========================================================= Benchmark Data Set for Pion Photoproduction on the Proton ========================================================= Lothar Tiator, Universitaet Mainz, December 2000 - total number of data points: 3270 in 2 reactions: IR=1 (pi+) and IR=2 (pi0) for 3 observables: IO=1 (dsg), IO=2 (S) and IO=3 (T) - some data from GRAAL are still preliminary and should not be used in publication before contacting the authors - all other data are taken from the SAID data base the selection is more or less arbitrary with a preference for more recent data - the data set is split in 2 parts a low-energy set for Elab = 180 - 450 MeV a high-energy set for Elab = 450 - 1200 MeV the first one should be used for fitting the Delta resonance for fits of higher resonances both data sets should be combined - the errors given are in most cases statistical only, in some cases systematical errors are obvious and are sometimes given by the authors. However, for the benchmark set, no additional errors should be added, even if rather large Chi**2 of of more then 10 are possible ------------------------------------------------------------------------------- 1) low-energy dataset Elab = 180 - 450 MeV total number of data points: 1287 a) 317 points from 5 references for the diff. c.s. of pi+ 14 pts SASK 96 FISUM, PRC53, 1278(96) 83 pts BONN 72 FISCHER, ZP253, 38(72) 39 pts MAINZ 00 BRANFORD, PRC61, 014603(2000), 160 pts MAINZ 00 BECK, PRC61, 034604(2000), PC 0 21 pts BONN 80 E.J.DURWEN, PRP IR-80-7 80 b) 354 points from 3 references for the diff. c.s. of pi0 171 pts MAINZ 96 FUCHS, PLB368, 20(96), AHRENS, 92 pts MAINZ 97 HAERTER, PHD THESIS, 1997, AHRE 91 pts MAINZ 97 BECK, PRL78, 606(1997), PC 02-2 c) 245 points from 2 references for the photon asymm. of pi+ 85 pts LEGS 00 BLANPIED, PRC(2000) 160 pts MAINZ 00 BECK, PRC61, 034604(2000), PC 0 d) 192 points from 3 references for the photon asymm. of pi0 84 pts LEGS 00 BLANPIED, PRC(2000) 17 pts LEGS 92 BLANPIED, PRL69, 1880(1992), PC 91 pts MAINZ 97 BECK, PRL78, 606(1997), PC 02-2 e) 107 points from 1 references for the target polariz. of pi+ 107 pts BONN 96 DUTZ, NPA601, 319(1996) f) 72 points from 2 references for the target polariz. of pi0 34 pts BONN 98 BOCK, PRL81, 534(1998) 38 pts KHARK 83 BELYAEV, NPB213, 201(83) ------------------------------------------------------------------------------- 2) high-energy dataset Elab = 450 - 1200 MeV total number of data points: 1983 a) 554 points from 3 references for the diff. c.s. of pi+ 240 pts BONN 80 E.J.DURWEN, PRP IR-80-7 80 117 pts BONN 94 BUECHLER, NPA570, 580(94) 197 pts CALT 67 ECKLUND, PR159, 1195(67) b) 505 points from 4 references for the diff. c.s. of pi0 120 pts MAINZ 97 HAERTER, PHD THESIS, 1997, AHRE 50 pts MAINZ 99 KRUSCHE, EPJA6, 309(1999) 52 pts BONN 77 HUSMANN, NPB126, 436(77) 283 pts GRAAL 00 J.P. Bocquet, Oct 2000, prelimina c) 301 points from 4 references for the photon asymm. of pi+ 48 pts BONN 80 P.HAMPE, PRP IR-80-1 80 98 pts DNPL 79 BUSSEY, NPB154, 205(79) 92 pts GRAAL 00 AJAKA, PLB475, 372(2000), KUZNE 63 pts SLAC 74 KNIES, PRD10, 2778(74) d) 296 points from 2 references for the photon asymm. of pi0 158 pts YEREV 00 ADAMIAN, HAKOPIAN, PC 09-01-00 138 pts GRAAL 00 J.P. Bocquet, Oct 2000, prelimina e) 158 points from 4 references for the target polariz. of pi+ 103 pts BONN 96 DUTZ, NPA601, 319(1996) 22 pts BONN 76 ALTHOFF, PLB63, 107(76) 10 pts BONN 77 ALTHOFF, NPB131, 1(77) 23 pts TOKYO 82 FUJII, NPB197, 365(82) f) 169 points from 4 references for the target polariz. of pi0 18 pts BONN 98 BOCK, PRL81, 534(1998) 55 pts TOKYO 78 FUKUSHIMA, NPB136, 189(78) 74 pts DNPL 77 BOOTH, NPB121, 45(77) 22 pts BONN 77 HERR, NPB125, 157(77) ===============================================================================