Analysis of IC86 2011 High Energy Contained Cascade Events Mariola Lesiak-­‐Bzdak Stony Brook Univ. IceCube CollaboraGon MeeGng 6-­‐11 May, 2013, Wisconsin Madison 1 IntroducGon •  MoGvaGon –  Search for astrophysical E-­‐2 neutrino-­‐induced cascades •  Idea –  Apply IC79 high energy contained cascade events selecGon to IC86 2011 as both configuraGons very similar –  Cut values need to be opGmized (CscdL3 cuts are not the same) •  StarGng point for this analysis: IC86 2011 CscdL3 single contained events hSps://wiki.icecube.wisc.edu/index.php/
L3_cuts_for_IC86_2011_Cascade_channel Data and SimulaGon •  Data: –  burn sample – 10% of data (runs ending with zero) pub::/data/ana/Cscd/level3/exp/i3links/burn •  Corsika simulaGon (at CscdL3): –  5C corsika E-­‐2 dataset 9255 (100 TeV < EPrim < 100 EeV) pub::/data/ana/Cscd/level3/sim/9255 •  Nugen simulaGon (at CscdL3): –  NuE E-­‐2 dataset 9250 pub::/data/ana/Cscd/level3/sim/9250 –  NuMu E-­‐2 dataset 9095 pub::/data/ana/Cscd/level3/sim/
9095 Reminder: Cascade L3 IC86 2011 TopologicalSplitter Module
TopologicalSplits%==1
& Contained Events$
FillRaGo(from L2)>0.6 Nstring>2 0<reduced_Llh*<9 Singles contained TopologicalSplits==1
& Uncontained Events^
FillRaGo(from L2)>0.6 NCh > 120 Singles uncontained TopoSplits==2
& Contained Events#
Nstring>3 0<reduced_Llh_1<9. OR 0<reduced_Llh_2<9. Coincidences contained %TopologicalSplits = number of sub-­‐events found by Topological SpliSer module $Veto_earliestLayer<=4 & Veto_depthFirstHit>-­‐430. & Veto_depthFirstHit<430. ^Veto_earliestLayer==5 || Veto_depthFirstHit<=-­‐430. || Veto_depthFirstHit>=430. #(Veto_earliestLayer_1<=4 & Veto_depthFirstHit_1>-­‐430. & Veto_depthFirstHit_1<430.) || (Veto_earliestLayer_2<=4 & Veto_depthFirstHit_2>-­‐430. & Veto_depthFirstHit_2<430.) *reduced_Llh = reduced Llh(CascadeLlhVertexFit for HLC pulses only without DeepCore) 4 Reminder: Cascade L3 IC86 2011 TopologicalSplitter Module
TopologicalSplits%==1
& Contained Events$
FillRaGo(from L2)>0.6 Nstring>2 0<reduced_Llh*<9 Singles contained This Analysis: Single Contained Events TopologicalSplits==1
& Uncontained Events^
FillRaGo(from L2)>0.6 NCh > 120 Singles uncontained TopoSplits==2
& Contained Events#
Nstring>3 0<reduced_Llh_1<9. OR 0<reduced_Llh_2<9. Coincidences contained 5 Level4 Cuts •  Number of Topological Splits < 2 (output of TopologicalTrigger module by Dima/Chris Weaver) -­‐ removes visible coincident muon events hSp://wiki.icecube.wisc.edu/index.php/Coincident_Corsika_Events_Removal •  Nstring >= 4 •  TimeSplitPosi=on < 40 m –  IC79 L3 cascade filter: Each event split into halves based on the charge-­‐weighted mean Gme and CscdLlh run on each half separately –  Time Split Posi=on=difference between reconstructed vertex posiGons for both halves •  log10(L3_Credo_Energy) > 4.0 (Energy > 10 TeV) Details on Level4 cuts optimization:
http://wiki.icecube.wisc.edu/index.php/IC79_L4_cuts_for_Cascade_Channel
4/24/13 Mariola Lesiak-­‐Bzdak (Stony Brook) 6 Credo Energy at L3 Time Split PosiGon at L3 IC86 2011 Rates for Single Contained Events L3 [μHz] L4 [μHz] L4/L3 (Reduc=on) Data 163493 140.04 0.08% 5C Cors (Polyg) 5C Cors (H4a) 104200 136800 54.19 65.34 0.05% Atm. νe (Honda) 55.56 0.54 0.1% () Atm. νμ (Honda) 266.5 1.52 0.06% () Astr. νe (10-­‐8 x E-­‐2) 0.853 0.33 39% (2.5) 3.8 0.10 2.6% () Astr. νμ (10-­‐8 x E-­‐2) Appying further cut cut out all corsika (30,000 files generated) – need more staGsGcs 9 Credo Vertex PosiGon Z at L3 log10(CredoEnergy/Qtot) at L3 Summary •  Search for high energy (>30 TeV) astrophysical neutrino-­‐induced cascades with IC86 2011 •  Use cut opGmized for IC79 high energy cascade analysis •  Need more Monte Carlo staGsGcs BACKUP SLIDES Primary energy At L3 Aqer cut on Credo_Enrgy > 10 TeV I3VetoModule (wriSen by Eike, developed by Lukas) •  Veto module loops over the pulsemap and esGmates how much given event is "contained” in the detector volume •  Containment definiGon at L3 IC86 2011: xy layers 0 1 2 3 4 5 •  Veto_earliestLayer<=4 •  -­‐430.<Veto_depthFirstHit
<430 Where we use SRTOfflinePulses for Singles and OfflinePulsesHLC for Coincident events 15