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At the bottom of this page there are some useful lines of code needed to declare appropriate variables and retrieve the bits, and write the variables to a ntuple.
On the Trigger and Filter Efficiency AWG Homepage you can find links to pages in development describing the various filters. Currently, the filter names on these pages are the old ones, but they are similar enough to the actual names that one can make an easy correspondance.
Digi Filter FlagsThese flags are set at the digitization (digi) level. |
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| Nano-Database Variable Name | Description | |
| DigiFL1Prescale | A sample of events that have passed Level-1 trigger, with no other requirement. For example, these events do not have to pass the Level-3 trigger, so they events can be used to study the Level-3 trigger (e.g., for efficiency and bias). | |
| DigiFL3OutDchEmcPreVetoPrescale | Events that pass the L3 Dch or Emc selection *before* the Bhabha veto is applied | |
| DigiFL3Prescale | A sample of events that have passed Level-3 trigger, with no other requirement. These events do not have to pass any of the physics filters, so they can be used to study those filters. | |
| DigiFRandomPrescale | ||
| DigiFBhabhaFlat | Bhabha events that have been flattened in theta, to provide a more uniform theta distribution. This is done to reduce the number of Bhabha events with small angles, since they are extrememly copius. | |
| DigiFRadiativeBhabha | A filter designed to pass radiative Bhabha events. | |
Background Filter FlagsNB: The ChargedTracks and CalorNeutral lists that most analysts know well are not available at this stage of the reconstruction, so the cuts below cannot be replicated in your analysis (at least for now). The charged tracks and neutral objects used to create the flags are similar to, but not identical to, the final reconstruction objects. P1 and P2 correspond to the highest and 2nd highest momentum charged tracks. E1 and E2 correspond to the highest and 2nd highest energy neutral clusters. |
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| Nano-Database Variable Name | Description |
| BGFMultiHadron | # Charged Tracks > 2 R2 < 0.98 |
| BGFMuMu | P1>4 GeV P2>2 GeV 2.8>Theta1+Theta2>3.5 E1+E2<2.0 GeV |
| BGFTau | # Charged Tracks = 2 Event Charge = 0 P1+P2<9 GeV E1+E2<5 GeV E1/P1 or E2/P2 < 0.8 energyCM-P1-P2>0 (Pt1+Pt2)/(energyCM-P1-P2)>0.07 |
| BGFTwoProng | # Charged Tracks = 2 Event Charge = 0 P1 or P2>1 GeV E1 and E2<3 GeV cosmic rejection: |cosThetaP1+cosThetaP2|>0.1 require EMC for high momentum track: cosThetaP1>-0.75 high momentum track or Pt balance: P1 or P2 > 4 Gev OR |Pt1-Pt2|<0.3 |
| BGFGammaGamma | # Charged Tracks = 0 # EMC Clusters >= 2 E1 > 4 GeV E2 > 2 GeV |thetaE1 + thetaE2 - Pi| < 0.2 |Sin(PhiE1-PhiE2)| < 0.2 |
| BGFGammaGammaPrescale | |
| BGFPhiGamma |
2 < # Charged Tracks < 5 1 Isolated Photon: __ 4 GeV < Ephoton < 6 GeV __ all tracks satisfy: cos( TrkPhi - PhotonPhi) < 0.8 2 tracks in opposite hemisphere with invariant mass consistent with Kshort->PiPi or Phi->KK |
AbsEventTag* tag = Ifd<AbsEventTag>::get( anEvent ); bool l3Prescale(false); bool l1Prescale(false); bool rndPrescale(false); bool bhaPrescale(false); bool radBhabha(false); bool hadron(false); bool mumu(false); bool tau(false); bool twoProng(false); bool gammaGamma(false); bool phiGamma(false); tag->getBool(l3Prescale,"DigiFL3Prescale"); tag->getBool(l1Prescale,"DigiFL1Prescale"); tag->getBool(rndPrescale,"DigiFRandomPrescale"); tag->getBool(bhaPrescale,"DigiFBhabhaFlat"); tag->getBool(radBhabha,"DigiFRadiativeBhabha"); tag->getBool(hadron,"BGFMultiHadron"); tag->getBool(mumu,"BGFMuMu"); tag->getBool(tau,"BGFTau"); tag->getBool(twoProng,"BGFTwoProng"); tag->getBool(gammaGamma,"BGFGammaGamma"); tag->getBool(phiGamma,"BGFPhiGamma");
