Can Chi, Genya, Zilu and anybody else interested get together at the lab
over the weekend to sort this out? We can also use the speakerphone if
that helps. It is important to understand this asap. I myself will try
to make it but clearly the principals need to get together to count the
deuterons bin-by-bin, and determine the symmetries with their
uncertainties. A factor of three in the uncertainty should be
understandable fairly quickly I would have thought.
Richard
On Fri, 23 Jul 2004, Genya wrote:
> Since there was a descripancy between the proposal and projected error
> bars (by Chi),
> I tried to do the projection separately.
> Please note, that Chi and me have somewhat different theoretical
> models and it may
> affect the projected errors, but not very much, IMO.
> Using my model, I measure Pzz of abou 80 %. In order to be
> conservative, I took Pzz=70%
> in my estimations.
> Calibrated by data from unpol runs, the target flux F=3*10**16
> at/sec, total thickness in the
> area +- 2 cm from the center is about t=8*10**13 at/cm**2, and the
> luminosity at 100 mA is
> about 5*10**31. We expect to collect 300kC of data.
> My results with these asumptions differ drastically from Chi's:
> Chi mine
> q, f-1 T20 dT20/T20, % dT20/T20, %
> 2.28 -0.83+-.03 3.6 1.4
> 2.66 -1.12+-.06 5.4 1.8
> 3.10 -1.25+-.11 8.8 2.6
> 3.62 -1.12+-.14 12.5 4.1
> 4.20 -0.68+-.17 25.0 10.2
>
> One can see that the difference in error bars projections is around
> factor of 3, which corresponds to almost
> factor of 10 in statistics !
> Two additional remarks. In all our data taken after shutdown I
> observe that we don't have enough elastic events.
> In pol and unpol runs, with D2 and H2. The difference is almost factor
> of 2. Possible explanations:
> a) another hole in the cell
> b) inefficiency in detection/tracking/cuts.
> c) I've made a mistake somewhere.
> At least point c) must be checked by someone other than me (Chi?)
> And we need to sit with Chi and work out our differencies in error
> bars projection.
>
> Genya
>
>
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