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
> > >
> >
>