Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Muon Event Filter Stefania Spagnolo Dip. Fisica, Univ. Lecce e Sezione INFN, Lecce on behalf of the Muon HLT working group

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Outline Brief reminder the requirements; the implementation; the studies so far Status of the TrigMoore package Performance on recent releases (focus on the End-Cap region) resolution and efficiency Trigger rates at the EF vs threshold Plans sw developments and physics studies

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Brief reminder Physics and system Requirements EF must reduce the total data throughput to 200 Hz EF total latency ~ 1-2 s P T reach of the lvl1 muon trigger  5 GeV/c (lower limit) Muon rate is dominated, at low pt, by decays in flight of light mesons, b and c quarks LVL1 muon rate for p T > 6GeV  cm -2 s -1 Cavern background and pileup at high luminosity are a source of fake muons Physics needs high efficiency and selectivity, flexibility in order to cope with different background scenarios The implementation TrigMoore: an interface to the HLT Steering for the offline muon reconstruction algorithms: MOORE and MuId

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week LVL2 (muFast) Moore Algs LVL1 MuIdStandAloneAlgs TrigMoore Seeding Algs MuIdCombinedAlgs Hypo Alg Brief reminder TrigMoore: a schematic view Two different running modes:Seeded Reconstruction performed only in the geometrical regions provided by the RoIs of previous levels. Full scan Full reconstruction, ~equivalent to the offline working mode Full functionality in barrel and end-caps Seed can come from LVL1 or LVL2 ESD and AOD from the muon EF available Thanks to the ID tracking group; particularly to Alan Poppleton (iPatRec default ID reco)

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Brief reminder Status at the last T&P week from the side of the algorithm: TrigMooreHypo – first implementation developments for muon EF output in ESD and AOD; validated by comparing TrigMoore AOD with Moore AOD in the same job (11.0.5) (slightly out of the scope of HLT) MuId migrated to use as input the generic track object: Trk:Track; Allows to choose among different reconstruction algorithms in the ID From the side of the performance: timing measurements on single muons with pile-up and nominal cavern background (400 ms average, 500 ms RMS) – room for improvement ! trigger rates estimated in the BARREL shown at the March T&P week (on Rome-workshop data) confirmed by with more recent simulation samples and software suite studies of fakes at high luminosity

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Status of the TrigMoore package

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Moore Algs MuIdStandAloneAlgs Seeding Algs MuIdCombinedAlgs Hypo Hypo Hypo Status of the TrigMoore package Seeding Algorithms assume the seed is a MuonFeature (from LVL2) or a LVL1 roi (seed from LVL1) 3 istances of TrigMoore called by the steering, for reconstruction in the MS, extrapolation to the IP and combination with ID tracks, allow hypo algos to be run at each step (if requested) TrigMoore records in the TE history a MooTrackContainer or a MuidTrackContainer for each seeding ROI and they are accessed by TrigMooreHypo for p T test TrigMoore records all reconstructed tracks in the event in a single container in StoreGate for conversion in Trk:Track format and subsequent output in ESD and AOD in

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Status of the TrigMoore package Seeding Algorithms assume the seed is a MuonFeature (from LVL2) or a LVL1 roi (seed from LVL1) 3 istances of TrigMoore called by the steering, for reconstruction in the MS, extrapolation to the IP and combination with ID tracks, allow hypo algos to be run at each step (if requested) TrigMoore records in the TE history a MooTrackContainer or a MuidTrackContainer for each seeding ROI and they are accessed by TrigMooreHypo for p T test TrigMoore records all reconstructed tracks in the event in a single container in StoreGate for conversion in Trk:Track format and subsequent output in ESD and AOD a problem for the integration in the online not very flexible: for will separate into 3 packages Trigger Aware analyses can use the muon EF result by looking at the AOD/ESD content but cannot run the hypothesis algos on AOD

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week First use of the TrigRoIDescriptor for the online integration and for running more general sequences (seed can come from whatever LVL2 HLT algorithm) new tag (TrigMoore ) collected in 12.0.X and LST Allow running the hypothesis algorithm on AOD will be in Convert Moo(Muid)Tracks into Trk:Track for each ROI and assign KEY2KEY to each of them in order to allow navigability Change input toTrigMooreHypo (to Containers of Trk:Track) Ongoing work to increase modularity: we’ll have 3 HLTalgos instead of 3 instances of TrigMoore by Online integration problem in the retrieving of L2Result information from ByteStream solved with the use of the TrigRoIDescriptor jobOptions for the online works fine in the offline; tested in the online (athenaPT) OK Event Filter seeded by LVL1 under test Also preliminary check for pre-series tests OK next week the Large Scale Test will start – TrigMoore there ! Status of the TrigMoore package

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Performance on recent releases

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Performance on recent releases Blue = MOORE, for tracks with  2 <3 Red = MuidSA, for tracks successfully fitted Pink = MuidCB, for tracks successfully fitted No relevant bias within statistical errors  Check p T rec / p T gen vs  MEAN (of a gaussian fit) shows reconstruction biases SIGMA gives relative p T resolution The Sample Single muons with fixed p T between 2 and 75 GeV/c CSC production with Athena (Napoli Tier2 + CERN); Muon Layout Q02 Reconstruction in Athena , TrigMoore seeded by LVL1 skip LVL2 in order to test EF coherently in barrel and endcaps Pretty stable with p T

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Performance on recent releases   p T )/p T vs  Expected trend observed: degraded resolution in the transition region between the barrel and endcap toroidal fields  p T )/p T vs  Relative p T resolution as a function of  from  (p T rec/p T gen) p T = 8 GeV/c p T = 40 GeV/c

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week MOORE MuidSA MuidCB Performance on recent releases Relative p T resolution as a function of p T from  (p T rec/p T gen) stable compared to results in previous releases p T = 8 GeV/c

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Moore Efficiency ETA PHI Performance on recent releases inefficiencies in the feet region Efficiencies are defined wrt LVL1 accepted muons edge at  = 2.4

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Efficiency vs p T Performance on recent releases Under investigation: - tighter cuts in the machting account for ~2 % eff. loss - no obvious trend with  and  - what else ? plan to fix by Blue = MOORE, for tracks with  2 <3 Red = MuidSA, for tracks successfully fitted Pink = MuidCB, for tracks successfully fitted Moore, MuidSA OK Unexpected efficiency loss (5%) of MuidCB compared to MuidSA similar behaviour in the offline package (efficiency wrt MC-truth)

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Trigger Rates

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Trigger Rates Rates at the EF can be estimated by folding cross sections with Efficiency of LVL1 for a given p T threshold Efficiency of LVL2 w.r.t. LVL1 seed (skipped, i.e.  ) Efficiency of EF w.r.t. seeding algo (LVL1 in this study) The effect of skipping the LVL2 selection step: test in the barrel rates LVL1+EF increase by  10% for mu(6) with respect to LVL1+LVL2+EF  30% for mu(20) deserve detailed study

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week First exercise to look at rates at p T thresholds different than the typical scenarios: 6 and 20 GeV/c Trigger rates Luminosity set to cm -2 s -1 Typical scenarios: mu(6) 3.0 kHz mu(20) 25 Hz efficiencies for LVL1 from F. Conventi for 6, 8, 10 GeV/c (in good agreement with our estimates) our estimates for 11, 20, 40 GeV/c

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week First exercise to look at rates at the EF in the END CAPS and vs p T thresholds Trigger rates Luminosity set to cm -2 s -1 Typical scenarios: mu(6) 3.1 kHz mu(20) 27 Hz cm -2 s -1 Barrel + EndCap EF cm -2 s -1 mu(6) 6.1 kHz mu(20) 52 Hz Efficiencies for LVL1 from our estimate maybe slightly inaccurate for the known bugs in TGCCabling expected effects at EF <10%

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Trigger Rates Muon sources 5 GeV/c threshold kHz 6 GeV/c threshold kHz  /K b c W0.003 tnegligible Total 6.9 kHz 3.0 kHz Rate for mu(5) at the EF in the barrel use LVL1 efficiency for the barrel with the trigger re-configured to have 5GeV/c as lowest threshold Luminosity set to cm -2 s -1

Stefania.Spagnolo, Dip. Fisica, Univ. Lecce CERN, Nov. 2006, ATLAS Trigger and Physics week Conclusions TrigMoore provides the requested functionality of the muon EF from the sw architecture point of view (increasing modularity, compliant with trigger aware analysis needs) follow up the successful Moore migration to the new EDM plan to follow up the successful Moore migration to the new EDM from the physics performance point of view (but room for refinements exists !) First exercise to provide rates vs threshold: input for the definition of trigger menus integrate the LVL2 (standalone and combined) in the chain Plans revise studies with cavern background and pile-up revise studies of rejection of muons from  /K decays dedicated CSC simulations requested pursue timing optimization