Transverse momentum dependent two-pion Bose-Einstein correlations in Au + Au collisions at 11.6 A {center_dot} GeV/c Page: 2 of 15
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0.6 (a) x02 bx102 (C
1000 2000
0.4 kt Iofteaeaetasesm-
0.2 500 10o Figure 1: The distribution
of the average transverse mo-
o 0 0 mentum (KT) vs. the rapid-
.. .., .. ity (y) and their projections for,
2 3 0 0.5 1.5 2 2.5 3 the 7r+7r+ [(a,b,c)] and 7-r
k, vs y k, (GeV/c) Y [(d,e,f)] pairs. The dotted lines
x 102
(d) (e) 1f) in the figures (b) and (e) rep-
0.6 A 1 x 102 resent the kT bins used in the
2000 analysis, and the dotted lines in
0.4 1000 the figures (c) and (f) show the
1000 rapidity regions selected.
0.2 500
0 0 0
k, vs y kr (GeV/c) Y
Spectrometer was designed for handling the high multiplicity environment. It
covers the forward rapidity region from 6 degrees to 28 degrees to the beam
by rotating the spectrometer. It has a small aperture of about 5 msr, and
consists of two dipole magnets, two tracking stations, and a Time-of-Flight
(ToF) wall. The first magnet (Ml) sweeps away low momentum particles, in-
cluding delta rays, in order to reduce the hit multiplicity on the first tracking'
station which follows the Ml. Each tracking station consists of a time projec-
tion chamber (TPC) sandwiched between a pair of projective drift chambers.
Accurate and efficient track reconstruction is provided by pattern recognition
in the two TPC's (TPC1 and TPC2) and fitting the tracks found in the TPC's
with additional projected drift chamber hits to straight lines. If the two inde-
pendently reconstructed straight tracks match inside the second magnet (M2),
the momentum associated with the matched trajectory is obtained from the
bending angle between the two tracks. After the momentum of the track is de-,
termined, the trajectory is projected toward the target through Ml to ensure
the tracks originated from the target. Particle identification up to 4 GeV/c for
7i is obtained by the ToF hodoscope behind the second tracking station with
75 psec timing resolution.
The data were taken in 1995. The total numbers of analyzed 7r+r+, r- -,
and 7+7r- pairs are 1.5 x 106, 1.5 x 106, and 2.5 x 106, respectively. A large2
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Lee, J. H. & Collaboration, E866. Transverse momentum dependent two-pion Bose-Einstein correlations in Au + Au collisions at 11.6 A {center_dot} GeV/c, report, December 1998; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc709975/m1/2/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.