Physics

1
Physics Offline Status
Now
2007

• Ginés MARTINEZ
• Subatech, Nantes
• Workshop on Dimuon Physics in ion-ion collisions
  at LHC
• (3-8 june 2004)
• Berg-en-Dai Kruger Park, South Africa

2
Physics

• Study of the Quark Gluon Plasma formed in heavy
  ion collisions at LHC energies via muon
  production.
• Observables
• Quarkonia production J/Psi, Psi', Upsilon family
  via their muon decay (5, 1, 2 BR)
• Open Charm and beauty D-0, D, D-s and B-0,
  B0s B-c via their semi-muonic decay (12 15
  BR)
• Vector mesons r, w, f.
• Collision Topology
• Up to 10 centrality classes or (low statistics)
  0-10 and 50-70 and 70-90
• Ligher systems CaCa, pPb and pp
• Respect to the reaction plane v2, v4 ...

3
Quarkonia

• Invariant Mass Analysis
• Separation of the Upsilon resonances (slt100 MeV)
• Combinatorial and correlated background
  substraction.
• Forward rapidity range 2.4-4
• Full transverse momenta range, from pT0
• Measurement of bottonium
• Recombination versus Debye screening _at_ LHC

4
Open Heavy Flavors

• PT distribution of single muons.
• Correlation of muon pairs like and unlike sign.
• Correlation of 3 or more muons.
• Intermediate rapidity region
• Correlation muon(forward)-electron(central).
• Correlation muon(forward)-kaon(central) (to be
  studied).
• Mesure explicite, i.e. B gt J/Y K (to be
  studied).
• More to come if more PhD thesis in near future.

5
Correlated Background
M
mj
Q
Q
mi
M
6
Off-line Goals

• Raw data analysis of the muon spectrometer of
  ALICE to obtain experimental results to be
  published withih the shortest delay after the LHC
  runs.
• On-line control of the spectrometer
• Calibration of the spectrometer
• Alignment of the tracking chambers
• Stockage I/O, DataBase ...
• Pre-analysis of rawdata
• Physics analysis
• Tutorial and documentation

7
Core Off-line Team
8
Modules of Offline
9
AliRoot
Générateurs
Per module
ISAJET
AliRoot
I/O
HIJING
STEER
Pre-Ana, ...
EVGEN
Pythia6
Pre-ana
AliEn
Geant3
Response
Simulation
Fluka
Geometry
Geant4
ROOT

Virtual MC
10
Framework
11
Off-line architecture
Vertex Central Barrel ZDC ...
HLT
ALICE Experiment
Mapping Calibration
PWG Analysis
Storaged MUON Data (I/O)
RawData
Kinematics
SDigits
AOD
ESD
Digits
RecPoints
Tracks
TrackRef
Hits
Physics Generators
ESD Tracks in ALICE
Merging Noise ...
Reconstruction Clusterisation, Trigger, Tracking
MonteCarlo
Response function
ESD Analysis
Sdigits Central HIJING Real Data
Bgk data
Alignment
Geometry
12
Outlook

• MonteCarlo and Response Function
• Geometry Alignment
• Reconstruction Event Data Summary
• I/O
• DAQ RawData HLT Mapping Calibration
• ESD analysis
• PDC04
• Physics Generators

13
Response function

• Realistic simulation of the CPC efficiency due to
  non-gaussian tail (2) from SPS data (to do list
  and nobody here).
• Effect of the magnetic field on the reponse
  function pad mutiplicity, spatial shift, ...
  (nobody here).

14
Geometry

• Unique definition of the MUON geometry.
• Envelop method from Ivana Hrivnacova.
• Global Interface for MUON Geometry.
• 3D positionning of chambers.
• Aligment with physics (in the to do list).
• Geometry in/for segmentation reconstruction
  (to do list).
• More in Eric's presentation.

Ph.D E.Dumonteil 2007
15
Reconstruction ESD

• Updating the new clusterizer algorithm (better
  invariant mass resolution at background level 2)
• Updating the Kalman filter for tracking .
• In the to do list and to be done by Alexander
  Zinchenko during his 6 month stay _at_ Subatech end
  of this year.
• More about reconstruction and ESD in Christian's
  presentation and about trigger in Philippe's
  presentations.

16
I/O and MUON Data

• New I/O ready
• galice.root (smal size) conected to
  Kinematics.root, TrackRef.root,
  MUON.Hits.root, MUONS.SDigits.root,
  MUON.Digits.root, MUON.RecPoints.root,
  MUON.Track.root, AliESD.root
• New Sdigit level for merging.
• MUON data structure slightly modified and managed
  by the class AliMUONData and AliMUONDataInterface.
  
• New data link to come soon (in the to do list,
  Artur and Bruce workingon this subject)

17
RAWDATA Calibration Mapping HLT

• MUON rawdata format to be defined (Alicenote).
  Generation of rawdata from Digits for HLT
  developments (to do list and in delay).
• Mapping framework to be developped. Clever
  mapping modularity sectors, PCB, slats,
  trigger chambers, buses, cathodes, chambers,
  stations etc ... Important for calibration,
  channel disable, mapping evolution, etc ... No
  body here.
• Interface with HLT to be developped.
• Starting to think about calibrating one million
  of channels.

18
Physics Data Challenge 04

• Producing a huge amount of simulated data with
  AliRoot (jan-jun 2004) in 3 phases 20000 central
  event for embedding, peripheral events,
  simulation of physics signals
• AliEn as base for remote production. AliEn has
  been interfaced with LCG .
• PDC04 underprogress. Around 20000 central HIJING
  events have been simulated (for MUON trigger
  studies). 2nd phase finished (yesterday's party).
• Analysis of data using AliEn as client. An
  engineer from Subatech working on this
  (Jean-Michel). Nantes farm is in the production
  phase as AliEn serveur.

19
MUON signals in PDC04

• New ConfigPPR.C file in macro directory with
  MUON options
• "kMuonCocktailCent1" Ncoll1626, Npart359,
• "kMuonCocktailPer1", Ncoll820, Npart229,
• "kMuonCocktailPer4", Ncoll13.6, Npart13.3,
• "kMuonCocktailCent1HighPt",
• "kMuonCocktailPer1HighPt",
• "kMuonCocktailPer4HighPt",
• "kMuonCocktailCent1Single",
• "kMuonCocktailPer1Single",
• "kMuonCocktailPer4Single"

Cent1 0-10 central, Per1 20-40, Peri4
70-90 LowPt cut 0.8 GeV/c High Pt cut 2.5
GeV/c Single 1 muon in the MUON
acceptance Genertor is AliMUONCocktail (muon from
open charm, beauty, quarkonia and hadrons
20
Cocktail Generator
case kMuonCocktailCent1 comment
comment.Append(" Muon Cocktail Cent1") AliGenMUO
NCocktail gener new AliGenMUONCocktail() gen
er-gtSetPtRange(1.0,100.) // Transverse
momentum range gener-gtSetPhiRange(0.,360.)
// Azimuthal angle range gener-gtSetYRange(-4.0
,-2.4) gener-gtSetMuonPtCut(0.8) gener-gtSetMuon
ThetaCut(171.,178.) gener-gtSetMuonMultiplicity(2
) gener-gtSetNumberOfCollisions(1626.)
//Centrality class Cent1 for PDC04 gener-gtSetNumb
erOfParticipants(359.4)//Centrality class Cent1
for PDC04 gGenergener break
21
MUON cocktail production

• Per4 70-90 CC PbPb (ltNpartgt 13.3,
  ltNcollgt13.6)
• 1 PbPb year is 8.108 PbPb Per4 collisions
• 0.6 of hard processes (assuming Ncoll scaling)
• 70000 simulated events with the AliMUONCocktail
  represent the full statistics
• Cent1 0-10 CC PbPb (ltNpartgt 359, ltNcollgt1626)
• PbPb year is 4.108 PbPb Cent1 collisions
• 40.6 of hard processes
• Needed 8.107 simulated events with
  AliMUONCocktail 20000 jobs, 5 year CPU, 20
  Tbytes
• 5 of this in the Nantes farm (1000 jobs, 93 days
  of CPU, 1 TBytes).

22
Combinatorial Background
Pt 1D spectra and q versus j 2D spectra for mm-
m
m-
From random pT 1D and q-j 2D histograms
MUONQuarkoniaPtDistri.C macrom forMUONmassPlot
analysis
23
Per4 production
NJ/Psi 2475-922 (expected 3000) NG39-12
(expected 38) NG'11-5 (expected 6)
24
Per4 J/Psi InvMass vs pT
25
Per4 Inv Mass subtracted
26
J/Psi peak
J/Psi full fit 3.137-0.002 GeV 56-2 MeV
27
Per4 Upsilon Peak
Upsilon full fit 9.511-0.022 GeV 103-32 MeV
28
Per4 Pt Distribution
29
Cen1 production
NJ/Psi 7408-2876 (expected 12600) NG201-56
(expected 162) NG''165-40 (expected 25)
30
Cen1 J/Psi Inv Mass
31
Cen1 J/Psi Inv Mass Sub
32
Cen1 J/Psi Peak
J/Psi full fit 3.139-0.003 GeV 50-3 MeV
33
Cen1 Upsilon Peak
Upsilon full fit 9.567-0.014 GeV 125-14 MeV
34
Cen1 J/Psi Pt Distribution
35
Cen1 Upsilon Pt Distri
36
Conclusions
Vertex Central Barrel ZDC ...
HLT
ALICE Experiment
Mapping Calibration
PWG
Storaged MUON Data (I/O)
RawData
Kinematics
SDigits
AOD
ESD
Digits
RecPoints
Tracks
TrackRef
Hits
Physics Generators
ESD Tracks in ALICE
Merging Noise ...
Reconstruction Clusterisation, Trigger, Tracking
MonteCarlo
Response function
ESD Analysis
Sdigits Central HIJING Real Data
Bgk data
Alignment
Geometry
37
Working groups

• GWG Geometry in/for segmentation reconstruction
• RWG RawData structure v0 for MUON and generation
  of RawData from Digits for HLT studies.
• MFWG Framework for mapping.