Research: The Asymmetry

using the 124 runs, 60260331 events

The character of the runs I used in this research

• The electron beam energy : 1.645 [GeV]
• The photon energy : 0.329 - 1.563 [GeV]

The decay mode, gamma P -> P pi+ (pi-)

I made the plots of the missing mass in the mode, gamma P -> P pi+ (pi-) from the three kinds of targets: the butanol target, the carbon target, and the polyethylene target. I make the mass cut to select the missing mass, pi - from the scaled missing mass plot for the butanol target. The plot with the yellow background is made before applying the mass cut and the blue one is made after the mass cut. The following is the mass cut I used.

                   the mass cut, (0.015 - 0.035) [GeV^2]

The butanol target	The carbon target
The polyethylene target

I used the scaling factor, 5.992 to make the scaled plot for the butanol target.

The plot of the asymmetry

I made the plots in the four kinds of case of the beam and target polarization. These plots are the scaled plot in butanol. This means that these plots are made through the same way to make the scaled missing mass plot. That is,

                   (These plots) = (The asymmetry in butanol target) - (scaling factor)(the asymmetry in carbon target)

with beam -> target =>	with beam <- target <=
with beam -> target <=	with beam <- target =>

with the spin 3/2

with the spin 1/2

The asymmetry