Hi Michael-
I have received calculations from Daniel Phillips as well, GC, GQ,
and GM, I assume the same that Chi rec'd. Am working to incorporate them
into my code soon. Currently I am working out stat error in Q2 and
overall systematic errors. H. Arenhoevel has sent me correspondence
regarding his conventions for relating the spherical and cartesian tensor
moments and I am working to reconcile any differences with what I am
using. H.A. will be sending calculations soon. I asked that he break
things up into different contributions (MECs etc). Also seeing
what happens when we go from two data points to one. This
exercise has a motivation that is two-fold. First, it lowers
statistical errors. Second, the weighted mean Q2 value will place
my G_M measurement in a region more barren of world data. Hopefully will
have something soon.
Cheers,
Pete
On Thu, 3 Feb 2005, Michael Kohl wrote:
> Hi,
>
> here are the minutes of our meeting yesterday:
>
> Visit of D. Phillips - Post-Discussion
> + Theoretical framework is very nice and highly appreciated
> + CZ received email from D. Phillips, needs to convert file format
> + Extraction of GEn from T20 (Schiavilla and Sick) is not further
> improved when T20 is improved, because T20 would only determine the
> G_Q piece in A, but the sensitivity to GEn is still coming from A;
> and is limited by the uncertainty of A. T20 by itself is
> proportional to GC/GQ, i.e. the isoscalar charge form factor, where
> GEn contributes at a 5% level only
> + Theory has some flaws though:
> Main weakness recognized is the issue to reproduce the quadrupole
> moment. In adjusting it, the theory leaves its path from first
> principles. Arising uncertainties not quantitatively clear.
> + Discussion about ion polarimeter measurement/theory normalization:
> The character of the theoretical uncertainty suggest to push for an
> ion pol measurement. A purely experimental error of comparable size
> like the theoretical is still preferrable, at least it adds
> information.
> It's not clear at this point if a measurement is now feasible.
>
> Kinematical corrections: Hydrogen method (EG) vs. MC method (AM)
> + Eugene showing dp=pe-pe(te) vs. pe, for various TOF numbers. Data
> from each TOF appear as slices
> + plotting projected dp histograms for individual TOFS: centroids
> appear to TOF-number dependent
> + angle reconstruction is fine theta_p - theta_calc(e): centroids
> zero, resolution <1 degree.
> + comparing pe and pecalc for different tofs:
> - p(theta) much better defined than p
> - pe resolution at forward angle (electrons) better than at larger
> angle
> - proton momentum better defined than electron momentum
> + Momentum corrections for electrons up to 50 MeV
> + Speculations why electron momentum is wrong:
> - TOSCA for Cerenkov shieldings?
> - Error in magnetic field map or its application
>
> Holding field map (AS, CZ)
> + Not discussed at this time
>
> Inclusive + N-Delta analysis (NM, TF, YX)
> + TF not present, NM has Wednesday class, YX needs more time
>
> Recrunch status and disk space
>
> Recrunch status:
> + Runs 11251-12672 have been lrn'ed with v3.4.4 (i.e. now they have
> "proper" DSTs). They are presently in ANALDIR/v3_4_4 and will soon
> be moved to $ANALDIR=/net/data/9/Analysis/data.
> + Backup copies of the original online-crunched runs 11251-12672 are
> on the buds (md5sum-checked) with links pointing to them in
> $ANALDIR/online_crunch.
> + $ANALDIR/v3_4_4 will be used further for lrd-recrunch(es).
> + Runs 12673-13266 have been lrd'ed and are in $ANALDIR/v3_4_4.
> + I will invoke a recrunch with lrn for runs 11250 backwards soon, in
> order establish "proper DSTs" and use improved
> calibrations. Previous online-crunch results will be temporarily
> backed up on the buds with links in ANALDIR/online_crunch.
>
> Disk space:
> + At present, one 750GB spud is completely available, and another,
> presently mirrored spud will be available after tape archiving is
> complete.
> + Yet another spud (750GB) would be available if pre-production data
> are deleted or moved
> + 1.5TB spud10 to be available soon
> + Two mirrored spuds are necessary at all times for DAQ during the new
> run
> + Enough space atpresent to start running, but need to extend after
> ~1 month
> + Desirable to have two analysis partitions, one which covers all lrn
> results, and one which covers all lrd results, i.e. two spud raids
> for analysis.
> + Consider to spend ~$8k for 2 more (spud11 and spud12), with >2TB
> raid servers.
>
> Regards,
>
> Michael
>
>
> --
>
> +-------------------------------------+--------------------------+
> | 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. | |
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> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
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> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
> | http://blast.lns.mit.edu | |
> +-------------------------------------+--------------------------+
>
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----------------------------------------------
Pete Karpius
Graduate Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)978-6152
FAX: (603)862-2998
email: karpiusp@einstein.unh.edu
http://pubpages.unh.edu/~pkarpius/homepage.htm
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