1. μ̃ and ẽ and Analysis Status
Outline
μ̃ and ẽ Production Status
Efficiency and Momentum resolution, without γγ->h
Efficiency and Momentum resolution with overlay,
10 K μ̃ and ẽ used for first tests.
Summary
J-J.Blaising
J-J.Blaising, 18 April 2011
LCD WG6 meeting

2. μ̃ Benchmark Production Status
Process
σx Br fb
Events
generated L
fb⁻¹
Pre-sel
Mokka
Marlin
e⁻ e⁺-> μ̃⁻ μ̃⁺
0.7
5. 0x10⁴
70000
49980
Y/Y
SUSY-μ̃⁻ μ̃⁺
2.3
2.0x10⁵
3600
8200
e⁻ e⁺-> μ⁻ μ⁺
0.6
9 .0x10⁵
10600
6745
e⁻ e⁺-> μ⁻ μ⁺ ν̄ eνe
3.5
9.0x10⁵
13700
48500
e⁻ e⁺-> μ⁻ μ⁺ ν̄μ νμ
2.2
1.0x10⁵
16000
35000
e⁻ e⁺-> W⁻ W⁺ ν̄ ν
1.0x 10⁵
4800
264
e⁻ e⁺-> Z⁻ Z⁺ ν̄ ν
0.002
1800 5
Not needed
γγ -> μ¯μ⁺
2.45x10⁶
All events produced without overlay; DST 150k; 600 MB
20K μ̃ events produced with overlay; 100 evts/job; 7h; v0111Prod;
60MB/job; 130 k to produce if we would decide to overlay all events
J-J.Blaising, 18 April 2011
LCD WG6 meeting

3. ẽ Benchmark Production Status
Process
σx Br fb
Events
generated L
fb⁻¹
Pre-sel
Mokka
Marlin
e⁻ e⁺-> ẽ⁻ ẽ⁺ 6
2.0x 10⁴
3300
19990
Y/Y
SUSY-ẽ⁻ ẽ
2.3
2.0x 10⁵
3600
8200
e⁻ e⁺-> e⁻ e⁺ 80
6.0x 10⁶
870
74000
e⁻ e⁺-> e⁻ e⁺ ν̄ ν 90
2. 0x10⁵
1100
100000
e⁻ e⁺-> W⁻ W⁺ ν̄ ν
1.0x 10⁵
4800
264
e⁻ e⁺-> Z⁻ Z⁺ ν̄ ν
0.002
1.0x10⁵
1800 5
Not needed
6.6x10⁶
All events produced without overlay
20K ẽ events produced with overlay; 100 evts/job; 13h; 60 MB
180 k to produce if we would decide to overlay all events
J-J.Blaising, 18 April 2011
LCD WG6 meeting

4. Efficiency and Momentum Resolution Definitions
Reconstruction Efficiency: ε
ε = Nevt (2 good reconstructed L) /Nevt (2 generated L)
Good L : RPFO matching in space and ID the TPFO (McParticle)
Momentum Resolution:
δP(L) /P(L)*P(L) ;P(L) = Lepton momentum after FSR or
bremsstrahlung; δP = P(generated)-P(reconstructed)
FSR/Bremsstrahlung E correction when Eγ > 3x2 10¯⁵xP² (new
since meeting, essential for ẽ and against γγ background)
photons or e-,e+ pairs are combined with the closest lepton;
δPv(Lv) /P(Lv)*P(Lv) ; P(Lv) = Lepton momentum at Vertex
δPv = P(generated)v-P(reconstructed)
Without FSR or Bremsstrahlung correction δPv asymmetric tail
J-J.Blaising, 18 April 2011
LCD WG6 meeting

5. μ̃ and ẽ: dN/dP No Overlay
-μ:Efficiency ~ 99.7 %; No P dependence (~No Bremsstrahlung)
-e:Efficiency ~ 98.6 %; P dependence ( Bremsstrahlung)
J-J.Blaising, 18 April 2011
LCD WG6 meeting

6. μ̃ and ẽ: dN/dPv, No Overlay
-μ: with FSR correction; no P dependence
-e: with FSR and Bremsstrahlung correction; some inefficiency at high P (improve?)
J-J.Blaising, 18 April 2011
LCD WG6 meeting

7. μ̃ and ẽ: dN/dθ No Overlay
-μ: No θ dependence; s channel only
-e: No θ dependence; s and t channel; more events in F/B regions
J-J.Blaising, 18 April 2011
LCD WG6 meeting

8. μ̃:dN/(δP/P*P) and dN/(δPv/Pv*Pv)
δP/P*P = 2.0x10¯⁵
δPv/Pv*Pv = 2.5x10¯⁵ (two sides tail; un/overflow, ~0.5 % )
δP/P*P = ΔX √ (K /N+4) /(0.3 BL² sinθ ) PDG parametrization
K~720, B=4, L= F1(θ) , N=F2(θ) ΔX~50.10¯⁶ m
Parametrization can be used for the momentum distribution fit . Momentum resolution in agreement with the assumption made for the work done at generator level
J-J.Blaising, 18 April 2011
LCD WG6 meeting

9. ẽ: dN/(δP/P*P) and dN/(δPv/Pv*Pv)
δP/P*P ~ 4.2x10¯⁵ (No E correction right side tail,12 % overflow
Bremsstrahlung)
δPv/Pv*Pv ~ 5.6x10¯⁵ (E correction: two sides tail, 2.0 % underflow and 3.0 % overflow )
Replace parametrization by a fit.
J-J.Blaising, 18 April 2011
LCD WG6 meeting

10. Discriminating Variables
E(L1)1+E(L1) Visible energy, without neutral energy
Pt(L1) + Pt(L2) Pt Vector Sum
Pt(L1) + Pt(L2) Pt Algebric Sum
M(L1,L2) Invariant mass of the lepton pair
Beta(L1,L2) β of the lepton pair
Theta(L1,L2) Polar angle of Missing momentum vector
Acollinearity of the lepton pair
Acoplanarity of the lepton pair
Δ = | E(L1) –E(L2) | / E(L1) + E(L2) ; energy imbalance
A few plots for ẽ
LCD WG6 meeting
J-J.Blaising, 18 April 2011

11. ẽ: Signal/Background No Overlay
Visible Energy
Invariant Mass
Acoplanarity
Pt VectorSum
Good agreement between generated/reconstructed variables.
LCD WG6 meeting
J-J.Blaising, 18 April 2011

12. μ̃: dN/dP, dn/dθ with Overlay
Ε 99.7 ↘ 99.2% ; Tracks exist, PFO not built, mainly in F/B regions
LCD WG6 meeting
J-J.Blaising, 18 April 2011

13. ẽ: dN/dP, dn/dθ with Overlay
Ε 98.6 ↘ 98.0% ; P dependence (Bremsstrahlung);
LCD WG6 meeting
J-J.Blaising, 18 April 2011

14. μ̃ dn/dPv, dn/dθv with Overlay
FSR E correction, no P dependence
LCD WG6 meeting
J-J.Blaising, 18 April 2011

15. ẽ dn/dPv, dn/dθv with Overlay
FSR ,brems E correction; inefficiency over full range, to investigate
at high P; already present without γγ
LCD WG6 meeting
J-J.Blaising, 18 April 2011

16. μ̃ dN/(δP/P*P) and dN/(δPv/Pv*Pv) Without (top)/with Overlay(bottom)
Left : δP/P*P : 2.0 ↗ 2.2x10¯⁵; ~ no tail, un/overflow: ¯³ ↗ ¯³
Right: δPv/Pv*Pv: 2.5 ↗ 2.7x10¯⁵; small tail, un/overflow: 5 10¯³ ↗ ¯³
J-J.Blaising, 18 April 2011
LCD WG6 meeting

17. ẽ dN/(δP/P*P) and dN/(δPv/Pv*Pv) Without (top)/with Overlay(bottom)
Left : δP/P*P : 4.2 ↗ 4.3x10¯⁵; right side tail, overflow: 12 %
Right: δPv/Pv*Pv: 5.6 ↗ 5.7x10¯⁵; two sides tail, overflow: 2.3 ↗ 4.8 %
J-J.Blaising, 18 April 2011
LCD WG6 meeting

18. Summary With γγ -> h background overlay: For μ̃ : ε 99.7 ↘ 99.2%
inefficiency small, mainly located in F/B regions
Tracks are present; PFO’s are not built (Track quality ?).
For μ̃ without and with overlay the momentum resolution
obtained after full reconstruction is similar: δPv/Pv² ~ 2x10¯⁵ .
The shape of the discriminating variables is not significantly
affected.
For ẽ : ε 98.6 ↘ ~ 98.0%
after E correction δPv/Pv² to ~ 6x10¯⁵, residual tails 2% ↗~ 5% ,
Additional work needed to see whether the high P inefficiency,
present can be reduced.
Disk space needed for fast access to DSTs
Overlay SM Background ? Check CPU Time for jobs of 500 events.
LCD WG6 meeting
J-J.Blaising, 18 April 2011

19. Backup Slides
J-J.Blaising, 18 April 2011
LCD WG6 meeting

20. Generators Cuts Stdhep files produced with Whizard
Selection cuts were used to produce background events:
Same cuts applied on signal after reconstruction.
Whizard cuts:
10° < Θ(L) < 170°
Pt(L) > 4 GeV
Post whizard cuts:
Evis < 2.5 TeV
4° < ΔΦ(L,L) < 176°
Pt(L,L) > 10 GeV
M(L,L) > 100 GeV
J-J.Blaising, 18 April 2011
LCD WG6 meeting