I ran the efficiency vs. rejection program for energy resolution of
3%/sqrt(E) *and* 250 ps time resolution. The results are tabulated
below:
p* cut eff_sig eff_bkgd
------ ------- --------
0.1755 0.32898 0.018838
0.1760 0.33284 0.019485
0.1765 0.33616 0.020204
0.1770 0.34030 0.021139
0.1775 0.34402 0.022146
0.1780 0.34798 0.022793
0.1785 0.35251 0.024087
0.1790 0.35625 0.025237
0.1795 0.36005 0.026819
0.1800 0.36417 0.027898
0.1805 0.36816 0.029336
0.1810 0.37361 0.030917
0.1815 0.37799 0.032355
0.1820 0.38133 0.033937
0.1825 0.38562 0.035807
0.1830 0.38956 0.038036
0.1835 0.39459 0.040336
0.1840 0.40025 0.042565
0.1845 0.40481 0.044938
0.1850 0.40947 0.048246
and are plotted in:
ftp://cebafb.cebaf.gov/pub/marki/neutral/scan_kpi2_05.ps
p* is in GeV/c. Roughly speaking, a rejection factor of 50 for 33%
efficiency.
If you are curious, scan_kpi2_04.ps shows results for 3% energy
resolution and the old 100 ps nominal time resolution.
--
Mark M. Ito, Thomas Jefferson National Accelerator Facility
12000 Jefferson Ave., Mail Stop 12H, Newport News, VA 23606
Email: marki@cebaf.gov, Office: (757)249-7175, Pager: (757)680-7175