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Plots for "Triggering on low pT muons and di-muons for B-physics" CSC book chapter

Introduction

This page contains all plots in the CSC note "Triggering on low pT muons and di-muons for B-physics" which forms a chapter of the CSC book "Expected Performance of the ATLAS Experiment Detector, Trigger, Physics", CERN-OPEN-2008-020, arXiv:0901.0512.

Plots

efficiency_truth_csc.gif

Figure 2: Probability of including the second muon from J/ψ decays RoI as a function of the extended RoI size for different samples. Open squares are from J/ψ decays where one muon has pT>6 GeV and the other pT>3 GeV. Full squares are from J/ψ decays where one muon has pT>4 GeV and the other pT>2.5 GeV.



eta_deltaeta.gif

Figure 3: The η direction of muons at the intercation point vs. the difference in η position between the inner detector and the middle station of the muon spectrometer, for muons with pT=6 GeV. The lines indicate the choice of η regions for the parameterization.



chi2_jpsi_csc.gif

Figure 4: Distribution of the vertex χ2 for true J/ψ decays (shaded) and for fake di-muon triggers (open histogram).



eff_pt_high_csc.gif eff_pt_low_csc.gif

Figure 5: Efficiency of TrigDiMuon relative to muons identified by Atlas.MuGirl for the higher pT muon (left) and the second muon (right).



pik_efficiency_mu4.gif pik_efficiency_mu6.gif

Figure 6: Efficiency for muons from K and π decays as a function of pT for the baseline muComb selection, compared to the optimized muComb selection described in Section 5.1 for the 4 GeV threshold (left) and the 6 GeV threshold (right).



TightWinAliEff.gif

Figure 7: Efficiency of the tight window match on single muons simulated with the aligned detector setup. The efficiency drop for the 6 GeV threshold is shown according to different σ cuts.



TightWinMisEff_MU06.gif

Figure 8: Efficiency of the tight window match at 2.7 σ on single muons simulated with the misaligned detector setup. The relative efficiency is shown for the 6 GeV threshold.



fig9_left.gif fig9_right-2.gif

Figure 9: The distribution of ΔR between the level-1 RoI and the offline muon track, (a) using the offline track parameters at the perigee and (b) by extrapolating the offline track to the RoI position. The dashed line shows the value where the cut was applied for the matching.



fig_deltaR_lvl2.gif

Figure 10: The distribution of ΔR between the level-2 muon and the offline muon track. The dashed line shows the value where the cut was applied for the matching.



fig11.gif

Figure 11: The overall efficiency of the level-1 single muon trigger with respect to the offline selection obtained by the tag-and-probe method (filled circles) and the efficiency estimated from a single muon Monte Carlo sample (open circles). The curve is a fit to the efficiency obtained by the tag-and-probe method from Equation 4.



fig12_capA.gif fig12_a.gif fig12_b.gif

Figure 12: Fit parameters (A, α and b in Equation 4) of the efficiency curve in different η and φ regions.



fig13_pt.gif fig13_eta.gif fig13_cos.gif

Figure 13: Distributions of J/ψ variables, pT, η and cosθ*. The open histograms are for all reconstructed J/ψ´s with the generator level cut of pTμ1>6 GeV and pTμ2>4 GeV. Filled histograms are distributions of events passing the level-1 di-muon trigger.



fig14_pt.gif fig14_eta.gif fig14_cos.gif

Figure 14: Di-muon trigger efficiency with pTμ>6 GeV. Open circles are the result obtained from decision of the level-1 di-muon trigger and filled circles are the efficiency obtained using the parameterization shown in Figure 12.



fig_eff_L2_pt.gif fig_eff_L2L1_pt.gif

Figure 15: The overall efficiency of the level-2 single muon trigger, (a) with respect to offline reconstruction, (b) with respect to level-1.



fig_eff_map_pt.gif fig_eff_map_eta.gif fig_eff_map_phi.gif

Figure 16: The overall L2/rec single-muon trigger efficiency as a function of pT, η and φ. Efficiency is calculated using the trigger efficiency map (black circles) and it is compared to the one calculated using matched level-1 and level-2 trigger objects (open triangles).



fig_eff_jpsi_pt.gif fig_eff_jpsi_eta.gif fig_eff_jpsi_phi.gif fig_eff_jpsi_theta.gif

Figure 17: The overall di-muon J/ψ trigger efficiency as a function of pT, η, φ and cosθ*. Efficiencies from the trigger decision bit (open triangles) and the ones calculated from the trigger efficiency map (black circles) are shown.



fig_eff_jpsi_dR.gif

Figure 18: The overall di-muon J/ψ trigger efficiency as a function of ΔR. Efficiencies from the trigger decision bit (open triangles) and the ones calculated from the trigger efficiency map (black circles) are shown.



Tables

table1.jpg

Table 1: Summary of MC samples.



table2.jpg

Table 2: Efficiency, relative to level-1, of the two di-muon trigger algorithms for a trigger threshold of 4 GeV. In parenthesis is the efficiency calculated relative to J/ψ events that passed the single muon trigger that selects the input to TrigDiMuon. To estimate the efficiency we used a sample of Λb -> J/ψ Λ, where J/ψ-> μ(pT>2.5 GeV) μ(pT>4 GeV).



table3.jpg

Table 3: Efficiency, relative to level-1, of the two di-muon trigger algorithms for a trigger threshold of 6 GeV. In parenthesis is the efficiency calculated relative to J/ψ events that passed the single muon trigger that selects the input to TrigDiMuon. To estimate the efficiency we used a sample of Λb -> J/ψ Λ, where J/ψ-> μ(pT>2.5 GeV) μ(pT>4 GeV).



table4.jpg

Table 4: Fake rate of the TrigDiMuon algorithm for muons from different sources and total fake rate using a trigger threshold of 4 GeV, at a luminosity of 1031cm-2s-1. The b and c components were estimated from a sample of bbbar -> μ+X$ with pTμ 4 GeV and the K/π component from the minimum bias sample with forced decays.



table5.jpg

Table 5: Fake rate of the TrigDiMuon algorithm for muons from different sources and total fake rate using a trigger threshold of 6 GeV, at a luminosity of 1033cm-2s-1. The b and c components were estimated from a sample of bbbar -> μ+X with pTμ 4 GeV and the K/π component from the minimum bias sample with forced decays.



table6.jpg

Table 6: Total rate and efficiency relative to level-1 of the TrigDiMuon algorithm including the vertex cut χ2<30, and of the topological di-muon trigger. The efficiency is estimated from a sample of Λb -> J/ψ Λ, where J/ψ-> μ(pT>2.5 GeV) μ(pT>4 GeV).



table7.jpg

Table 7: Efficiency of the TrigDiMuon and Topological di-muon algorithms for J/ψ reconstructed by Atlas.MuGirl. To estimate the efficiency we used a sample of Λb -> J/ψ Λ, where J/ψ-> μ(pT>2.5 GeV) μ(pT>4 GeV).



table8.jpg

Table 8: Expected rate with a 6 GeV single muon threshold from the muComb algorithm for the π and K decays. The rejection with respect to the baseline muComb algorithm is shown in parenthesis. These rates were estimated from the forced-decay minimum bias sample.



table9.jpg

Table 9: Expected rate with a 6 GeV single muon threshold from the muComb algorithm for the b component. In parenthesis is the percentage rejection with respect to the baseline muComb.



table10.jpg

Table 10: Expected output rate of muFast and muComb for a 4 GeV threshold at the 1031cm-2s-1 luminosity.



table11.jpg

Table 11: Expected output rate of muFast and muComb for a 6 GeV threshold at the 1033cm-2s-1 luminosity.



table12.jpg

Table 12: The rates after level-1 and level-2 using the proposed calibration trigger for a luminosity of 1031cm-2s-1 with the threshold of pT>6 GeV. The contribution of J/ψ-> μ+μ- process to the rate is also shown in parentheses.


Major updates:
-- IoannisNomidis - 13 Feb 2009

Responsible: IoannisNomidis
Last reviewed by: Never reviewed

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