CMS Muon Results

Contacts

Muon POG conveners (cms-phys-conveners-MUO@cernNOSPAMPLEASE.ch)

Plots and Results

Muon ID efficiencies in 2015 RunB data

* DPS with plots approved on 12 August 2015: ppt pdf

Muon Isolation Performance with the Pile Up Per Interaction (PUPPI) method on 13 TeV Montecarlo

* Collection of several PUPPI performance plots incl. muon isolation, approved on 5 August 2015: CMS DP-2015/034:

Collection of heavy flavor distributions with dimuons in 2015 RunB data

* DPS with plots approved on 20 July 2015: CMS DP-2015/018

Muon Reconstruction and Identification Improvements for Run-2 and First Results in 2015 RunB data

* DPS with plots approved on 20 and 21 July 2015: ppt pdf

Double muon trigger efficiencies in 2012 data

* DPS with plots : pdf

Muon ID performance: low-pT muon efficiencies

* DPS with plots approved on 18 June 2014: pptx pdf

Muon Identification performance: hadron mis-Id measurements and RPC Muon selections

  • DPS with approved performance plots: pptx pdf
    • pion and proton mis-ID probabilities, approved on 16 April 2014 (pion results supersede those contained in the previous note CMS DP-2013/024)
    • RPC Muon ID results and other pion and kaon mis-ID probabilities, approved on 19 February 2014

New Pion and Kaon misID results and momentum calibration plots

  • DPS with plots approved on 18 September 2013: pptx pdf

Single Muon efficiencies (Identification, Isolation and Trigger) in 2012 data

  • DPS with approved performance plots: ppt pdf
    • Identification and Isolation efficiencies in 2012 RunABCD data (approved on 27 February 2013)
    • Trigger Efficiencies in 2012 RunD data (approved on 13 March 2013)

Muon ID and Isolation efficiencies in 2012 RunAB data (52X)

  • DPS approved on 10th October 2012: ppt pdf

Muon isolation efficiency in 2011 data (@ L~1.1 fb-1)

  • Isolation efficiency vs pT 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.

PF-Tight_comb-PF-Iso-015_barrel_pT.png pdf PF-Tight_comb-PF-Iso-015_endcap_pT.png pdf PF-Tight_comb-PF-Iso-015_nVtx.png pdf

Muon trigger efficiency in 2011 data (@ L~1.1 fb-1)

  • 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 pT > 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

HLTMu30WrtL1Mu12VsEtaEPS11.png pdf HLTMu30VsEtaEPS11.png pdf

  • HLT_Mu30/L1Mu_12 (left) and L1_Mu12*HLT_Mu30 (right) efficiency vs. pT 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 pT > 35 GeV: 95.0% in data, 96.8% in MC; scale factor=0.982.

HLTMu30WrtL1Mu12VsPtBarrelEPS11.png pdf HLTMu30VsPtBarrelEPS11.png pdf

  • HLT_Mu30/L1_Mu12 (left) and L1_Mu12*HLT_Mu30 (right) efficiency vs. pT 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 pT > 35 GeV: 89.9% in data, 89.0% in MC; scale factor=1.01.

HLTMu30WrtL1Mu12VsPtEndcapEPS11.png pdf HLTMu30VsPtEndcapEPS11.png pdf

Muon identification efficiency in 2010 data

Efficiency of three benchmark muon selections as a function of muon pT in 2010 data (Lint = 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 pT < 20 GeV and from Z → μμ in the range of pT > 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.

TMOST_barrel.png pdf TMOST_endcaps.png pdf

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

PF_barrel.png pdf PF_endcaps.png 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.

VBTF_barrel.png pdf VBTF_endcaps.png pdf

Z → μμ invariant mass in 2010 data

Invariant mass distribution of Z → μμ candidates for Lint = 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.

Zmumu_35pb-1_lin.png pdf Zmumu_35pb-1_log.png pdf

Jacobian peak of W boson in 2010 data

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

Wmunu_35pb-1_lin.png pdf Wmunu_35pb-1_log.png pdf

Y(nS) → μμ invariant mass in 2010 data

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:

Y_40pb-1.png pdf

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

Y_40pb-1_etalt1.png pdf

Values correspond to Lint = 40 pb-1 Full rapidity range abs(η(muons)) < 1
Signal events Y(1S) 94161 564 23390 194
Signal events Y(2S) 28715 366 7298 133
Signal events Y(3S) 15109 330 3999 113

J/ψ → μμ and ψ(2S) → μμ invariant mass in 2010 data

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

JPsi_Psi2S40pb-1_barrel_Y05.png pdf

J/ψ → μμ invariant mass in 2010 data

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):

JPsi40pb-1.png pdf

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

JPsi40pb-1_endcap.png pdf JPsi40pb-1_endcap.png pdf

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

JPsi40pb-1_barrel_Y07.png pdf JPsi40pb-1_barrel_Y05.png pdf

Values correspond to Lint = 40 pb-1 Full rapidity range abs(y(J/ψ)) < 0.5 abs(y(J/ψ)) < 0.7 abs(y(J/ψ)) < 1.4 1.4 < abs(y(J/ψ)) < 2.4
Signal events (2267.2 1.9)⋅103 (120.5 0.8)⋅103 (172.3 0.5)⋅103 (571.3 1.2)⋅103 (1726.8 4.2)⋅103
Sigma (MeV/c2) 44.5 0.2 (stat.) 19.9 0.6 (stat.) 21.2 0.4 (stat.) 31.4 0.2 (stat.) 49.9 0.7 (stat.)
M0 (GeV/c2) 3.0967 0.0001 (stat.) 3.0978 0.0001 (stat.) 3.0975 0.0001 (stat.) 3.0968 0.0001 (stat.) 3.0961 0.0001 (stat.)
S/B (M0 2.5σ) 5.6 44 39 18 4.3
χ2/ndof 2.5 1.4 1.3 1.9 1.6

Invariant-mass spectra of opposite-sign muon pairs

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

dimuMass_2011Run_1fb_20July2011.png pdf

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

dimuonSpectrum_40pb-1.png pdf

Major results

Papers and PASes

CMS Notes

Performance Notes (collections of plots)

  • CMS DP-2015/047 First Muon Identification Efficiencies with 13 TeV, 50 ns Data. NEW
  • CMS DP-2015/015 Muon Reconstruction and Identification Improvements for Run-2 and First Results with 2015 Run Data. NEW
  • CMS DP-2014/038 Double Muon Trigger efficiency in 2012 data.
  • CMS DP-2014/020 Muon ID performance: low-pT muon efficiencies.
  • CMS DP-2014/018 Muon Identification performance: hadron mis-Id measurements and RPC Muon selections.
  • CMS DP-2013/024: New Pion and Kaon misID results and momentum calibration plots.
  • CMS DP-2013/009: Single Muon efficiencies in 2012 Data.
  • CMS DP-2012/025: Muon ID and Isolation Efficiencies in 2012 RunAB.
  • CMS DP-2010/039: Comparisons of the Fast Simulation with the first LHC data.
  • CMS DP-2010/020: Muons in minimum-bias events at 7 TeV: data-MC comparisons for a few basic kinematic distributions. Updated with more statistics on 19/07/2010: pdf, ppt.
  • CMS DP-2010/016: First two months of data taking at 7 TeV: J/ψ → μ μ, W → μ ν, Z → μ μ mass plots and displays of Z → μ μ candidates.
  • CMS DP-2010/005: Dimuons in CMS at 900 and 2360 GeV.
  • CMS DP-2010/001: Dimuons in 2009 collision data (pages 31-35).

Publications

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Topic revision: r1 - 2016-01-12 - CarloBattilana
 
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