Hi,
here are my summarized conclusions from the Analysis meeting last Thursday
2006/04/06 and the Collaboration meeting last Friday 2006/04/07:
Crunching:
-Fix timing+pedestal issues in database, bugfixes (pathlenth and
missing entries) and tag and recrunch v3_4_19 hydrogen + 2004/5 deuterium
To determine kinematic corrections:
-Fix handling of MASCARAD to simulate realistic radiated ep
-Compare MC with RAD/ELOSS=on and off with realistic resolution and
parametrize effects on p_e and p_p
-Determine "residual" kinematic offsets for rad/eloss corrected
variables and parametrize in a suitable way
To use kinematic corrections:
-Resulting kinematic corrections from above are free of rad/eloss
effects and should be applied as such. It is up to the analyst
to decide wether the rad/eloss effects shall be accounted for in the
data reconstruction or in the Montecarlo only. In any case, observed
yields after applying residual kinematic corrections should resemble
MC yields with RAD/ELOSS turned on.
Spin angle:
-Define best spin angle profiles th_spin(z) for 32/47 degree data sets
from Genya's measurements
-Use spin angle map in Montecarlos for each of edel,epel,d(e,e'p)n and
determine most likely global offset to this given map (by matching
Pzz,hPz in both sectors for same Q2bin). Result should be a corrected
map from each above reaction channel, including an error estimate for
each offset.
-For each reaction edel,epel,d(e,e'p), compare yield-weighted average
for the three resulting maps from edel,epel,d(e,e'p) and see if they
agree within the error margin
-Define final map by error-weighted mean. This map will have to be
used by every analysis MC without modification.
Analyses:
-In general, above updates need to be applied, cuts revised
-d(e,e'p) hPz, AedV, AdT:
+Agreement of AedV with MC vs. pmiss improved after recrunch
+hPz still Q2 dependent even with new geometry. Mainly lowest Q2 bin
higher. Statistics allows to use smaller binning. Do data+MC yields
match as a function of Q2, and in each Q2bin as function of pmiss?
+Spin angle map in MC?
+Variation of extracted hPz with spin angle offset to the map?
-d(e,e'n) GEn:
+Mismatch data/MC yield at lowest Q2 bin. Such a mismatch could
potentially explain hPz problem from above
+Comparisons old/new extraction, highest Q2bin seems to come down
-p(e,e') inclusive:
+Event selection and backgrounds: trigger type 3 included
+MC comparisons with Epel+MASCARAD+MAID
+Other models? S-L, DMT?
+Mascarad properly combined with Epel? Polrad implementation?
-p(e,e'pi+):
+Need to define and apply most suitable kinematic correction
+Resolve yield discrepancy compared to Aki's analysis
+Verify error bars
+Implement S-L and DMT models in MC
+Cross section estimate to verify ballpark
+pi0 channel
-d(gamma,pn):
+Event selection, phase space and acceptance, cross section ballpark
confirmed.
+Empty-target yield?
+First extraction of T20 and T22 at theta=90. Opposite sign for T20.
+Montecarlo?
Regards,
Michael
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