Release Notes for 31x (changes wrt 21X / 22X)

New trigger menus

In this release we have retired the old, 160-HLT-path menu in favor of two, leaner menus. The new menus is the outcome of the Winter 09 Trigger Reviews which were carried out in collaboration with the Physics Coordination and focused on two reference luminosities

  • 8E29, corresponding to a menu for "Day 1" of LHC collisions with the loosest possible requirements
  • 1E31, corresponding to a "2010" exercise with MC-tuned cuts

Documentation on the new menus can be found here.

Major changes

  • Many of the triggers in the old menu have been replaced by more inclusive triggers
  • We have introduced new Ht and MHt triggers.
  • We have introduced new alignment triggers.
  • We apply a flat 0.7 correction in HF for jet energies in the 8E29 menu but no other correction. (We still apply the eta-dependent, MC-driven corrections on the jets in the 1E31 menu)
  • We have updated the L1 menus for the two reference luminosities (8E29: startup scales, no eta-dependent jet corrections, 1E31: nominal scales, eta-dependent jet corrections)

Behind-the-scene changes

  • We have switched to a more direct "RAW to RecHits" approach for the ECAL unpacking which facilitates the regional unpacking and reconstruction at HLT and fixes some reproducibility issues in 21x / 22x.
  • We have implemented regional unpacking for the Preshower
  • Algorithm changes
    • Egamma paths: Have switched to "jurassic" isolation, and introduced EleId-based criteria

Compatibility between L1 and HLT menus:

The available L1 menus are detailed on the dedicated L1 twiki page GlobalTriggerAvailableMenus.
The 8E29 HLT table is to be used together with the L1Menu_Commissioning2009_v3, which implements startup scales.
The 1E31 HLT table is to be used together with the L1Menu_MC2009_v2, which implements lumi1031 scales.

Other things to keep in mind

None, at the moment.

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Topic revision: r3 - 2009-07-12 - AndreaBocci
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