Re: Minutes of the 2006/04/12 Blast analysis meeting

From: Adrian T Sindile (asindile@cisunix.unh.edu)
Date: Wed Apr 12 2006 - 18:23:08 EDT


Hi Michael,
I used channel 266 in all my simulations (with default cutoff), so the
results I presented then should be valid.

Thank you,
Adrian

> -Mascarad handling
> +Mascarad channel "666" only produces tail, starting from low energy
> cutoff. Default is 10 MeV
> +Use channel "266" (mixes Epel and Mascarad) for realistic MC
> Sum of unradiated and radiated yield should reproduce total elastic
> cross section (important to normalize radtail for inelastic
> channels).
> +The smaller the low-energy cutoff, the more the Mascarad part is
> weighted (automatically in "266", however renormalization of total
> cross section required). The cutoff can be chosen in the input
> file.
> +Cutoff should be smaller than the resolution, but large enough to
> not cause numerical instabilities. Present default is 10 MeV, resolution
> is ~30 MeV.
> +To-do-list for Mascarad users (Eugene, Adrian,...):
> Run Epel+Mascarad ("266") for different low-energy cutoff values and
> compare MC yield with data (W spectrum). Find range of cutoff values
> for which MC/data doesn't vary, assuming realistic resolution (!)
> +Tune the resolution such that MC best reproduces data. Tip: look at
> ratio MC/data versus W for all adjustments of cutoff and resolution
> +Goal: By how much does the location of the W peak maximum bin shift
> compared to the unradiated peak position depending on the resolution?
> This result should be parametrized and separately accounted for along
> with energy loss of the proton when "residual kinematic corrections" are
> determined.
>
>
> -Shifted acceptance
> +Acceptance has not shifted in data reconstruction
> +Discrepancy between data and MC at forward angles for d(e,e'p)n and
> d(e,e'n)p, see Eugene's and Adam's plots (meeting_060412)
> +Tossing volume starts at 24 degrees which is too large, should be 22
> degrees or smaller
> +VZ attributes discrepancy to the way the white generator distributes
> events in phase space, giving poor yield at small angles but I don't
> buy this
> +Tossing volume should be at least as large as necessary to cover all
> resolution smearing.
> +Unclear how hPz at smallest Q2bin is affected
>
>
>
>
>
> +-------------------------------------+--------------------------+
> | Office: | Home: |
> |-------------------------------------|--------------------------|
> | Dr. Michael Kohl | Michael Kohl |
> | Laboratory for Nuclear Science | 5 Ibbetson Street |
> | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
> | Middleton, MA 01949 | U.S.A. |
> | U.S.A. | |
> | - - - - - - - - - - - - | - - - - - - - - -|
> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
> | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
> | http://blast.lns.mit.edu | |
> +-------------------------------------+--------------------------+
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-- 

------------------------------------------------------------------------ Adrian Sindile Room 205A, DeMeritt Hall Research Scientist phone: (603)862-1217 Xenon Imaging Center & FAX: (603)862-2998 Nuclear Physics Group email: asindile@unh.edu University of New Hampshire http://einstein.unh.edu/~adrian/ ------------------------------------------------------------------------



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