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W→τν Note & Tau candidates in first data

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Presentation on theme: "W→τν Note & Tau candidates in first data"— Presentation transcript:

1 W→τν Note & Tau candidates in first data
Lidia e Attilio ATLASMi – 22nd December 2009

2 W→τν Note Prospects for Studying W→τhadν Decays with ATLAS Data corresponding to an Integrated Luminosity of 100 pb−1 it should be submitted as COM today will ask for INT approval at the beginning of January I studied the QCD di-jet background. The full simulated QCD background samples available are not enough to evaluate the contribution to the analysis from this background. On the other side, the fast simulated samples have two problems: no trigger information is available the missing Et spectrum in fast and full simulation is different. I studied how to: correct the fast samples for the trigger efficiency correct the missing Et spectrum

3 W→τν Note – Event Selection
it is important to estimate QCD background from data.

4 Extracting QCD from data

5 Samples MonteCarlo: mc09_900GeV pythia_minbias.merge.AOD.e466_s604_s582_r871_r879 (day1 conditions) mc09_900GeV pythia_minbias.merge.AOD.e466_s604_s582_r873_r879 (day100 conditions) Data(*): only some LumiBlocks from data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f190_m311 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f195_m326 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f189_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f188_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f188_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f187_m305 data09_900GeV physics_MinBias.merge.DESD_COLLCAND.f187_m305 (*) good data has been selected using the AtlasRunQuery Release some packages for D3PD production (see backup)

6 GoodRunList decide a list of good runs (→atlas-runquery →GoodRunList)
Pixel and SCT ON Solenoid ON data at 900 GeV run on DESD_COLLCAND to produce D3PD run the same code on MonteCarlo to produce D3PD D3PD produced privately we are in touch with D3PD developers, to add all the variables we need then D3PD will be produced centrally will produce new D3PD after Christmas reprocessing

7 Some very preliminary plots…
Loose SafeLoose SafeCaloLoose Medium SafeMedium SafeCaloMedium Tight SafeTight SafeCaloTight number of reconstructed taus for different identification levels (→ Note ATL-PHYS-INT ) “SafeCalo“ variables based on calorimetric variables “Safe“ variables based on calorimetric and tracking variables quite good agreement, except for “Safe” variables…

8 Tau Nprong for different identifications
reconstructed taus no cuts applied different number of reconstructed taus in Data and MC on the same number of events

9 Backup

10 W→τν Note - Index

11 W→τν Note - Index

12 D3PD – technical details
to produce D3PD, check out and compile: JetD3PDMaker-r252088 MinBiasD3PDMaker MissingETD3PDMaker TauD3PDMaker-r254873 TrackD3PDMaker MissingETGoodness MissingETPerformance DATA EventDetails (EventNumber, lbn...) electrons, photons, muons (StacoMuonCollection) jets (Cone4H1TopoJets, Cone4H1TowerJets, AntiKt4H1TopoJets…) missingET (RefFinal, Final, Topo, Base…) taus (TauRecContainer) tracks and vertexes (primary, conversions) MC: DATA + ... missingET: truth no trigger info for the moment all the other truth information have just been added in the D3PDMaker package

13 Atlas Run Query make your selection: time run duration
number of events collected data type (900GeV or 2(!)TeV) beam conditions (stable beam, number of bunches, beam energy, fill number...) magnets detectors in the data taking data quality trigger ... AtlasRunQuery gives a list of runs (and lumi block) with the selected conditions It is possible to download “GoodRunList” as an xml file to be used by the analysis

14 Atlas Run Query http://atlas-runquery.cern.ch/ Tool to:
look for all the useful information about runs and data quality define a GoodRunList My selection: time: from 24 Nov 2009 solenoid ON DataQuality for pixels and SCT green N.B. In the pixel dq green flag there is no request that the preamplifiers are not killed (with no stable beam HV is OFF and preamplifiers killed), so some data may not be optimal anyway, due to transition...

15 Atlas Run Query xml file

16 NTau MC DATA Events with Taus 1502 Events with Taus 2120 Taus 1734
Taus CutLoose Taus CutMedium 313 Taus CutTight 93 Taus CutSafeCaloLoose Taus CutSafeCaloMedium 270 Taus CutSafeCaloTight Taus CutSafeLoose Taus CutSafeMedium Taus CutSafeTight DATA Events with Taus Taus Taus CutLoose Taus CutMedium Taus CutTight Taus CutSafeCaloLoose Taus CutSafeCaloMedium 250 Taus CutSafeCaloTight Taus CutSafeLoose Taus CutSafeMedium Taus CutSafeTight

17 Tracking variables for SafeTaus
reconstructed taus no cuts applied different number of reconstructed taus in Data and MC on the same number of events Tau_etOverPtLeadTrk Tau_EtHadsumpT

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