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HF Calibration coefficients HF Calibration coefficients (from Data and DB) Status Report(from Data and DB) Status Report
Murat Ali Guler, Kadir Ocalan (METU)
Ferhat Ozok, Kerem Cankocak (Iowa)
HF meeting 29 July 2008
Electromagnetic Channel Hadronic Channel
LED data Run 977
Electromagnetic Channel Hadronic Channel
Source Data Gains from DBS
Electromagnetic Channel Hadronic Channel
Electromagnetic Channel
Hadronic Channel
= 33,35,38,39, =3
= 40, =63,67
= 32,38,39,40 =3
= 40 =63,67
Low intensity LED Run 53000 (1350 V)
SPEi :
the single
photoelectron
response
Ci=(<N
pe>* SPE
i )-1
<Np.e
>~ 0.28/GeV
calib.cefff ~1/gaincalib.cefff ~1/gain
Rechit occupancies from Cruzet 3 data
HF Rechits in Cruzet 3 data
Jet construction in Cruzet3
LED run 53000
Low RMS
(SPEV2
/SPEV1
)=(V2/V1)
= 5.08
Comparison of gains at different HV
Electromagnetic Channel
Hadronic Channel
C1100
/C1150
Comparison of the calib Coefficients which are in DB
C1100
/C1250
C1100
/C1350
C1150
/C1250
C1150
/C1350
C1250
/C1350
Next step:Next step:
- we need more data (Low intensity LED runs) for HFM (and also HFP)
- more analysis of Cruzet data
-
Backup slidesBackup slides
Validation studies for HF Calibration
Documentation of Single Photoelectron Peak measurements and source for the calibration:
CMS IN 2006/037; 9'th ICATTP, World Scientiic pp 339-342 (2006); CMS IN 2006/044; CMS IN 2006/045; CMS IN 2006/138; CMS IN 2007/012 ;CMS IN 2007/018; CMS IN-2008/015; and more..
Preliminary results fromPreliminary results from
- SPE vs Data Base comparison- SPE vs Data Base comparison
- analysis of HF LED runs using SPE gains and Data Base gains- analysis of HF LED runs using SPE gains and Data Base gains
-Cosmic ray data analysis -Cosmic ray data analysis
calib. coefficients in DB 1150V calib. coefficients in DB 1150V gain ratio PMT(1250V)/PMT(1150V) =1.5gain ratio PMT(1250V)/PMT(1150V) =1.5 calib.cefff ~1/gaincalib.cefff ~1/gaincalib. coeff(1250V) = calib.coeff(1150V) * 0.66calib. coeff(1250V) = calib.coeff(1150V) * 0.66
HF- hadronic channels
HF+ hadronic channels
HF Calibration coefficients from Data Base (GeV/fC) HF Calibration coefficients from Data Base (GeV/fC) frontier://Frontier/CMS_COND_20X_HCALfrontier://Frontier/CMS_COND_20X_HCAL
HF- electromagnetic channels
HF+ electromagnetic channels
Mean ~0.22 GeV/fCRMS ~0.06 GeV/fC
Mean ~0.20 GeV/fCRMS ~0.04 GeV/fC
Mean ~0.35 GeV/fCRMS ~0.09 GeV/fC
Mean ~0.31 GeV/fCRMS ~0.06 GeV/fC
Electromagnetic channels (long fibers) Hadronic channels (short fibers)
Comparison of the calibration constants (Ci) of LED and DB gains (C_src)
Ci= (<N
pe>* SPE
i )-1 where <N
i> is the mean number of generated
photoelectrons/GeV and SPEi is the single photoelectron response of the ith channel
(similar method as in CMS IN 2007/018)
<Np.e
>~ 0.28/GeV from analysis of 100 GeV electron data taken in 2004 test beam.
HF+ Run 977 (100 K events) at low LED intensity (1350 V)
Electromagnetic channels Hadronic channels
Mean = 0.92RMS=0.12
Mean = 0.91RMS=0.12
RMS ~ 0.48 GeV
RMS ~ 0.75 GeV
RMS ~ 0.68 GeV RMS ~ 0.68
GeV
RMS ~ 0.43 GeV
Cruzet 3 Run 51403 (CSC, DT, HCAL trigger)
HF Calibration coefficients from Data Base HF Calibration coefficients from Data Base frontier://Frontier/CMS_COND_20X_HCALfrontier://Frontier/CMS_COND_20X_HCAL
Electromagnetic channels (long fibers)
Cruzet 3 run 51403
(Shift in binning !)
Reflections of the gains in the cosmic muon data
HF Calibration coefficients from Data Base HF Calibration coefficients from Data Base frontier://Frontier/CMS_COND_20X_HCALfrontier://Frontier/CMS_COND_20X_HCAL
hadronic channels (short fibers)
Cruzet 3 run 51403
(Shift in binning !)
Reflections of the gains in the cosmic muon data