Pion Showers in Highly Granular Calorimeters Jaroslav Cvach on behalf of the CALICE Collaboration Institute of Physics of the ASCR, Na Slovance 2, CZ -

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Presentation transcript:

Pion Showers in Highly Granular Calorimeters Jaroslav Cvach on behalf of the CALICE Collaboration Institute of Physics of the ASCR, Na Slovance 2, CZ Prague 8, Czech Republic, EXPERIMENT CALICE 1 m 3 SCINTILLATOR CALORIMETER HCAL 90 cm 3 cm 1 mm ECAL HCAL TCMT calorimeter setup HCAL  Test beam data taken in at CERN and FNAL in the energy range 8-80 GeV  Data vs MC comparison for different Geant4 physics lists: QGSP_BERT → Favoured by LHC experiments, GeV: LEP FTFP_BERT, FTF_BIC → New developments, retuned CHIPS → Experimental, no model transition 38 layers, 2 cm Fe absorbers + 5mm scintillator thick tiles, 5.3 λ I 7608 photodetectors SiPM A layer = 216 scintillator tiles, 3x3, 6x6, 12x12 cm 2 Photodetector: 1156 pixels in Geiger mode Gain ~ Tile equipped with: WLS fibre photodetector calibration fibre Visible energy in HCAL as a function of beam energy π shower properties: data / Geant4 physics list Si/W ELECTROMAGNETIC CALORIMETER ECAL beam tests DESY, CERN, FNAL in layers of tungsten 24 X 0 total, 1 λ I ½ integrated in detector housing compact and sulf- supporting detector In total 9720 channels 6x6 PIN diode matrix Resistivity 5kΩcm 80 (e/hole pairs)/μm Thickness 525 μm Front End electronics zone Shielding Silicon wafer PCB Tungsten H structure 62 mm MOTIVATION FOR e+e- COLLISIONS Jet energy resolution improvement by a factor ~2 with respect to LEP separation of Z 0, W hadronic decays, multijet final states Better spatial single particle separation PROPOSED SOLUTION Particle Flow Algorithm (PFA) Combination of effective reconstruction in the tracker with separation of charged and neutral clusters in calorimeters requires high calorimeter segmentation Reconstruction package = PandoraPFA RESULTS MC studies for ILD: detector meets this requirement for GeV jets Benchmarked using Z 0 hadronic decays M.A.Thomson, NIM A611 (2009)25 CALICE test beam data, PandoraPFA reconstruction, MC comparison Crucial test for PFA performance Two test beam showers superimposed, one of them considered as a neutral cluster Difference between recovered and measured energy is the most sensitive characteristics Two different MC physics models used for comparison The agreement between data and MC confirms the previous results based on simulation only CALICE Collaboration, 2011 JINST 6 P07005 z Longitudinal shower in profile in HCAL - high granularity improves reconstruction of shower starting point - underestimated by most of models - CHIPS model overestimates - sensitive to the shape of electromagnetic part in the hadronic shower Longitudinal shower profile in ECAL _TRV Shower composition: - electrons/positrons knock-on, ionisation - protons from nuclear fragment. - mesons - others - sum data Significant difference between models, especially for protons (short range component). Granularity allows to disentangle contributions π shower properties: data / Geant4 physics list Lateral shower in profile in HCAL - lateral shower profile critical for PFA performance - underestimated by most models - best described by CHIPS model - sensitive to the shape of electromagnetic part in the hadronic shower r Shower substructure in HCAL: no. of track segments Small energy favours 'BERT' models Towards high energy: underestimation of content in SiW Ecal Relatively small difference between models (~15%) Lateral shower profile in ECAL MIP-like track segment in event Mean track multiplicity underestimated by all models Best agreement with QGSP-BERT, QGSP_BERT_TRV and FTP_BERT MIP-like tracks can be used for calibration Calorimeter prototypes with high granularity were built and successfully tested in beams Imaging calorimetry allows for the validation of hadron shower simulations at an unprecedented level of details FTF based models agree with data within 5-10% and show the best overall performance ( GeV) QGSP_BERT physics list gives better description of test beam data than LHEP The agreement between PandoraPFA reconstruction of real test beam data and MC simulation demonstrates the reability of MC simulation done for the full size detector (CALICE Coll., 2011 JINST 6 P07005) High granularity allows to correct for e/pi ratio with 15-20% improvement in energy resolution, better correction for shower leakage Conclusions Future: From the physics to technological prototype SiW ECAL in LDC detector Technical solutions for the final detector: realistic dimensions, integrated front end electronics Small power consumption: power pulsed electronics Optimised granularity of calorimeter cells: 5x5 mm 2 (ECAL), 30x30 mm 2 (AHCAL), 10x10 mm 2 (DHCAL) 1/16 of HCAL barrel in LDC detector The ECAL ASIC – SKIROC  64 ch., full power pulsing capability  Dye size 7229 um x 8650 um CALICE Collaboration, 2010 JINST 6 P07005 CALICE Collaboration, 2008 JINST 3 P08001 CALICE Collaboration, 2010 JINST 5 P05004 Longitudinal shower centre as a function of beam energy Transverse shower centre as a function of beam energy Energy response linear to < 1% Energy resolution σ E /E = 16.5%/√E  1.1  VSS Split: Analog part Mixed par Digital part