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Tracey BerryTAPM Meeting June 25 th e-gamma Triggers e5 e10 g10 e10i g10i e15 g15 e15i g15i e20 g20 e25 G35 Em40 E20i G20i E25i G30i e60 Exotics group generally interested in the higher pt trigger thresholds
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Tracey Berry TAPM Meeting June 25th 2007
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Triggers
Tracey BerryRoyal Holloway
Tracey Berry TAPM Meeting June 25th 2007
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Outline• Feedback & Suggestions on 1031 trigger Menu for the
Exotics Grouphttps://twiki.cern.ch/twiki/bin/view/Atlas/L31TriggerMenu
– e/gamma Triggers– Muon– Jet, Sum Et, Met– Tau Triggers– Combined Triggers– Summary
Tracey Berry TAPM Meeting June 25th 2007
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e-gamma Triggers• e5• e10• g10• e10i• g10i• e15• g15• e15i• g15i• e20• g20• e25• G35• Em40• E20i• G20i• E25i• G30i• e60
Exotics group generally interested in the higher pt trigger thresholds
Tracey Berry TAPM Meeting June 25th 2007
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e-gamma Triggers• e5• e10• g10• e10i• g10i• e15• g15• e15i• g15i• e20• g20• e25• G35• Em40• E20i• G20i• E25i• G30i• e60
Isolated triggers give poor efficiency for high pt electrons and photons
L1 L22e15i 52.2 39.5e25i 89.8 84.7e60 100 97.3
G(500 GeV)->eeTrigger eff in % after kine cuts of 2 electrons in ||<2.5
Add plot
Worse for 2e*i triggers than e*1 triggers
Tracey Berry TAPM Meeting June 25th 2007
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e-gamma Triggers: g60?• e5• e10• g10• e10i• g10i• e15• g15• e15i• g15i• e20• g20• e25• g35• em40• e20i• g20i• e25i• g30i• e60
Is there going to be a g60 trigger? This is the most efficient trigger for the Z’ and G searches in ee and gg channel?!
• Z’(1000)ee (DS 5605) in % after kine cuts (2 electrons in ||<2.5)• Very similar performance as for Gee
trigger EF* trigger L22e15i 88.7 2g20i 12.9e25i 52.1 g60 96.9e60 95.4
trigger EF2g20i 41.7g60 97.1
From Monika Wieler’s talk 21/3/07
• G(500) event with two gamma in ||<2.5 (DS 5623)
Change table to one from Matthew’s talks
g60 trigger more efficient than e60 for high mass (500 GeV) Z’/G samples
Tracey Berry TAPM Meeting June 25th 2007
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e-gamma Triggers: loose e60/e120?• e20• g20• e25• g35• Em40• e20i• g20i• e25i• g30i• e60
Prehaps in future also would like a loose e60 trigger and or a non-prescaled e120 (just ET plus track in front of calo) and/or g120 trigger (for Z’/G searches) with no isolation
g60 trigger more efficient than e60 even for high mass ee samples: The EF cuts for e60 may be somewhat tight for high Pt ePrehaps could drop the track requirement for electrons.
•e60 - e60 and g60 trigger for G/Z’/T-> ee/ gg and most Exotics searches involving a high pt lepton
Tracey Berry TAPM Meeting June 25th 2007
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e/gamma trigger Summary• 1) We need a NEVER-TO-BE-PRESCALED single e and photon
trigger
• If there is an e60 – does it mean that the e25 rate is expected to be such that a prescale will be necessary?– If so we also need a g60 (or g40 – whatever will have a rate
allowing it to run unprescaled for the lifetime of the trigger list)
Tracey Berry TAPM Meeting June 25th 2007
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2 object e/gamma Triggers• 2e5• e5_e10• 2e10• 2g10• 2e10i• 2g10i• 2e15• 2e15i• 2e20• 2e20i – Z’/G->ee poor efficiency due to isolation constraint – even
worse requiring 2 isolated electrons than for single object trigger
• e20_XE15
Add plot here for 2e25i
Probably use single e/g triggers rather than double for most exotics searches
Tracey Berry TAPM Meeting June 25th 2007
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Muons Triggers• MU4• MU6• MU10• MU15• MU20• MU40 – good for Z’/G , T ->mm, leptoquark searches
• 2MU4• 2MU6• 2MU10• 2MU15• 2MU20
Tracey Berry TAPM Meeting June 25th 2007
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Jets/Sum Jet ET/MET• L1_TE100• L1_TE200• L1_TE304• L1_TE380 -----
• L1_JE20• L1_JE80• L1_JE172• L1_JE256 - unprescaled
• L1_XE12• L1_XE20• L1_XE24 • L1_XE32• L1_XE36• L1_XE44• L1_XE52• L1_XE72
Prescaled so not so good for black holes
Not prescaled so good for black holes in combination with/OR’ed with other high pt lepton triggers and MET
-> good for Monojet search: combine Jet+MET
Prescaled so not so good for leptons+MEt searches
Not prescaled: so good for leptons+MEt searches:signal 50 GeV lepton+ 50 GeV MET.
Typical trigger combined: lepton+MET (e60 and mu20 or mu40)Or jet +MET (MET only triggers require too high thresholds)
Useful for black holes?! – or too much QCD bkgd?
Jet triggers useful for background studies
Tracey Berry TAPM Meeting June 25th 2007
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Single Tau TriggersPS
• Tau10 -• Tau10i -• Tau15 150?• Tau15i 60• Tau15itau15i_PT 7000 • Tau20i -• Tau25i -• Tau35i 2• Tau45 1• Tau45i -• Tau60 -
Prescaled triggers not useful for searches
For Z’ tau tau
Tracey Berry TAPM Meeting June 25th 2007
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Double Tau Triggers• 2tau10i• 2tau15i• 2tau15i_PT• 2tau20i
• Tau10i_tau25i• Tau10i_tau35i
• Tau10i_MET40• Tau15i_MET32• Tau15i_MET20• Tau25i_MET20• Tau35i_MET20• Tau35i_MET40
• Tau10i_e10i• Tau15i_e10i• Tau10i_e15i
• Tau10i_mu6• Tau10i_mu10• Tau15i_mu6• Tau15i_mu10
• Tau10i_jetXX• Tau15i_jetXX• Tau15i_jetXX• Tau15i_bjetXX
Are these triggers useful to us? – they are not prescaled
Would we use these for Z->tautau
Or any leptoquark searches – if so which ones?
Tracey Berry TAPM Meeting June 25th 2007
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Combined Triggers
Leptoquarks
•Why is there a mu-jet and no e-jet? - also wanted for leptoquarkse.g. MU20_J40 and e20_J40 ?
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Combined Triggers
Any of these of interest to us?
Black holes?
•Is there an e-mu trigger?Would e10_mu6 have too high rate?
Tracey Berry TAPM Meeting June 25th 2007
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Combined Triggers• Another suggestion is: "A high multiplicity trigger with at least 3
objects (EM,MU,TAU,JETs) above 200 GeV?“
• Black holes – which combined triggers would we use?
• Leptoquarks – which combined triggers?•
• Print picture of combined triggers – don’t type out!
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Summary
• Is g60 going to be on the menu?
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BACKUP
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Example for tau trigger• Example: Z’(600)• Efficiency for selecting events
with two taus in ||<2.5
• To get to the trigger efficiency I didn’t do the ‘correct’ thing. I combined tau25i+L1_XE30 instead of tau25i+met40
• Might need high pT unisolated tau threshold as for e/ for the very high pT taus?
trigger EF*Tau25i+XE30 53.2e25i 16.7e60 37.5Mu20i 20.2J160 54.22j120 30.63j65 11.7
Needs investigating?
Tracey Berry TAPM Meeting June 25th 2007
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More on electrons:
• Eff for e60 after L2 ~80% for ET>66-68GeV, should be ~90% for this trigger
• Loose IsEM has =88.1%• trigger looses (L1+L2) w.r.t. IsEM for
ET=60GeV electrons– Loose: 85.8% (losses mainly due
to ET threshold cut)• Warning: e25i uses isolation at L1, it
becomes inefficient for very high pT electrons, so look at e60 instead
• Last year we proposed a loose e60 trigger or/and a very loose e120 trigger (just ET plus track in front of calo) and asked for feedback
– You should have a look at these issues and tell us what you prefer!
ET(gen) (GeVEff for e25i after EF (%)
Eff for e60 after L2 (%)
25 63.2 n/a60 76.7 72.8120 72.5 83.9500 12.7 79.71000 1.2 79.4
We, e in ||<2.5, ET>25GeV)
e25i
From Monika Wieler’s talk 21/3/07
Has this been done?
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DiBosons WZ -> jj ll 2e15i, e25i, e60, mu20, 2j120, j160 Possible combined triggers: 2e20i + 2j40 + 2fj15 : 2mu20 + 2j40 + 2fj15 WZ, WW -> lv jj e25i, e60, mu20, 2j120, j160, j45+xE50 combined e20i + 2j40 + xe40 + 2fj15 :
mu20i + 2j40 + xe40 + 2fj15 WZ -> lv ll 2e15i, e25i, e60, mu20 combined 3e20i + xe40 + 2fj15 :
3mu20i + xe40 + 2fj15 :2e15i + mu15i + xe40 + 2fj15 : 2mu15i + e15i + xe40 + 2fj15
ZZ, WW -> 2 l + 2 v's 2e15i, e25i, e60, mu20 combined: 2e20i + 2fj15 : e20i + mu20 + 2fj15 : 2mu20 + 2fj15
Are investigating different topologies of VB scattering. In every case, we have forward jets. We include combined triggers very specific to these analyses, in case we can add them.
* Issues: For the signals with W->jj, the combined triggers always rely on the presence of 2 jets. We might also end up with one single jet.
* The use of 2fj15: requires investigation - we might have significant model-dependent systematics, if we are not careful.
* Should we have 2 different combined triggers, one for very high mass and one for lower mass?
Tracey Berry TAPM Meeting June 25th 2007
21James Frost – Cambridge ATLAS CSC BH Note Meeting
Triggers for Black HolesPrevailing wisdom is the Black Holes easily pass triggers, esp. jet onesA preliminary look at trigger efficiencies for BH:
L1 L2 EFJet160 100 100 1002jet120 - - 99.963jet65 99.97 99.89 99.844jet50 99.71 99.53 99.44e60 100 (EM
60)49.6 28.85
g60 100 (EM 60)
63.7 41.28
mu20i - 45.36 40.75met 99.55 (XE
50)100 (met10)
100 (met10)Black Holes do pass jet triggers – could “AND” all the jet triggers
Electron/muon/gamma triggers less efficient – search for these at analysis level Do we need a dedicated/higher energy jet trigger?