Key plots from physics upgrade studies to support the GEM upgrade

A possible upgrade of the CMS muon forward system involves gas electron multiplier chambers (GEM) suggested for installation at LS2 covering the pseudorapidity range of 1.6<eta<2.4. Several benchmark analyses have been studied for the impact of such detector upgrade on the physics performance. Those benchmark channels include the golden decay channel of a SM higgs boson H->ZZ->4mu, the decay of a SM Higgs to 2 muons H->2mu in the VBF channel and the H(mumu)Z(ee) channel. Also the associated production of a Higgs boson with a SM W-boson, WH, was studied in different decay channels with muons in the final state. For physice beyond the SM a new state predicted by compositeness models has been studied, the production of an excited muon mu* together with a SM mu and their subsequent decays to 4 muons of high transverse momentum.

Physics plots for approval

Figure Abbreviated Caption

H2Tau_triggerPt.jpg H to 2 taus with one tau decaying to muon and neutrinos. Such muons have an average pT around 15 GeV. In the case of only one tau decaying leptonically lowering the single muon trigger threshold increases the number of triggered events per fb. JPG

H2Tau_eta.jpg H to 2 taus with one tau decaying to muon and neutrinos. Such muons have an average pT around 15 GeV. Opening the acceptance to larger values is fairly independent on the muon pT. For example increasing the upper eta value from 2.1 to 2.4 increases the number of events by ~6%. JPG

H2Tau_GainWithGEM.jpg H to 2 taus with one tau decaying to muon and neutrinos. Gain by introducing a GEM station which allows to lower trigger threshold. JPG

expected_limits_14TeV.png Expected limit in Higgs to 2 muon analysis. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and PU = 50. The plots below are indeed without PU but the performance is very similar. PNG

sensitivity_14TeV.png Sensitivity (expected significance as a function of luminosity) of the Higgs to 2 muon analysis. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and PU = 50. The plots below are indeed without PU but performance is very similar. PNG

H2Mu_EffvsEta.gif Higgs to 2 muon analysis in the VBF channel. The efficiency times acceptance (e x A) is a function of the trigger acceptance eta. Instrumenting further in the forward region increases the signal efficiency by 10% when going from eta=2.1 to eta=2.4 and reaches nearly 100% when going to eta=4. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and no PU. GIF

H2Mu_EffvsTriggerpt.gif Higgs to 2 muon analysis in the VBF channel. The efficiency times acceptance (e x A) is a function of the trigger pT threshold. Lowering the trigger threshold increases the signal efficiency. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and no PU. GIF

H-2mu-efficiency-vs-ineff-CSC.pdf Higgs to 2 muon in the VBF channel. Efficiency with and w/o the addition of GEM disks as a function of local inefficiency or missing CSCs. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and PU = 50. PNG

H-4mu-eff-vs-local-ineff-CSC.pdf Higgs to 4 muons. Efficiency with and w/o the addition of GEM disks as a function of local inefficiency or missing CSCs. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and PU = 50. PNG

H-4l-efficiency-gain.pdf

Higgs to 4 muons. Efficiency gain with the addition of GEM disks as a function of local inefficiency or missing CSCs. The result is based on a signal simulation at sqrt(s)=14 TeV with the CMSSW_6 detector configuration and PU = 50. PNG

significance_mtt.png

Expected significance (S/sqrt(S+B)) as a function of luminosity for the WH channel where W decay to muon and Higgs in a tau-jet pair. The curve is obtained as an estrapolation at sqrt(s)=14 TeV of the 2012 result at sqrt(s)=8 TeV and the integrated luminisity 19.5 fb^(-1). The result is based on Monte Carlo simulations at sqrt(s)=8 TeV for the signal and the unreducible backgrounds and on the data-driven estimation for the reducible backgrounds.

PNG

fraction_3p5_2p4_mtt_14TeV.png

WH analysis where W decay to muon and Higgs in tau-jet pair. The plot shows the muon fractions in the eta regions of interest 1.6-2.4 (empty circle) and 1.6-3.5 (full circle) as a function of the pT threshold for MC simulation of signal at sqrt(s)=14 TeV PU 50bx25. The muon is selected at generator level. These fractions are evaluated counting the number of events with a muon in the eta region of interest respect to the total number of events. The plot on the bottom show the relative improvement obtained increasing the CMS acceptance. PNG

fraction_mtt_8vs14.pdf

WH analysis where W decay to muon and Higgs in tau-jet pair. The plot shows the muon fractions in the eta regions of interest 1.6-2.4 as a function of the pT threshold for MC simulation of signal at sqrt(s)=8 TeV (full circle) and sqrt(s)=14 TeV PU 50bx25 (empty circle). The muon, selected at generator level, is also matched with the reconstructed ones (Reco, Global, PF, Reco+Isolation). These fractions are evaluated counting the number of events with a muon in the eta region of interest respect to the total number of events in the CMS muon acceptance (eta 2.5). The fractions at sqrt(s)=8 TeV are lower than that at sqrt(s)=14 TeV and this effect is remarkable at higher pt. Effect can be relevant for a SingleMu trigger selection.

PNG

significance_mmt.png

Expected significance (S/sqrt(S+B)) as a function of luminosity for the WH channel where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The curve is obtained as an estrapolation at sqrt(s)=14 TeV of the 2012 result at sqrt(s)=8 TeV and the integrated luminisity 19.5 fb^(-1). The result is based on Monte Carlo simulations at sqrt(s)=8 TeV for the signal and the unreducible backgrounds and on the data-driven estimation for the reducible backgrounds.

PNG

fraction_mmt_3p5_2p4_1muonL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plot shows the leading (L) muon fractions for events with only one muon in the eta regions of interest 1.6-2.4 (empty circle) and 1.6-3.5 (full circle) as a function of the pT threshold for MC simulation of signal at sqrt(s)=14 TeV PU 50bx25. The two muons are selected at generator level. These fractions are evaluated counting the number of events with the leading muon in the eta region of interest and the subleading muon with eta<1.6 respect to the total number of events. The plot on the bottom show the relative improvement obtained increasing the CMS acceptance. PNG

fraction_mmt_3p5_2p4_1muonSL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plot shows the subleading (SL) muon fractions for events with only one muon in the eta regions of interest 1.6-2.4 (empty circle) and 1.6-3.5 (full circle) as a function of the pT threshold for MC simulation of signal at sqrt(s)=14 TeV PU 50bx25. The two muons are selected at generator level. These fractions are evaluated counting the number of events with the subleading muon in the eta region of interest and the leading muon with eta<1.6 respect to the total number of events. The plot on the bottom show the relative improvement obtained increasing the CMS acceptance. PNG

fraction_mmt_3p5_2p4_2muonL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plot shows the leading (L) muon fractions for events with both muons in the eta regions of interest 1.6-2.4 (empty circle) and 1.6-3.5 (full circle) as a function of the pT threshold for MC simulation of signal at sqrt(s)=14 TeV PU 50bx25. The two muons are selected at generator level. These fractions are evaluated counting the number of events with the leading and subleading muons in the eta region of interest respect to the total number of events. The plot on the bottom show the relative improvement obtained increasing the CMS acceptance. PNG

fraction_mmt_3p5_2p4_2muonSL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plot shows the subleading (SL) muon fractions for events with both muons in the eta regions of interest 1.6-2.4 (empty circle) and 1.6-3.5 (full circle) as a function of the pT threshold for MC simulation of signal at sqrt(s)=14 TeV PU 50bx25. The two muons are selected at generator level. These fractions are evaluated counting the number of events with the leading and subleading muons in the eta region of interest respect to the total number of events. The plot on the bottom show the relative improvement obtained increasing the CMS acceptance. PNG

fraction_mmt_8vs14_1muonL.png

fraction_mmt_8vs14_1muonSL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plots show the muon fractions in the eta regions of interest 1.6-2.4 as a function of the pT threshold for MC simulation of signal at sqrt(s)=8 TeV (full circle) and sqrt(s)=14 TeV PU 50bx25 (empty circle). The two muons, selected at generator level, are also matched with the reconstructed ones (Reco, Global, PF, Reco+Isolation) assuming that the leading (L) muon comes fron the W and the subleading (SL) muon from the tau. These fractions are evaluated counting the number of events with only one muon (the L on the plot on top or the SL on the plot on bottom) in the eta region of interest respect to the total number of event in the CMS muon acceptance (eta 2.5). The fractions for the L muon at sqrt(s)=8 TeV are lower than that at sqrt(s)=14 TeV while for the SL muon are comparable. Effect can be relevant for a SingleMu trigger selection.

Lmuon_PNG , SLmuon_PNG

fraction_mmt_8vs14_2muonsL.png

fraction_mmt_8vs14_2muonsSL.png

WH analysis where W decay to muon and Higgs in a tau pair: one of the two taus then decays in muon and the other hadronically. The plots show the muon fractions in the eta regions of interest 1.6-2.4 as a function of the pT threshold for MC simulation of signal at sqrt(s)=8 TeV (full circle) and sqrt(s)=14 TeV and PU 50bx25 (empty circle). The two muons, selected at generator level, are also matched with the reconstructed ones (Reco, Global, PF, Reco+Isolation) assuming that the leading (L) muon comes fron the W and the subleading (SL) muon from the tau. These fractions (for the L muon on the plot on top and for the SL muon on the plot on bottom) are evaluated counting the number of events with both L and SL muons in the eta region of interest respect to the total number of event in the CMS muon acceptance (eta 2.5). The fractions at sqrt(s)=8 TeV are lower than that at sqrt(s)=14 TeV . Effect can be relevant for SingleMu or DoubleMu trigger selection.

Lmuon_PNG , SmuonL_PNG

Additional material

Muon-postLS1-geometry.jpg Post-LS1 geometry. JPG

Event displays

Here we should collect a few nice event displays with hits in the GEM stations.

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Full-Muon-Detail-May-2013.pdf r1 manage 237.6 K 2013-05-24 - 14:56 KerstinHoepfner Post-LS1 muon geometry
PDFpdf H-2mu-efficiency-vs-ineff-CSC.pdf r1 manage 69.2 K 2013-04-09 - 11:45 PaoloGiacomelli H2Mu in VBF channel, Efficiency as a function of local inefficiency of CSCs with and w/o the addition of GEM disks
PNGpng H-2mu-efficiency-vs-ineff-CSC.png r1 manage 285.2 K 2013-04-09 - 11:45 PaoloGiacomelli H2Mu in VBF channel, Efficiency as a function of local inefficiency of CSCs with and w/o the addition of GEM disks
PDFpdf H-4l-efficiency-gain.pdf r1 manage 59.8 K 2013-04-09 - 12:13 PaoloGiacomelli Higgs to 4 muons. Efficiency gain with the addition of GEM disks.
PNGpng H-4l-efficiency-gain.png r1 manage 251.9 K 2013-04-09 - 12:13 PaoloGiacomelli Higgs to 4 muons. Efficiency gain with the addition of GEM disks.
PDFpdf H-4mu-eff-vs-local-ineff-CSC.pdf r1 manage 71.9 K 2013-04-09 - 12:01 PaoloGiacomelli Higgs to 4 muons. Efficiency as a function of local inefficiency of CSCs with and w/o the addition of GEM disks
PNGpng H-4mu-eff-vs-local-ineff-CSC.png r1 manage 308.2 K 2013-04-09 - 12:01 PaoloGiacomelli Higgs to 4 muons. Efficiency as a function of local inefficiency of CSCs with and w/o the addition of GEM disks
GIFgif H2Mu_EffvsEta.gif r1 manage 66.1 K 2013-03-21 - 19:22 KerstinHoepfner H2Mu in VBF channel, Efficiency as a fct of eta, no PU, plot by Adrian
PDFpdf H2Mu_EffvsEta.pdf r1 manage 15.9 K 2013-03-21 - 19:23 KerstinHoepfner H2Mu in VBF channel, Efficiency as a fct of eta, no PU, plot by Adrian
GIFgif H2Mu_EffvsTriggerpt.gif r1 manage 62.2 K 2013-03-21 - 19:23 KerstinHoepfner H2Mu in VBF channel, Efficiency as a fct of trigger pT, no PU, plot by Adrian
PDFpdf H2Mu_EffvsTriggerpt.pdf r1 manage 15.0 K 2013-03-21 - 19:23 KerstinHoepfner H2Mu in VBF channel, Efficiency as a fct of trigger pT, no PU, plot by Adrian
JPEGjpg H2Tau_GainWithGEM.jpg r1 manage 95.1 K 2013-05-15 - 19:34 KerstinHoepfner H2Tau Gain with GEMs
PDFpdf H2Tau_GainWithGEM.pdf r1 manage 52.7 K 2013-05-15 - 19:34 KerstinHoepfner H2Tau Gain with GEMs
JPEGjpg H2Tau_eta.jpg r1 manage 76.3 K 2013-05-15 - 19:32 KerstinHoepfner  
PDFpdf H2Tau_eta.pdf r1 manage 44.5 K 2013-05-15 - 19:32 KerstinHoepfner  
JPEGjpg H2Tau_triggerPt.jpg r1 manage 86.9 K 2013-05-15 - 19:44 KerstinHoepfner H2Tau Number of evts as fct of trigger threshold
PDFpdf H2Tau_triggerPt.pdf r1 manage 52.0 K 2013-05-15 - 19:33 KerstinHoepfner H2Tau Number of evts as fct of trigger threshold
PDFpdf Muon-postLS1-geometry.pdf r1 manage 237.6 K 2013-05-24 - 15:02 KerstinHoepfner Post-LS1 muon geometry
PNGpng expected_limits_14TeV.png r1 manage 145.6 K 2013-04-03 - 18:18 KerstinHoepfner H2Mu expected sensitivity at 14 TeV
PDFpdf fraction_3p5_2p4_mtt_14.pdf r1 manage 21.5 K 2013-04-29 - 15:18 RaffaellaRadogna WH in mtt, Muon fractions in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PNGpng fraction_3p5_2p4_mtt_14TeV.png r1 manage 23.5 K 2013-04-29 - 15:18 RaffaellaRadogna WH in mtt, Muon fractions in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PDFpdf fraction_mmt_3p5_2p4_1muonL.pdf r1 manage 19.5 K 2013-04-29 - 15:41 RaffaellaRadogna WH in mmt, Leading Muon fractions for events with only one muon in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PNGpng fraction_mmt_3p5_2p4_1muonL.png r1 manage 25.7 K 2013-04-29 - 15:41 RaffaellaRadogna WH in mmt, Leading Muon fractions for events with only one muon in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PDFpdf fraction_mmt_3p5_2p4_1muonSL.pdf r1 manage 19.5 K 2013-04-29 - 15:42 RaffaellaRadogna WH in mmt, SubLeading Muon fractions for events with only one muon in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PNGpng fraction_mmt_3p5_2p4_1muonSL.png r1 manage 25.8 K 2013-04-29 - 15:42 RaffaellaRadogna WH in mmt, SubLeading Muon fractions for events with only one muon in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PDFpdf fraction_mmt_3p5_2p4_2muonL.pdf r1 manage 20.0 K 2013-04-29 - 15:44 RaffaellaRadogna WH in mmt, Leading Muon fractions for events with both muons in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PNGpng fraction_mmt_3p5_2p4_2muonL.png r1 manage 24.3 K 2013-04-29 - 15:44 RaffaellaRadogna WH in mmt, Leading Muon fractions for events with both muons in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PDFpdf fraction_mmt_3p5_2p4_2muonSL.pdf r1 manage 19.2 K 2013-04-29 - 15:45 RaffaellaRadogna WH in mmt, SubLeading Muon fractions for events with both muons in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PNGpng fraction_mmt_3p5_2p4_2muonSL.png r1 manage 25.1 K 2013-04-29 - 15:45 RaffaellaRadogna WH in mmt, SubLeading Muon fractions for events with both muons in 1.6<|eta|<2.4 and 1.6<|eta|<3.5 as a function of the pT threshold at 14 TeV PU50bx25.
PDFpdf fraction_mmt_8vs14_1muonL.pdf r1 manage 25.9 K 2013-04-30 - 18:56 RaffaellaRadogna WH in mmt, Leading Muons fractions, as a function of the pT threshold, for events with only one muon in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PNGpng fraction_mmt_8vs14_1muonL.png r1 manage 25.9 K 2013-04-30 - 18:56 RaffaellaRadogna WH in mmt, Leading Muons fractions, as a function of the pT threshold, for events with only one muon in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PDFpdf fraction_mmt_8vs14_1muonSL.pdf r1 manage 27.2 K 2013-04-30 - 18:55 RaffaellaRadogna WH in mmt, SubLeading Muons fractions, as a function of the pT threshold, for events with only one muon in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PNGpng fraction_mmt_8vs14_1muonSL.png r1 manage 27.0 K 2013-04-30 - 18:55 RaffaellaRadogna WH in mmt, SubLeading Muons fractions, as a function of the pT threshold, for events with only one muon in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PDFpdf fraction_mmt_8vs14_2muonsL.pdf r1 manage 26.4 K 2013-04-30 - 18:37 RaffaellaRadogna WH in mmt, Leading Muons fractions, as a function of the pT threshold, for events with both muons in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PNGpng fraction_mmt_8vs14_2muonsL.png r1 manage 25.5 K 2013-04-30 - 18:37 RaffaellaRadogna WH in mmt, Leading Muons fractions, as a function of the pT threshold, for events with both muons in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PDFpdf fraction_mmt_8vs14_2muonsSL.pdf r1 manage 28.0 K 2013-04-30 - 18:53 RaffaellaRadogna WH in mmt, SubLeading Muons fractions, as a function of the pT threshold, for events with both muons in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PNGpng fraction_mmt_8vs14_2muonsSL.png r1 manage 28.4 K 2013-04-30 - 18:36 RaffaellaRadogna WH in mmt, SubLeading Muons fractions, as a function of the pT threshold, for events with both muons in 1.6<|eta|<2.4 at 8 TeV and 14 TeV PU50bx25.
PDFpdf fraction_mtt_8vs14.pdf r1 manage 34.9 K 2013-04-18 - 11:35 RaffaellaRadogna WH in mtt, Muon fractions in 1.6<|eta|<2.4 as a function of the pT threshold at 8 TeV and 14 TeV PU50bx25.
PNGpng fraction_mtt_8vs14.png r1 manage 25.3 K 2013-04-18 - 11:36 RaffaellaRadogna WH in mtt, Muon fractions in 1.6<|eta|<2.4 as a function of the pT threshold at 8 TeV and 14 TeV PU50bx25.
PNGpng sensitivity_14TeV.png r1 manage 193.6 K 2013-04-03 - 18:26 KerstinHoepfner  
PDFpdf significance_mmt.pdf r1 manage 14.2 K 2013-04-29 - 14:56 RaffaellaRadogna  
PNGpng significance_mmt.png r1 manage 11.8 K 2013-04-29 - 14:56 RaffaellaRadogna  
PDFpdf significance_mtt.pdf r1 manage 13.9 K 2013-04-29 - 14:57 RaffaellaRadogna  
PNGpng significance_mtt.png r1 manage 11.4 K 2013-04-29 - 14:54 RaffaellaRadogna  
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Topic revision: r16 - 2015-05-27 - KerstinHoepfner
 
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