AtlasPublicTopicHeader.png

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

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%


Major updates:
-- DanielVentura - 08 Jul 2009

Responsible: DanielVentura
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf ATHENA_longitud_evt.pdf r1 manage 351.8 K 2009-07-08 - 13:15 DanielVentura Figure 5
PDFpdf ATLANTIS_MuSys_Calo_decay.pdf r1 manage 877.2 K 2009-07-08 - 13:15 DanielVentura Figure 4
PDFpdf ATLANTIS_eventID.pdf r1 manage 468.3 K 2009-07-08 - 13:16 DanielVentura Figure 7
PNGpng AcceptanceVsLifetime.png r1 manage 22.5 K 2009-07-08 - 12:31 DanielVentura Figure 26
PNGpng CalRatio_overlay.png r1 manage 612.8 K 2009-07-08 - 12:21 DanielVentura Figure 14
PNGpng DecayPositions_vs_Lifetime.png r1 manage 32.3 K 2009-07-08 - 12:12 DanielVentura Figure 3 (Left)
PNGpng Jet_E_distro.png r1 manage 30.5 K 2009-07-08 - 12:14 DanielVentura Figure 6
PNGpng Jet_E_distro_color_scale.png r1 manage 30.4 K 2009-07-08 - 12:17 DanielVentura Figure 11
PNGpng L2jet_nTracks.png r1 manage 12.8 K 2009-07-08 - 12:23 DanielVentura Figure 16
PNGpng L2muon_triggers.png r1 manage 23.1 K 2009-07-08 - 12:14 DanielVentura Figure 8
PNGpng LogCalRatio.png r1 manage 15.0 K 2009-07-08 - 12:20 DanielVentura Figure 13
PNGpng LogCalRatio_nTracks.png r1 manage 11.4 K 2009-07-08 - 12:22 DanielVentura Figure 15
PNGpng Trackless_Jet_Muon_eff_IDonly.png r1 manage 12.5 K 2009-07-08 - 12:30 DanielVentura Figure 25
PNGpng ave_LogCalrRatio_vs_dist.png r1 manage 16.4 K 2009-07-08 - 12:18 DanielVentura Figure 12
PNGpng barrel_MS_vpi_delta_t.png r1 manage 16.0 K 2009-07-08 - 12:24 DanielVentura Figure 18 (Left)
PNGpng barrel_cluster_trig.png r1 manage 13.8 K 2009-07-08 - 12:28 DanielVentura Figure 23 (Left)
PNGpng barrel_hvjet_trig.png r1 manage 13.6 K 2009-07-08 - 12:29 DanielVentura Figure 24 (Left)
PNGpng calo_delta_t_distribution.png r1 manage 17.5 K 2009-07-08 - 12:26 DanielVentura Figure 21
PNGpng deltaT_HCal.png r1 manage 19.4 K 2009-07-08 - 12:26 DanielVentura Figure 22
PNGpng deltaT_muonSpectrometer.png r1 manage 20.5 K 2009-07-08 - 12:25 DanielVentura Figure 20
PNGpng endcap_MS_vpi_delta_t.png r1 manage 17.8 K 2009-07-08 - 12:24 DanielVentura Figure 18 (Right)
PNGpng endcap_cluster_trig.png r1 manage 13.5 K 2009-07-08 - 12:28 DanielVentura Figure 23 (Right)
PNGpng endcap_hvjet_trig.png r1 manage 13.0 K 2009-07-08 - 12:30 DanielVentura Figure 24 (Right)
PNGpng gg_vpion_integral_beta.png r1 manage 32.2 K 2009-07-08 - 12:12 DanielVentura Figure 3 (Right)
PNGpng nRoI_in_cluster.png r1 manage 13.1 K 2009-07-08 - 12:17 DanielVentura Figure 10
PNGpng nRoI_vs_dist.png r1 manage 14.7 K 2009-07-08 - 12:15 DanielVentura Figure 9
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2012-03-19 - HenriBachacou
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Atlas All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback