Hi,
below are the minutes of today's analysis meeting.
Find today's presentations in
http://blast.lns.mit.edu/PRIVATE_RESULTS/USEFUL/ANALYSIS_MEETINGS/meeting_061221/
Merry Christmas and a Happy New Year to everyone.
Regards,
Michael
Minutes:
-PRL accepted by editor. Final version had to be shortened, left away
Fig. 1 (raw asymmetries).
-ed elastic:
+PK's latest extraction of T11 (see plot). Data updated (v3_4_21),
new calculation by Dan Phillips.
+Discussion about strategy to extract deuteron elastic form factors.
BLAST polarization observables (4 independent vector and
tensor asymmetries in two sectors) are characterized by two independent
form factor ratios (=overdetermined). The four asymmetries allow
to separately determine four analyzing powers/spin correlation
parameters. Absolute values of form factors require unpolarized response
functions A, B. In the minimal approach, use T20 and A to decompose GC
and GQ. Likewise, use A, T20 and T11 to independently determine GM (done
by PK in his thesis). In the "global" approach, form factor ratios
should be fitted directly to the asymmetries, with the complication of
having to determine also calibration constants such as Pzz and thd.
The main task of the analyses is to extract the asymmetries and their
errors. The extraction of form factor ratios or other derived
observables can be treated as a disjunct task.
Note that the "machinery" of extractions through fit procedures applies
to all reaction channels, from ep elastic, ed elastic, quasielastic to
the pion production.
+MK getting into Chi's codes ... using mpi software;
Still having problems to compile, some issues with shared libraries
Strategy: Cloning Chi's lates analysis tree, compile, reproduce
Chi's old results, verify extraction of Pzz and thd, verify runlist,
produce new results. Thereby learn to produce neat plots.
-Follow-ups on
+d(e,e'p): no report
Kinematic corrections folllow-up?
Progress toward final hPz?
Systematic errors?
Correlation between hPz and thd?
It is most important to extract hPz, its error and its correlation with thd
+d(e,e'n): see Eugene's plots
Separation of A_par, A_perp. Only A_perp carries information of GEn. In
PWIA, GEn can be directly extracted from A_perp. Determine FSI
as a correction factor on resulting A_perp from ratio of Montecarlo
simulation with Arenhoevel's model with FSI turned on/off.
The motivation for this approach is that is does not depend on the
matching of pmiss distributions and minimizes the model dependence of
the extraction.
Main task of remaining analysis: systematic errors, account
for correlation of hPz and thd.
Final, complete results envisioned for February/March.
-No reports from p(e,e') (Tavi), pion channels (Yuan, Aki).
+-------------------------------------+--------------------------+
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