TOF Third Level Trigger
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Pablo Yepes, Rice University
February 14, 1995
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Summary of present 3rd level trigger ideas for TOF. This list does not pretend
to be a complete, since this topic is under investigation at present.
Even if L3 is not supposed to combined information from different detectors,
the TOF and TPC will be an exception. The present ideas indicate that the
TOF information will be sent to the cpu's working on the TPC pattern
recognition. Those machines will also combine TPC and TOF. The time
required to perform this operation is only a small fraction of the
cpu time needed for tracking.
L3 Trigger Options
- Strangeness Trigger
- Description:
Measures strangeness production through the ratio K/pi
- Alternate Trigger: TPC+SVT dE/dx in case it is available at
L3, may provide a similar trigger but with lower resolution.
- Baryochemical Potential Trigger
- Description: measures stopping and baryochemical
potential via p/pbar ratio
- Alternate Trigger: dE/dx from SVT+TPC with lower
PID efficiency.
- Minijet Trigger
- Description: measures the minijet production via
high pt protons. It has been shown that the study
antiproton/proton production at high pt provides
a powerful insight into energy loss by jets in
a hot hadronic media.
- Alternate Trigger: Unknown.
- Charm Enhancement Trigger
- Description: D mesons tend to decay in high momentum
Kaons. The D meson
content of the sample is enriched by selecting
events with high momentum K.
- Alternate Trigger: Unknown.
- Abnormal Temperature Trigger
- Description: Measure the pt slope for different species.
Abnormal differences between different species may be
an indication of phase transition.
- Alternate Trigger: The temperature for all particles
and for protons can be obtained with only dE/dx PID.
- High pt HBT Trigger
- Description: Select pairs of kaons or protons with
low momentum difference and high pt. This will
increase the statistics for high pt interferometry
with kaons and protons.
- Alternate Trigger: Unknown.