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Re: E852/GlueX table comparison



Hall D PID Mail List:

Hi Curtis,


I don't have access to this information.  I know of studies where we
varied the MC tracking chamber resolutions to match the data, but I do
not recall the resolutions in terms of particles and energies.   In any
event, the import comparisons are the physical quantities like effective
masses and missing mass.  

Also, recall that the missing mass takes into account both beam and
forward tracking.  The E852 beam resolution was dp/p ~ 1% whereas for
gluex we expect the beam spread to have two main contributions: 0.02%
accelator + 0.04% tagger.  The beam resolution is particular important
for PWA as it is used to define the boosts in obtaining decay angles. In
other words, the disadvantages of a solenoidal design is off set by
lower beam energy and better beam resolution(i.e. the E852 beam
ignorance is magnified by the greater boost).

Paul



On Fri, 2008-03-21 at 06:25 -0400, Alex Dzierba wrote:

> 
> 
> Paul Eugenio is probably in the best position to provide the
> E852/GlueX table comparison you request
> 
> 
> Cheers
> Alex
> ________________________________
>                 To: halld-collab@dustbunny.physics.indiana.edu
>                 From: Alex Dzierba <dzierba@indiana.edu>
> Subject: Source for Calorimeter Review Document
> Dear Friends
> 
> The source for the calorimeter review document (CDR) can
> be found here:
> http://dustbunny.physics.indiana.edu/~dzierba/CDR_Cal_source
> and for the PDF's go here:
> http://dustbunny.physics.indiana.edu/~dzierba/CDR_Calorimeter
> Cheers
> Alex
> ________________________________
> 
> 
> At 5:53 AM -0400 3/21/08, Curtis A. Meyer wrote:
> > Hi Alex --
> > 
> >    thanks for pointing this out. Oddly, all those references were in
> > the note
> > two days ago, but I had failed to "cite" them in the text, so in my
> > clean up,
> > I removed them. They should be easy to add back in, especially with
> > your file.
> > Somehow the original cal_cdr  bib file never made it into the files
> > that were
> > posted on the portal, perhaps it was in a directory that was not
> > caught in
> > the tarring up of the files?
> > 
> >     There has also  been a request from people for a table that
> > compares
> > GlueX and E852 energy and momentum resolutions. I do not know E852
> > well enough to put this together. Is there someone that could do
> > this on
> > a fairly short time scale?
> > 
> >        thanks again -- Curtis
> > 
> >     
> > On Fri March 21 2008, Alex Dzierba wrote:
> > > Hi Curtis
> > >
> > > There are some missing references in the Overview document.  I
> > > realize, of course, that checking for references is something that
> > is
> > > part of the proof-reading process.
> > >
> > > Figures 9, 16, 18 and 20 and associated text are from
> > > GlueX-doc-838-v3 (A Summary of Kinematics Relevant to the GlueX
> > > Experiment).  Figure 10 is from GlueX-doc-773-v1 (Introduction to
> > PID
> > > and TOF - Talk at the March 2007 GlueX Meeting).  Figures 2 and 3
> > are
> > > from a previously distributed note (Three Pion Production in
> > GlueX)
> > > which I have now posted as GlueX-doc-1006-v1 and Figure 5 is from
> > > another previously distributed note (K_short Error Estimates)
> > which
> > > has now been posted as GlueX-doc-1007-v1.  I want to caution that,
> > as
> > > noted in these latter two documents, mass error estimates are
> > based
> > > on the March 2007 tracking resolutions as reported by David
> > Lawrence
> > > in GlueX-doc-761.
> > >
> > > The bib file (cal_cdr) that I assembled for the calorimeter review
> > > pre-brief material has 52 entries for GlueX-docs that were cited
> > in
> > > the calorimeter review documents.  The cite key convention is
> > gxnnn
> > > where nnn is the doc number.   The attached bib file (cal_cdr_add)
> > > has the entries for the docs numbered 773 and 838 and the newly
> > > posted 1006 and 1007.  These can be copied and pasted into your
> > > current bib file.
> > >
> > > Cheers
> > > Alex
> > 
> > 
> > 
> > --
> > Professor Curtis A. Meyer        Department of Physics
> > Phone:  (412) 268-2745          Carnegie Mellon University
> > Fax:    (412) 681-0648            Pittsburgh PA 15213-3890
> > cmeyer@ernest.phys.cmu.edu  http://www.curtismeyer.com/
> 
> 
> 
> 
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Alex R. Dzierba
> Chancellor's Professor of Physics (Emeritus)
> Department of Physics / Indiana U / Bloomington IN 47405 /
> 812-855-9421
> JLab Visiting Fellow
> Jefferson Lab / 12000 Jefferson Ave / Newport News, VA 23606 /
> 757-269-7577
> Home Phone: 812-825-4063  Cell:  812-327-1881  Fax: 866-541-1263
> http://www.dzre.com/alex
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- 
--
Prof. Paul Eugenio
Florida State University
Department of Physics
205 Keen Building
Tallahassee, FL  32306  USA

(850) 644-2585
eugenio@fsu.edu