Călin Alexa, CERN, July 2004 1/8 ATLAS Tilecal: pion – proton comparison C. Alexa, S. Constantinescu, S. Dita 2002 test-beam data QGSP 2.7 LHEP 3.6 Groom.

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Presentation transcript:

Călin Alexa, CERN, July /8 ATLAS Tilecal: pion – proton comparison C. Alexa, S. Constantinescu, S. Dita 2002 test-beam data QGSP 2.7 LHEP 3.6 Groom predictions

Călin Alexa, CERN, July / test-beam data: the energy interval imposed by Cerenkov counter electrons beam: 50, 100 and 180 GeV pion beams: 50, 100 and 180 GeV QGSP 2.7 and LHEP 3.6 D. E. Groom: (SDC Collaboration Note SDC (1993)) Geant3 simulations predict a difference between pion and proton response in a non-compensating hadronic calorimeter explained by a smaller pure hadronic fraction of pions due to leading π 0 produced by charge exchange mechanism

Călin Alexa, CERN, July /8 - for iron absorbant and scintillator Groom predictions are: E 0 =0.96 for pions and E 0 =2.62 for protons m=0.816 for pions and m=0.814 for protons - e/h = 1.36  0.11 was determined in ATLAS Tilecal (CERN/LHCC 95-44) - e/π, e/p and π/p obtained using the above formula and the experimental e/h value will be shown as Groom predictions

Călin Alexa, CERN, July /8

Călin Alexa, CERN, July /8

Călin Alexa, CERN, July /8

Călin Alexa, CERN, July /8 ratio between pion and proton pure hadronic fractions

Călin Alexa, CERN, July /8 Summary and conclusions e/  and e/p ratio: a small decrease with beam energy for data and simulations a better description of the data by QGSP 3.6 no  dependence  /p ratio: a good description of the test-beam data by the MC e/pi and e/p test-beam data were used to obtain this ratio good agreement between test-beam data and simulations (QGSP better then LHEP) data, QGSP and LHEP predictions are showing a small increase with the energy in contrast to the constant behavior predicted by Groom ratio: