Calo meeting – 02/05/2009

Calorimeter

Olivier Deschamps LPC Clermont-Fd

simulation

tuning for MC09

Tuning calo parameters for simulation

2

• Purpose

• Tune calo parameters for simulation/digitisation against new G4• Possibly sizeable changes as there is major change in EM model in G4 v8

• Which paramaters to be tuned ?

• Spd threshold is defined as a fraction of MIP• Preshower ADC dynamics defined as 100 MIPs

condDB parameters used at the digitization level both depend on the actual MIP deposit in MeV

• Ecal and Hcal activeToTotal ratio Used in Boole to convert MC total energy deposit into ADC

ADC = (ActiveToTotal * visibleEnergy)/Gain

• Parameters to be set as conditions in condDB (XCal/Calibration/Gain.xml)

Available MC

2

• MC validation sample• Use PGUN pions and electrons• Various energies from 100 MeV to 168 GeV• 3 configurations :

• MC2008 : LHEP + EM option1 + DRay off + KineHT• MC2008HT : LHEP + EM option1 + DRay on + KineHT • MC2008LT : LHEP + EM option1 + DRay on + KineLT • LHEP parameterised modeling of hadronic interactions (G4)

• EM option1 EM processes using parameters optimised for better CPU performance at the cost slightly less precise physics (G4) • DRay off production cuts as follow: e- 10 km, e+ 5 mm, gamma 10 mm (G4) • DRay on production cuts as follow: e- 5 mm, e+ 5 mm, gamma 5 mm (G4) • KineHT tracking cuts (kinetic E) as follow: hadrons/mu+/mu- 10 MeV, e+/e-/gamma 1 MeV, others none (Gauss) • KineLT tracking cuts (kinetic E) as follow: hadrons/mu+/mu- 1 MeV, e+/e-/gamma 0.1 MeV, others none (Gauss)

• Apply a minimal selection on PGUN particles:• no showering before calo• small deposit in Hcal when looking electrons into Ecal• small deposit in Ecal when looking pions into HCal

MIP deposit

3

• MIP peak position in Prs/Spd scintillator plane : 2.74 MeV • Increased by 17% wrt to DC06 (was 2.35 MeV)

Prs dynamics in condDB : 235 -> 274 MeV keep Spd threshold unchanged in condDB ~ 0.6 MIP (~0.7 MIP in DC06)

DC06MC2008

deposit (MeV)

Prs visible energy

4

Gauss v24r1

<Evis> = 0.14 GeV

DC06

DC04

<Evis> = 0.16 GeV

PGUN electron 34 GeV (MC2008)

• Increase of the Prs visible energy ~ +14% wrt to DC06

ActiveToTotal for Ecal

5

Gauss / config Total/ActiveV36r0 / mc2008 6.05V36r0 / mc2008LT 5.75V36r0 / mc2008HT 6.25

V24r1 / DC06 7.26v15r9 7.31

V15r3 / DC04 7.84v14r2 8.31

SICBMC/Geant3 7.1

20082008HT2008LT

Evis = a Etot (+b)

a-1 provides the ActiveToTotal ratio for condDB b non consistent with 0 due to energy loss before Ecal

Ecal Total/Active decreases by 15% wrt to DC06

ActiveToTotal for Hcal

6

Gauss / config Total/ActiveV36r0 / mc2008 37.7V36r0 / mc2008LT 32.2V36r0 / mc2008HT 38.0

V24r1 / DC06 55.5V15r9 56.5

V15r3/DC04 55.5v14r2 62.5

20082008HT2008LT

Hcal Total/Active decreases by 30% wrt to DC06

Summary

7

• New condDB parameters for MC2008/2009• significant change wrt DC06 in MIP deposit and Xcal visible energy• use ‘mc2008’ configuration as standard to update ActiveToTotal ratio and Prs dynamics range in conDB• condDB update with the new value

• Next to be checked/re-tuned• photon/electron reconstruction parameters : S-shape, fine energy correction• calo PID reference PDF• To be done with new MC data produced with the correct energy scale

• A 2nd round of validation sample is being produced with the new setting• electron/pion/photon/pi0 with no material in front of Calo• will allow more detailed analysis and check the value are OK• Also produced : some reference channel for tuning reconstruction and PID

• Rhopi / PhiGamma / J/Psi(ee,mm)Phi