ExoticsHiddenValleyLLNPResults
Introduction
This page shows ATLAS Hidden Valley Long-Lived Neutral Particle studies described in the following public note:
ATL-PHYS-PUB-2009-082
.
Figures
All figure numbers refer to their numbering within the ATL-PHYS-PUB-2009-082 note.
Detector Signatures
Figure 3 (Left): π
v decay probability in Inner Detector Calorimeters and Muon Spectrometer
Figure 3 (Right): fraction of π
v that have β
πv less than the abscissa value
Figure 4: ATLANTIS Display of reconstructed event properties for two π
v decays: A in the barrel muon spectrometer and B in the hadronic calorimeter
Figure 5: ATLANTIS Display of a π
v decay in the barrel muon spectrometer
Figure6: Lego plot of the enerty deposition in the calorimeter cells around the jet axis (0,0) for π
v's decaying in the HCal
Figure 7: ATLANTIS display of the reconstructed event properties for two π
v decays in the TRT, where only Silicon hits inside the
RoI are shown.
Efficiency of Current ATLAS triggers
Figure 8: Fraction of muon
RoIs found at L1 and after applying muFast and muComb
New Trigger Objects (Decays in the Muon Spectrometer)
Figure 9: Average number of L1 muon
RoIs vs π
v decay distance
Figure 10: Number of L1 muon
RoIs contained in a cone of ΔR=0.4 in events that pass the L1_3MU6 trigger
New Trigger Objects (Decays in the Calorimeters)
Figure 11: Energy distribution for jets that originate from π
v's that decay inside of the barrel HCal where (0,0) is the jet axis
Figure 12: Mean value of log
10(E
HAD/E
EM) for all jets coming from π
v decays as a function of the π
v decay position in the barrel HCal
Figure 13: Distribution of log
10(E
HAD/E
EM) for all jets in events that pass the L1_TAU40 trigger
Figure 14: log
10(E
HAD/E
EM) for all jets coming from π
v decays as a function of the π
v decay position in the barrel HCal and the projection showing the second peak from decays in the HCal
Figure 15: Nubmer of tracks reconstructed by the L2 tracking algorithm
SiTrack, using a track p
T cut of 1
GeV for jets with log
10(E
HAD/E
EM) > 1
New Trigger Objects (Decays in the Inner Detector)
Figure 16: Number of reconstructed tracks (p
T > 1
GeV) associated with each L2 jet using the
SiTrack algorithm in a (Δη x Δφ) region of (0.2 x 0.2) around the jet axis
Trigger Timing Issues (Muon RoI Cluster Trigger)
Figure 18 (Left): Distribution of Δt shifts for π
v's that decay in the barrel Muon Spectrometer
Figure 18 (Right): Distribution of Δt shifts for π
v's that decay in the endcap Muon Spectrometer
Figure 20: Fraction of π
v's with a Δt shift < 6 ns as a function of the π
v mass
Trigger Timing Issues (Calorimeter Energy Ratio Trigger)
Figure 21: Δt distriubtion for π
v's that decay in the HCal for m
h=140
GeV and m
πv=40
GeV
Figure 22: Fraction of π
v's that decay in the HCal with a Δt shift < 3ns as a function of the π
v mass
Dependence of Trigger Efficiencies on the πv Decay Length
Figure 23 (Left): Efficiency of the muon
RoI cluster trigger as a function of the π
v decay position for decays in the barrel
Figure 23 (Right): Efficiency of the muon
RoI cluster trigger as a function of the π
v decay position for decays in the endcap
Figure 24 (Left): Efficiency for the log
10(E
HAD/E
EM) trigger as a function of the π
v decay position for decays in the barrel
Figure 24 (Right): Efficiency for the log
10(E
HAD/E
EM) trigger as a function of the π
v decay position for decays in the endcap
Figure 25: Efficiency for the Trackless Jet + muon trigger as a function of the π
v decay position for decays in the barrel region
Figure 26: h->π
vπ
v events accepted by our long-lived particle triggers vs the π
v lifetime for m
h=140
GeV and m
πv=40
GeV. Left axis: fraction of events accepted. Right axis: number of events for an integrated luminosity of 100 pb
-1 assuming Br(h->π
vπ
v)=100%
Major updates:
--
DanielVentura - 08 Jul 2009
Responsible:
DanielVentura
Last reviewed by:
Never reviewed