γ Production at CDF Page: 4 of 16
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determine if the same is true for the T particles. Additionally, the T states allow
exploration of the low Pt region inaccessible to the charmonia measurements, which
do not extend below 4 GeV/c due to triggering constraints.
The data were collected in 1992-93 by the Collider Detector at Fermilab. The
CDF detector has been described in detail elsewhere [8]. The components relevant to
this analysis are briefly described here. The central tracking chamber (CTC) is in a
1.4 T axial magnetic field and has a resolution of 6Pt/Pt = (0.0011P)2 + (0.0066)2
for beam constrained tracks. The central muon chambers (CMU), at a radius of
3.5 m from the beam axis, are located behind 5 interaction lengths of calorimeter
and provide muon identification in the region of pseudorapidity i7"1 < 0.6, where 7 =
-ln[tan(0/2)] and 0 is the polar angle with respect to the beam axis. These chambers
are complemented by the central muon upgrade system (CMP) which consists of four
layers of drift chambers behind a total of 8 interaction lengths. Use of the CMP
considerably reduces hadronic punch-through backgrounds.
The measurements reported here are based on a 16.6 + 0.6 pb-1 data sample of
muon pairs collected with a three level online trigger. The level 1 trigger required two
charged track segments in the central muon chambers. The efficiency for this trigger
is 90% at P = 3.1 GeV/c and has a plateau of 94%. At level 2 at least one muon
segment was required to match a CTC track found by a hardware track processor.
The level 2 trigger is 90% efficient at Pt = 3.1 GeV/c and has a plateau of 93%.
The level 3 trigger used online track reconstruction software which required a pair of
fully reconstructed tracks matched to hits in the muon chambers. Both muons were2
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Abe, F. γ Production at CDF, report, July 1, 1995; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc620049/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.