Scintillator (semi)DHCAL?

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Scintillator (semi)DHCAL?

• Vishnu Zutshi
• for

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Introduction

• Can a scintillator (semi)digital calorimeter
  work?
• Cell sizes are necessarily 6-12 cm2
• Can one control energy resolution for these sizes
  (no strong evidence that pattern recognition will
  fail for these sizes)?
• SD detector used for these studies

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Sampling Weights

• Determined from 10 GeV charged pions
• Minimize
• (1/N) S (E0 aiLi)2
  where
• E0 is the incident energy
• ai is the weight for layer i
• Li is the energy/number of hits in lyr i
• For simplicity i2 considered here

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Energy Resolution
single threshold
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ZZ Events
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Simple Jet Reconstruction

• Pt order stable mc particles (neutrinos are
  ignored)
• Start with highest pt particle and cluster
  particles within a 0.7 cone
• Repeat procedure with remaining particles

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Jet Composition
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Energy Smearing

• Fit the sigmas as a function of the incident
  energy
• Throw a random gaussian
• Smear the neutral hadron E accordingly
• Photons are smeared with a 17 term
• Generated E used for charged hadrons

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Sanity Check
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Impact of Neutral Hadrons
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Jet Energy Resolution
Fitted widths
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Jet Energy Resolution
rms
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Jet E/Egen (digital)
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Jet E/Egen (analog)
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Single Particle Resolutions
Non-projective geometry single threshold
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Single Particle Resolutions
Non-projective geometry dual threshold
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Projective vs Non-projective
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Jet Energy Resolutions
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Summary

• Monte Carlo single particle resolutions
  convoluted in jet resolutions indicate that cells
  of size 9cm2 can be used to measure energy with
  reasonable degree of accuracy in a (semi)digital
  manner
• Only simple counting was used