Difference: ExoticsHiddenValleyLLNPResults (1 vs. 4)

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Introduction

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This page shows the results from the ATLAS Hidden Valley Long-Lived Neutral Particle group.

Note

ATL-PHYS-PUB-2009-082
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This page shows ATLAS Hidden Valley Long-Lived Neutral Particle studies described in the following public note: ATL-PHYS-PUB-2009-082.
 

Figures

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ExoticsHiddenValleyLLNPResults

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  LogCalRatio_nTracks.png
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Figure 15: Nubmer of tracks reconstructed by the L2 tracking algorithm SiTrack, using a track pT cut of 1 GeV for jets with log10(EHAD/EEM) > 1
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Figure 15: Nubmer of tracks reconstructed by the L2 tracking algorithm SiTrack, using a track pT cut of 1 GeV for jets with log10(EHAD/EEM) > 1
 

New Trigger Objects (Decays in the Inner Detector)

L2jet_nTracks.png

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Figure 16: Number of reconstructed tracks (pT > 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
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Figure 16: Number of reconstructed tracks (pT > 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)

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ExoticsHiddenValleyLLNPResults

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ExoticsHiddenValleyLLNPResults

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Introduction

This page shows the results from the ATLAS Hidden Valley Long-Lived Neutral Particle group.

Note

ATL-PHYS-PUB-2009-082

Figures

All figure numbers refer to their numbering within the ATL-PHYS-PUB-2009-082 note.

Detector Signatures

DecayPositions_vs_Lifetime.png

Figure 3 (Left): πv decay probability in Inner Detector Calorimeters and Muon Spectrometer

gg_vpion_integral_beta.png

Figure 3 (Right): fraction of πv that have βπv less than the abscissa value

ATLANTIS_MuSys_Calo_decay.pdf

Figure 4: ATLANTIS Display of reconstructed event properties for two πv decays: A in the barrel muon spectrometer and B in the hadronic calorimeter

ATHENA_longitud_evt.pdf

Figure 5: ATLANTIS Display of a πv decay in the barrel muon spectrometer

Jet_E_distro.png

Figure6: Lego plot of the enerty deposition in the calorimeter cells around the jet axis (0,0) for πv's decaying in the HCal

ATLANTIS_eventID.pdf

Figure 7: ATLANTIS display of the reconstructed event properties for two πv decays in the TRT, where only Silicon hits inside the RoI are shown.

Efficiency of Current ATLAS triggers

L2muon_triggers.png

Figure 8: Fraction of muon RoIs found at L1 and after applying muFast and muComb

New Trigger Objects (Decays in the Muon Spectrometer)

nRoI_vs_dist.png

Figure 9: Average number of L1 muon RoIs vs πv decay distance

nRoI_in_cluster.png

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)

Jet_E_distro_color_scale.png

Figure 11: Energy distribution for jets that originate from πv's that decay inside of the barrel HCal where (0,0) is the jet axis

ave_LogCalrRatio_vs_dist.png

Figure 12: Mean value of log10(EHAD/EEM) for all jets coming from πv decays as a function of the πv decay position in the barrel HCal

LogCalRatio.png

Figure 13: Distribution of log10(EHAD/EEM) for all jets in events that pass the L1_TAU40 trigger

CalRatio_overlay.png

Figure 14: log10(EHAD/EEM) for all jets coming from πv decays as a function of the πv decay position in the barrel HCal and the projection showing the second peak from decays in the HCal

LogCalRatio_nTracks.png

Figure 15: Nubmer of tracks reconstructed by the L2 tracking algorithm SiTrack, using a track pT cut of 1 GeV for jets with log10(EHAD/EEM) > 1

New Trigger Objects (Decays in the Inner Detector)

L2jet_nTracks.png

Figure 16: Number of reconstructed tracks (pT > 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)

barrel_MS_vpi_delta_t.png

Figure 18 (Left): Distribution of Δt shifts for πv's that decay in the barrel Muon Spectrometer

endcap_MS_vpi_delta_t.png

Figure 18 (Right): Distribution of Δt shifts for πv's that decay in the endcap Muon Spectrometer

deltaT_muonSpectrometer.png

Figure 20: Fraction of πv's with a Δt shift < 6 ns as a function of the πv mass

Trigger Timing Issues (Calorimeter Energy Ratio Trigger)

calo_delta_t_distribution.png

Figure 21: Δt distriubtion for πv's that decay in the HCal for mh=140 GeV and mπv=40 GeV

deltaT_HCal.png

Figure 22: Fraction of πv's that decay in the HCal with a Δt shift < 3ns as a function of the πv mass

Dependence of Trigger Efficiencies on the πv Decay Length

barrel_cluster_trig.png

Figure 23 (Left): Efficiency of the muon RoI cluster trigger as a function of the πv decay position for decays in the barrel

endcap_cluster_trig.png

Figure 23 (Right): Efficiency of the muon RoI cluster trigger as a function of the πv decay position for decays in the endcap

barrel_hvjet_trig.png

Figure 24 (Left): Efficiency for the log10(EHAD/EEM) trigger as a function of the πv decay position for decays in the barrel

endcap_hvjet_trig.png

Figure 24 (Right): Efficiency for the log10(EHAD/EEM) trigger as a function of the πv decay position for decays in the endcap

Trackless_Jet_Muon_eff_IDonly.png

Figure 25: Efficiency for the Trackless Jet + muon trigger as a function of the πv decay position for decays in the barrel region

AcceptanceVsLifetime.png

Figure 26: h->πvπv events accepted by our long-lived particle triggers vs the πv lifetime for mh=140 GeV and mπv=40 GeV. Left axis: fraction of events accepted. Right axis: number of events for an integrated luminosity of 100 pb-1 assuming Br(h->πvπv)=100%

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