ρ0 photoproduction in
AuAu collisions at √sNN=62.4 GeV measured with the
STAR detector
Figure 1. Invariant mass plots
Trigger
A
Inv. Mass,
GeV/c^{2} |
Arbitrary Units |
Error | Same sign
bg (Arbitrary Units) |
Same sign bg Error
0.414
0.274661
0.275022
0
0
0.442
0.152453
0.152564
0
0
0.47
0.432059
0.216471
0
0
0.498
0.254603
0.147166
0
0
0.526
0.286299
0.143323
0
0
0.554
0.387051
0.158251
0.0645084
0.0645246
0.582
0.605144
0.191755
0
0
0.61
0.52515
0.175313
0
0
0.638
1.07179
0.246508
0.0564098
0.0564173
0.666
1.48674
0.292375
0
0
0.694
0.911772
0.228235
0.113972
0.080603
0.722
1.48586
0.291904
0
0
0.75
1.39064
0.278572
0
0
0.778
1.15314
0.252048
0
0
0.806
0.380978
0.144112
0
0
0.834
0.423027
0.149786
0
0
0.862
0.361839
0.137061
0.0516913
0.0517075
0.89
0.155048
0.0896522
0
0
0.918
0.0978948
0.0693263
0
0
0.946
0.197946
0.0994519
0
0
0.974
0.102627
0.0728239
0
0
1.002
0.210424
0.106335
0
0
1.03
0
0
0.0517139
0.051906
1.058
0
0
0.0464303
0.0466469
1.086
0.0492938
0.0496009
0
0
Trigger B
Inv.
Mass, GeV/c^{2} | Arbitrary Units | Error | Same sign
bg (Arbitrary Units) | Same sign bg Error
0.414 0.345927
0.158839 0
0
0.442 0.384771
0.114252
0.104438 0.10469
0.47 0.472585
0.0864094 0.0962047
0.0681753
0.498 0.371391
0.0626437 0.0980816
0.0567483
0.526 0.376037
0.0594001 0.0583241
0.0412885
0.554 0.439925
0.0671978 0
0
0.582 0.449796
0.0708903 0.0697643
0.0493816
0.61 0.611022
0.0912516 0.0846888
0.0599455
0.638 0.657736
0.0949754 0.0428468
0.042865
0.666 0.733473
0.104582
0.0468437 0.0468606
0.694 1.02409
0.124767
0.0953032 0.0674271
0.722 1.33464
0.14205
0.0945028 0.0668542
0.75 1.15406
0.131314
0.0939733 0.0664788
0.778 1.01432
0.123558
0.0943939 0.0667835
0.806 0.483272
0.0840088 0.0925933
0.0655262
0.834 0.451218
0.0827402 0.0948182
0.0671381
0.862 0.202926
0.0532418 0.0440638
0.0441117
0.89 0.120627
0.0408315 0
0
0.918 0.078986
0.0327546 0.0428781
0.0429916
0.946 0.013985
0.0140475 0.0455513
0.0457546
0.974 0.0553174
0.0283449 0
0
1.002 0.0519412
0.0268752 0
0
1.03 0.0477848
0.0352411 0.077821
0.0795108
1.058 0.0292182
0.0214212 0
0
1.086 0.0264182
0.0194829 0
0
Figure 2. pT distributions
p_{T}, GeV/c |
dN/dp_{T}, 1/(GeV/c) | Error | same sign pairs
dN/dp_{T}, 1/(GeV/c) |
Error
0.00625 72
8.48528 10.8201 3.28939
0.01875 257
16.0312 34.2636 5.85351
0.03125 458
21.4009 61.3138 7.83031
0.04375 579
24.0624 88.364 9.40021
0.05625 550
23.4521 81.1506 9.00836
0.06875 399
19.975 117.218 10.8267
0.08125 338
18.3848 153.285 12.3808
0.09375 247
15.7162 140.661 11.8601
0.10625 197
14.0357 131.644 11.4736
0.11875 185
13.6015 165.908 12.8805
0.13125 202
14.2127 171.318 13.0888
0.14375 228
15.0997 160.498 12.6688
0.15625 204
14.2829 142.464 11.9358
0.16875 181
13.4536 187.548 13.6948
0.18125 206
14.3527 185.745 13.6288
0.19375 194
13.9284 189.351 13.7605
0.20625 174
13.1909 156.891 12.5256
0.21875 184
13.5647 189.351 13.7605
0.23125 204
14.2829 209.188 14.4633
0.24375 201
14.1774 185.745 13.6288
0.25625 217
14.7309 210.992 14.5256
0.26875 192
13.8564 187.548 13.6948
0.28125 187
13.6748 173.121 13.1576
0.29375 178
13.3417 212.795 14.5875
0.30625 195
13.9642 180.335 13.4289
0.31875 190
13.784 214.598 14.6492
0.33125 174
13.1909 198.368 14.0843
0.34375 189
13.7477 173.121 13.1576
0.35625 167
12.9228 205.582 14.3381
0.36875 166
12.8841 178.531 13.3616
0.38125 163
12.7671 200.172 14.1482
0.39375 171
13.0767 167.711 12.9503
0.40625 187
13.6748 216.402 14.7106
0.41875 190
13.784 198.368 14.0843
0.43125 179
13.3791 198.368 14.0843
0.44375 172
13.1149 165.908 12.8805
0.45625 175
13.2288 171.318 13.0888
0.46875 159
12.6095 169.515 13.0198
0.48125 177
13.3041 156.891 12.5256
0.49375 182
13.4907 171.318 13.0888
Figure 3, dsigma/dt
t, (GeV/c)^{2}
| d^{2}#sigma/dydt, mb/(GeV/c)^{2} | Error
0.00075
1063.42 147.185
0.002
917.612 154.772
0.00375
541.589 69.9416
0.0075
209.95 36.5552
0.0185
27.7686 7.53213
0.0385
9.90006 3.56583
0.075
4.50234 1.47789
Figure 4. cross sections
sqrt{s_{NN}}, GeV
| #sigma, mb
zhalov
37.6
30
47
68
56.4
116
65.8
170
75.2
229
94
350
112.8
472
131.6
594
150.4
710
169.2
824
188
932
282
1421
376
1840
klein
30
11.07
46
42.95
62
88.74
74
127.58
100
216.18
130
318.04
150
383.64
170
446.94
200
537.46
280
755.1371
Goncalves and
Machado (IPSAT-GM)
40
81.6
62
205
130
586
200
875
300
1180
400
1416
500
1634
Goncalves
and Machado (IIM-GM)
40
80
62
182
130
447
200
644
300
858
400
1027
500
1167
measured
bin value
error
62
190.3 36
130
460 245.
200
530 60.1
For any questions please contact
STAR Physics Analysis Coordinator : Xin Dong - XDong@lbl.gov