[Clas_cascades] Comments on analysis note

[Elton Smith]

Hi Hovanes,

Hre are some suggestions to the analysis note;

title page, abstract

- Add "We set set limits on the production of a Xi-pi- narrow state,
searching in 20 MeV mass bins over mass range of 1.49 < M(Xi-pi-) < 2.2
GeV, of less than 3 nb. In the mass range corresponding to the observation
near the mass M=1.86 GeV, we set a 90% CL upper limit of less than 700 pb.
The experimental resolution of the Xi-pi- mass is sigma=7 MeV.

Question: 1. How do our limits depend on the mass window?

p. 35. last sentence and first sentences on p. 37:

I would give specific numbers from the analysis note: The measured cross
sections in eg3 for 4.5 < Eg < 5.0 GeV are higher than fitted g11 cross
sections by 9-14% depending on parameters of the fit, which were
determined over the interval 2-5 GeV. We take the normalization
uncertainty of the eg3 data to be 15% with a systematic uncertainty of 5%.

p. 36 Fig. 22. 'Black' and 'Red' lines interchanged in caption. Add
(nominal configuration for data) following 'Black' lines.

p. 37, Section 11 Systematics

We should add a table of systematic uncertainties with the major
contributions. As I understand it, these are

Source                                            Systematic Uncertainty
Cross section model dependence                    20%
Start Counter Acceptance for decaying particles    5%
Trigger efficiency                                10%
Quadrature sum                                    23%

State in the caption that use 30% overall systematic uncertainty.

p. 39 top. In the section about estimating upper limits, I would state
that we use a systematic uncertainty of 30%.

p. 49, Fig. 29. Add statement that this comparison ignores systematic
uncertainties in the computation of upper limits, and is presented for the
purpose of comparing various schemes for obtaining upper limits

p. 50. Add note that this comparison is made for fixed acceptance
uncertainties of 30%, and the Rolke method will be used as our nominal
method for extracting upper limits.

p. 51 Section conclusions (see previous questions)

Add he experimental resolution of the Xi-pi- mass is sigma=7 MeV. (I took
this from p. 27).

Also, do we have an estimate of the dependence of the upper limits on the
mass window used to extract it? We should add this to the conclusions and
will need it for the paper as well.

Thanks, Elton.

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