[Clas_cascades] Meeting notes 5/20

[Elton Smith]

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

== Announcements==
# Kijun is attending the exclusive workshop
# Zhiwen's defense will be at the end of June / beginning of July. Elton
is on the committee.

== Comments on Phi-- Note ==
# Elton updated the response to the trigger inefficiency question (29) and
checked it in.
# Hovanes was not available, but no recent changes have been checked in.

== Comments on Normalization Note ==
# Lewis: Updated both analysis and response to committee.
# Response to committee figures need to be 'add'ed to cvs and then
committed.
# Everyone is encouraged to read the updated analysis note and the
responses and give feedback to Lewis.
# The documents are linked from the wiki.
[http://clasweb.jlab.org/rungroups/eg3/wiki/images/b/b9/SecondRoundComments_Normalization.pdf
Normalization Note] and
[http://clasweb.jlab.org/rungroups/eg3/wiki/images/7/74/Usc_ana_note_eg3.v1.04.pdf
Analysis Note].
# Discussion:
#* Factor of 5.3 initial best estimate does not match triggered and
untriggered regions perfectly. The value of 6.7 is used in current
figures, but will also be updated slightly and new figures will be
generated.
#* In comparing g11 and eg3 above 4.5 GeV, the g11 point at about 4.7 GeV
should be omitted, since it uses a low performing T-counter. The
corresponding data in eg3 has been removed.
#* High mass background not subtracted in either g11 nor eg3 data, but
this will be used as a basis to support the Phi-- paper.

== gn -> K+Sigma*-(1385) ==
# [[KSigma update May 12 2010]]: Haiyun
# gn -> K+Sigma*-, Sigma*- -> Lambda pi-, Lambda -> p pi-. Final state is
K+ p pi- pi-.
#* Angular distributions placed on the wiki. Sigma*- show a "frown" and
the Sigma*0 show a "smile", indicating different exchange mechanisms.
#* Ralf: Assuming isospin symmetry, one would conclude that Sigma*- and
Sigma*0 should be produced throught the same mechanisms, so the difference
is interesting.


== Next Meeting May 27, 9:00 am ==
# Complete response to Phi-- committee


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