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A first look at electromagnetic events from the 2009 FNAL standalone period using bigtree data Philipp Klenze (new diploma student at the MPP) Max-Planck-Institute for Physics Munich December 10, 2009 Philipp Klenze (MPP) Electromagnetic

SLIDE 1

A first look at electromagnetic events from the 2009 FNAL standalone period

using bigtree data Philipp Klenze

(new diploma student at the MPP) Max-Planck-Institute for Physics Munich

December 10, 2009

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 1 / 12

SLIDE 2

Overview

1

Disclaimer

2

Simple noise correction

3

Electromagnetic events from the 2009 FNAL standalone period

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 2 / 12

SLIDE 3

Warnings

I don’t have much overview yet All analysis here was done using bigtree data No calibration accounting for temperature differences Don’t take anthing in here too serious If you have remarks or I misrepresent anything, please interrupt

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 3 / 12

SLIDE 4

Runs and cuts used

FNAL e− runs: 580085, 580087, 580090, 580092, 580093, 580154 CERN e+ runs: 350110, 350113, 350114, 350117, 350118, 350128, 350132 cuts:

beamBit (beam events)

r pedestalBit && !calibBit && !spillBit (noise events)

tcm energySum < 12.0 (filter out muons) emc energySum > 30.0 && emc energySum < 60.0 (for hadron runs only)

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 4 / 12

SLIDE 5

Noise correction — Why?

noise causes offset noise may be different for each run (temperature dependence) thus: compensate for each run seperatly rather small effect run by run corrections only — no accounting for temperature dependence of electronics response sample plots on the following slides from run 580093 (FNAL, 2 GeV electrons)

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 5 / 12

SLIDE 6

Without noise correction

ahc_energySum 20 40 60 80 100 120 140 160 180 200 200 400 600 800 1000 1200 1400

ahc_energySum__cut

Entries 40350 Mean 90.83 RMS 25.9

part of the energy sum is due to noise

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 6 / 12

SLIDE 7

Noise events

ahc_energySum 20 40 60 80 100 120 140 160 180 200 50 100 150 200 250

ahc_energySum__noise

Entries 1294 Mean 10.68 RMS 3.724

noise taken from pedestal events

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 7 / 12

SLIDE 8

Shifted to compensate noise

ahc_energySum__cut_nc

Entries 2000 Mean 80.68 RMS 26.51

ahc_energySum 20 40 60 80 100 120 140 160 180 200 200 400 600 800 1000 1200 1400

ahc_energySum__cut_nc

Entries 2000 Mean 80.68 RMS 26.51

ahc_energySum__cut

Entries 40350 Mean 90.83 RMS 25.9

energy sum corrected by mean noise of same run might improve linearity at low energies

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 8 / 12

SLIDE 9

Energy linearity

beam energy [GeV] 10 20 30 40 50 60 energy peak position [MIP] 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 positrons (CERN 2007) electrons (FNAL 2009)

slope: 40.5 MIP

GeV

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 9 / 12

SLIDE 10

Energy resolution

beam energy [GeV] 10 20 30 40 50 gaus sigma / beam energy linear fit 0.05 0.1 0.15 0.2 0.25 0.3 positrons (CERN 2007) electrons (FNAL 2009)

fit: 0.24

√ E

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 10 / 12

SLIDE 11

Deviation from linear behaviour

beam energy [GeV] 10 20 30 40 50 relative deviation from linear behaviour

0.08
0.06
0.04
0.02

0.02 positrons (CERN 2007) electrons (FNAL 2009)

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 11 / 12

SLIDE 12

Number of hits for FNAL and CERN data

beam energy [GeV] 10 20 30 40 50 60 number of hits at gaus peak 50 100 150 200 250 300 positrons (CERN 2007) electrons (FNAL 2009)

Philipp Klenze (MPP) Electromagnetic events from the 2009 FNAL standalone period December 10, 2009 12 / 12