> -----Original Message----- > From: owner-brahms-dev-l@bnl.gov [mailto:owner-brahms-dev-l@bnl.gov]On > Behalf Of Trine Tveter > Sent: Monday, August 20, 2001 4:41 PM > To: brahms-dev-l@bnl.gov > Cc: trine@lynx.uio.no > Subject: Re: Vertex determination > > > Hi Ian, Claus and others, > > We've looked very briefly and qualitatively at vertex correlations > here in Oslo too, and we see nice correlations between BB and ZDC and > between BB / ZDC and track intersections with the beam plane (much like > Claus' plots) - there's only the question of an offset. From run 3969, > I very roughly determined "by hand": > bbpos = bbpos(raw) - 9 cm (approximately) > zdcpos = zdcpos(raw) - 42 cm (very inaccurate) > where the "raw" values are the ones delivered by BrBbRdoModule and > BrZdcRdoModule. We see similar values, but the width of the difference (BB-ZDC) is very broad. Perhaps this is because we use a version of BRAT which does not include some secret ZDC calibration... > > Ian wrote: > > > Is there a module which takes local TPM1 tracks and returns Z? > Is there > > another way one can do this? Say, any module which takes TPM1 data and > > returns Z? And can this be used in the context of Christian's > bratmain. > > Rumors from the north (of Copenhagen!) indicate something in the works, > > but I could not find anything in the html documentation on pii3. > > We're working on translating the BrTPMClusterVertexModule and > BrTPMTrackVertexModule to the Brat2 TPC class standard - our eminent > vertex expert Bjørn is unable to work full time on this right now, > but Truls, Bjørn and I will try to come up with something within the > next 1 - 2 weeks. That sounds good, except for the time scale. I had hoped for 1-2 hours :-) I suppose that once Djamel calibrates the BB, I'll take that to be the 'official' vertex, and be happy. Thanks for the update! -Ian > > Best wishes, > Trine > >
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