HCAL General Meeting: DPG Status 1Olga Kodolova / Frank Chlebana

HCAL DPG StatusHCAL DPG Status

Olga KodolovaFrank Chlebana

HCAL General MeetingApr 21, 2011

HCAL General Meeting: DPG Status 2Olga Kodolova / Frank Chlebana

Done: HCAL Calibration have been provided for CMSSW_4_2_0 Response correction function to correct for HB channels

with missing LO filter Online conditions have been updated Rate of high energy hits have been reduced after HF sleeve

replacement

On going urgent tasks:Migrating HF filters to HLT Adding RBX/HPD noise filter in some MET trigger paths Investigating methods to reduce L1 HF pre-triggering: apply BX-1 veto or/and develop L1 TP filtersReducing Out Of Time pile-up

Current statusCurrent status

HCAL General Meeting: DPG Status 3Olga Kodolova / Frank Chlebana

2011 startup conditions - done ChannelQuality Pedestals HF gains after sleeve replacement Response corrections with phisym (|ieta|<41) and scale (|

ieta|<22-23)Start of data taking with 3.11(4.1): Included phi-symmetry in L1 and HLT+recoReprocessing with 4.2: Include the full HCAL calibration at HLT and Reco; L1 will stay

with phisym correctionsCaveat: iphi=-6, iphi=-32Special treatment for HLT and Reco. Response correction kept = 1

at L1.

Calibration and condition statusCalibration and condition status

HCAL General Meeting: DPG Status 4Olga Kodolova / Frank Chlebana

L1 rateL1 rate

Constant Responsecorrection forProblematic channelsIphi=-6 and Iphi=32

Note: at HLT and RECOwe are using functionto account for the missing neutral energyFilter at L0

HCAL General Meeting: DPG Status 5Olga Kodolova / Frank Chlebana

Calibrations included for CMSSW4.2 HBHE relative and absolute HF relativePostponed to the next release HF absolute scale (Zee)On going: improving calibration with higher statistics; CASTOR

and ZDC calibration Reconstruction (on going): Minor changes in the definition of rechit bits Unify strategy of rechit flags used for flagging noise Include More in:https://twiki.cern.ch/twiki/bin/view/CMS/HcalDPG2011Tasks

Reconstruction and Calibration plansReconstruction and Calibration plans

HCAL General Meeting: DPG Status 6Olga Kodolova / Frank Chlebana

Observe a rate from triggering in the BX-1 crossingdue to PMT window events .Adjustment of HF signal position allows PMT window events arriving in the earlier crossing Possible solutions: - Veto on BX-1Run 162929 looks very promising: 1 pre-triggered event over 55794 - L1 TP filters Code exists but parameters need tuning and firmware requires update. Filters rely on isolation may appear to be less effective as occupancy increases and may disturb some physics channels

Pre-triggeringPre-triggering

HCAL General Meeting: DPG Status 7Olga Kodolova / Frank Chlebana

Pre-triggering (Jim)Pre-triggering (Jim)

HCAL General Meeting: DPG Status 8Olga Kodolova / Frank Chlebana

Tuning HBHE noise filters in PU conditions from 75 ns->50ns. First results looks promising but need extensive testing before making filtersdefault .Plan to migrate HF noise filters (Topological and Pulse shape) to HLTHF topological filter becomes less efficient with changing reconstruction from 4TS to 2TSHLT versions of Filters were presented to the TSG.We prefer not to apply filters at HLT unless absolutely necessary

Some caveats: Not RECO but AOD will be stored at Tier2-> access to TS may be not possible unless we ask for HCAL DPG skim. Today, after HCAL general we will have the meeting dedicated HF noise sources

NoiseNoise

HCAL General Meeting: DPG Status 9Olga Kodolova / Frank Chlebana

Initial pileup discussion with Jetmethttps://indico.cern.ch/conferenceDisplay.py?confId=134118Jamboreehttps://indico.cern.ch/conferenceDisplay.py?confId=134144Developments: Change HBHE energy reconstruction from 4TS to 2TS Develop filters to remove OOT pileup Fit pulse shape train in TS2-TS9

Plus pileup subtraction methods provided by JetMET.

Need to verify what option gives the best Jet andMET resolution

Out of time PileupOut of time Pileup

HCAL General Meeting: DPG Status 10Olga Kodolova / Frank Chlebana

Shifts are on going in SINP MSU and FNAL ondaily basis.

HCAL Offline shiftsHCAL Offline shifts

HCAL General Meeting: DPG Status 11Olga Kodolova / Frank Chlebana

• Verify simulation of HO including SiPm• Evaluate HO usage for the different objects and recommend appropriate reconstruction settings• Develop a calibration strategy of HO• Provide calibration constants for HO• In collaboration with JetMET demonstrate improvements in jet reconstruction

HO Task force HO Task force