Jet Slice – use of TopoClusters Ricardo Gonçalo (LIP) and David Miller (Chicago) For the Jet Trigger Group Trigger General Meeting – 20 August 2014.

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Presentation transcript:

Jet Slice – use of TopoClusters Ricardo Gonçalo (LIP) and David Miller (Chicago) For the Jet Trigger Group Trigger General Meeting – 20 August 2014

Use of TopoClusters TopoClusters: – Essential to have performance close to offline – Good resolution wrt offline paramount to control rates Additionally: – TriggerTower full scan (L1.5) – Runs Anti-kT jet reco on 0.1x0.1 TriggerTowers – Avoids bias from close-by jets – Current plan is to run L1.5 to seed HLT reconstruction Could not test with L1.5 yet – But see Run I cost and performance in next slide 20/08/14TopoClusters in Jets - TGM 20/8/20142 L1.5

L1.5 cost From Run I tests ( see ATL-COM-DAQ ):ATL-COM-DAQ – L1Calo ROSes (3 for TT, 1 for JE) read out at up to 7kHz – Expect up to 15kHz with upgraded ROSes Total time around 12ms – Readout time around 9ms – Jet finding (anti-kT 0.4) around 1-2ms 20/08/14TopoClusters in Jets - TGM 20/8/20143

L1.5 performance The TriggerTower full scan recovers L1 inefficiency for close-by jets – See ATL-COM-DAQ ATL-COM-DAQ Reasonable spacial resolution Energy resolution same as L1 – See ATL-COM-DAQ ATL-COM-DAQ /08/14TopoClusters in Jets - TGM 20/8/20144

TopoCluster making and Partial vs Full Scan L1.5 code not working at present: partial results only – Partial scan seeded directly by L1 for now Latest numbers comparing partial scan vs full-scan of calorimeter cells, both using TopoClusters – Full-scan should have performance close to offline – Again, this is essential – cannot show direct comparisons now, but studies are ongoing Details: – MC sample: mc12 14TeV JZ2W: akT0.6 (truth); E T = GeV; = 80 – L1_J20 seed shown here L1_J50 also studied – Opening sRoI’s of 1x1 or 1.5x1.5 around L1 RoIs, 0.8x0.8 also studied 20/08/14TopoClusters in Jets - TGM 20/8/20145

TopoCluster performance Comparing PS to FS Assumes FS performance is closer to offline 20/08/14TopoClusters in Jets - TGM 20/8/20146 Ademar Delgado E T of 3 rd jet in 3j50 sRoI size 1x1 Events have David Freeborn (E T PS - E T FS )/E T FS versus η FS

TopoCluster making cost 20/08/14TopoClusters in Jets - TGM 20/8/20147 Ademar Delgado FS: ≈260ms PS: ≈28ms – L1_J20 1x1 sRoI PS: ≈45ms – L1_J20 1.5x1.5 sRoI FS: ≈10ms PS: ≈6ms – L1_J20 1x1 sRoI PS: ≈10ms – L1_J20 1.5x1.5 sRoI

Conclusions… so far TopoClusters essential for the jet trigger – The cost is high, but we believe the gains will be measured in physics – PS, L1.5, and the menu provide tunable parameters to minimize impact of processing time To-do (many things…): – Direct comparison with offline jets – Study performance of different calibration methods – both time and energy/position important – Using L1.5 to seed TopoCluster and jet finding – Optimisation of PS parameters: sRoI size, L1 seed – although reasonable values are now clear – Establishing menu after/in parallel with reconstruction options – Development: fixing some geometrical effects coming from RegionSelector, etc 20/08/14TopoClusters in Jets - TGM 20/8/20148

Backup 20/08/14TopoClusters in Jets - TGM 20/8/20149

Additional costs: Jet Calibration 20/08/14TopoClusters in Jets - TGM 20/8/ Signature coordination meeting – 20 Mar 14:

20/08/14TopoClusters in Jets - TGM 20/8/201411