LHC ATLAS W µν Z µµ

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1 7TeV / 01 / 20

2 LHC ATLAS W µν Z µµ

3

4 pp pp SppS (CERN): UA1 UA2 s = 0.63 TeV Tevatoron (Fermilab): CDF D0 s = 1.8, 1.96 TeV RHIC (BNL): PHENIX s = 0.5 TeV W µν ATLAS Z µµ ATLAS Tevatoron Tevatoron SppS SppS PHENIX LHC (CERN): ATLAS s = 7 TeV

5 Next- to- Next- to leading order (NNLO) PDF (MSTW 2008 NNLO) + (FEWZ) 5 % PDF α s ~ : < 2.5 % Fi^ng parameter (90 % C.L.): < 3.5 % Renormaliza`on and factoriza`on scale : < 1.0 % MSTW NNLO 2008 (68 % C.L) C. Anastasiou et al. [arxiv:hep- ph/ ] Z rapidity 5

6 Z µµ W µν High- p T Z µµ + N. Besson et al. [arxiv: ] Z W / Z Z L = 10 j - 1 pseudo - data CTEQ6.1 PDF (max. uncertainty) Z rapidity

7

8 N sig ATLAS N bg A acceptance geometrical / kinema`cal acceptance (MC ) C correc`on factor (MC ) L int

9 Z µµ W µν Z µµ y µ W µν y µ x x µ ν 2 high- p T isolated Z 66 < M µµ < 116 GeV 1 high- pt isolated E T miss m T

10 W / Z Z ττ W τν µνν High- p T QCD di- jet

11 *Default set: PYTHIA (event generator)+ MRST LO* (PDF)

12 scale factor ε data : ε MC :

13 pp σ vis pp 1. Van der Meer Scan x y 2 x 2 pp LUCID: Al. tubes filled with C 4 F < η < 6.0, z = 17 m 5 % Δx σ vis = 40.2 ± 0.1 (stat) ± 4.4 (= 11%, syst) z Δx Beampipe

14

15 Large Hadron Collider (LHC)

16 ATLAS ( η <2.7, 5m < r < 10m) : + x y z Proton (3.5TeV) η = - ln (tan(θ/2)) Proton (3.5TeV) ID ( η <2.5, r< 1150mm, B=2T): TRT σ/p T ~ 0.05 % p T (GeV) 1 % ( η < 3.2, 1500mm < r < 1970mm): Pb-LAr ( η <4.9, 2280mm < r < 4250mm): : σ/e ~ 10 %/ E 0.7 % ( η < 1.7) Cu / W-LAr ( η > 1.7) : σ/e ~ 50 %/ E 3 %

17 Inner Detector: ID 2.0 T Pixel Detectors (Pixel) η < / track 10µm (Rφ), 115µm (z) Semiconductor Trackers (SCT) η < / track 17µm (Rφ), 580µm (z) Transi`on Radia`on Tubes (TRT) η < / track 130µm

18 Muon Spectrometer:MS Inner + Middle + Outer η < 2.7 Monitored Driw Tubes MDT η < µm Cathode Strip Chambers CSC 2.0 < η < 2.7 for inner only 60µm η < 2.4 Thin Gap Chamber TGC 1.05 < η < 2.4 Resis`ve Plate Chamber RPC η < 1.05 η = 1.05 µ + µ

19 ID < 10 GeV MS ID MS

20 3 R1, 2, 3 or TGC1, 2, 3 2 η φ δη δφ δ p T δη δφ LUT look up table p T 6 δ

21 E T miss ( E cell /σ noise ) > 4 3 hadron- like / em- like p T

22 W µν LHC OK ID OK OK OK W / Z p T = 6 GeV W µν : 310 nb -1 Z µµ : 331 nb

23 MC MC PYTHIA (POWHEG for z) + MRST LO* Geant4 + + NNLO QCD di- jet Z µµ W µν pile up ~2 minimum bias Process Generator S x BR (nb.) Z µµ (m ll > 66 GeV) PYTHIA 0.99 ± 0.05 W µν PYTHIA ± 0.52 Z ττ (m ll > 66 GeV) PYTHIA 0.99 ± 0.05 W τν µνν PYTHIA 3.68 ± 0.18 z POWEG 0.16 ± 0.01 QCD di- jet (1 muon with p T > 8 GeV) PYTHIA

24 QCD p T > 20 GeV MC QCD 0.61 ± 0.01 (stat.) ±0.23 (syst) E t miss > 25 GeV 0.21 or : 0.04 : 0.08 E T miss

25

26 p T = 6 GeV TGC RPC 2 A. B. Z µµ &

27 A. jet muon µ π

28 η < 2.4 p T > 20 GeV p T MS > 10 GeV p T ID p T MS < 15 GeV z 0 < 10 mm π p T MS p T p T ID ID p T z 0 : z

29 φ p T endcap η endcap µ+ & µ- µ+ barrel barrel Endcap (+: 1187, - : 1120) Barrel (+: 1670, - : 1503)

30 η φ endcap φ barrel barrel endcap y x RPC

31 barrel endcap

32 MC MC W µν MC 8% : scale factor p T > 20 GeV p T > 20 GeV endcap barrel

33 Endcap (%) Barrel (%) p T = 20 GeV π * *2 * W / Z η scale factor 1. p ID T - p MS T 20±5GeV 2. or p T 3. ΔR = 3 σ ± 1σ

34 B. Z µµ 2 & endcap: (stat) barrel : (stat) 109 Z µµ = 218 Z µµ

35 W / Z

36 W/Z 1 > 2 z < 150 mm E T miss W µν < 0.01 % high- p T p T > 15 GeV η < 2.4 p T MS > 10 GeV p T ID p T MS < 15 GeV z0 < 10 mm z W µν Z µµ MC ~ 0.2 %

37 W µν

38 W µν p T > 8 QCD MC W µν 7. p T > 20 GeV 8. Isolated 9. E miss T > 25 GeV 10. M T > 40 GeV W µν = 1181 (W+: 709, W- : 472)

39 ΔR < 0.4 ID p T p T 0.2 W µν

40 W µν QCD : QCD non- QCD Isola`on N loose : Isola`on (1272) N isol : W µν (1181) ε nonqcd : W / Z isolated Z µµ (syst) ε QCD : QCD isolated 15 < pt < 20 GeV : (stat) non- colliding bunch ε = 1.1±0.2 (stat) ±10 (stat) mb mb 310 nb - 1 = 1.7±0.8 (stat) MC

41 W µν E T miss M T E T miss QCD

42 W µν QCD

43 W µν Z µµ :1.2 % : 0.2 % 1.0 % : 1.5 % : 1.0 %

44 W µν 1181 W+: 709 W- : ± 10.9 (syst) W+: 56.4 ± 6.5 (syst) W- : 47.1 ± 4.6 (syst) A C : ± (syst) W+: ± (syst) W- : ± (syst) : 310 ± 34(syst) nb

45 Z µµ

46 Z µµ pt > 8 QCD MC Z µµ isolated < M µµ < 116 GeV Z µµ =

47 Z µµ MC total:

48 Z µµ QCD pt log linear p T 66 < M µµ < 116 GeV

49 Z µµ Breit Wigner χ 2 C 1 = C 2 = p162 Δχ 2 C 1 =0.99, C 2 =0.07, χ 2 = 0.49 C 2 Δχ 2 =1 χ 2 C

50 Z µµ QCD

51 Z µµ Z µµ :0.5 % : 0.5 % 2.0 %

52 Z µµ ± A C : ± : 331 ± 36(syst) nb

53

54 s W µν Z µµ W µν W µν ATLAS Z µµ ATLAS Tevatoron Tevatoron SppS SppS PHENIX

55 1 pb pb j j - 1 s = 7 TeV QCD Z µµ PDF anomalous TGC W H WW, H ZZ

56 s = 7 TeV W / Z LHC W / Z 4 300nb - 1 ATLAS W / Z ATLAS ATLAS Z µµ & ATLAS

57

58 TGC TGC L1_MU6 MC ~8 % MC TGC 100 % MC 3 % Red : Blue : MC (, pt=15gev) Black : Tuned MC (, pt=15gev) TGC MC Tuned MC L1_MU / / / TGC

59

60 TGC RPC

61 effect of surrounding jets (isola`on effect) Track pt Isola`on calo ET Isola`on µ from jets prompt µ TGC, RPC: hit coincidence based addi`onal hits by muons from jets may deteriorate the efficiency efficiency vs isola`on cut ptcone40/ pt (the one used in the W / Z analysis) f(x) = a*x + b: a = flat! b =

62 η B η W / Z endcap / barrel 1. η 3. MC W / Z : < 0.5 % (φ )

63 L1 η < η φ E T η φ = ±

64 Topological clustering 3D topological clustering Grouping together neighbouring energy deposits based on their significance t seed : cells are used as seed t neighbor : cells can be used as addi`onal seed t cell : cells are added to neighbor cluster find local maxima: (E cell > 500 MeV, N neighbor > 3) Re- arrange (split): 1.6 par`cle in one cluster on average awer spli^ng 3D, using all calorimeters Electronics Noise (MeV) Cell sigma noise η

65 Local hadronic calibra`on Classify hadron- like /em- like by shape variables Weigh`ng step(w): for hadron- like clusters Invisible: break- up of nuclear bindings Escape: neutrino or muon Out- of- cluster step(ooc): for hadron- like clusters (E, η, λ) energy discarded by he clustering alg. by noise thre. Dead Material (DM): for both - correc`on of energy outside the ac`ve calo depending on region pure EM λ center : depth of shower center ρ cell : cell energy density E clus : cluster energy pure had. probability weight for π0 cluster for 8 GeV < E cluster < 16 GeV Hadronic cell weights for Tile barrel sampling 1 at 0.2 < h <

66 E T miss Topocluster energy scale (1.5 %) E/p study topocluster MC/Data E T miss >25 GeV ~ 1.5 % E/p as a func`on of isolate tracks. The energy is measured within a cone of ΔR =2 E T detector response 1.0 % Truth E T reconstruc`on(localhadtopo)

67 An`- kt algorithm Topological Clustering cluster input p T cluster (i) : d ii =p - 2 Ti, cluster d ij =min(p - 2 Ti,p - 2 Tj ) x ΔR ij2 /D 2 j cluster, D: jet size=0.4 j d min =min(d ii,d ij ) : d min = d ii - > cluster (i) jet d min = d ij - > i j Cone D:paremeter Jet Size = 0.4 Jet ΔR~0.4, fix Collinear/Infrared radia`on safe K T Cone Algorithm

68 CMS

69 LHC Duoplasmatron: 100kV 100kV

70

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