[G14_run] Comparisons of reconstructed vertex distributions

[Tsuneo Kageya]

Hi,

  as I was requested to show reconstructed z vertex distributions for 
Linear and Empty data, I am attaching a pdf file

for this purpose.

(1) The distributions are from pi- P data after all cuts for a final W 
bin of 1.9 < fW < 1.98 GeV (all theta angles).

(2) (a) - (d) are from 4 sets of data (D+ PERP, D+ PARA, D- PERP and D- 
PARA).

      (e) is from Empty target run a (Torus polarity is the same as (a) 
- (d)).

      (f) show comparisons between (a) and (e).

(3) As can see from (f),  at the 3rd peak from the left (z = ~ 1cm, 
downstream Kelf window), both widths are close.

(4) During the linear runs, the widths of the 3rd peak are close.

(5) The peak heights of the 1st peak (z = ~ -11 cm, entrance window of 
the target cell) are different between

Empty a and Linear runs, because the target cells are different.

     Regards, Tsuneo Kageya.

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