E852 experiment

Analysis of Eta Pi0 system with the decay Eta -> Pi+ Pi- Pi0

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Comments of Suh-Urk Chung

Date: Tue, 6 Sep 2005 15:37:48 -0400 (Eastern Standard Time) From: Suh-Urk Chung I would like to know if your results are in agreement with the last (and the final) report on the GAMS results. Please refer to the paper by Sadovsky, LEAP98, NP A655, 131c (1999) In this paper, he sets the mass at 1370 MeV (our E852 value) and then he fits the widths of P+ and P0 and finds satisfactory fits with \gamma(P+)=300+/-125 MeV and \gamma(P0)=225+/-50 MeV I would like to see if we obtain similar results using the same techniques. In particular, we will want to know what the difference in the likelihood is between this new fit and your final fit. Let me know what you think.

Answer

Suh-Urk,

1.Sadovsky don't fit mass of EtaPi0. It is bad. He fixed a value of our mass from EtaPi- paper. But he found a width \gamma(P+)=300+/-125 MeV, which is consistent with our result, where we fit as a mass so a width. It is our adventures.

2.We cant repeat Sadovsky's method of selecton the single physical solution. A ratio UNPE/NPE have large errors (see note Part 2. Fig.3). We have worse statistics. It is also a reason why we can't analysis P0 and other UNPE waves.

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Date: Wed, 14 Sep 2005 14:59:37 -0400 (Eastern Standard Time) From: Suh-Urk Chung

I would like to see a plot of chisq/dof as a function of mass from 1250 1450 MeV, while the width is left a variable to be fitted.

This will show how significant you fitted mass of 1270 MeV is. (refer to your Part 2). And how consistent (or inconsistent) your fit is, compared to the Sadovsky fit.

Answer

Here is figures of chisq/dof and width of Pi_1 in MDF (eps-file) (jpg-file)

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