Pre-selection
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Pre-selection • at least one primary reconstructed vertex (with at least 3 tracks) compatible with the beam spot in the bunch crossing • |z vertex | < 150 mm Electrons • trigger: L1_EM14 • author: 1 (reconstructed as hard electron) or 3 (reconstructed as both hard and soft electron) • RobustTight cuts • P T cut: E T,cluster > 20GeV • η cut: 0 < |η cluster | < 1.37, 1.52 < |η cluster | < 2.47 Missing E T • E T > 25GeV Jets • P T >20GeV, where P T = EM scale P T * EMJES correction factor • |η|<2.8 • is good • does not count that jet that has ΔR<0.2 with the tight electron W • W T,mass = sqrt{2*E el,cluster *[cosh(η el,track )]*E T,miss *[1-cos(Φ miss – Φ el,track )]} • W T,mass > 40GeV • having at least one jet that passes all the above cuts • missing E cleaning: reject event if at least one jet with P (EMScale) > Finding the M T of W by using W+jets samples 1
description
1. Finding the M T of W by using W+jets samples. Pre-selection at least one primary reconstructed vertex (with at least 3 tracks) compatible with the beam spot in the bunch crossing |z vertex | < 150 mm Electrons trigger: L1_EM14 - PowerPoint PPT Presentation
Transcript of Pre-selection
Pre-selection• at least one primary reconstructed vertex (with at least 3 tracks) compatible with the beam spot in
the bunch crossing• |zvertex| < 150 mm
Electrons• trigger: L1_EM14• author: 1 (reconstructed as hard electron) or 3 (reconstructed as both hard and soft electron)• RobustTight cuts• PT cut: ET,cluster > 20GeV• η cut: 0 < |ηcluster| < 1.37, 1.52 < |ηcluster| < 2.47
Missing ET
• ET > 25GeV
Jets• PT >20GeV, where PT = EM scale PT * EMJES correction factor • |η|<2.8• is good• does not count that jet that has ΔR<0.2 with the tight electron
W• WT,mass = sqrt{2*Eel,cluster*[cosh(ηel,track)]*ET,miss*[1-cos(Φmiss – Φel,track)]}• WT,mass > 40GeV• having at least one jet that passes all the above cuts• missing ET cleaning: reject event if at least one jet with PT(EMScale) > 10GeV satisfies: (n90 ≤ 5 AND
fHEC > 0.8) OR |jetTime| > 50 OR (|JetQuality| > 0.8 AND emf > 0.95)• discard event if there are at least two electrons that pass through RobustMedium cuts, PT and η cuts
Finding the MT of W by using W+jets samples1
Finding the MT of W by using W+jets samples
Np0 Np1 Np2
Np3 Np4 Np5
the graphs below do not have their y-axes scaled properly
x-axis: number of jets that satisfy the cut requirementy-axis: number of events that passes the pre-selection, has missing ET>25GeV and at least one electron satisfy the selection requirement
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Finding the MT of W by using W+jets samples3
ΔR distribution between the electron from W and its closest jet
Ejet/Eelec distribution, where Eelec is the energy of the electron from W and Ejet is the energy of its closest jet
ΔR Ejet/Eelec
Finding the MT of W by using W+jets samples
Np0 Np1 Np2
Np3 Np4 Np5
the graphs below do not have their y-axes scaled properly
y-axis: number of events that passes all the selections
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Finding the MT of W by using W+jets samples
my result(only Weν)
Imai’s result
stack the graphs in the previous slide with proper scale (cross-sections) to get…
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