ATLAS in Run 2: from the isolation of the muons to the measurement of the cross section of the Higgs boson decaying into four leptons.

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1 ATLAS in Run 2: from the isolation of the muons to the measurement of the cross section of the Higgs boson decaying into four leptons. Arthur LESAGE IRFU days 2016

2 The thesis project : École d Ingénieur Supélec : Degree in Fundamental Physics at the Université Paris Sud XI : MPhil in Physics (Semiconductor physics) at the Cavendish Laboratory, Cambridge (UK) : PhD thesis with the CEA (Saclay) / DSM / IRFU / SPP (ATLAS group). Based at CERN. Under the supervision of Mrs. Rosy Nikolaidou. - Study of the muon isolation for Run 2 (qualification task). - Study of the cross section of the Higgs boson decaying into 2 Z bosons decaying into four leptons (analysis). H! ZZ! 4`, ` 2 {e, µ} 08/07/16 Arthur Lesage - IRFU Days

3 The ATLAS experiment Overview LHC, proton-proton collisions: Run 1 from 2010 to 2013: fb-1 recorded by ATLAS at 7 TeV fb-1 recorded by ATLAS at 8 TeV. Run 2 from 2015 to 2018: fb-1 recorded by ATLAS at 13 TeV (2015). - About 10 fb-1 recorded by ATLAS at 13 TeV so far (2016). CMS LHC ALICE p Pb LHCb SPS ATLAS PS ATLAS is a general purpose experiment. A large part of the physics programme is dedicated to the Higgs physics. 08/07/16 Arthur Lesage - IRFU Days

4 The ATLAS experiment The sub-detectors How the muons, the key particle of my thesis, are reconstructed by the ATLAS detector? 08/07/16 Arthur Lesage - IRFU Days

5 The ATLAS experiment Muon reconstruction The three sub-detectors are used: Mainly Muon Spectrometer (MS) and Inner Detector (ID). At a lesser extent, the Calorimeters (Calo). MS Calo-HA Calo-EM E loss Several types of muon are reconstructed: ID IP - Combined: a track in the MS matches one in the ID. - Calorimeter-Tagged: tracks in the ID match clusters in the Calo. - Extrapolated: tracks in the MS are extrapolated to the interaction point (IP) taking into account the energy loss in the Calo. 08/07/16 Arthur Lesage - IRFU Days

6 The muon isolation The isolation aims at measuring the activity surrounding the trajectory of a particle in the detectors. Signal: well isolated objects. Discriminating signal / background 08/07/16 Arthur Lesage - IRFU Days

7 The muon isolation Calculation (tracking) Two kinds of isolation: Track isolation: summing up the transverse momentum of the tracks surrounding the track of the particle in the ID. t t t ID λ t ϕ η 08/07/16 Arthur Lesage - IRFU Days

8 The muon isolation Calculation (calorimetry) Two kinds of isolation: Calorimetric isolation: summing up the energy deposits surrounding the trajectory of the particle in the Calo, removing the energy deposited by the particle itself. Calo-HA Calo-EM ϕ la figure, l objet η dont l isolation est dé 08/07/16 Arthur Lesage - IRFU Days

9 The muon isolation The Background distributions parameterization for the J/ψ fit as well as increased muon p T cut (from 5 to 7 GeV) to reduce the weight of the contribution of low-p T muons. with the data w ing the overall Abetterdem tum calibration Entries / 0.60 GeV ATLAS -1 s = 13 TeV, 2.7 fb Z µµ Data MC MC (uncor.) Syst. uncert. Entries / 0.01 GeV ATLA s = 13 J/ψ µ Track Z peak Fig. 7 Distributions of the track-based (left) and the calorimeter-based (right) relativeisolationvariablesmeasuredinz µµ events. Muons are selected by the Medium identification algorithm. The dots show the distribution for data while the histograms show the distribution from Table 2 Definition of the seven isolation working points. The discriminating variables are listed in the second column and the criteria used in the definition are reported in the third column Calo r-based Muons Signal Background Isolation WP Discriminating variable(s) Definition LooseTrackOnly Loose Tight Gradient Page 11 of simulation. The bottom panels show theratioof datatosimulationwith J/ψ µµ (right) candidate events reconstructed with CB muons. the corresponding The upper panelstatistical show the invariant uncertainty. mass distribution The pile-up for data and reweighted for simulated distribution the signal simulation is normalised plus the background to the number estimate. The of events points show selected in data p varcone30 T /p µ T 99 % efficiency constant in η and p T pt varcone30 /p µ T, Etopocone20 T /p µ T 99 % efficiency constant in η and p T pt varcone30 /p µ T, Etopocone20 T /p µ T 96 % efficiency constant in η and p T pt varcone30 /p µ T, Etopocone20 T /p µ T 90(99) % efficiency at 25 (60) GeV GradientLoose T /p µ T, Etopocone20 T /p µ T 95(99) % efficiency at 25 (60) GeV simulation. The bottom panels FixedCutTightTrackOnly show theratioof datatosimulationwith pt varcone30 /p µ T pt varcone30 /p µ T the corresponding statistical uncertainty. The pile-up reweighted simu- < 0.06 p varcone30 08/07/16 Arthur Lesage - IRFU Days Data/MC m µµ [GeV] Fig. 9 Dimuon invariant Z mass! distribution µµ of Z µµ (left) and the data. The continuous line corresponds to the simulation with the MC momentum corrections applied while the dashed lines show the simulation when no correction is applied. Background estimates are 123 µ topocone20 µ µ topocone20 µ Data/MC added to the sign systematic uncer panels show the d samples are adde sections. In the J the data as descri distributions is n In order to study the isolation variables, muon pairs from Z decays are selected.

10 The muon isolation The working points Efficiency: number of muons passing the isolation cuts divided by the total number of reconstructed muons. Scale factors: ratio of efficiencies in data and MC. 08/07/16 Arthur Lesage - IRFU Days

11 The muon isolation When two objects are too close (boosted decays), the activity of one object is counted in the isolation of the other and vice-versa. Correction for close-by objects This increase of activity causes a higher rejection, even for signal events. λ λ ϕ η Therefore, a tool has been implemented, which calculates the correction to remove to the isolation variables to account for close-by objects: the rejected signal should be recovered. 08/07/16 Arthur Lesage - IRFU Days

12 The muon isolation Summary Initially intended for my qualification task. Each time more data is available (used by the whole ATLAS collaboration): We check the comparison data / MC. We calculate the efficiencies of the working points. We derive the scale factors. In parallel, I have developed the tool for the correction for close-by objects. Growing interest in the collaboration! Working on optimising the isolation variables. 08/07/16 Arthur Lesage - IRFU Days

13 The Higgs in Run 2 The Higgs mechanism Imagine a room full of physicists, quietly chattering. This is the space filled with the Higgs field only. A rumour crosses the room and creates 08/07/16 A well-known lady walks in, creating a disturbance as she moves across the room: admirers cluster around. She acquires mass, just like a particle moving through the Higgs field. the same kind of clustering, but among the scientists themselves. This is the Higgs boson. Arthur Lesage - IRFU Days

14 The Higgs in Run 2 From Run 1 to Run 2 Run 1 data taking During Run 2, it is expected: Discovery - to test the validity of the Standard Model Higgs mechanism. Ø Beyond Standard Model physics? - to precisely measure the properties of the Higgs. Run 2 + PhD thesis 08/07/16 Arthur Lesage - IRFU Days

15 The Higgs in Run 2 My group of analysis Production of the Higgs with centre of mass energy. H Z Z* 08/07/16 Arthur Lesage - IRFU Days BR for SM Higgs ' ' _ bb τ + τ cc _ gg 125 GeV γγ Zγ WW ZZ Higgs Mass tt - (GeV) H! ZZ! ` ``0 `0, (`, `0) 2 {e, µ} 2 Possible final states: Branching ratios of the Higgs. 4µ, 2µ2e, 2e2µ, 4e

16 Study of the cross-section The fiducial selection Lepton defintion Muons: p µ T > 5 GeV, µ < 2.7 Electrons: p e T > 7 GeV, e < 2.47 Pairing Leading pair: SFOS lepton pair with smallest m Z m`` Sub-leading pair: Remaining SFOS lepton pair with smallest m Z m`` Event selection Lepton kinematics: Leading lepton p T > 20, 15, 10 GeV Mass requirements: 50 < m 1,2 < 106 GeV; 12 < m 3,4 < 115 GeV Lepton separation: R`i,` j > 0.1(0.2) for same (opposite) flavor leptons J/ veto: m`i,` j > 5 GeV for all SFOS lepton pairs Mass window: 115 < m 4` < 130 GeV This selection aims at imitating the selection performed on real reconstructed events. The selection of reconstructed events include the FixedCutLoose isolation working point for muons and cuts on the impact parameter.! Events/2.5 GeV Data (*) Background ZZ Background Z+jets, tt Signal (m =125 GeV) H Syst.Unc. H Z Z* ATLAS ' ' Preliminary (*) H ZZ 4l -1 s = 7 TeV: Ldt = 4.6 fb s = 8 TeV: Ldt = 20.7 fb m 4l [GeV] 08/07/16 Arthur Lesage - IRFU Days

17 Study of the cross-section Definitions I work on the measurement of the total and fiducial cross-section (XS) of the Higgs into 4 leptons. The total cross-section is given by: ± Number of observed signal events tot = A C R L int The fiducial XS (corresponding L to the volume associated to the selection): fid 4` = C L int The total and fiducial XS are linked: tot 1 fid = 4` A R, as: 08/07/16 Arthur Lesage - IRFU Days N s N s Branching ratio Integrated luminosity

18 Study of the cross-section The factors Two factors (introduced in the previous equations) are used: Physics space Signal Acceptance Reconstruction Background C l The acceptance factor: assesses the acceptance A of the detector. A = N Fid N Tot. The correction factor: assesses the performance of the reconstruction. C l = Nl Reco. N l Fid. Number of selected events (from generator particles). Number of generated events. Number of selected events (from reconstructed particles). Number of selected events (from generator particles). 08/07/16 Arthur Lesage - IRFU Days

19 Fiducial acceptance, A Not Not reviewed, for for internal interna cir Detector correction factor, C ATLAS Preliminary ATLAS Preliminary 0.9 Simulation Inclusive 2e2µ Simulation Inclusive 2e2µ s = 13 TeV, m = GeV 4µ MC stats Higgs boson s = 0.49 mass TeV, m = GeV (old mass unc.) H H 0.8 4µ H ZZ* 4l 4e H ZZ* 4l Table 8: Summary 2µ2e of the systematic uncertainties. Signal composition The 8 TeV mass 0.49 uncertainties C = ± 4eare based on the A = ± µ2e BR certainty. The 5% for the leptons is an estimate, 0.7 since the prerecommendation scale factors have 1-2lnΛ Not reviewed, for internal circulation onl MC stats Acceptance 0.69 factors µ R and µ f Luminosity Experimental, Acceptance leptons factors Higgs boson mass (old mass unc) 0.47 Signal composition MC stats Acceptance factors µ R and µ f PDF Study of the cross-section PDF The results 1.56 (EOY ) 0.98 µ R and µ f PDF Higgs boson mass (old1.56 mass unc.) Higgs Signalboson composition mass (old0.02 mass unc.) Signal BR composition MC BR stats In 2015, the A and C factors have been calculated at 13 TeV. 0.5 Table 8: Summary of the systematic uncertainties. The 8 TeV mass uncertainties are based on the MC stats certainty. and do notthe allow 5% forathe reliable leptons data is an fit. estimate, 0.6 since the prerecommendation scale factors have and do not allow for Table a reliable 8: Summary data fit. of the systematic uncertainties. The 8 TeV mass uncertainties are based o certainty. The 5% for the leptons is an estimate, since the prerecommendation scale factors h 0.35 Table 9: Theoretical predictions and do not allow for for thea reliable total cross data 0.4 fit. section tot theor. as a function of the three centres Table considered 9: Theoretical in this analysis predictions [15]. for the total cross section tot theor. as a function of the three centres ggf+bbh VBF considered WH in this ZH analysis tth [15]. ggf+bbh VBF p WH ZH tth Table 9: Theoretical predictions for the total cross psection s tot 10 theor. as a function of the three ce ATLAS considered Preliminary in this analysis 73σ TeV[15]. Theoretical s 8 TeV predictions: 9 H ZZ* 4l (b) p 13 TeV tot TeV, 3.2 fb s This allows to 17.5 TeV ± 1.6 pb 22.3 ± TeV pb theor TeV observed 7 TeV 7 expected Figure 7: Fiducial acceptance factors (a) and detector correction factors (b) for m 6 H = GeV at p 8 TeV 4.4 pb tot 17.5 ± 1.6 pb 22.3 ± 2.0 pb TeV theor tot ± 1.6 pb 22.3 ± 2.0 s = pb 13 TeV infer the pb 50.9 theor pb for di erent production modes and separated by final state. Uncertainties are statistical only Results from TeV fiducial 2σ 446and Results 4 from TeV Results from 8 TeV 3 e ects. total The factors are shown in Fig. 7(b) for the four final states and a function of the production mode 2 for p cross- The fiducial cross section 447 The TeV data are refitted at H GeVMeasurements and the extracted number at 8 TeV: of signal event s = 13 TeV. 447 The The lower 8 TeV e ciency data 447 1σ 1 for arethe The refitted tth 8 TeV production at data m are refitted modeat ismdue H = to the isolation GeV andrequirement the extracted number and of signal e thesections. higher jet activity. inclusive 0 detector 0 2 correction 4 6 factors 8 10 averaged over final states and production modes are also given in Table 8 for p The fiducial corresponds H = cross section tocorresponds fid GeV and the to fid 4` = (stat.) ` extracted 0.47 (stat.) number of signal event (syst.) lumi (syst.) fb lumi. whi The fiducial fb section tot cross section BR s = 7 section fid corresponds TeV, 8 ( TeV tot = and A BR 13 fid N s TeV. 4` ) is found to be tot = ` is found to to fid be tot ` = (stat.) (stat (syst.) lumi. fb whi syst. 8.3 (stat. lumi) syst. pb lumi) and pbin section ( tot = A BR fid a 450 the theoretical prediction 450 the theoretical 4` shown ) is found prediction in Tab. to 9. be tot = shown in Tab (stat. syst. lumi) pb and in 450 the theoretical prediction shown in Tab. 9. Table 08/07/16 8: Summary of the inclusive acceptance Arthur factors Lesage (A) and- IRFU the inclusive Days 2016 detector correction factors (C) in % as 19

20 Conclusion A lot to do! Continuing the study of the muon isolation with new data coming. The scale factors are used and will be used by the entire ATLAS collaboration. Already one paper published: %2Fs y The tool for the correction of isolation is growing in interest. Measuring the cross section of the Higgs boson decaying into four leptons. I am responsible for a note which is being prepared for ICHEP (Summer conference). For the end of the thesis, aiming at presenting the crosssection measurements with full 2015 and 2016 data at the Winter conferences. 08/07/16 Arthur Lesage - IRFU Days

21 Back-up slides For the more curious 08/07/16 Arthur Lesage - IRFU Days

22 The Higgs mechanism The production modes g t, b H Gluon-gluon fusion: dominant process at LHC. g q Vector boson fusion: sub-dominant process at LHC. W, Z W, Z H q H q q ( ) W,Z W, Z Associated production with W or Z bosons: was the dominant one at Tevatron. t g Associated production with top quarks: lower yields. g H t 08/07/16 Arthur Lesage - IRFU Days

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