Longitudinal shower profile of the desy and cern testbeam data in the electromagnetic calorimeter
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Longitudinal shower profile of the DESY and CERN testbeam data in the electromagnetic calorimeter. Valeria Bartsch (UCL) & Nigel Watson (Birmingham). cuts/corrections currently used. E hit >0.6 E MIP 0.5 E beam < E total < 1.5 E beam Cerenkov cut for CERN runs with combined e-/ p beam

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Longitudinal shower profile of the DESY and CERN testbeam data in the electromagnetic calorimeter

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Longitudinal shower profile of the desy and cern testbeam data in the electromagnetic calorimeter

Longitudinal shower profileof the DESY and CERN testbeam data in the electromagnetic calorimeter

Valeria Bartsch (UCL)

& Nigel Watson (Birmingham)


Cuts corrections currently used

cuts/corrections currently used

  • Ehit>0.6 EMIP

  • 0.5 Ebeam < Etotal < 1.5 Ebeam

  • Cerenkov cut for CERN runs with combined e-/p beam

  • cut on gaps in the detection layers

  • @ first layer:

    c2 = (x-xmean/sx)2 + (y-ymean/sy)2 < 20


Motivation of c2 cut

Motivation of c2cut

cut

CERN run at 30GeV

MC

data

preshowering is shifting the longitudinal shower profile, cuts at the first layer likely to reduce this a bit

(though only cutting away small percentage of data)

c2 = (x-xmean/sx)2 + (y-ymean/sy)2 < 20


Cern e beam 20gev

CERN: Ebeam=20GeV

  • MC prediction smaller than data before shower max and higher after shower max

  • layer thickness 1-10:11-20:21-30 weighted by 1:2:3

  • data well described by function


Desy e beam 6gev

DESY: Ebeam=6GeV

data in the downstream layers are well described though there are missing layers


Selected runs

selected runs

  • shower maximum increasing with increasing beam energy

  • integral increasing due to increasing beam energy


Comparison between cern desy run at 6gev

Comparison between CERN & DESY run at 6GeV

CERN and DESY data are well comparable

=> Use them in one plot for the subsequent analysis


Shower maximum

shower maximum

CERN runs at 30GeV

with angle

  • shower maximum increases with ln(Ebeam)

  • for the angle shower max is proportional to increased distance in calo


Estimate of energy in missing layers in desy runs

estimate of energy in missing layers in DESY runs

with corr

without corr

estimate from integral of the fitted parametrization over the missing layers

changes in the linearity plot of D. Ward if considering these estimates


Leakage energy

leakage energy

leakage from fit integral from the end of the calo to inf

leakage from Ebeam-Emeas

  • Not a good prediction, still many questions:

  • How exact is the beam energy?

  • What does MC predict?

  • How much energy is measured in the HCAL?

  • Is there any inherent problem with the prediction?

  • What happens at different angles?


Conclusion

conclusion

  • longitudinal shower profile can be nicely fitted

  • conclusions about the shower max and the energy in not-instrumented layers at DESY runs can be drawn

  • there needs to be more thought put into the leakage energy though


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