Scintillator (semi)DHCAL?

Vishnu Zutshi

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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

Sampling Weights

• Determined from 10 GeV charged pions

• Minimize:

(1/N) (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 i=2 considered here

Energy Resolutionsi

ngle

thre

shol

d

ZZ Events

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

Jet Composition

Energy Smearing

• Fit the sigma’s 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

Sanity Check

Impact of Neutral Hadrons

Jet Energy ResolutionF

itte

d w

idth

s

Jet Energy Resolutionrm

s

Jet E/Egen (digital)

Jet E/Egen (analog)

Single Particle ResolutionsN

on-p

roje

ctiv

e ge

omet

ry s

ingl

e th

resh

old

Single Particle ResolutionsN

on-p

roje

ctiv

e ge

omet

ry d

ual t

hres

hold

Projective vs Non-projective

Jet Energy Resolutions

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