Tables of results
Figure 1
|
PT recoil [GeV/c] |
PYTHIA before correction Number of events |
PYTHIA after correction Number of events |
|
0.5 ÷ 1.0 |
4505 |
2185 |
|
1.0 ÷ 1.5 |
5804 |
3482 |
|
1.5 ÷ 2.0 |
6374 |
4123 |
|
2.0 ÷ 2.5 |
5934 |
4417 |
|
2.5 ÷ 3.0 |
5683 |
4404 |
|
3.0 ÷ 3.5 |
5022 |
4422 |
|
3.5 ÷ 4.0 |
4440 |
4222 |
|
4.0 ÷ 4.5 |
3738 |
3857 |
|
4.5 ÷ 5.0 |
3187 |
3495 |
|
5.0 ÷ 5.5 |
2737 |
3106 |
|
5.5 ÷ 6.0 |
2337 |
2742 |
|
6.0 ÷ 6.5 |
1933 |
2454 |
|
6.5 ÷ 7.0 |
1613 |
2153 |
|
7.0 ÷ 7.5 |
1365 |
1946 |
|
7.5 ÷ 8.0 |
1279 |
1646 |
|
8.0 ÷ 8.5 |
1047 |
1529 |
|
8.5 ÷ 9.0 |
884 |
1330 |
|
9.0 ÷ 9.5 |
782 |
1165 |
|
9.5 ÷ 10.0 |
766 |
1100 |
Table I – PTRecoil distribution of events simulated with
PYTHIA 6.4 and reconstructed before and after the boson’s PT correction
has been applied.
Figure 2 (upper)
|
PT electron [GeV/c] |
STAR data Number of events |
PYTHIA MC + Bg Number of events |
PYTHIA W+ -> t v Number of events |
PYTHIA Z0 -> e e Number of events |
Data driven QCD Number of events |
|
15 ÷ 18 |
142 ± 11.9 |
158.0 |
6.78 |
1.48 |
133.75 |
|
18 ÷ 21 |
159 ± 12.6 |
117.1 |
13.31 |
1.96 |
52.94 |
|
21 ÷ 24 |
142 ± 11.9 |
118.2 |
15.18 |
1.84 |
18.53 |
|
24 ÷ 27 |
153 ± 12.4 |
131.9 |
10.90 |
1.80 |
10.84 |
|
27 ÷ 30 |
166 ± 12.8 |
150.0 |
8.20 |
1.84 |
4.99 |
|
30 ÷ 33 |
222 ± 14.9 |
176.8 |
5.53 |
1.83 |
2.70 |
|
33 ÷ 36 |
207 ± 14.4 |
209.1 |
2.70 |
1.35 |
2.07 |
|
36 ÷ 39 |
214 ± 14.6 |
224.9 |
1.06 |
1.30 |
0.98 |
|
39 ÷ 42 |
157 ± 12.5 |
147.8 |
0.36 |
1.14 |
0.69 |
|
42 ÷ 45 |
93 ± 9.6 |
46.6 |
0.09 |
0.90 |
0.86 |
|
45 ÷ 48 |
27 ± 5.2 |
16.1 |
0.03 |
0.57 |
0.34 |
|
48 ÷ 51 |
13 ± 3.6 |
6.6 |
0.01 |
0.17 |
0.12 |
|
51 ÷ 54 |
8 ± 2.8 |
3.2 |
0.00 |
0.10 |
0.23 |
|
54 ÷ 57 |
1 ± 1.0 |
1.4 |
0.01 |
0.00 |
0.00 |
|
57 ÷ 60 |
3 ± 1.7 |
0.9 |
0.00 |
0.01 |
0.06 |
|
60 ÷ 63 |
0 ± 0.0 |
0.5 |
0.00 |
0.01 |
0.00 |
|
63 ÷ 66 |
0 ± 0.0 |
0.2 |
0.00 |
0.00 |
0.00 |
|
66 ÷ 69 |
2 ± 1.4 |
0.2 |
0.00 |
0.01 |
0.00 |
Table II - Estimated background contributions for the W+ ->
ev data yields.
Figure 2 (lower)
|
PT electron [GeV/c] |
STAR data Number of events |
PYTHIA MC + Bg Number of events |
PYTHIA W+ -> t v Number of events |
PYTHIA Z0 -> e e Number of events |
Data driven QCD Number of events |
|
15 ÷ 18 |
88 ± 9.4 |
89.5 |
1.82 |
1.62 |
84.56 |
|
18 ÷ 21 |
70 ± 8.4 |
40.7 |
3.22 |
2.20 |
29.59 |
|
21 ÷ 24 |
47 ± 6.9 |
28.2 |
3.52 |
2.16 |
12.74 |
|
24 ÷ 27 |
47 ± 6.9 |
25.5 |
2.47 |
2.14 |
5.20 |
|
27 ÷ 30 |
38 ± 6.2 |
30.4 |
2.49 |
1.80 |
3.17 |
|
30 ÷ 33 |
37 ± 6.1 |
38.4 |
1.28 |
1.61 |
2.08 |
|
33 ÷ 36 |
55 ± 7.4 |
49.8 |
0.74 |
1.30 |
1.14 |
|
36 ÷ 39 |
66 ± 8.1 |
62.7 |
0.19 |
1.10 |
0.83 |
|
39 ÷ 42 |
62 ± 7.9 |
42.6 |
0.07 |
1.10 |
0.36 |
|
42 ÷ 45 |
25 ± 5.0 |
14.4 |
0.06 |
0.86 |
0.26 |
|
45 ÷ 48 |
15 ± 3.9 |
4.6 |
0.00 |
0.36 |
0.10 |
|
48 ÷ 51 |
3 ± 1.7 |
1.9 |
0.00 |
0.09 |
0.05 |
|
51 ÷ 54 |
1 ± 1.0 |
0.9 |
0.02 |
0.04 |
0.00 |
|
54 ÷ 57 |
1 ± 1.0 |
0.5 |
0.00 |
0.01 |
0.10 |
|
57 ÷ 60 |
1 ± 1.0 |
0.2 |
0.00 |
0.00 |
0.05 |
|
60 ÷ 63 |
0 ± 0.0 |
0.04 |
0.00 |
0.00 |
0.00 |
|
63 ÷ 66 |
0 ± 0.0 |
0.13 |
0.00 |
0.00 |
0.00 |
|
66 ÷ 69 |
0 ± 0.0 |
0.00 |
0.00 |
0.00 |
0.00 |
Table III - Estimated background contributions for the W- -> ev data yields.
Figure 3
|
PTW [GeV/c] |
⟨ PTW ⟩ [GeV/c] |
AN(W+ →e+νe) |
AN(W− →e−νe) |
|
1.0 ÷ 2.5 |
1.8 |
0.07 ± 0.14 (st.)
± 0.004 (sy.)
|
0.54 ± 0.24 (st.)
± 0.033 (sy.) |
|
2.5 ÷ 4.0 |
3.3 |
0.01 ± 0.13 (st.)
± 0.001 (sy.)
|
0.37 ± 0.23 (st.)
± 0.054 (sy.) |
|
4.0 ÷ 5.5 |
4.7 |
0.03 ± 0.15 (st.)
± 0.002 (sy.) |
−0.01 ± 0.25 (st.)
± 0.001 (sy.) |
|
5.5 ÷ 7.0 |
6.2 |
0.45 ± 0.19 (st.)
± 0.020 (sy.) |
0.50 ± 0.39 (st.)
± 0.022 (sy.) |
|
7.0 ÷ 10.0 |
8.3 |
0.42 ± 0.19 (st.)
± 0.039 (sy.) |
0.33 ± 0.41 (st.) ± 0.03 (sy.) |
Table IV - The amplitude of the transverse
single-spin asymmetry for W± boson production as a function of PTW, in the |yW| < 1 region, measured by STAR in proton+proton collisions at √s=500 GeV
with a recorded luminosity of 25 pb-1. The average boson’s rapidity
value for each
PTW -bin is ⟨yW ⟩ = 0.0.
|
yW |
⟨ yW ⟩ |
AN(W+ →e+νe) |
AN(W− →e−νe) |
|
-0.6 ÷ -0.2 |
-0.38 |
0.15 ± 0.15 (st.)
± 0.053 (sy.) |
0.12 ± 0.29 (st.)
± 0.042 (sy.) |
|
-0.2 ÷ 0.2 |
0.00 |
0.27 ± 0.11 (st.)
± 0.004 (sy.) |
0.23 ± 0.21 (st.)
± 0.003 (sy.) |
|
0.2 ÷ 0.6 |
0.38 |
0.014 ± 0.13 (st.)
± 0.002 (sy.)
|
0.40 ± 0.24 (st.) ± 0.051 (sy.)
|
Table V
- The amplitude of the transverse
single-spin asymmetry for W± boson production as a function of yW, in the 0.5 GeV/c < PTW < 10 GeV/c
region, measured by STAR in proton+proton collisions
at √s=500 GeV with a recorded luminosity of 25 pb-1.
The average boson’s transverse-momentum value for each
yW -bin is ⟨PTW ⟩ = 5.3 GeV/c.
|
AN(Z0 →e+ e-) |
|
|
0.5 GeV/c < PTZ < 10 GeV/c −0.8<yZ <0.8 |
0.60 ± 0.33 (stat.) |
Table VI - The amplitude of the transverse single-spin
asymmetry for Z0
boson production, measured by STAR in proton+proton
collisions at √s=500 GeV with a recorded luminosity
of 25 pb-1.