U.Gasparini CMS week, 6/12/01 1
µ-HLT selection
L1/L2/L3 trigger path to DAQ output:
- assumed DAQ scenario
- single µ stream: L1 (GMT) ->L2 ->L3 (in some detail)
- µµ=stream
- µ+X streams: L1-> L2 (very preliminary)
CMS week, 6 Dec 2001
Contributors: M.Konecki, N.Amapane, S.Arcelli, N.NeumeisterM.Fierro, H.Sakulin, A.Fanfani
U.Gasparini, INFN Padua
U.Gasparini CMS week, 6/12/01 2
µ-HLT selection
Assumed DAQ scenario:
50 KHz DAQ scenario => 16 KHz total bandwidth
4 KHz µ+µµ L1 output1.5 KHz µ+X “ “ (X= e, τ−jet, jet, ETmiss, ΣET )
Luminosity: 2 x 1033cm-2s-1
U.Gasparini CMS week, 6/12/01 3
90% efficiency curves
3550. Hz
Threshold:
Rate:
L1: Global Muon Triggeroutput
ε=pT> 14 GeV/c
L1
W → µν
εL1(W → µν)===0.85=⋅ εacc
0.85
(normalized to geom.acceptance)
Single µ stream
H.Sakulin
N.Neumeister
14.0.57
U.Gasparini CMS week, 6/12/01 4
Single µ stream (II)
L2 recostruction:pT resolution improved
L1 L2σ(pT/pT) = 30% → 10%
14.
900.300.
with pixelwith calo energy
300. Hz
900. Hz
500. Hz
εL2(W → µν)===0.77⋅εacc
εL2(W → µν)===0.75⋅εacc
M.Konecki
Isolation @ L2 :
QCD backg.
U.Gasparini CMS week, 6/12/01 5
Single µ stream (III)
L3 recostruction:pT resolution improved
L2 L3σ(pT/pT) = 10% → 2%
22.
70.
εL3(W → µν)===0.62⋅εacc
70. Hz
pT> 22 GeV/cThreshold:
Rate:
(memo: try to recover b-physicsafter L2 in the 14-22 GeV region;NOT for this round...)
N.Neumeister
QCD backg.
U.Gasparini CMS week, 6/12/01 6
Single µ stream (IV)L3 selection: pT
thresh=22 GeVPhysics content of surviving events:
b/c → µ
K/π → µ
W → µν
Pixel isolation suppress residual b/c component
22.
70.
10.
εL3(W → µν)===0.55⋅εacc
M.Konecki
N.Neumeister
10. HzRate:
QCD backg.
(QCD backg. only)
U.Gasparini CMS week, 6/12/01 7
Single µ stream (V)N.B. Optimization study in L3 → L3+Pxiso yet to be done, i.e.:
move here
move hereIn next Table, rather arbitrary point (εW, pT
thres)= (0.90, 22.) chosen...
(Px isolation)
U.Gasparini CMS week, 6/12/01 8
Single µ stream: summaryL1 L2 L2+iso L3 L3Pxiso
pT (GeV) 14. 14. 14. 22. 22.Rate(Hz) 3600. 900. 500(calo) 90. 24.
300(pixel)ε=(W ->µν=)= 0.85 0.78 0.75 0.55 0.50 ε=( t->Wb->µνX) 0.93 0.88 0.84 0.73 0.66ε=( H200->ττ->µX ) 0.77 0.70 0.67 0.53 0.48ε=( Z->µµ==)= 0.99 0.98 0.94 0.94 0.93 ε=( H120->2µ2ν ) 0.96 0.93 0.90 0.76 0.75
W : 11 HzZ : 1 Hz
b/c → µ: 10 HzK/π→ µ:= 2 Hz
t → Wb → µνXε=
A.Fanfani
L3
L2L1
efficiencies must be multiplied bygeometrical acceptance (=εacc= 0.57 for W → µν,==0.92 for H → ττ=)
** all numbers are preliminary **
U.Gasparini CMS week, 6/12/01 9
µµ=stream
L1 GMT otput:
600 Hz
pTlow> 4 GeV
pThigh thres. ( GeV)
GMT
2µ from 1 QCD event1 µ + 1 ghost
2µ from 2 QCD events in same b.x.( 20% of rate; will be 50 % at 1034 :
new w.r.t. 2000: => remember: lower pT sample in MC generation)
H.Sakulin
U.Gasparini CMS week, 6/12/01 10
µµ=stream : summary
L1 L2 L3pT
(1),pT(2) (GeV) 4.5, 4.5 4.5, 4.5 4.5 , 4.5 10., 6. 12., 8.
Rate(Hz) 630 140 75 17 6.6 ±0.7
ε=( tt-> 2µX) (*) 0.80 0.71 0.55 0.46 0.35ε=( Z->µµ==)= 0.94 0.92 0.81 0.80 0.79 =ε=( H120->2µ2ν ) 0.90 0.85 0.73 0.70 0.62
=Total rate µ+µµ : 4100. 440. 30.
( memo: try to recover b-physics after L2 in the 4.5-10. GeV region (e.g. M(µ+µ-)...)
NOT for this round...)
Increm. rates
S.Arcelli, A.Fanfani,H.Sakulin
N.B inculsive channel (NOT tt mnmnbb)
U.Gasparini CMS week, 6/12/01 11
µ−X streams (I)Method:- Look at iso-rate & iso-efficiency curves in (pT
µ,OX) planes, where OX is any of the relevant observables ET
e, ETjet, ect...of object X
- Exclude events already triggered by corresponding single objects- Maximize ‘incremental’ efficiency on given benchmark channels
(e.g. H → ττ → µ-e, H → ττ =→ µ -tjet, tt → µ-jet,...) for given rate,then choise a working point in (pT
µ,OX) on the ‘optimal curve’
pTµ thres.
isorate
isoefficiency optimal curve
Events NOT passing L1 µand L1-τjet
M.Konecki
220.Hz
U.Gasparini CMS week, 6/12/01 12
µ−X streams (II)
Rather detailed studies on:
−µ-e topology
-µ-τjet
S.Arcelli, M.Konecki, M.Fierro
M.Konecki, A.Nikitenko
N.Amapane,M.Konecki
Very preliminary results on:−µ -jet- µ -ET
miss
- µ -ΣET
General remark:single object triggersalready quite good
playing with rathersmall incrementalefficiencies
e.g.: µ-e
N.Amapane
Single object thresholds
H → ττ → l X
U.Gasparini CMS week, 6/12/01 13
µ−X streams (III)
Many studies yet far for being optimized, e.g.:
Above isorate/isoefficiency curves may be used to trace the optimal line in the (efficiency,rate) plane
(pTµ,ET
jet)=(4., 60.)(15.,55.)
M.Konecki
L2+iso
pTµ=5.
pTµ=10.
pTµ=20.
tt →µ jet
U.Gasparini CMS week, 6/12/01 14
µ -X streams: summary (I)
L1 L2 L2.5ele
pT ,ET(GeV) 6., 13. 6., 13. 6., 13.Incremental rate(Hz) 280. 140. 20.
ε=( H200->ττ->µ=e )**, ∆ε 0.68, 0.02 0.51 0.44ε=( tt→µ=e )**, ∆ε 0.83, 0.10 0.55 0.20
L1 L2no thr. L2 L2.5pT ,ET(GeV) 10., 50. 0., 0. 10., 30. 10., 30.
Incremental rate(Hz) 220. 150. 3. ε=( H200->ττ->µτ )**, ∆ε 0.52, 0.02 0.50 0.37 0.29
µ-e
Single µ threshold : 16 GeV(*)Single e threshold : 20 GeV
(*) should be 14 GeV, for consistency with the above...(**) efficiencies include geom.acceptance
µ-τj
Single µ threshold : 16 GeV(*)Single τj threshold : 80 GeV
optimized point
optimized point
incremental efficiency
N.Amapane
M.Konecki
U.Gasparini CMS week, 6/12/01 15
L1 L2 L2+iso
pT ,ET(GeV) 4., 60. 4., 60. 4., 60. 15.,55.Incr. rate(Hz) 570. 530. 130. 10.ε=( tt→µ=X )**, ∆ε 0.75, 0.03 0.71 0.63 0.60
pT ,ET(GeV) 4., 28. 4., 28. 4., 28.Incr.Rate(Hz) 420. 170. 100 .
pT ,ET(GeV) 4., 160. 4., 160. 4., 160.Incr. Rate(Hz) 190. 180 35.
=Total rate µ+X 1680. 1170 290
=Total ∆ε=( H200->ττ->µX) ≈ 0.06
µ -X streams: summary(II)
µ-jet
µ-ET
µ-ΣET
Not yet optimized
M.Konecki
S.Arcelli
U.Gasparini CMS week, 6/12/01 16
µ -triggers: grand summary
=Total rate µ+µµ : 4100. 440. 30.
L1 L2+iso L3
14. 14. 22.4.5 4.5 4.5, 4.5 12., 8.
L1 L2 L2+iso L3
Thresholds:
- µ+µµ reasonably advanced and in good shape; basic tools are there, numbersstill **very** preliminary
- Lot of work needed in undestanding/optimizing/refining (up to L3) mixed topologies
=Total rate µ+X 1680. 1170 290 80
guess frompure µ studies,at same(low!: 4.5-10 GeV)L2 µ thresholds
