Hi, A short comment. I believe that the parametrization comes from the study by Eun-Joo. I have at least used that for my analysis. For most momenta the effect of absorption and m.s. is worse for FS than FFS, but I remember that they were similar or reversed for high momenta. It is clear that this is a bit funny, but at that time there was not time for a new study and in the relevant momentum range I think everything was fine i.e. correction FFS<FS. You might take a look in my thesis where the prametrisations are drawn and where I think there is a reference to the source. Cheers, Peter :-) --------------------------- )-: Peter H L Christiansen pchristi@nbi.dk / (+41)764870425 :-D --------------------------- \-: On Thu, 22 Dec 2005, Truls Martin Larsen wrote: > Hi, > > I have observed the same thing... When I saw the numbers the first time > I thought the same ting... I searched through Djamels thesis and other > places but were unable to find the number written elsewhere. > > It surely looks odd!!! Unless people using their own versions of method1 > has done anything to these numbers they could well end up in the > correction... > > Cheers, > Truls > > > > On Wed, 2005-12-21 at 19:46 -0500, Flemming Videbaek wrote: >> I am puzzled about the parameters in the fstree2datamap for >> absorption. >> The code reads (see below) that absorption is smaller of FS than FFS. >> Has this been used for a long time. I hope I read oit wrong or it has >> not been used. >> >> In any case I am not able to reproduce these numbers (for p-bar) and >> get more absorption. >> will post some plot for tomorrow. >> >> flemming >> >> >> >> //_____________________________________________________________________________ >> TF1* GetAbsorpFunc(Int_t pid, Char_t pol, Int_t angle) >> { >> // set correction parameters >> TF1* absorpFunc = new TF1("absorpFunc", "[0]-[1]*exp(-[2]*x)", 0.0, >> 30.0); >> absorpFunc->SetParameters(1.0, 0.0, 0.0); >> >> if (pid != Selector::kProton) return absorpFunc; >> >> if (gPidMethod == "H1") // means only FFS >> { >> if (angle <= 4 && pol == 'B') // proton >> absorpFunc->SetParameters(0.9544, 0.1038, 0.193); >> if (angle <= 4 && pol == 'A') // anti-proton >> absorpFunc->SetParameters(0.9386, 0.1029, 0.1784); >> >> if (angle > 4 && pol == 'B') // proton >> absorpFunc->SetParameters(0.9824, 0.0217, 0.06053); >> if (angle > 4 && pol == 'A') // anti-proton >> absorpFunc->SetParameters(0.9704, 0.02623, 0.1277); >> absorpFunc->SetParameters(0.9704, 0.02623, 0.1277); >> } >> elsce >> { >> if (angle <= 4 && pol == 'B') // proton >> absorpFunc->SetParameters( 0.995, 0.2289, 0.1105); >> if (angle <= 4 && pol == 'A') // anti-proton >> absorpFunc->SetParameters(0.9637, 0.2710, 0.148 ); >> >> if (angle > 4 && pol == 'B') // proton >> absorpFunc->SetParameters(0.9627, 0.05202, 0.1181); >> if (angle > 4 && pol == 'A') // anti-proton >> absorpFunc->SetParameters(0.9516, 0.06252, 0.1741); >> } >> >> -------------------------------------------- >> Flemming Videbaek >> Physics Department >> Bldg 510-D >> Brookhaven National Laboratory >> Upton, NY11973 >> >> phone: 631-344-4106 >> fax: 631-344-1334 >> e-mail: videbaek @ bnl.gov > > _______________________________________________ > Brahms-dev-l mailing list > Brahms-dev-l@lists.bnl.gov > http://lists.bnl.gov/mailman/listinfo/brahms-dev-l > _______________________________________________ Brahms-dev-l mailing list Brahms-dev-l@lists.bnl.gov http://lists.bnl.gov/mailman/listinfo/brahms-dev-lReceived on Fri Dec 23 05:55:07 2005
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