CMS Muon Results

RMS width of residuals of the local-x position, given by the position of the muon segment with respect to the extrapolated tracker track, as a function of the muon station, for DT chambers in the barrel region (left) and CSCs in the endcap regions (right). Data (with asymptotic alignment) is compared with MC expectations.

pdf pdf

RMS width of residuals of the local-x position for the track-to-segment match in the first muon station as a function of the muon pseudorapidity, with a requirement on momentum p > 90 GeV /c. Data (with asymptotic alignment) is compared with MC expectations.

pdf

RMS width of residuals of the local-x position for the track-to-segment match in the first muon station as a function of the muon momentum in different angular regions: BARREL |η| < 0.9, and ENDCAP 1.2 < |η| < 2.4. Data (with asymptotic alignment) is compared with MC expectations.

pdf pdf

MC muon generation flat in p, eta, phi. Selected range: 20 GeV < P < 500 GeV. Left: Number of muon hits in Global muon tracks selected with Tight quality cuts except for the quality cuts in the global track. Right: Normalized chi2 of the global muon track (tracker+muon hits) selected with Tight quality cuts except for the quality cuts in the global track.

pdf pdf

Gaussian width of the reconstructed q/p w.r.t. the MC truth, for a dedicated high-pT algorithm (picky muon reconstructor), including tracker and muon hits, for the various misalignment scenarios with and without APE. The ideal scenario is also shown. The performance of the tracker-only fit is shown for comparison.

pdf pdf

Number of muon hits in Global muon tracks selected with Tight quality cuts except for the quality cuts in the global track.

pdf

RMS of the pull between the reconstructed segment in the first muon station and the extrapolated tracker track. The most sensitive coordinate is considered (local-X position, corresponding to the bending coordinate in the transverse plane).

pdf

Impact of the muon Alignment Position Errors (APE) on the 2016 Startup HLT efficiency of the Mu20 trigger path.

pdf pdf

pdf

Medium ID efficiencies vs η. Error bars in the plot include only statistical uncertainty.

pdf

High-pT ID efficiencies vs η. Error bars in the plot include only statistical uncertainty.

pdf

Tight ID efficiencies vs η. Error bars in the plot include only statistical uncertainty.

pdf

Tight Isolation efficiencies vs η, with respect to Tight ID. Error bars in the plot include only statistical uncertainty

pdf

Tight Isolation efficiencies vs pT, with respect to Tight ID. Error bars in the plot include only statistical uncertainty

pdf

Tight Isolation efficiencies vs vtx, with respect to Tight ID. Error bars in the plot include only statistical uncertainty.

pdf

Loose Tracker Isolation efficiencies vs η, with respect to High-pT ID. Error bars in the plot include only statistical uncertainty.

pdf

Loose Tracker Isolation efficiencies vs pT, with respect to High-pT ID. Error bars in the plot include only statistical uncertainty.

pdf

Loose Tracker Isolation efficiencies vs vtx, with respect to High-pT ID. Error bars in the plot include only statistical uncertainty.

pdf

Isolation efficiency vs p_T in the barrel (left), in the endcap (middle), and vs. the number of vertices in the event (right) for Particle-Flow muons with Tight Muon quality requirements. The isolation variable is calculated using the Particle-Flow algorithm; the isolation cone is 0.4 and the isolation cut is 0.15. The isolation algorithm uses only charged hadron tracks associated to the Z → μμ primary vertex (PfNoPileUp); no PU correction is applied to the neutral component. The measurement is done by applying the Tag&Probe method to Z → μμ events.

pdf pdf pdf

HLT efficiency of single muon trigger not requiring isolation (HLT_Mu30/L1_Mu12, left) and the combined Level-1*HLT efficiency (L1_Mu12*HLT_Mu30, right) vs. η for Tight Muon selection with p_T > 35 GeV obtained by applying the Tag&Probe method to Z → μμ events. Overall (|η| < 2.1) Level-1*HLT efficiency: 93.3% in data, 94.2% in MC; scale factor (data/MC)=0.991. Barrel (|η| < 0.9) Level-1*HLT efficiency: 95.0% in data, 96.8% in MC; scale factor=0.982. Endcap (0.9 < |η| < 2.1) Level-1*HLT efficiency: 89.9% in data, 89.0% in MC; scale factor=1.01

pdf pdf

HLT_Mu30/L1Mu_12 (left) and L1_Mu12*HLT_Mu30 (right) efficiency vs. p_T in Barrel (|η| < 0.9) for Tight Muon selection obtained by applying the Tag&Probe method to Z → μμ events. Level-1*HLT efficiency for p_T > 35 GeV: 95.0% in data, 96.8% in MC; scale factor=0.982.

pdf pdf

HLT_Mu30/L1_Mu12 (left) and L1_Mu12*HLT_Mu30 (right) efficiency vs. p_T in Endcap (0.9 < |η| < 2.1) for Tight Muon selection obtained by applying the Tag&Probe method to Z → μμ events. Level-1*HLT efficiency for p_T > 35 GeV: 89.9% in data, 89.0% in MC; scale factor=1.01.

pdf pdf

Efficiency of three benchmark muon selections as a function of muon p_T in 2010 data (L_int = 40 pb^-1) and simulation

The measurement is made by applying the tag-and-probe technique to muons from J/ψ → μμ in the range of p_T < 20 GeV and from Z → μμ in the range of p_T > 20 GeV.

• Soft muon selection, abs(η) < 1.2 (left) and 1.2 < abs(η) < 2.4 (right). Efficiency in data is slightly higher than in simulation due to more conservative uncertainty estimates used.

pdf pdf

• Particle-flow muon selection, abs(η) < 1.2 (left) and 1.2 < abs(η) < 2.4 (right).

pdf pdf

• Tight muon selection, abs(η) < 1.2 (left) and 1.2 < abs(η) < 2.4 (right). In the endcaps, efficiency is slightly lower in data than in simulation because the latter does not take into account a few chambers that were not operational in 2010.

pdf pdf

Invariant mass distribution of Z → μμ candidates for L_int = 35 pb^-1. The number of candidates observed in data is 11697; MC predictions (no data-driven corrections) are 11968 signal events and 52 background events.

pdf pdf

Transverse mass distribution, M_T, of W → μν candidates for L_int = 35 pb^-1. In the region M_T > 50 GeV, the number of candidates observed in data is 144718, whereas the number of expected events is 144995.

pdf pdf

Invariant mass distribution of dimuons in the vicinity of the Y(nS) resonances, for an integrated luminosity of 40 pb^-1 at 7 TeV

• Invariant mass distribution integrated over the full rapidity range:

pdf

• Invariant mass distribution for dimuons with both muons in the region of |η| < 1:

pdf

* J/ψ invariant mass distributions for |y(J/ψ and ψ(2S))| < 0.5:

pdf

Invariant mass distribution of dimuons in the vicinity of the J/ψ resonance, for an integrated luminosity of 40 pb^-1 at 7 TeV

• J/ψ invariant mass distribution integrated over the full rapidity range (|y(J/ψ)| < 2.4):

pdf

• J/ψ invariant mass distributions for |y(J/ψ)| < 1.4 (left) and for 1.4 < |y(J/ψ)| < 2.4 (right):

pdf pdf

• J/ψ invariant mass distributions for |y(J/ψ)| < 0.7 (left) and |Y(J/ψ)| < 0.5 (right):

pdf pdf

2011 data collected by early July, corresponding to an integrated luminosity of 1.1 fb^-1, superposition of various dimuon trigger paths:

pdf

2010 data, corresponding to an integrated luminosity of 40 pb^-1, dimuon trigger path with no pT threshold:

pdf