Hi Concezio, we have a weight for SP5 signal MC to correct for the different ratio between non-resonant and resonant signal MC in SP5 and SP6. Cheers, Wolfgang Concezio Bozzi wrote: > OK, so we can use the run number in VirClass::Loop and use two separate > weights for D**/D+D* in SP5 and SP6. Could you remind me why we need to > reweight also signal MC? Are there any changes in signal MC between SP5 > and SP6? > Concezio. > > Il giorno mer, 19-07-2006 alle 14:26 +0000, Wolfgang Menges ha scritto: >> Hi Concezio, >> >> Yes, you are right about the SP8 work. For distinguishing SP5 and SP6 >> Kerstin did already some work. The run numbers are different in SP5 and >> SP6. if (run<3158000) selects SP5 events. I checked it and it works for >> signal MC and generic. >> >> Cheers, >> >> Wolfgang >> >> Concezio Bozzi wrote: >>> Hi all, >>> if we stay with SP5/6 I think that reweighting the D** wrt D+D* >>> separately for SP5 and SP6 would be the best we can do. But this means >>> that we need to know whether we are analysing SP5 or SP6 events when we >>> build the datasets in VVF, which I am not sure how to do. >>> Using SP8 means a lot of extra work/checks/tunings. >>> However it is not clear to me why when we compute the D** reweighting we >>> get 1 for SP5 and 0.83 for SP6, whereas we get 0.55 for (sp5+sp6). Well, >>> the fit might be just readjusting itself... >>> Concezio. >>> >>> Il giorno mer, 19-07-2006 alle 13:03 +0000, Wolfgang Menges ha scritto: >>>> Hi Heiko, >>>> >>>> Heiko Lacker wrote: >>>>> Hi Wolfgang, >>>>> >>>>>> There are two ways out. Either we switch to release 18 MC/SP8 which will >>>>>> have better D** description, better other things, but we have to adjust >>>>>> a lot of (more or less hard) coded numbers. But it will also solve the >>>>>> SP5/SP6 difference for the signal MC. We have to calculate new weights >>>>>> and magic factors. The other way is to apply some reweigting for SP5 to >>>>>> get the same as SP6. >>>>> This is in principle not possible as there are D** mass regions in >>>>> SP6 which have not been populated in SP5 :-( >>>>> >>>> That is a pity. So, my suggestion is to stick with SP5 AND SP6 or switch >>>> to SP8. >>>> >>>> Cheers, >>>> >>>> Wolfgang >>>> > -- ------------------------------------------------------------------------ Wolfgang Menges Queen Mary, University of London SLAC, MS 35 Mile End Road 2575 Sand Hill Road London, E1 4NS, UK Menlo Park, CA 94025, USA +44 20 7882 3753 ++1 650 926 8503 [log in to unmask] ------------------------------------------------------------------------