Inclusive π0, η, and direct photon production at high transverse momentum in p+p and d+Au collisions at √sNN = 200 GeV

The STAR Collaboration, B.I. Abelev et al., Physical Review C 81 (2010) 064904 and eprint arXiv: 0912.3838

1. Cross section for π0 production at midrapidity in p+p collisions at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Cross section
(mb GeV-2 c3)		 Stat. error
(mb GeV-2 c3)		 Syst. error
(mb GeV-2 c3)
1.0–1.5 1.25 2.59×10-1 1.58×10-2 3.62×10-2
1.5–2.0 1.75 4.83×10-2 3.04×10-3 9.46×10-3
2.0–2.5 2.25 1.19×10-2 8.95×10-4 2.87×10-3
2.5–3.0 2.75 3.64×10-3 3.36×10-4 1.02×10-3
3.0–4.0 3.5 4.38×10-4 8.21×10-5 1.37×10-4
4.0–5.0 4.5 6.72×10-5 5.08×10-6 2.39×10-5
5.0–6.0 5.5 1.40×10-5 8.92×10-7 2.66×10-6
6.0–7.0 6.5 3.73×10-6 2.44×10-7 6.76×10-7
7.0–8.0 7.5 1.18×10-6 6.94×10-8 2.59×10-7
8.0–10.0 9.0 3.08×10-7 1.85×10-8 7.67×10-8
10.0–12.0 11.0 7.92×10-8 5.64×10-9 2.41×10-8
12.0–14.0 13.0 2.13×10-8 2.20×10-9 7.77×10-9
14.0–17.0 15.5 5.11×10-9 7.81×10-10 2.18×10-9

Note: normalization uncertainty of 11.7% is not included.

2. Cross section for π0 production at midrapidity in d+Au collisions at √sNN = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Cross section
(mb GeV-2 c3)		 Stat. error
(mb GeV-2 c3)		 Syst. error
(mb GeV-2 c3)
1.0–1.5 1.25 7.36×101 5.43×100 8.40×100
1.5–2.0 1.75 1.83×101 1.40×100 3.08×100
2.0–2.5 2.25 5.57×100 4.78×10-1 1.22×100
2.5–3.0 2.75 1.31×100 1.80×10-1 3.58×10-1
3.0–4.0 3.50 2.22×10-1 4.68×10-2 8.07×10-2
4.0–5.0 4.50 3.01×10-2 4.36×10-3 1.29×10-2
5.0–6.0 5.50 7.31×10-3 6.74×10-4 1.74×10-3
6.0–7.0 6.50 1.80×10-3 1.82×10-4 3.46×10-4
7.0–8.0 7.50 4.96×10-4 3.79×10-5 1.17×10-4
8.0–10.0 9.00 1.15×10-4 8.50×10-6 2.48×10-5
10.0–12.0 11.00 2.96×10-5 2.77×10-6 7.44×10-6
12.0–14.0 13.00 9.55×10-6 1.31×10-6 3.06×10-6
14.0–17.0 15.50 1.54×10-6 4.93×10-7 6.43×10-7

Note: normalization uncertainty of 5.3% is not included.

3. η/π0 ratio in p+p collisions at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 η/π0 Stat. error Syst. error
1.0–1.5 1.25 0.283 0.109 0.013
1.5–2.0 1.75 0.364 0.107 0.017
2.0–2.5 2.25 0.583 0.134 0.029
2.5–3.0 2.75 0.367 0.147 0.020
3.0–4.0 3.50 0.131 0.241 0.008
4.0–5.0 4.50 0.611 0.059 0.040
5.0–6.0 5.50 0.473 0.045 0.035
6.0–7.0 6.50 0.569 0.065 0.046
7.0–8.0 7.50 0.385 0.036 0.034
8.0–10.0 9.00 0.370 0.041 0.038
10.0–12.0 11.00 0.489 0.066 0.058
12.0–14.0 13.00 0.372 0.132 0.051

4. η/π0 ratio in d+Au collisions at √sNN = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 η/π0 Stat. error Syst. error
1.5–2.0 1.75 0.915 0.377 0.044
2.0–2.5 2.25 0.413 0.398 0.021
2.5–3.0 2.75 1.083 0.609 0.058
3.0–4.0 3.50 0.080 0.759 0.005
4.0–5.0 4.50 0.546 0.374 0.036
5.0–6.0 5.50 0.647 0.190 0.047
6.0–7.0 6.50 0.858 0.178 0.070
7.0–8.0 7.50 0.434 0.132 0.039
8.0–10.0 9.00 0.306 0.105 0.031
10.0–12.0 11.00 0.305 0.146 0.036
12.0–14.0 13.00 0.499 0.222 0.069

5. Nuclear modification factor RdA for π0 at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 RdA Stat. error Syst. error
1.0–1.5 1.25 0.723 0.046 0.117
1.5–2.0 1.75 0.965 0.066 0.236
2.0–2.5 2.25 1.187 0.105 0.373
2.5–3.0 2.75 0.917 0.136 0.349
3.0–4.0 3.50 1.291 0.352 0.607
4.0–5.0 4.50 1.141 0.167 0.580
5.0–6.0 5.50 1.328 0.112 0.339
6.0–7.0 6.50 1.224 0.116 0.281
7.0–8.0 7.50 1.074 0.066 0.315
8.0–10.0 9.00 0.948 0.054 0.278
10.0–12.0 11.00 0.950 0.084 0.336
12.0–14.0 13.00 1.140 0.173 0.504
14.0–17.0 15.50 0.765 0.265 0.422

Note: normalization uncertainty of 14.0% is not included.

6. Nuclear modification factor RdA for η at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 RdA Stat. error Syst. error
4.0–5.0 4.50 1.021 0.690 0.519
5.0–6.0 5.50 1.816 0.540 0.464
6.0–7.0 6.50 1.848 0.400 0.427
7.0–8.0 7.50 1.213 0.380 0.365
8.0–10.0 9.00 0.784 0.279 0.235
10.0–12.0 11.00 0.592 0.289 0.213
12.0–14.0 13.00 1.528 0.837 0.684

Note: normalization uncertainty of 14.0% is not included.

7. Nuclear modification factor RCP for π0 at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 RCP Stat. error Syst. error
1.0–1.5 1.25 1.032 0.095 0.000
1.5–2.0 1.75 1.179 0.113 0.000
2.0–2.5 2.25 1.268 0.167 0.000
2.5–3.0 2.75 1.061 0.233 0.000
3.0–4.0 3.50 1.198 0.478 0.000
4.0–5.0 4.50 1.425 0.235 0.060
5.0–6.0 5.50 1.149 0.151 0.049
6.0–7.0 6.50 0.860 0.162 0.036
7.0–8.0 7.50 1.129 0.107 0.080
8.0–10.0 9.00 0.888 0.083 0.063
10.0–12.0 11.00 0.975 0.150 0.069
12.0–14.0 13.00 0.850 0.214 0.060
14.0–17.0 15.50 1.040 0.342 0.074

Note: normalization uncertainty of 11.1% is not included.

8. Direct photon double ratio Rγ in p+p collisions at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Rγ Stat. error Syst. error
6.0–7.0 6.50 1.265 0.055 0.184
7.0–8.0 7.50 1.166 0.065 0.170
8.0–9.0 8.50 1.346 0.100 0.196
9.0–10.0 9.50 1.084 0.127 0.158
10.0–11.0 10.5 1.209 0.173 0.176
11.0–12.0 11.5 1.485 0.306 0.216
12.0–13.5 12.75 1.034 0.276 0.150
13.5–15.0 14.25 1.750 0.627 0.255

9. Direct photon double ratio Rγ in d+Au collisions at √sNN = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Rγ Stat. error Syst. error
6.0–7.0 6.50 1.049 0.066 0.153
7.0–8.0 7.50 1.203 0.082 0.176
8.0–9.0 8.50 1.381 0.120 0.204
9.0–10.0 9.50 1.301 0.153 0.194
10.0–11.0 10.50 1.332 0.192 0.200
11.0–12.0 11.50 1.422 0.268 0.217
12.0–13.5 12.75 0.806 0.214 0.125
13.5–15.0 14.25 2.028 0.700 0.323

10. Cross section for direct photon production at midrapidity in p+p collisions at √s = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Cross section
(mb GeV-2 c3)		 Stat. error
(mb GeV-2 c3)		 Syst. error
(mb GeV-2 c3)
6.0–7.0 6.50 3.73×10-7 7.71×10-8 2.01×10-7
7.0–8.0 7.50 8.11×10-8 3.15×10-8 6.11×10-8
8.0–9.0 8.50 6.01×10-8 1.74×10-8 2.84×10-8
9.0–10.0 9.50 < 3.07×10-8 (95% C.L.)
10.0–11.0 10.50 < 2.20×10-8 (95% C.L.)
11.0–12.0 11.50 7.52×10-9 4.74×10-9 3.15×10-9
12.0–13.5 12.75 < 4.66×10-9 (95% C.L.)
13.5–15.0 14.25 2.29×10-9 1.91×10-9 8.74×10-10

Note: normalization uncertainty of 11.7% is not included.

11. Cross section for direct photon production at midrapidity in d+Au collisions at √sNN = 200 GeV

pT range
(GeV/c)		 pT
(GeV/c)		 Cross section
(mb GeV-2 c3)		 Stat. error
(mb GeV-2 c3)		 Syst. error
(mb GeV-2 c3)
6.0–7.0 6.50 < 1.50×10-4 (95% C.L.)
7.0–8.0 7.50 3.43×10-5 1.33×10-5 2.28×10-5
8.0–9.0 8.50 2.19×10-5 6.77×10-6 1.11×10-5
9.0–10.0 9.50 8.10×10-5 4.01×10-6 4.59×10-6
10.0–11.0 10.50 4.60×10-6 2.61×10-6 2.54×10-6
11.0–12.0 11.50 2.89×10-6 1.80×10-6 1.50×10-6
12.0–13.5 12.75 < 2.30×10-6 (95% C.L.)
13.5–15.0 14.25 1.23×10-6 8.38×10-7 5.60×10-7

Note: normalization uncertainty of 5.3% is not included.

 For any questions please contact STAR Physics Analysis Co-ordinator : Bedanga Mohanty - bedanga@rcf.rhic.bnl.gov