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Hi Heiko, unfortunately, what I forwarded is all I know... Let me ask these questions in the EvtGen HN. Cheers, Kerstin On Sun, 8 Oct 2006, Heiko Lacker wrote: > Hi, > > Kerstin, do you know more details about this? > What is exactly missing and how could we fix it? > > One possibility would be to have SP6 produced with the correct > phase space factors. > > Cheers, > Heiko > > > On Tue, 3 Oct 2006, Kerstin Tackmann wrote: > > > > > Hi, > > > > this is a message from the EvtGen HN. It seems that the D** modeling > > for the lineshape was not quite correct in SP6 either. So not only > > are SP5 and SP6 different in D** modeling, but neither of them > > is really correct... and if you look at the plot linked below, you > > can see that these changes in the lineshape shift the peak of the > > mass distribution (I vaguely remember we wondered about why the peak > > was not at the nominal mean mass when we had a look at the D** > > modeling quite a while ago, Heiko...). > > > > This might be one ingredient in our "we don't quite understand > > our charm background" puzzle if similar things are true for the > > other D**... > > > > Cheers, > > Kerstin > > > > ---------- Forwarded message ---------- > > Date: Tue, 3 Oct 2006 07:53:53 -0700 > > From: David Lange <[log in to unmask]> > > To: [log in to unmask] > > Newsgroups: > > http://babar-hn.slac.stanford.edu:5090/HyperNews/get/event_gen.html > > Subject: Re: Question on the differences of the generated D_0*0 shape > > between SP6 and SP8 MC > > > > *** Discussion title: Event Generators > > Email replies to [log in to unmask] must include: > > In-Reply-To: <[log in to unmask]> > > Subject: ...change this to be about your reply. > > > > Hi Liaoyuan > > > > I guess you mean 'between sp6 and sp8' below. As your plot illustrates > > nicely, some factors were missing in sp5/sp6 lineshapes, in this case, > > most importantly phase space factors. If you add the appropriate phase > > space factors to your BW curve, you should get the sp8 curve. > > > > david > > > > Liaoyuan Dong wrote: > > > *** Discussion title: Event Generators > > > Email replies to [log in to unmask] must include: > > > In-Reply-To: <"/event_gen/498"@babar-hn.slac.stanford.edu> > > > Subject: ...change this to be about your reply. > > > > > > Dear EvtGen experts, > > > > > > I found there are big differences of the generated D_0*0 shape > > > between SP6 and SP8 MC. > > > > > > I got the D_0*0 shape using the mcTruth information, > > > The plots for SP6 and SP8 are shown at: > > > > > > http://www.slac.stanford.edu/~dongly/hn/sp6sp8.ps > > > > > > The upper plot shows the D_0^*0 shape for SP6 signal MC, > > > the lower plot shows the D_0^*0 shape for SP8 signal MC. > > > > > > The red curves are the fits with the D_0*0 mass and width > > > fixed at the input values (Mass = 2308 MeV and width = 276 MeV). > > > So the generated D_0*0 shape of SP6 MC is consistent with > > > the input values. > > > > > > Why there are big differences of the generated D_0*0 > > > shape between SP5 and SP6 MC ? > > > > > > Thanks for any help ! > > > > > > Cheers, > > > Liaoyuan > > > > > >