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