Summary of EPS Conference 2013 Jimmy M c Carthy University of - PowerPoint PPT Presentation

Summary of EPS Conference 2013 Jimmy M c Carthy University of Birmingham 27/11/2013 The 2013 European Physical Society Conference on High Energy Physics Stockholm, Sweden, 18-24 July, 2013 J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 1 / 44

Introduction Summary of EPS-HEP 2013 MANY results presented over 6 days This is a biased summary The conference: Stockholm, Sweden, 18-24 July, 2013 Highlights: Reception at City Hall Invited talk from Peter Higgs Conference dinner at Vasa Museum J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 2 / 44

700 physicists present: J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 3 / 44

EPS HEPP Prize 2013 The 2013 High Energy and Particle Physics Prize, for an outstanding contribution to High Energy Physics, is awarded to the ATLAS and CMS collaborations,“for the discovery of a Higgs boson, as predicted by the Brout-Englert-Higgs mechanism”, and to Michel Della Negra, Peter Jenni, and Tejinder Virdee,“for their pioneering and outstanding leadership roles in the making of the ATLAS and CMS experiments”. J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 4 / 44

Higgs Physics Contents Higgs Physics 1 Top Physics 2 Heavy Ions 3 Flavour Physics 4 B 0 ( s ) → µ + µ − b → sll transitions Λ 0 b → Λ η ( ′ ) Conclusions 5 J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 5 / 44

Higgs Physics Higgs Physics New Boson discovered July 2012. Is it the Higgs Boson? Enough statistics now to start measuring. Phys. Lett. B 716 (2012) 1 Phys. Lett. B 716 (2012) 30 J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 6 / 44

Higgs Physics High statistics decay channels ATLAS Collaboration, arXiv:1307.1427 CMS PAS HIG-13-002 Events/5 GeV H → ZZ 40 Data 2011+ 2012 ATLAS SM Higgs Boson → → H ZZ* 4l m =124.3 GeV (fit) 35 H s = 7 TeV ∫ Ldt = 4.6 fb -1 Background Z, ZZ* s = 8 TeV ∫ Ldt = 20.7 fb -1 Both experiments now have Background Z+jets, t t 30 Syst.Unc. 6.6 σ (4.4 σ exp.) > 6 σ in this channel alone. 25 m = 20 High resolution channel. 15 10 m H = 124 . 3 +0 . 6+0 . 5 − 0 . 5 − 0 . 3 GeV 5 0 100 150 200 250 6.7 σ (7.2 σ exp.) m [GeV] 4l 2 Events / 2 GeV 10000 [fb/GeV] ATLAS H → γγ ATLAS Preliminary data syst. unc. 1.8 Data 2011+2012 8000 SM Higgs boson m =126.8 GeV (fit) gg → H NLO+PS ( P OWHEG + P Y 8 ) + X H 1.6 H Bkg (4th order polynomial) gg → H NNLO+NNLL ( ) + X H T HR ES 1.0 p 6000 1.4 / d High backgrounds. X H = VBF + VH + t H t H → γ γ fid 1.2 4000 σ H → , s = 8 TeV γ γ d ∫ -1 1 s = 7 TeV Ldt = 4.8 fb ∫ -1 L dt = 20.3 fb 2000 m H = 126.5 GeV Sensitive to spin. ∫ 0.8 -1 s = 8 TeV Ldt = 20.7 fb signal significance: 0.6 Events - Fitted bkg 500 7.4 σ observed 400 0.4 300 4.3 σ expected CMS show similar results. 200 0.2 100 0 0 -100 OWHEG -200 Some tension in differential 100 110 120 130 140 150 160 m [GeV] Ratio to P γ γ 2 production spectra. 0 0 20 40 60 80 100 120 140 160 180 200 Particle level p [GeV] T γ γ J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 7 / 44

Higgs Physics Associated production Starting to add different production mechanisms into the mix. Associated production with a vector boson (VH). Observed in WH channel. Other mechanisms (i.e. VBF): searched still ongoing. Adding VH(WW) 35 SM ✦ A bit extra help from the VH(WW) in 3- median expected CMS preliminary Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013 σ expected ± 1 σ -1 L = 19.5 fb s = 8 TeV / 30 expected ± 2 σ lepton (ATLAS+CMS), 4-lepton σ observed 95% CL limit on 25 (ATLAS), and lljj (CMS) final states CMS PAS HIG-13-009 20 ✦ ATLAS: combination with the H(WW) 15 V(jj)H(WW) analysis: 10 ๏ 4.0 σ (3.8 σ exp.) significance at 5 m H = 125 GeV eV 110 115 120 125 130 135 140 Higgs mass (GeV) ATLAS-CONF-2013-075 SM SM ATLAS Preliminary liminary VH VH → → VWW VWW → → 3 or 4 leptons 3 or 4 leptons σ observed CMS preliminary σ 10 2 10 2 Obs. / / σ σ ∫ -1 median expected VH → 3l3 ν (shape-based) s = 7 TeV: Ldt = 4.7 fb 95% CL Limit on Exp. 95% CL limit on expected ± 1 σ L = 4.9 fb -1 (7 TeV) + 19.5 fb -1 (8 TeV) s = 8 TeV: ∫ Ldt = 20.7 fb -1 ± 1 σ expected ± 2 σ ± 2 σ W(l ν )H(WW) + CMS PAS HIG-13-009 10 Z(ll)H(WW) 10 W(l ν )H(WW) 1 1 25 110 120 130 140 150 160 170 180 190 200 Slide 110 120 130 140 150 160 170 180 190 200 m [GeV] Higgs mass [GeV] H J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 8 / 44

Higgs Physics Spin-Parity measurements Spin-Parity of the SM model Higgs boson should be J P = 0 + . Test against various hypotheses: 0 − , 1 + , 1 − , 2 + . -1 -1 CMS preliminary s = 7 TeV, L = 5.1 fb s = 8 TeV, L = 19.6 fb Normalised to unity Pseudoexperiments ATLAS 0.1 + 0.25 Data 0 → → H ZZ* 4l - 0 P + J = 0 ∫ s = 7 TeV Ldt = 4.6 fb -1 CMS data 0.2 0.08 P - ∫ -1 J = 0 s = 8 TeV Ldt = 20.7 fb J = 1 states disfavoured by 0.15 0.06 Landau/Yang. 0.1 0.04 Observation of H → γγ . 0.05 0.02 H → ZZ used to rule out 0 -15 -10 -5 0 5 10 15 J P = 0 − 0 -30 -20 -10 0 10 20 30 q � � ��� -2 × ln(L / L ) - 0 + 0 q -1 -1 CMS preliminary s = 7 TeV, L = 5.1 fb s = 8 TeV, L = 19.6 fb ATLAS at 97.8% C.L. Probability density + 0 0.1 + 2 (gg) m CMS data CMS at 99.8% C.L. (CL obs. = 0.6%) 0.08 s Graviton-like J P = 2 + ruled out. 0.06 0.04 ATLAS > 99.9% ( γγ + ZZ + 0.02 WW ) 0 -30 -20 -10 0 10 20 30 � � ��� -2 × ln(L / L ) + 0 + CMS 99.4% ( ZZ + WW ) 2 (gg) m Both experiments favour SM quantum numbers. J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 9 / 44

Higgs Physics Signal Strength µ = σ/σ SM � (stat) -1 -1 ATLAS Total uncertainty s = 7 TeV, L ≤ 5.1 fb s = 8 TeV, L ≤ 19.6 fb � (sys) m = 125.5 GeV � 1 � on � -1 Tevatron Run II, L � 10 fb H CM CMS Preliminary m = 125.7 GeV � (theo) Combined Combined int H m H =125 GeV/c 2 + 0.23 arXiv:1307.1427 µ µ = 0.80 = 0.80 ± ± 0.14 0.14 p p = 0.65 H � � � - 0.22 H SM + 0.17 + 0.33 - 0.13 � = 1.55 Combined (68% C.L.) Combined (68% C.L.) ) + 0.17 - 0.28 - 0.12 H → bb + 0.35 arXiv:1307.1427 Single channel Single channel = 1.15 0.62 H � ZZ* � 4l - 0.32 µ ± + 0.20 + 0.40 - 0.13 � = 1.43 + 0.17 H � � � - 0.35 - 0.10 H → τ τ + 0.20 arXiv:1307.1427 H � WW* � l � l � - 0.21 µ = 1.10 ± 0.41 + 0.23 + - 0.31 - 0.19 H W W = 0.99 + � � + 0.15 - 0.28 - 0.09 H → γ γ Combined Combined + + 0.13 0.13 arXiv:1307.1427 arXiv:13 arXi arXi arXi v:13 v:13 v:1307.1 07.1 07.1 07.1427 427 427 427 + - - - 0.14 0.14 H � � � H H � � � � � � , ZZ*, WW* , ZZ*, WW* + + 0.17 0.17 µ = 0.77 ± 0.27 + + 0.21 0.21 - - 0.13 0.13 � � = 1.33 = 1.33 + + 0.12 0.12 - - 0.18 0.18 - - 0.10 0.10 VH � Vb b H → WW ATLAS-CONF-2013-079 -CONF-2013-079 9 W,Z H � b b � 0.5 µ = 0.68 ± 0.20 Preliminary � 0.4 ���� + 0.7 � = 0.2 <0.1 0 1 2 3 4 5 6 7 8 9 10 - 0.6 H → ZZ H � � � (8TeV: 13 fb -1 ) ATLAS-CONF-2012-160 S-CON NF-2012- 01 012 012 012 01 160 60 Best Fit ( � � Br)/SM µ = 0.92 ± 0.28 Preliminary + 0.7 � = 0.7 - 0.6 0 0.5 1 1.5 2 2.5 -0.5 0 0.5 1 1.5 2 � Best fit σ / σ s = 7 TeV � Ldt = 4.6-4.8 fb -1 SM Signal strength ( � ) s = 8 TeV � Ldt = 13-20.7 fb -1 • ��������� µ � � ����������������������������������������������� – ������� γγ �������������������������������� µ ���������������� ������ � ���������������������� ττ �� – ������ γγ , ττ ������������������������� µ ���������������� – �������������� γγ , ττ ������������������ µ ����������������� ��������������������������������������������������������� � �������� ��������������������������������������� ��� J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 10 / 44

Top Physics Contents Higgs Physics 1 Top Physics 2 Heavy Ions 3 Flavour Physics 4 B 0 ( s ) → µ + µ − b → sll transitions Λ 0 b → Λ η ( ′ ) Conclusions 5 J. McCarthy (University of Birmingham) Summary of EPS 2013 27/11/2013 11 / 44