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Measurement E57M2

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Experiment: Differential Photoproduction Cross Sections of the Λ(1520), 2013

Spokespersons: R. A. Schumacher

Experiment comment: All known corrections were applied to the yield extraction, normalization, and acceptance calculations in these data. The given error bars are essentially statistical but include the fit uncertainties assiciated with background subtraction. The overall systematic uncertainty in these results was estimated to be 11.6%.

Measurement comment: The first W bin for the L(1520) is only 30 MeV wide and centered at 2.035 GeV, rather than 100 MeV wide, since the wider bin size staddles the threshold. The first bin has an estimated normalization systematic of 36% on top of the 11.6% for the other bins.

Publication:

Quantity measured: dσ/dcos(θK+), mcbn
K+ angular distribution in CM frame.
Beam: γ, polarization: none
Target: p (Z=1, A=1), polarization: none
Final state: K+ Λ(1520), polarization: none

W : 2 — 2.8 GeV

Select data slice:
W = GeV
Observable quantity measured (Y axis): dσ/dcos(θK+), mcbn
Plot measurement data

Parameter (X axis): cos(θK+),

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Measured data:

W,
GeV 		cos(θK+) dσ/dcos(θK+),
mcbn 		Data errors,
mcbn
2.035 -0.85 0 0
2.035 -0.75 0.3818 0.1687
2.035 -0.65 0.0736 0.0253
2.035 -0.55 0.1091 0.0251
2.035 -0.45 0.1303 0.035
2.035 -0.35 0.1177 0.0282
2.035 -0.25 0.0553 0.0127
2.035 -0.15 0.0786 0.0127
2.035 -0.05 0.1016 0.0148
2.035 0.05 0.0802 0.012
2.035 0.15 0.0834 0.0121
2.035 0.25 0.1078 0.014
2.035 0.35 0.1296 0.0164
2.035 0.45 0.1583 0.018
2.035 0.55 0.1054 0.0145
2.035 0.65 0.1694 0.0209
2.035 0.75 0.1316 0.0299
2.035 0.84 0 0
2.1 -0.85 0 0
2.1 -0.75 0.1347 0.0536
2.1 -0.65 0.115 0.0168
2.1 -0.55 0.1086 0.015
2.1 -0.45 0.0982 0.0139
2.1 -0.35 0.1287 0.0418
2.1 -0.25 0.1782 0.0552
2.1 -0.15 0.1353 0.0274
2.1 -0.05 0.1264 0.0193
2.1 0.05 0.1742 0.025
2.1 0.15 0.1934 0.0213
2.1 0.25 0.3059 0.0286
2.1 0.35 0.3563 0.0293
2.1 0.45 0.376 0.0283
2.1 0.55 0.4561 0.0313
2.1 0.65 0.4245 0.0248
2.1 0.75 0.6135 0.0396
2.1 0.84 0.6366 0.0652
2.2 -0.85 0 0
2.2 -0.75 0.2219 0.0236
2.2 -0.65 0.184 0.0162
2.2 -0.55 0.1402 0.0139
2.2 -0.45 0.1566 0.0447
2.2 -0.35 0.1707 0.0433
2.2 -0.25 0.0894 0.0264
2.2 -0.15 0.2019 0.041
2.2 -0.05 0.2077 0.0263
2.2 0.05 0.2698 0.0257
2.2 0.15 0.2544 0.0227
2.2 0.25 0.3722 0.0256
2.2 0.35 0.3629 0.0223
2.2 0.45 0.511 0.0256
2.2 0.55 0.5309 0.0245
2.2 0.65 0.6959 0.0308
2.2 0.75 0.7051 0.035
2.2 0.84 0.6578 0.0532
2.3 -0.85 0.2232 0.0584
2.3 -0.75 0.1442 0.0169
2.3 -0.65 0.131 0.0148
2.3 -0.55 0.1458 0.0123
2.3 -0.45 0.1244 0.0112
2.3 -0.35 0.1252 0.0281
2.3 -0.25 0.1405 0.0212
2.3 -0.15 0.1818 0.0283
2.3 -0.05 0.1836 0.0192
2.3 0.05 0.2169 0.0195
2.3 0.15 0.2596 0.0197
2.3 0.25 0.308 0.0198
2.3 0.35 0.3974 0.0197
2.3 0.45 0.4039 0.0194
2.3 0.55 0.518 0.0229
2.3 0.65 0.5526 0.024
2.3 0.75 0.5873 0.0288
2.3 0.84 0.6168 0.0374
2.4 -0.85 0.1033 0.0241
2.4 -0.75 0.083 0.0144
2.4 -0.65 0.1001 0.0122
2.4 -0.55 0.1486 0.061
2.4 -0.45 0.1126 0.0429
2.4 -0.35 0.1135 0.0288
2.4 -0.25 0.1002 0.0208
2.4 -0.15 0.1194 0.0263
2.4 -0.05 0.1538 0.0177
2.4 0.05 0.1674 0.0161
2.4 0.15 0.1796 0.017
2.4 0.25 0.2611 0.0164
2.4 0.35 0.3293 0.0174
2.4 0.45 0.3724 0.0178
2.4 0.55 0.4989 0.0225
2.4 0.65 0.5422 0.0256
2.4 0.75 0.6443 0.03
2.4 0.84 0.6536 0.0389
2.5 -0.85 0.0639 0.0227
2.5 -0.75 0.0685 0.0126
2.5 -0.65 0.0656 0.0099
2.5 -0.55 0.0736 0.0088
2.5 -0.45 0.0625 0.0072
2.5 -0.35 0.0833 0.0282
2.5 -0.25 0.0516 0.0068
2.5 -0.15 0.0719 0.0196
2.5 -0.05 0.0707 0.0101
2.5 0.05 0.134 0.0132
2.5 0.15 0.1291 0.0108
2.5 0.25 0.2324 0.013
2.5 0.35 0.2539 0.0124
2.5 0.45 0.3256 0.0145
2.5 0.55 0.3979 0.0177
2.5 0.65 0.4366 0.0193
2.5 0.75 0.5848 0.0255
2.5 0.84 0.5648 0.0314
2.6 -0.85 0.0573 0.015
2.6 -0.75 0.0521 0.0109
2.6 -0.65 0.0461 0.0078
2.6 -0.55 0.0428 0.0069
2.6 -0.45 0.027 0.0056
2.6 -0.35 0.0214 0.0063
2.6 -0.25 0.0306 0.0051
2.6 -0.15 0.0276 0.0047
2.6 -0.05 0.0437 0.009
2.6 0.05 0.0539 0.007
2.6 0.15 0.0867 0.008
2.6 0.25 0.1252 0.008
2.6 0.35 0.1944 0.01
2.6 0.45 0.2559 0.0115
2.6 0.55 0.3306 0.0159
2.6 0.65 0.3906 0.0178
2.6 0.75 0.5053 0.0214
2.6 0.84 0.6184 0.0341
2.7 -0.85 0.0362 0.0213
2.7 -0.75 0.0551 0.012
2.7 -0.65 0.0329 0.0066
2.7 -0.55 0.0243 0.0061
2.7 -0.45 0.0293 0.0054
2.7 -0.35 0.0214 0.0046
2.7 -0.25 0.0248 0.0054
2.7 -0.15 0.0181 0.0036
2.7 -0.05 0.0281 0.0035
2.7 0.05 0.0498 0.0093
2.7 0.15 0.0496 0.0061
2.7 0.25 0.0908 0.0078
2.7 0.35 0.1365 0.0092
2.7 0.45 0.1467 0.0098
2.7 0.55 0.2389 0.0135
2.7 0.65 0.3309 0.0168
2.7 0.75 0.433 0.0202
2.7 0.83 0.4765 0.0317
2.8 -0.85 0 0
2.8 -0.75 0.04 0.0163
2.8 -0.65 0.032 0.0071
2.8 -0.55 0.0143 0.0049
2.8 -0.45 0.0163 0.0046
2.8 -0.35 0.0177 0.0039
2.8 -0.25 0.0137 0.0058
2.8 -0.15 0.0221 0.0036
2.8 -0.05 0.0264 0.0033
2.8 0.05 0.0348 0.0072
2.8 0.15 0.0441 0.0036
2.8 0.25 0.0429 0.0057
2.8 0.35 0.0786 0.0076
2.8 0.45 0.1259 0.0098
2.8 0.55 0.169 0.0113
2.8 0.65 0.2986 0.0153
2.8 0.75 0.4212 0.0209
2.8 0.83 0.4534 0.0323