Systematic reconstruction biases

sc_mass:mc_shift

As a check on the $\lc \pion^\pm$ reconstruction code, we use Monte Carlo to look for a systematic difference between generated and reconstructed quantities. This study suggests that there is a discrepancy of about 0.1 between the generated and reconstructed $\sigc-\lc$ mass differences. There is no evidence for a systematic shift in the $\scd-\scz$mass difference. sc_mass:mc_lim_shift shows the reconstructed mass difference distributions for generated $\lcpi$ decays. The input and recovered values are summarized in sc_mass:mc_shift.

 

Figure 6.8: Reconstructed Monte Carlo distributions for generated and . Input and reconstructed parameters are listed.

sc_mass:mc_lim_shift

sc_mass:mc_shift 

Table 6.4: Differences between generated and reconstructed parameters in $\lc\pion^\pm$ and those reconstructed by the analysis and fitting programs. Mass differences have units of .

Quantity	Generated	Reconstructed	Difference
	167.54	$167.44 \pm 0.02$	$0.10 \pm 0.02$
	167.59	$167.51 \pm 0.02$	$0.08 \pm 0.02$
	0.05	$0.07 \pm 0.03$	$-0.02 \pm 0.03$

At this time, an accurate simulation of does not exist, so we are unable to make a similar check on the .