Hi,
here are the minutes of today's analysis meeting.
-Discussed some issues with the GEp/GMp paper.
-Luminosity based on unpolarized buffer runs quoted by Chris is ~4.8*10^13
atoms/cm^2; however in the ABS paper (D. Cheever et al.,
NIMA556_2006_410,
http://blast.lns.mit.edu/PRIVATE_RESULTS/USEFUL/HYDROGEN/ELASTIC/PAPER/bibliography/Cheever_NIMA556_2006_410.pdf
quoted target thickness is 7*10^13 atoms/cm^2. Genya was consulted,
investigating ...
-World data plotted ini Fig. 2 is based on Friedrich-Walcher database,
which however is just a collection of previously compiled data and some
more individual references. However, Arrington's database is all based on
cross sections; Arrington himself extracted GE and GM more elaborately
from this more complete dataset using more accurate radiative corrections
and finding suitable cross section renormalizations. Hence, the "world
data" referenced in Fig.2 will be the extraction from Arrington, and
indicated will be superponed the improved extraction including the Blast
data as a constraint.
-Some discussion wether or not the high-Q2 discrepancy should be discussed
as is or omitted or shortened: Note that at ~0.1<Q2<~0.4 The Blast data
is the first polarized data and the fact that it is quite consistent with
the unpolarized results in this region did not have to be that way.
Therefore the high-Q2 deviation does deserve some discussion, though
maybe shorter than at present.
-Chris is still working on the corrections and will provide an updated
draft when available.
-MC of radiative corrections (Mascarad-dgen version) was found to have
more problems
-For the generated p(e,e'p)gamma process, Mmiss^2 should be identical zero
but isn't as spotted by Yuan. Instead, Mmiss^2 right out of generator
looks like a radtail but is clearly not correct.
-One would expect a strong correlation between the angle of the emitted
photon and of the scattered electron but there isn't. Most of
the generated photons are emitted along the incoming electron direction
which is only half of the story.
-VZ will look into it.
-Aki has checked his elastic-radiative generator which he wrote based on
the Mascarad paper (=yet another generator besides the Mascarad-dgen one
and the envisioned ElRadGen generator by Sasha Iliychev.)
-Aki will send an email on how to use this generator in combination with
blastmc.
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. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| 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 | |
+-------------------------------------+--------------------------+
---------- Forwarded message ----------
Date: Fri, 7 Jul 2006 11:57:49 -0400 (EDT)
From: Michael Kohl <kohlm@mit.edu>
To: "[BLAST_ANAWARE]" <Blast_anaware@rocko.lns.mit.edu>
Subject: Special Blast analysis meeting on Wednesday 7/12/2006
Hi,
though I had announced earlier to cancel next week's meeting, we decided to
still have one on Wednesday 7/12/2006 at !! 10:00 !! at Bates.
Note that 10am was chosen as there is a STAR collaboration meeting ongoing at
MIT with a session on spin physics in the afternoon.
By the time Sasha Ilyichev will be at Bates. The meeting will be about
radiative corrections at Blast:
-Summarize status quo of treating radiative effects in Blast
-Define task list, priorities, estimate of effort
Sasha will also give us a presentation on details of the procedure of handling
radiative effects in elastic and inelastic scattering at the collaboration
meeting on Friday 7/14.
Best 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. | |
| - - - - - - - - - - - - | - - - - - - - - -|
| 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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