November, 15 HCAL General S. Banerjee, O. Kodolova 1

HCAL DPG report

Sunanda Banerjee – SINPOlga Kodolova – SINP MSU

November 15, 2012

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 2

Outline• Data vs MC issue for TP’s• Filter for HCAL Laser Events• HB/HE raddam monitoring• DPG Organization chart in 2013

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 3

TPs (data vs MC) issue-I

L1 DPG reported on the 5th of November that some of trigger bits have event rate different for Data and MC.

B.WinerOct.2012

A.Heister,March, 2

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 4

TPs (data vs MC) issue-IIGobinda investigated the difference in RecHits between Data and MC(report at HCAL DPG on Nov. 12)

EM : Tower

HCAL : Tower

EM : Sum

HCAL : Sum

Tower spectra are similar while Sum (HCAL) spectra are different

||<1.4

Gobinda Majumder

EM and Hadronic pT spectrum in Endcap (1.4<||<2.9)

EM : Tower

HCAL : Tower

Sum is much larger in MC, number of towers is larger in MC

EM : Sum

HCAL : Sum

Gobinda Majumder

Number of CaloTowers in different regions

# of clusters in barrel is nearly the same between data and MC. In endcap and in HF region it is much larger in MC than in data

Barrel Endcap

HF

Gobinda Majumder

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 7

TPs (data vs MC) issue-IIIMatching between TP’s and Rechits is a non-trivial task as TP’s can appear out of SOI (apart rechits) and there is some geometrical difference at the end of HE (ieta>20).

Most of unmatchedIn endcap

PawandeepJandir

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 8

TPs (data vs MC) issue-IV/ZeroBiasHPF0/Run2011B-v1

PawandeepJandir

November 15, 2012 HCAL General Meeting

Hcal Laser Events in Data HBHE and HF laser events in

physics data through August 2012 No indication of contamination

from HO laser events, or from HF RADDAM events

November 15, 2012 HCAL General Meeting

Filtering Hcal Laser Events Simple filter: remove events with >

N calibration digis in a subdetector Large number of calibration digis

only present in laser (and NZS) events

Can also filter HBHE laser events by comparing occupancies in RBXes that receive/don't receive laser signals

HBHE calib digi laser cut

“Contour cut” separating laser events

HF calib digi laser cut

HF digi

HF C

alib

all results from /JetHT/Run2012C-v1/RAW sample

Jeff Temple

November 15, 2012 HCAL General Meeting

Scope of problem In 2012C

dataset, ~0.14% of events flagged as HBHE laser

~0.6% of events flagged as HF laser

Jet triggers weremostly polluted

Jeff Temple

November 15, 2012 HCAL General Meeting

NZS bug When porting filter from private area to CMSSW, check on NZS

was dropped Because laser filter checks calib digi occupancy, NZS events all

flagged as laser events Small overcleaning effect (1/4096); overcleaning does not bias

results Corrected filter already in place; already generating revised laser

event list

Results for subset of JetHT/2012C-v1/RAWdatasetLaser events appear at the same rate in ZS and NZS events, as expectedCorrected filter recovers 6311 events falselyflagged as laser events(Compare with 184768 correctly-flagged events, and 25 million total events)

Jeff Temple

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 13

Raddam correction in HE - I

DoubleMu data - 11 periods in 2012We have corrections but do notunderstand the jump in outer ringsafter June technical stop.

RobertCiesielski

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 14

Raddam correction in HE - II

Zvtx position is shifted starting from period 3 – can it be a part of explanation?

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 15

DPG organization chart in 2013

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 16

Back-up

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 17

Laser events pollution issuesLaser events were penetrated into Physics streams and laser was switched off on the 21st of August. The corresponding filter wascreated by Jeff Temple to extract laser events.

Identification was done via: patterns in HCAL rechits number of calibration digis

However, filter finds “laser-like” eventsin runs taken after 21st of August (reportfrom JetMET)After investigation it appears that theseevents are from NZS stream

The new version of filter (uses only mark-and-events) is prepared andis available in 5_3_6_patch1.Reskimming of Run2012A,B,C is under way

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 18

Calibration procedure from 2011 to 2012

HPD and PMT gain drift

HPD gain drift correction once per month (as in 2011)

PMT gain drift correction once per week (roughly each ~1/fb) due to much higher degradation rate of gains in PMT (change w.r.t. 2011)

HF Fibers degradation

Radiation damage correction in HF based on the radiation damage measurements once per month (depends on the measurement) (change w.r.t. 2011)

We consider HF is correctly calibrated with Z->ee corrections for the 2012 startup

The above corrections as HcalGain condition IOV will be uploaded by creation to _express, _prompt and _offline tags and (by agreement) to _hlt tag

November 15, 2012 HCAL General Meeting S. Banerjee, O.Kodolova 19

Calibration procedure (continuation)phi-symmetry corrections with iterative and NZS method (as in 2011) during technical stops while the needed statistics is available

Isolated track calibration (as in 2011) during technical technical stops while the needed statistics is available

Absolute scale in HF with Z→ee corrections (Long fibers). Short fibers will be calibrated using Long fibers calibration and MC correction for ratio between Long and short taking into account RadDam estimation for Short fibers

The above corrections as HcalRespCorrs condition IOV will be uploaded by approval to_express, _prompt, _offline and _hlt tags