1. Runione AtlasItalia Milano 17/11/2009
J/Ψ ->μμ
reports sugli analysis walk-through
Runione AtlasItalia Milano 17/11/2009
Francesco Conventi
(per il gruppo di analisi J/Ψ)
J/psi -> mu mu Riunione AtlasItalia

2. EARLY-DATA ANALYSIS: J/Y IN DI-MUONS
The first LHC run period in is expected to deliver an integrated luminosity of the
order of 100 pb-1 with the following schedule:
first collisions during the first week of December with a CM energy of √s = 900GeV;
√s = 2.2 TeV untill the end of 2009;
√s = 7 TeV in 2010.
Given the Standard Model predictions, ATLAS is expected to detect:
J/Y  + ≈ 500/ pb-1 , at √s = 900 GeV
J/Y  + ≈ 6000/ pb-1 , at √s = 7 TeV
Z  + /pb-1 ≈ 200/ pb-1 , at √s = 7 TeV
THE STUDY OF THESE SAMPLES HAS A DOUBLE ADVANTAGE, BECAUSE IT ALLOWS TO TEST DETECTOR CALIBRATION AND PERFORMANCE AND TO MAKE FIRST CROSS SECTION MEASUREMENTS:
First pb-1  detector and trigger understanding and calibration;
First 5pb-1  trigger and offline muon efficiency studies;
>10 pb-1  J/Y cross section measurement;

3. EARLY-DATA ANALYSIS: J/Y IN DI-MUONS
J/Psi-->mu+mu and Y-->mu+mu- Analysis Readiness Walkthrough:
CERN, Monday 31 August 2009
Trigger
Low-pt muon reconstruction
Inner Detector
Data Preparation and Analysis Model
Gruppi Italiani coinvolti (a partire dal 10/2009):
Academic
Researcher
PostDoc
PhD
LaureaMagistrale
Genova
Gemme
Cornelissen
Napoli
Alviggi M.
Carlino G.
Iacobucci G.
Della Volpe M.
Conventi F.
Rossi E.
Musto E.
Picazio A.
Roma1
Dionisi C.
Giagu S.
Luci C.
Rescigno M.
Biglietti M.
Maiani C.
Artoni G.
Ippolito V.

4. Table of Actions: Trigger
Full Table of

5. Table of Actions: Low-Pt Muon reconstruction

6. Table of Actions

7. J/Y IN DI-MUONS: MCTruth
Sample
#Eventi
Ecm
Luminosità
mc Pythia_directJpsimu2p5mu2p5.merge.AOD.e355_s462_s520_r809_r838_tid096508
199905
10TeV
6,9 nb-1

8. J/Y IN DI-MUONS: MCTruth (DeltaR vs MuonPt generator cut)
Mu6Mu4

9. J/Y IN DI-MUONS: LVL1
Single Muon LVL1 trigger and/or DiMuon Lvl1 trigger
LVL1 turn-on curves from data
Standard/non standard Thresholds
Mu6Mu6
Mu6Mu4

10. Fake-dimuons Lvl1 trigger
J/Y IN DI-MUONS: LVL1 and HLT TRIGGER: Fake-dimuons Lvl1 trigger
Fake-dimuons Lvl1 trigger
Cosmic “DiMuons”: run (Nov ‘09)
NMuctpi_hit>1
muctpi f1
muctpi f2
fake dimuons from
phi overlaps
Single Muons (simulation)
J/psi -> mu mu Riunione AtlasItalia

11. J/Y IN DI-MUONS: Reconstruction (NO TRIGGER AWARE)

12. Conclusioni:
Gruppo italiano di analisi J/Ψ costituitosi da poco (10/2009)
Coordinamento con le attività e le principali richieste provenienti dalla JPsiWalkThrough
Differenti tasks: Trigger, LowPt muon Reconstruction, Tracking in the ID, background rejection from π/K
Attività appena partite…eventuali nuove forze sono benvenute!!!