[Clas_cascades] Meeting notes Mar 31

[Elton Smith]

Present: Elton, Hovanes, Stepan
On the phone: Ralf, Zhiwen, Lewis<br>
Notes by Elton.

== Announcements==
# After completion of the Phi-- paper, there are several other analyses
that will be pursued: Lambda(1520) neutral/charged decays (Zhiwen); Sigma
(1385) (Haiyun), 2pi analysis of photocouplings with the help of Viktor
Mokeev (Lewis). Ralf will organize regular meetings to get feedback.

== Update on Phi--(Hovanes) ==
# Elton has started modifying the latex file from the committee to respond
to questions. Will add file to CVS for ease of editing.
# G11 corrections, multiple photon correction needed
#* Zhiwen checked that the eg3 data has about 80% single photons, 18%
double photons, 2% >2 photons.
#* eg3 analysis should use all events, loop over photons and determine
which ones lead to the exclusive reaction.
#* Lewis analysis includes all events, but takes the first photon in the
bank. Needs to check which photon falls into the neutron MM spectrum.
#* The comments from the committee list two corrections for G11: rate
dependence and trigger efficiency. I asked Rafaella about these two. She
said that the trigger inefficiency (should be corrected for our data), but
was an inefficiency for a single track: multiple track events did not need
this correction. The rate dependent correction was required for their 3
track omega analysis. They typically only needed to apply the rate
correction to their data which required less tracks than were measured.

== Lambda 1520 analysis ==
# Zhiwen said that he had problems with decaying K0's in GSIM. Apparantely
one need to use K0_short as in put
# A second problem is to decay the Lambda1520 in fsgen, because if this is
done in GSIM it gets confused with the non-standard particle code.

== Next Meeting April 7, 10:00 am ==
# Have draft of response to committee for comments (Elton and Hovanes)
# Update Delta produdction for both G11 and eg3 based on committee
comments.


Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton at jlab.org
(757) 269-7625
(757) 269-6331 fax