Tracey BerryTAPM Meeting June 25 th 2007 1 Triggers Tracey Berry Royal Holloway

Tracey Berry TAPM Meeting June 25th 2007

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Triggers

Tracey BerryRoyal Holloway


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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


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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


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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


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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


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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


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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)


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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


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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


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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


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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


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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?


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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?


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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?


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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?


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?

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Tracey BerryTAPM Meeting June 25 th 2007 1 Triggers Tracey Berry Royal Holloway