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To understand how well we can study various physics objectives
at the ILC, it is necessary to understand the backgrounds one might
expect there, both those due to other competing physics processes--
(e.g., for a signal of ZH into MuMubb, possible physics ackgrounds
include WWbb, Zbb, etc.) as well as non-Physics backgrounds (e.g.,
from Gamma-Gamma interactions, e-gamma interactions, beam-gas
interactions, particles from upstreams, etc.)
(1) Background to a Physics Process--example ZH into MuMubb
For each Physics process we want to study, we need to worry about
possible backgrounds that will wash out the signal. These could
(1) Signal events that are mismeasured (for example, for ZH into MuMubb, if we make a 10% error in the determination of the momentum of one of the muons, the recoil mass would show up as perhaps 5-10% away from the correct position, and thus events on the peak would be smeared into the background.
(2) Other ee physics signals that can mimic the interested physics process--such as WWbb, Zbb, Zjj (with j mistaged as b), etc.
(3) non-ee events, such as gamma-gamma, e-gamma, etc.
(2) Background Environment that will deteriorate detector performance-- such as the TPC
Another perhaps more serious concern are the rate of particles that could flood the detector, whether from physics (ee, gamma-gamma, e-gamma), upstreams particles (from beam-gas, beam-pipe, focusing problems, etc.). If these rates are high enough, it is possible that certain types of detector will not work well enough. So, these needed to be understood.[an error occurred while processing this directive]