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Re: A note on mass resolutions in GlueX/HallD
Hall D PID Mail List:
Sorry for not asking this earlier - when you say "smeared using the new
functions" are you referring to Mark's functions?
At 1:02 PM -0400 3/15/08, Prof Paul Eugenio wrote:
>Hi Alex,
>
>Last night I ran some 3pi generated event through the new smearing
>functions. The events were generated with e^-5t distribution, and
>weighted with Adam's 3pi cross section what we used in the blind PWA
>studies. I subjected these events to fiducial cuts where events were
>accepted if 0.150 GeV < p_pion < 7 GeV and 1 deg < theta_pion < 140
>deg. These events were then smeared using the new functions. I found
>that the new routine return unsmeared momenta above 7GeV so I cut these
>out. I also smeared the beam by an expected(RTJ) 0.06% (0.02%
>accelerator + 0.04% tagger).
>
>I have attached 3 figures. The file 3pi_newSmear.pdf shows the t, 3pi,
>2 PiPlus, 2pi, mmsq, and cos_GJ. A fit to the mmsq over the same range
>as in your report results in a sigma of 0.27 GeV^2 (chisq/dof = 3.7).
>This is in good agreement with your result (0.33 GeV^2) and shows a
>slight improvement as expected.
>
>In your report you compared to an e852 sigma of 0.31 GeV^2. I came
>across a different published E852 mmsq sigma result. In Phys. Rev. D65
>072001, the mmsq has a sigma of 0.26 GeV^2(I have attached a clip from
>the paper in the file e852-3pi-mmsq.jpg). Note that E852 fit was over a
>wider range. I tried a fit over this same mmsq range. The result was a
>sigma of 0.30 GeV^2 but much poorer fit ( chisq/dof = 7.6 ). See plot
>in 3pi_new-mmsq-compare2E852.pdf.
>
>Paul
>
>
>--
>--
>Prof. Paul Eugenio
>Department of Physics
>Florida State University
>Tallahassee, FL USA
>
>850-644-2585
>eugenio@fsu.edu
>
>Attachment converted: Macintosh HD:3pi_newSmear 1.pdf (PDF /«IC») (002A76DE)
>Attachment converted: Macintosh HD:e852-3pi-mmsq 1.jpg (JPEG/«IC») (002A76DF)
>Attachment converted: Macintosh
>HD:3pi_new-mmsq-compare2E852 1.pdf (PDF /«IC»)
>(002A76E0)
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~