User name Templon
Log entry time 04:19:20 on June 3,2000
Entry number 42926
keyword=reals vs. PID cutsSome worry has been expressed whether PID cut is really cutting PID.
Plots below explore this. Top plot: shows corrected time. Black histogram:
cut on protons in beta vs. mean ADC. Red histogram: cut on what we
believe are pions.
.
Bottom plot: same, except includes cut on reaction-vertex two-arm
difference. Interesting that a peak appears in the pion-ID spectrum near
channel 160. Plausible if we believe that (see log entry 42834) earlier
kinematics had pion peak in corrected time. We are set for much
lower hadron momentum now, so while pion flight time would not
change much, proton flight time would.
.
To confirm would need to know a) if trigger timing changed (otherwise
why would pions move and not protons) and b) which is the stop and
start for this corrected time.
FIGURE 1
