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EMCal Update

This update discusses significant advancements made over the past year in jet and γ-jet analysis within the EMCal project for ALICE. Currently awaiting DOE funding decisions expected in September 2004, the project has faced resource limitations in software development. Notable updates include completed geometry, hits, and SDigits, while RecPoints and particle tracking remain in progress. Recent analysis reveals improved jet energy resolution and the impact of Birks' Law on background noise. Despite challenges, the collaboration anticipates further results and framework development pending project approval.

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EMCal Update

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  1. EMCal Update Heather Gray for the ALICE-USA Collaboration ALICE Offline Week: 29 June 2004 Gdfsgdfhdh

  2. Introduction • Much progress during the past year on jet and γ-jet analysis • EMCal waiting on decision from the DOE on funding (pending NSAC committee report) • Expected September 2004 • Little dedicated software manpower at present Jet in heavy-ion event 100 GeV pp jet PbPb underlying event + =

  3. EMCal Software Status • Geometry Done • Hits Done • SDigits Done • RecPoints Work in Progress • RecParticles ? • TrackSegments ? • PID ? } = identical to RecPoints for EMCal

  4. Progress Dasf Jet Finding Analysis γ-jet Analysis:The dispersion of clusters for π0’s showing where different analyses will be used Accurate direction reconstruction Isolation cut Jet energy resolution: improves with increasing energy

  5. Recent Changes • Implementation of Birks’ Law • Reduces the large hadronic background • Many bug fixes! 55% of total energy deposited before 30ns 45% of energy deposited after 30ns Neutron tail continues until ~150μs

  6. An interesting observation • Ratio = deposited energy from primaries within EMCal’s fiducial region/deposited energy from primaries outside the fiducial region

  7. An interesting observation Production vertices of particles depositing energy in the EMCal: before 30ns Production vertices of particles depositing energy in the EMCal: after 30ns Significant background from other detectors, notably MUON absorber and TOF/TRD!

  8. Raw Data • Can copy PHOS structure as a first approximation • On hold until September when we know the fate of the project • Is this OK?

  9. Conclusions • Much progress in analysis • More results from expected soon • Framework development will be continued once decision on the continuation of the project will be known

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