Cosmic Rays in ALICE SPD TRIGGER – Analysis runs with B=ON – Some simulations ACORDE TRIGGER...
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Cosmic Rays in ALICE
• SPD TRIGGER– Analysis runs with B=ON – Some simulations
• ACORDE TRIGGER– New algorithm for cosmic muons– Analysis run with B=ON
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SPD TRIGGER RUN : 60824
RUN without magnetic field
Good tracking in TPC
Lot of TPC clusters
141 tracks
Iron interaction
Mu Photonuclear intercation ???
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SPD TRIGGER RUN : 60824
RUN without magnetic field
Good tracking in TPC
Lot of TPC clusters
707 tracks
Iron interaction
Mu Photonuclear intercation ???
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Cosmic events with SPD trigger without magnetic field
• Analysis of high multiplicity events • Run :
– 60281 8h 6m 9 events > 6 tracks– 60305 2h 02m 3 events > 6 tracks– 60824 8h 12m 210 events > 6 tracks and 20 events > 20 tracks SPD trigger 7-8 events per minute
We can estimate at least 1 event per hour with high multiplicity Probably muon intercation in iron
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SPD TRIGGER with B=ON
• RUN 62107 night 8h 36min • RUN 62102 evening 5h 25min• RUN 62084 afternoon 4h 41min• RUN 62029 evening 2h 53min• RUN 62006 afternoon 2h 41min• RUN 62022 evening 1h 06min
– October 7/9 2008
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SPD TRIGGER : high multiplicity events
• RUN 62107 – 7 events with Ntracks>18
• 2 + (1) events interaction in iron• 1 probable interaction in ITS• 3 bad events
• RUN 62102– 3 events with Ntracks>18
• 2 bad events• 1 no display
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Mu interacting where ?
RUN = 62107
Chunk = 90
Event = 868
Tracks = 19
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Mu interacting in iron
RUN = 62107
Chunk = 70
Event = 87
Tracks = 23
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Mu interacting in iron
RUN = 62107
Chunk = 180
Event = 4325
Tracks = 27
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Previous event 4325
MUONP = 138 GeV
MUONP = 183 GeV
27 tracks
9 particles
2 missing
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Simulations of muon interaction in iron
• Muon in the range 700-1000 GeV• Starting at Y=800 cm (above the magnet)• Geant• Fluka• Only few event now (< 100)
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High energy muon interacting in iron
Muon -
Pmu=930 GeV
Yint=573 cm
Mu e+ e-
Pe+=25 GeVPe-=37 GeV
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Previous event seen by TPC
Interaction point
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Previous event : TPC recostruction
Tracks = 60
2 tracks for theprimary muon:
Pmu=396 GeV
Pmu=306 GeV
Instead of
Pmu = 865 GeV ????
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SPD TRIGGER with B=ON
• Few events with muon interactions in iron with respect the expectation with B=OFF
• Probably all events are e+ e- pair production created by muon with Emu > 500 GeV
• It should be necessary a long run with B=ON (1 day) with good data and reconstruction in TPC.
• Next step : Forced Geant or Fluka to create events with muon nuclear photoproduction interaction in iron
• Give an expectation of these events• Give topology of these events for a possible TOF Trigger
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ACORDE Trigger Analysis
File:/Volumes/MRC/RunsAliEn/Run62107/08000062107000.460/AliESDs.root, N. of Event:8560, ACORDE Multiplicity:35, No. of ESD's tracks:148
How many muonswe have ?
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Float_t fCutMaxD=5;Float_t fCutMaxDz=40;Float_t fCutTheta=0.03;Float_t fCutMinDir=-0.99;Float_t kMaxD=1000;
Double_t *p0 = tr0->GetParameter();Double_t *p1 = tr1->GetParameter();
if (TMath::Abs(p0[3]+p1[3])>fCutTheta) return kFALSE;if (TMath::Abs(p0[1]-p1[1])>fCutMaxDz) return kFALSE;if (TMath::Abs(p0[0]+p1[0])>fCutMaxD) return kFALSE; Double_t d0[3], d1[3];tr0->GetDirection(d0); tr1->GetDirection(d1); if (d0[0]*d1[0] + d0[1]*d1[1] + d0[2]*d1[2] >fCutMinDir) return kFALSE;
Float_t minDist=1000;
// calculate distanceFloat_t dy = (tr0->GetY()+tr1->GetY());Float_t sy2 = tr0->GetSigmaY2()+tr1->GetSigmaY2();Float_t dphi = (tr0->GetAlpha()-tr1->GetAlpha()-TMath::Pi());Float_t sphi2 = tr0->GetSigmaSnp2()+tr1->GetSigmaSnp2();Float_t dtheta = (tr0->GetTgl()-tr1->GetTgl());Float_t stheta2 = tr0->GetSigmaTgl2()+tr1->GetSigmaTgl2();Float_t normDist = TMath::Sqrt(dy*dy/sy2+dphi*dphi/sphi2+dtheta*dtheta/stheta2);if (normDist>minDist) return kFALSE;
return kTRUE;
Bool_t IsPair(AliExternalTrackParam *tr0, AliExternalTrackParam *tr1) IsPair?
Cuts defined by TPC people in TPC’s cosmic calibration
Get the params of both tracks
If both tracks are out of the cuts we don’t have a cosmic muon
Get the direction of both tracks. If they are not in the same direction both belongs to some other kind of event
Calculate the distance between both tracks. If it is bigger than 10 cms. Both tracks don’t belong to the same track
If both tracks “pass” the previous filter then we have a COSMIC MUON TRACK !!!!
Algorithm to match the tracks and get muons
Mario Rodriguez
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Number of Event: 18, Number of Tracks: 3, Number of Muons: 0
Delta Ray?
Test on algorithmNew Algorithm based on the classes :AliTPCcalibCosmic.cxx and AliESDCosmic.cxx by Marian Ivanov
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Trigger: D0ASL , Number of Event: 1341, Number of Tracks: 2, Number of Muons: 1, Number of ACORDE fired Modules:1
Very beautiful Single Muon Event triggered by ACORDE
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Trigger: D0LSR , Number of Event: 14855, Number of Tracks: 79, Number of Muons: 0, Number of ACORDE fired Modules:0
Also with another trigger we are counting very well !!!
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Trigger: D0ASL , Number of Event: 716, Number of Tracks: 58, Number of Muons: 3, Number of ACORDE fired Modules:1
But, CAUTION, even though here we have an event from laser trigger of TPC calibration, the trigger cluster is from ACORDE!!!
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N. TPC tracks vs ACORDE modules
RUN 62107
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RUN 62107, MAGNETIC FIELD ONStart Time:09/10/2008 00:03:37End Time:09/10/2008 08:39:39Duration:Days: 0Hours: 8Minutes: 36Seconds: 2
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Summary ACORDE
• New software to match tracks to get exact number of muons under construction and test
• Study of the runs with B=ON– Muon Multiplicity, Energy distribution, Arrival
Direction (Teta, Phi)Presentation at next Physics Forum
• Hardware 15 modules equipped with new photubes (in these days)