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 Wboson, 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.
Figure  Abbreviated Caption 

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 
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 
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 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 (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 
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 
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 
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 
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 
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 
Expected significance (S/sqrt(S+B)) as a function of luminosity for the WH channel where W decay to muon and Higgs in a taujet 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 datadriven estimation for the reducible backgrounds. PNG 

WH analysis where W decay to muon and Higgs in taujet pair. The plot shows the muon fractions in the eta regions of interest 1.62.4 (empty circle) and 1.63.5 (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 
WH analysis where W decay to muon and Higgs in taujet pair. The plot shows the muon fractions in the eta regions of interest 1.62.4 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 
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 datadriven estimation for the reducible backgrounds. 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 1.62.4 (empty circle) and 1.63.5 (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 


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 1.62.4 (empty circle) and 1.63.5 (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 

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 1.62.4 (empty circle) and 1.63.5 (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 


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 1.62.4 (empty circle) and 1.63.5 (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 
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 1.62.4 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 
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 1.62.4 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. 
PostLS1 geometry. JPG 
Here we should collect a few nice event displays with hits in the GEM stations.
I  Attachment  History  Action  Size  Date  Who  Comment 

FullMuonDetailMay2013.pdf  r1  manage  237.6 K  20130524  14:56  KerstinHoepfner  PostLS1 muon geometry  
H2muefficiencyvsineffCSC.pdf  r1  manage  69.2 K  20130409  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  
png  H2muefficiencyvsineffCSC.png  r1  manage  285.2 K  20130409  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 
H4lefficiencygain.pdf  r1  manage  59.8 K  20130409  12:13  PaoloGiacomelli  Higgs to 4 muons. Efficiency gain with the addition of GEM disks.  
png  H4lefficiencygain.png  r1  manage  251.9 K  20130409  12:13  PaoloGiacomelli  Higgs to 4 muons. Efficiency gain with the addition of GEM disks. 
H4mueffvslocalineffCSC.pdf  r1  manage  71.9 K  20130409  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  
png  H4mueffvslocalineffCSC.png  r1  manage  308.2 K  20130409  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 
gif  H2Mu_EffvsEta.gif  r1  manage  66.1 K  20130321  19:22  KerstinHoepfner  H2Mu in VBF channel, Efficiency as a fct of eta, no PU, plot by Adrian 
H2Mu_EffvsEta.pdf  r1  manage  15.9 K  20130321  19:23  KerstinHoepfner  H2Mu in VBF channel, Efficiency as a fct of eta, no PU, plot by Adrian  
gif  H2Mu_EffvsTriggerpt.gif  r1  manage  62.2 K  20130321  19:23  KerstinHoepfner  H2Mu in VBF channel, Efficiency as a fct of trigger pT, no PU, plot by Adrian 
H2Mu_EffvsTriggerpt.pdf  r1  manage  15.0 K  20130321  19:23  KerstinHoepfner  H2Mu in VBF channel, Efficiency as a fct of trigger pT, no PU, plot by Adrian  
jpg  H2Tau_GainWithGEM.jpg  r1  manage  95.1 K  20130515  19:34  KerstinHoepfner  H2Tau Gain with GEMs 
H2Tau_GainWithGEM.pdf  r1  manage  52.7 K  20130515  19:34  KerstinHoepfner  H2Tau Gain with GEMs  
jpg  H2Tau_eta.jpg  r1  manage  76.3 K  20130515  19:32  KerstinHoepfner  
H2Tau_eta.pdf  r1  manage  44.5 K  20130515  19:32  KerstinHoepfner  
jpg  H2Tau_triggerPt.jpg  r1  manage  86.9 K  20130515  19:44  KerstinHoepfner  H2Tau Number of evts as fct of trigger threshold 
H2Tau_triggerPt.pdf  r1  manage  52.0 K  20130515  19:33  KerstinHoepfner  H2Tau Number of evts as fct of trigger threshold  
MuonpostLS1geometry.pdf  r1  manage  237.6 K  20130524  15:02  KerstinHoepfner  PostLS1 muon geometry  
png  expected_limits_14TeV.png  r1  manage  145.6 K  20130403  18:18  KerstinHoepfner  H2Mu expected sensitivity at 14 TeV 
fraction_3p5_2p4_mtt_14.pdf  r1  manage  21.5 K  20130429  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.  
png  fraction_3p5_2p4_mtt_14TeV.png  r1  manage  23.5 K  20130429  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. 
fraction_mmt_3p5_2p4_1muonL.pdf  r1  manage  19.5 K  20130429  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.  
png  fraction_mmt_3p5_2p4_1muonL.png  r1  manage  25.7 K  20130429  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. 
fraction_mmt_3p5_2p4_1muonSL.pdf  r1  manage  19.5 K  20130429  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.  
png  fraction_mmt_3p5_2p4_1muonSL.png  r1  manage  25.8 K  20130429  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. 
fraction_mmt_3p5_2p4_2muonL.pdf  r1  manage  20.0 K  20130429  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.  
png  fraction_mmt_3p5_2p4_2muonL.png  r1  manage  24.3 K  20130429  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. 
fraction_mmt_3p5_2p4_2muonSL.pdf  r1  manage  19.2 K  20130429  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.  
png  fraction_mmt_3p5_2p4_2muonSL.png  r1  manage  25.1 K  20130429  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. 
fraction_mmt_8vs14_1muonL.pdf  r1  manage  25.9 K  20130430  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.  
png  fraction_mmt_8vs14_1muonL.png  r1  manage  25.9 K  20130430  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. 
fraction_mmt_8vs14_1muonSL.pdf  r1  manage  27.2 K  20130430  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.  
png  fraction_mmt_8vs14_1muonSL.png  r1  manage  27.0 K  20130430  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. 
fraction_mmt_8vs14_2muonsL.pdf  r1  manage  26.4 K  20130430  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.  
png  fraction_mmt_8vs14_2muonsL.png  r1  manage  25.5 K  20130430  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. 
fraction_mmt_8vs14_2muonsSL.pdf  r1  manage  28.0 K  20130430  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.  
png  fraction_mmt_8vs14_2muonsSL.png  r1  manage  28.4 K  20130430  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. 
fraction_mtt_8vs14.pdf  r1  manage  34.9 K  20130418  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.  
png  fraction_mtt_8vs14.png  r1  manage  25.3 K  20130418  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. 
png  sensitivity_14TeV.png  r1  manage  193.6 K  20130403  18:26  KerstinHoepfner  
significance_mmt.pdf  r1  manage  14.2 K  20130429  14:56  RaffaellaRadogna  
png  significance_mmt.png  r1  manage  11.8 K  20130429  14:56  RaffaellaRadogna  
significance_mtt.pdf  r1  manage  13.9 K  20130429  14:57  RaffaellaRadogna  
png  significance_mtt.png  r1  manage  11.4 K  20130429  14:54  RaffaellaRadogna 