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Muon chamber efficiencies and muon identification. Andrea Venturi INFN Pisa thanks to Tommaso Boccali. Introduction. In ALEPH muon identification relies on the tracking capability of HCAL and Muon chambers HCAL : at least 40-50% of fired hits (out of ~23)

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Muon chamber efficiencies and muon identification

Muon chamber efficienciesand muon identification

Andrea Venturi

INFN Pisa

thanks to Tommaso Boccali

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa


Introduction
Introduction

  • In ALEPH muon identification relies on the tracking capability of HCAL and Muon chambers

    • HCAL: at least 40-50% of fired hits (out of ~23)

    • Muon-ch: at least one hit (out of 4)

    • HF/LEP1 muon id: HCAL and Muon-ch

    • LEP2 muon id: HCAL or Muon-ch

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa


Simulation
Simulation

  • Simulation of the digital readout is strongly correlated with the simulation of the muon identification

    • Digital readout efficiency  muon id efficiency

    • Digital readout was relatively fragile and almost impossible repairing it during data taking

      • Digital readout efficiency was not always stable and as high as possible.

    • How is the simulation done:

      • single HCAL/muon-ch layer efficiency measured with di-muons events (lack of statistics at LEP2) and hits are randomly deleted in MC events to reproduce the measured efficiencies

        • done on a year by year basis

        • NO correlation among planes is taken into account

        • inefficiencies are distributed uniformly in the whole HCAL/muon-ch plane

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa


Where we are now
Where we are now

  • Tommaso released the new muon chamber efficiency banks (MCPE) for 1997-2000

    • They replace almost dummy banks used so far:

      • 1994 efficiencies + ad hoc corrections for known damaged chambers

    • Measured with di-muon events  mainly Z calibration run

      • are they representative of the mean muon-ch efficiencies ?

    • Check done:

      • Muon-chamber efficiencies measured with 2 photon events

        • better distributed in time

        • low momentum

        • mainly in the endcaps

      • Muon-chambers occupancy maps

    • We decided that efficiencies measured with di-muons events are good enough.

  • HCAL final efficiencies: to be done !!

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa


What i m going to talk about
What I’m going to talk about

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa






A test
A test

  • Sensitivity of the muon identification efficiency on the muon chamber efficiencies

    • I have used different muon chamber efficiency banks to analyze the same sample of di-muon MC events at Z peak (300k)

      • Used efficiency banks

        • 1994

        • 2000 old (dummy) version

        • 2000 new (Tommaso) version

        • all layers of all chambers 90% efficient

        • all layers of all chambers 60% efficient

    • Useful to:

      • give us a reference on the requested accuracy to build the efficiency banks

      • give us an indication on how likely is the possibility that the observed data vs MC discrepancy are due to innacurate muon chamber efficiency mapping

    • BE CAREFUL: this test does NOT say anything about the intrinsic approximation of the efficiency simulation algorithm

      • no corralations, spread inefficiencies...

Muon-ch efficiencies- Andrea Venturi - W meeting in Pisa












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