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Kittikul Kovitanggoon*, Sung-Won Lee, Nural Akchurin, Cosmin Dragoiu, Jordan Damgov

Study of PF jet and Calo jet in HF with Z+1 HF jet events. Kittikul Kovitanggoon*, Sung-Won Lee, Nural Akchurin, Cosmin Dragoiu, Jordan Damgov Texas Tech University. Buğra Bilin METU Efe Yazgan University of Ghent. Introduction. There are three efforts of calibrating HF detector at TTU.

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Kittikul Kovitanggoon*, Sung-Won Lee, Nural Akchurin, Cosmin Dragoiu, Jordan Damgov

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  1. Study of PF jet and Calo jet in HF with Z+1 HF jet events Kittikul Kovitanggoon*, Sung-Won Lee, Nural Akchurin, Cosmin Dragoiu, Jordan Damgov Texas Tech University Buğra Bilin METU Efe Yazgan University of Ghent

  2. Introduction • There are three efforts of calibrating HF detector at TTU. • “Gamma + jet for Forward Calibration with 2011 & 2012 Data” by Jordan Damgov https://indico.cern.ch/getFile.py/access?contribId=5&resId=0&materialId=slides&confId=236206 • “HF Z->ee Calibration” by Cosmin Dragoui https://indico.cern.ch/getFile.py/access?contribId=4&resId=0&materialId=slides&confId=236206 • “Z + 1jet event for HF jet calibration” by Kittikul Kovitanggoon (muon channel) and Bugra Bilin (electron channel) • Today we will discuss about the different between PF jet and Calo jet in Forward region • Understand this difference will help us improve the HF jet calibration

  3. Datasets • Datasets of 2012 /DoubleMu/Run2012A − 13Jul2012 − v 1 /DoubleMu/Run2012A −recover – 6Aug2012 – v1 /DoubleMu/Run2012B − 13Jul2012 − v 1 /DoubleMu/Run2012C − 24Aug 2012 − v 1 DoubleMu/Run2012C –EcalRecover –11Dec2012 – v1 /DoubleMu/Run2012C − Prompt − v 2 /DoubleMu/Run2012D − Prompt − v 1 • JSON from https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2012Analysis Cert_190456-196531_8TeV_13Jul2012ReReco_Collisions12_JSON_v2.txt Cert_190782-190949_8TeV_06Aug2012ReReco_Collisions12_JSON.txt Cert_198022-198523_8TeV_24Aug2012ReReco_Collisions12_JSON.txt Cert_190456-203002_8TeV_PromptReco_Collisions12_JSON_v2.txt Cert_201191-201191_8TeV_11Dec2012ReReco-recover_Collisions12_JSON.txt Cert_190456-208686_8TeV_PromptReco_Collisions12_JSON.txt

  4. Selections • Triggers HLT_Mu17_Mu8_v* HLT_Mu17_TkMu8_v* • Muon Muon matched trigger objects Muon pT > 20 GeV and |Muon eta| < 2.4 Opposite charge muons Tight Muon ID from Muon POG Loose PF base Combined relative ISO from Muon POG Z mass window of 70 to 110 GeV • PF Jet PF Jet pT > 30 GeV PFnoPU Compare Z+ only 1 jet in HF (|eta| >2.4) veto events that have jet in Barrel and Endcap Loose Jet ID from POG Clean Jets from muons with DeltaR<0.5 • Calo Jet Match Calo jet to PF jet with DeltaR < 0.5 Loose calo jet ID

  5. Jet pT • The comparison of the # of events between PF jets and matched calo jets. • Slopes between calo jet and PF jet are well agreed • Due to calibration? • pT ratio between PF jet and match calo jet wrt |eta| • At |eta| < 3 PF jet has higher pT than match calo jet • But ratio drops and close to calo at |eta| > 3.5.

  6. Raw Jet pT The comparison of the # of events between raw PF jets and matched raw calo jets. pT ratio between raw PF jet and matched raw calo jet wrt |eta| • Without JEC, raw jets behave the same way and corrected jets

  7. Corrected jets/Raw jets The comparison of the # of events between JEC (corrected jet/Raw jet) JEC (corrected jet/Raw jet) wrt |eta| • Close JEC applied at 3.5<|eta|<4.0

  8. HAD Energy In HF • HAD energy in HF of PF jets and matched calo jets are shown. calojet->hadEnergyInHF() pfjet->HFHadronEnergy() At |eta|>3 PF jets deposite more energy in HAD energy than calo jets? Calo jets dominated PF jets dominated

  9. EM Energy In HF • EM energy in HF of PF jets and matched calo jets are shown. calojet->emEnergyInHF() pfjet->HFEMEnergy() At |eta|>3 calo jets deposite more energy in EM energy than PF jets? Calo jets dominated PF jets dominated • Opposite direction to HAD energy

  10. Long Fiber Energy The comparison of the # of events between Long fiber energy Long fiber energy wrt |eta| L = Jet HadEHF*0.5 + Jet EmEHF

  11. Short Fiber Energy The comparison of the # of events between Short fiber energy Short fiber energy wrt |eta| S = Jet HadEHF*0.5

  12. HF Energy Variables • Calo jets • calojet->hadEnergyInHF() • calojet->emEnergyInHF() • PF jets • pfjet->HFHadronEnergy() • pfjet->HFEMEnergy() http://cmslxr.fnal.gov/lxr/source/RecoJets/JetProducers/src/JetSpecific.cc Calo Jets PF Jets

  13. Conclusions Conclusions • In order to measure the Z+jets cross section in all CMS region, HF jets need new calibration set. • Understanding the HF jets is the first step to derive the new calibration. • To be understand: • What is PF jet in HF? • What kind and how much correction on HF jets before JEC? • What makes PF jet different than Calo jet in HF? • Suggestions are welcome.

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