[Clascomment] OPT-IN: Measurement of the Spin and Parity of the Lambda(1405)

[Elton Smith]

Comments to Measurement of the Spin and Parity of the Lambda(1405)

Great paper, very readable with a nice result.

Abstract: Suggest : A determination -> A measurement

9: The Lambda(1405) IS a peculiar state….

22: …difficult in identifying the mass -> difficulty in classifying?

105: …Y*->Y pi, the parity can be found by measuring Q, which determines L.

Figure 2 a) The contribution to the Y*(1670) is almost invisible, which becomes a little confusing since the Lambda(1405) is of essentially the same color. You might be able to fill in the Y* histogram with a light color (e.g. yellow), which would make it visible. It would also make the histogram consistent with other contributions.

Paragraph 211-230. You might want to give the Chi2 values for various fits (see below).

Summary and conclusion: 283-299:
The first sentence (spin parity is most consistent with 1/2-) is rather tepid and I think the data can allow a more forceful conclusion. You might be able to make a more quantitative statement regarding the preference of the data for the 1/2- assignment if you give the Chi2 values for various hypotheses in paragraph 211-230. From the Chi2 one can derive a probability for each hypothesis. In other words, it would be nice to conclude with something like: The probability for the 1/2- assignment is great than … times the probability than other alternatives considered (1/2-, 3/2+-).