV
The gauge boson couplings were measured using () events at TeV observed with the
{D\O} detector at the Fermilab Tevatron Collider. The signal, obtained from the
data corresponding to an integrated luminosity of , agrees
well with the Standard Model prediction. A fit to the photon transverse energy
spectrum yields limits at the 95% confidence level on the CP--conserving
anomalous coupling parameters of ( = 0) and
( = 0).Comment: 16pages (14pages + 2figure pages) Uses ReVTEX Two postscript files
for figures will follow immediatel
W and Z Boson Production in PbarP Collisions at Sqrt(s)=1.8 TeV
The inclusive cross sections times leptonic branching ratios for W and Z
boson production in PbarP collisions at Sqrt(s)=1.8 TeV were measured using the
D0 detector at the Fermilab Tevatron collider:
Sigma_W*B(W->e, nu) = 2.36 +/- 0.07 +/- 0.13 nb,
Sigma_W*B(W->mu,nu) = 2.09 +/- 0.23 +/- 0.11 nb,
Sigma_Z*B(Z-> e, e) = 0.218 +/- 0.011 +/- 0.012 nb,
Sigma_Z*B(Z->mu,mu) = 0.178 +/- 0.030 +/- 0.009 nb.
The first error is the combined statistical and systematic uncertainty, and
the second reflects the uncertainty in the luminosity. For the combined
electron and muon analyses we find:
[Sigma_W*B(W->l,nu)]/[Sigma_Z*B(Z->l,l)] = 10.90 +/- 0.49.
Assuming Standard Model couplings, this result is used to determine the width
of the W boson:
Gamma(W) = 2.044 +/- 0.093 GeV.Comment: 11 pages (including 2 figure pages), in REVTEX. Two PostScript
figures are appended in a UUencoded fil