The CDF II eXtremely fast tracker upgrade Page: 1 of 3
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t Fermilab
FERMILAB-CONF-06-280-E CDF
1
The CDF II eXtremely Fast Tracker Upgrade
A. Abulenciaa, P. Azzurrib, E. Cochranc, J. Dittmannd, S. Donatib, J. Efronc, R. Erbacher', D.
Erredea, I. Fedorkof *, G. Flanagang, R. Forrest', J. Gartnerc, H. Gerbericha, N. Giokarisf, S.
Hewamanaged, S. Holm h, R. Hughesc, A. Ivanov', M. Johnsonc, T. Jonesg, T. Junka, M. Kastena, B.
Kilminsterc, R. Kleinh, N. Krumnackd, K. Lannonc, S. Levinea, J. McKim', R. Mokosa, D. OlivitoC, B.
Parks, K. Pittsa, E. Rogersa, E. E. Schmidth, L. Scotth, T. Shawh, J. Slaunwhitec, A. Soha', A.
Staveris-Polykalasf, G. Veramendia, J. S. WIlsond, P. J. Wilsonh, B. Winer'
aUniversity of Illinois, Urbana, Illinois 61801 USA
bIstituto Nazionale di Fisica Nucleare Pisa, Universities of Pisa, Siena and Scuola Normale Superiore,
I-56127 Pisa, Italy
CThe Ohio State University, Columbus, Ohio 43210
dBaylor University, Waco, Texas 76796
eUniversity of California, Davis, Davis, California 95616
fNational and Capodistrian Univerity of Athens, Athens 10679, Greece, and Istituto Nazionale di Fisica
Nucleare, Pisa, I-56127, Italy
9Purdue University, West Lafayette, Indiana 47907
hFermi National Accelerator Laboratory, Batavia, Illinois 60510,USA
The CDF II eXtremely Fast Tracker is the trigger track processor which reconstructs charged particle tracks in
the transverse plane of the CDF II central outer tracking chamber. The system is now being upgraded to perform
a three dimensional track reconstruction. A review of the upgrade is presented here.1. Introduction
The eXtremely Fast Tracker [1] finds tracks in
the transverse plane of the CDF II Central Outer
Chamber (COT) [2] in time for the Level 1 trig-
ger decision. The XFT tracks are also matched
to electromagnetic-calorimeter clusters for online
electron identification, and to stubs in the muon
system for muon identification. The role of the
XFT in the trigger is to provide useful informa-
tion to reduce the raw collision rate (1.7 MHz) to
a maximum of about 30 KHz of more "interest-
ing" physics events which can be processed by the
Level 2 trigger. The XFT currently uses hit data
*Corresponding author.
email address: ivan.fedorko@pi.infn.itfrom the 4 axial superlayers of the COT, which
are arranged in cells of 12 wires each, for a to-
tal of 16,128 axial wires. A charged track passing
through an axial layer generates a characteristic
pattern of 12 hits, one per wire, with a charac-
teristic timing. Track identification is performed
in two processes by the Finder, which searches
for track segments in each of the 4 axial layers of
the chamber, and by the Linker, which searches
for 4/4 as well as 3/4 matches among segments
in the 4 layers, consistent with a track exiting
from the interaction point. The XFT measures
the transverse momentum and azimuthal angle
of all the tracks with PT > 1.5 GeV/c with an
efficiency greater than 96 % per track, and reso-
lution UPT /P ~ 2% (GeV-1) and o - 6 mR.
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Abulencia, A.; Azzurri, P.; Cochran, E.; Dittmann, J.; Donati, S.; Efron, J. et al. The CDF II eXtremely fast tracker upgrade, article, September 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc883238/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.