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CMS Hadron Outer calorimeter : Performance plots

Explore detection efficiency and response to cosmic muons in the CMS Hadron Outer Calorimeter. Measures, layouts, and incident angle effects analyzed. Contact: cms-dpg-conveners-hcal@cern.ch

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CMS Hadron Outer calorimeter : Performance plots

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  1. CMS Hadron Outer calorimeter : Performance plots The CMS collaboration Contact : cms-dpg-conveners-hcal@cern.ch

  2. Introduction • Presentation about detection efficiency of the CMS Hadron Outer (HO) calorimeter • 4April 2014, new readout electronics - Silicon Photo Multiplier (SiPM) was installed for the HO • In the following April Global Run (7 – 11 April) , muons from cosmic rays were collected with a Drift Tube (DT) trigger without magnetic field, enabling us to measure the detection efficiency without any bias • The detection efficiency is measured by extrapolating reconstructed muons to the nearby HO tile and ask if the signal exceeds a certain threshold

  3. HO Layout • Designed as a tail catcher for high energy jets • 1 scintillator layer for Ring ±1, ±2 • 2 scintillator layers for Ring0 to ensure lint > 10 alike Ring 1, 2 • 30 sections along Z-axis (ih = [-15, -1] and [1,15]) • 12 sectors, each consists of 6 sections (if= [1, 72]) Quarter-cut view of the CMS detector. HO locates outside the magnet at R ~ 4m Layout of all HO trays in the overall CMS detector

  4. Response to cosmic muons • Extrapolate reconstructed muon to the nearest HO tile • Compare the signal distribution with and without associated muon Muon Nearest HO tile Muon trajectory (dotted line) and its extrapolation to the nearby HO tile (blue) Signal spectrum with (blue) and without (red) associated muon(ih = -9, if = 55)

  5. Detection efficiency (1) • Extrapolate muon to the HO plane and ask if the tile has a signal with (ADC – pedestal) > 12 • Quality cuts are applied to ensure good quality muon • c2, fiducial cut and extrapolation point 5 cm away from the edge • Missing region in ih = ± 4 due to a missing HO tile (vacuum chimney is installed) • Low efficiency in if = 28, 29 due to cable swap • Low statistics : ih= 4, if = 40 HO detection efficiency map

  6. Detection efficiency (2) • Extrapolate muon to the HO plane and ask if the tile has a signal with (ADC – pedestal) > 12 • Quality cuts are applied to ensure good quality muon • c2, fiducial cut and extrapolation point 5 cm away from the edge • Median : 98.8% • Most probable value : 99.3% Distribution of the detection efficiency for each HO tile

  7. Incident angle dependence • Only ring±1, ±2 are shown for cosq> 0.3, where stat. is enough • Ring0 has two scintillator layers and the dependence is complicated • 1/cosqdependence of the average path in Ring1 and Ring2 follow the same trend • Different cable length and the tile geometry can account for the difference between Ring1 and Ring2 Muon q HO tile Signal size dependence on the incident angle. The dotted line shows the linear fit to indicate the linearity

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