The NA62 Experiment. Seminar at LPNHE, Paris, France. Mathieu PERRIN-TERRIN. February 4, CERN, Geneva, Switzerland.

The NA62 Experiment Seminar at LPNHE, Paris, France Mathieu PERRIN-TERRIN CERN, Geneva, Switzerland. February 4, 2016

Outline 1 Physics Case (10min) 2 The NA62 Experiment (25min) 3 Outlook of the First Data (10min) 4 Conclusions and Prospects Mathieu Perrin-Terrin (CERN) The NA62 Experiment 1/56

Physics Case (10min) A broad physics program The main target: K + π + ν ν but many more channels: keeping growing: axion search Mathieu Perrin-Terrin (CERN) The NA62 Experiment 2/56

Physics Case (10min) K + π + ν ν: a rare and clean decay Flavour Changing Neutral Current: no tree diagrams, hard GIM suppression u u u u s u,c,t d W ± Z 0 ν ν s u,c,t d W ± l W ± ν ν Very rare SM process [Buras, 1503.02693] B(K + π + ν ν) = (8.4 ± 1.0) 10 11 And very clean, we will see why... Mathieu Perrin-Terrin (CERN) The NA62 Experiment 3/56

Physics Case (10min) Anatomy of the Decay: Short and Long Ranges Virtual particles (VP) in loops are off-shell VPs propagate over t = 1/ E (uncertainty principle) QCD energy scale << EW energy scale hence: Short and long ranges scale separate naturally [Buras 9806471]: A(M F) = G F VCKM i 2 C i(µ) F Q i (µ) M i F Q i (µ) M long range, matrix elements, large uncertainties C i (µ) short range, Wilson coefficients Mathieu Perrin-Terrin (CERN) The NA62 Experiment 4/56

Physics Case (10min) Theoretical Uncertainties A(M F) = G F 2 VCKMC i i (µ) F Q i (µ) M Matrix Elements (normally large uncertainties) Derived from K + π 0 e + ν using isospin symmetry: Wilson Coefficients i π + ( sd) V A K + = 2 π 0 ( su) V A K + NLO QCD correction for top, NNLO for charm NLO EW correction for top & charm SM Predictions [Buras 1503.02693] B(K + π + ν ν) = (8.4 ± 0.3 ± 1.0 ext ) 10 11 Second error from external CKM inputs (V cb, γ) Mathieu Perrin-Terrin (CERN) The NA62 Experiment 5/56

Physics Case (10min) Testing the Standard Model B(K + π + ν ν) with 10% uncertainties allows to determine V td at 9% [Buras 0405132] With B(K + π + ν ν), B(K L π 0 ν ν) the CKM unitarity triangle can be built independently from B observables: Mathieu Perrin-Terrin (CERN) The NA62 Experiment 6/56

Physics Case (10min) Going Beyond the Standard Model Any 10% deviation from B SM would signal new particles (e.g. vector boson) contributions Even more sensitive to NP when using correlations with B(K L π 0 ν ν), B(B 0 s µµ), γ, B K(K )µµ, ɛ /ɛ A key observable for the LHC era 5 4 Straub:1012.3893 4.0 3.8 3.6 γ = 60 γ = 70 γ = 80 Buras 1503.02693 68% CL contours 3 3.4 2 1 0 0 1 2 3 4 3.2 3.0 2.8 Only CKM All inputs 2.6 5 6 7 8 9 10 11 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 7/56

) Physics Case (10min) State of the Searches -7 10 CNTR B787 Upper Limit at 90% CL Measurement ± 1σ E949 Measurements 2008 SM arxiv:1503.02693 ν ν + π + B(K -8 10-9 10 B787 B787 B787 B787 B787 B949 B949 Stopping kaon technique B(K + π + ν ν) = (1.73 +1.15 1.05 ) 10 10 Phys. Rev. D 77, 052003 (2008) -10 10 Phys. Rev. D 79, 092004 (2009) 1980 1985 1990 1995 2000 2005 2010 2015 year KOTO at JPARC aims to reach by 2020 the SM single event sensitivity for K L π 0 ν ν 1 1 B(K L π 0 ν ν) = (3.0 ± 0.3) 10 11 Buras 1503.02693 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 8/56

) Physics Case (10min) State of the Searches -7 10 CNTR B787 Upper Limit at 90% CL Measurement ± 1σ E949 Measurements 2008 SM arxiv:1503.02693 ν ν + π + B(K -8 10-9 10 B787 B787 B787 B787 B787 B949 B949 NA62? Stopping kaon technique B(K + π + ν ν) = (1.73 +1.15 1.05 ) 10 10 Phys. Rev. D 77, 052003 (2008) -10 10 Phys. Rev. D 79, 092004 (2009) 1980 1985 1990 1995 2000 2005 2010 2015 year KOTO at JPARC aims to reach by 2020 the SM single event sensitivity for K L π 0 ν ν 1 1 B(K L π 0 ν ν) = (3.0 ± 0.3) 10 11 Buras 1503.02693 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 8/56

Physics Case (10min) NA62 Goal Measuring B(K + π + ν ν) with 10% uncertainty in 2 years O(100) signal events and Sig/Bkg O(10) With a signal efficiency of 10%, it implies: 10 13 kaons in 2 years background rejection of 10 12 Use SPS: perfect for decay in flight technique Mathieu Perrin-Terrin (CERN) The NA62 Experiment 9/56

The NA62 Experiment (25min) Outline 1 Physics Case (10min) 2 The NA62 Experiment (25min) 3 Outlook of the First Data (10min) 4 Conclusions and Prospects Mathieu Perrin-Terrin (CERN) The NA62 Experiment 10/56

NA62 Collaboration The NA62 Experiment (25min) Mathieu Perrin-Terrin (CERN) The NA62 Experiment 11/56

NA62 Time Line The NA62 Experiment (25min) Proposal TD Test Pilot Physics Physics Physics Physics Reference Documents 2005 Proposal [CERN-SPSC-2005-013] 2010 Technical Design [NA62-10-07] 2014 Pilot Run [G. Ruggiero, CERN Seminar ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 12/56

NA62 Apparatus KTAG Giga BEAM > Tracker The NA62 Experiment (25min) Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto Secondary Beam from SPS 5s spill at 750 MHz counts / 3.5 ms 180 160 140 3 10 Mon 03 Aug 2015 18:35:35 Composition: p π + K + 70 24 6% 120 100 80 60 75 GeV/c with δp/p = 1% 40 20 0 0 1 2 3 4 5 6 7 t [s] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 13/56

NA62 Apparatus KTAG Giga BEAM > Tracker The NA62 Experiment (25min) Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Beam Instrumentation Kaon Tagging (KTAG, Differential Cerenkov N 2 or H 2 ) Kinematics (GigaTracker- GTK, Silicon hybrid pixels) Beam particle scattering detection (Guard Ring) Arrival time measurement Muon Veto Mathieu Perrin-Terrin (CERN) The NA62 Experiment 13/56

NA62 Apparatus KTAG Giga BEAM > Tracker The NA62 Experiment (25min) Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Decay Region 120m long, in vacuum (500 m 3 at 10 6 mbar) 10% of K + decay in the first 65m: 5MHz of K + decay, 4.5 10 12 /year Muon Veto Mathieu Perrin-Terrin (CERN) The NA62 Experiment 13/56

NA62 Apparatus KTAG Giga BEAM > Tracker The NA62 Experiment (25min) Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Decay Products Instrumentation Kinematics (Spectrometer) Photon Detection (ECAL) π and µ identification (RICH, HCAL and, Muon Veto) Arrival time measurement (all + CHOD for charged particles) Muon Veto Mathieu Perrin-Terrin (CERN) The NA62 Experiment 13/56

The NA62 Experiment (25min) K + π + ν ν Analysis Strategy Background Sources K + decay incorrectly reconstructed 1 dγ Γ tot dm m 2 K + µν(γ) K + π + π 0 (γ) Particle accidentally in time with a K + Analysis Main variable m 2 miss = p K p π 2 K + π + ν ν 10 10 K + πππ m 2 miss [GeV2 /c 4 ] Look for signal in regions I and II p π [15, 35] GeV/c (RICH, kinematics, γ rejection, accidental from π + µ + ν) Background suppression needed: Kinematics 10 4 Charged PID 10 7 π 0 s γ Rejection 10 8 Timing 10 2 1 dγ Γ tot dm m 2 K + π + π 0 (γ) K + µν(γ) K + eπν K + µπν K + π + ν ν 10 10 K + πππ K + π + π 0 π 0 K + π + π e + ν m 2 miss [GeV2 /c 4 ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 14/56

The NA62 Experiment (25min) Analysis Sensitivity (MC) Decay event/year K + π + ν ν(sm) 45 Total Background 10 K + π + π 0 5 K + µ + ν 1 K + π + π + π < 1 K + π + π e + ν + other 3 track decays < 1 K + π + π 0 γ IB 1.5 K + µ + νγ IB 0.5 K + π 0 e + (µ + )ν + others negligible Mathieu Perrin-Terrin (CERN) The NA62 Experiment 15/56

The NA62 Experiment (25min) KTAG - Kaon Identification and Timing KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Differential Cerenkov Detector Beam 75GeV/c PMT Diaphragm Muon Veto N 2 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 16/56

The NA62 Experiment (25min) KTAG - Performance count/20ps Time Resolution, σ(t) 80 ps < N PM >= 18 Preliminary 2014 Composition 1-1 10-2 10-3 10-4 10 π + K + 6-fold p 7-fold 8-fold 2012-5 10-6 10 t Hit t Cand K + Identification > 95% π +, p Rejection > 99.9% -7 10 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2 Pressure [bar] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 17/56

The NA62 Experiment (25min) GTK - Beam Particle Kinematics and Timing KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto Three Stations of Silicon Hybrid Pixel GTK1 GTK3 60 mm 75 GeV/c GTK2 GTK3 in lab 13.2m 9.6m Mathieu Perrin-Terrin (CERN) The NA62 Experiment 18/56

The NA62 Experiment (25min) GTK - Beam Particle Kinematics and Timing KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto Three Stations of Silicon Hybrid Pixel GTK1 GTK3 60 mm 75 GeV/c GTK2 GTK3 being installed 13.2m 9.6m Mathieu Perrin-Terrin (CERN) The NA62 Experiment 18/56

The NA62 Experiment (25min) A very innovative detector Specifications Beam Rate 800 MHz - 1GHz 1.3 MHz/mm 2 Radiation 10 14 1MeV eq. n cm/ 2 /y Momentum Reso 0.2% Angular Reso 16 µrad Hit Time Reso 200 ps RMS Material 3 0.5%X 0 Size 60mm 27mm Hybrid silicon pixels detector, changed every 100 run days 18k time-resolved pixels / station (300 300µm 2 ) ASIC thinned to 100µm operated in vacuum and cooled with micro-channels: world first HEP implementation! Mathieu Perrin-Terrin (CERN) The NA62 Experiment 19/56

The NA62 Experiment (25min) GTK - Time Measurement Principle Mathieu Perrin-Terrin (CERN) The NA62 Experiment 20/56

The NA62 Experiment (25min) GTK - Time Measurement Principle Simulation M. Fiorini Mathieu Perrin-Terrin (CERN) The NA62 Experiment 20/56

The NA62 Experiment (25min) GTK - Time Measurement Principle Mathieu Perrin-Terrin (CERN) The NA62 Experiment 20/56

The NA62 Experiment (25min) GTK - Time Measurement Principle At EoC, TDCs measure rising and falling edge time The full GTK integrates 21,600 TDCs in <25 cm 2! Use Time-over-Threshold to estimate time walk T 1 : GTK1 Pixel x 29,y 33 T 0 : GTK3 All Pixel 7.6<ToT<8.4 Time Walk (ns) -60-65 -70-75 -80 χ 2 / ndf 86.17 / 80 p0-71.37 ± 0.3229 p1-1.327 ± 0.1246 p2 0.1077 ± 0.0176 p3-0.005858 ± 0.001078 p4 0.0001353 ± 2.413e-05 160 140 120 100 80-85 Entries 46661 Mean x 10.26-90 Mean y -78.36 0 184 0 0 46084 0-95 0 391 2 0 5 10 15 20 25 30 35 ToT (ns) 60 40 20 0 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 21/56

The NA62 Experiment (25min) GTK - MicroChannels Cooling Etch channels in a 130µm thin Si plate glued on the ASICs Circulate cold C 6 F 14 in micro-channels (3.5 bars, 3 g/s) Fluid brought with capillaries soldered on cooling plates 70um 150um 200um Mathieu Perrin-Terrin (CERN) The NA62 Experiment 22/56

The NA62 Experiment (25min) GTK - MicroChannels Cooling I Etch channels in a 130µm thin Si plate glued on the ASICs I Circulate cold C6 F14 in micro-channels (3.5 bars, 3 g/s) I Fluid brought with capillaries soldered on cooling plates Mathieu Perrin-Terrin (CERN) The NA62 Experiment 22/56

The NA62 Experiment (25min) GTK - Status and Performance Three stations installed, (2 thinned at 100µm) 7-8 out of 10 chips per stations were working, fix next run Time resolution 260 ps per hit (at 160V instead of 300V) see First Data for kinematics performance counts / 97.65 ps 500 400 300 200 Entries 4953 Mean 78.37 Underflow 22 Overflow 15 2 χ / ndf 27.7 / 14 Mean 78.37 ± 0.01 Sigma 0.3652 ± 0.0056 100 0 74 76 78 80 82 84 86 t GTK3 - t GTK1 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 23/56

The NA62 Experiment (25min) Guard Ring - GTK3 Scattered Particle Detection KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto Collimator Guard Ring Beam GTK3 Leading Particle 1.8m Five first Guard Ring stations during installation Specifications Rate 10-100kHz Time Reso 1 ns Mathieu Perrin-Terrin (CERN) The NA62 Experiment 24/56

The NA62 Experiment (25min) CHANTI - Design and Performance 6 stations of scintillator+wls fibres read with SiPMs Signal processed with TDC count / 100ps σ t = 1.2 ns t channels Mathieu Perrin-Terrin (CERN) The NA62 Experiment 25/56

The NA62 Experiment (25min) CHOD - Charged Decay Product Timing KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Time Resolution, σ(t) 300 ps Muon Veto count / 100ps Preliminary 2014 2 layers (X-Y) of scintillator read each by 64 PMT Used for time reference t CHOD t KTAG Mathieu Perrin-Terrin (CERN) The NA62 Experiment 26/56

The NA62 Experiment (25min) Spectrometer - Decay Products Kinematics KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto x,y,u,v 10m 10m 15m Mathieu Perrin-Terrin (CERN) The NA62 Experiment 27/56

The NA62 Experiment (25min) Spectrometer - Design and Status Specifications Rate 15 MHz Momentum Reso 1% Angular Reso 20-60 µrad Material 4 0.5%X 0 Size 2.1 m diameter u,v x,y 2.1m 2.1m long straw filled wilt Ar+CO 2 at 1 atm ran in vacuum 7168 straws arranged in 4 chambers of 4 views (x,y,u,v) Readout up to 700kHz per straw with TDCs See performance in First Data Mathieu Perrin-Terrin (CERN) The NA62 Experiment 28/56

The NA62 Experiment (25min) ECAL - Photon Detection (K + π + π 0 ) KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto LAV Pb Glass - OPAL LKr NA48 IRC (+ SAC) Shashlik type 8.5 50 mrad 1 8.5 mrad < 1 mrad: angular coverage Mathieu Perrin-Terrin (CERN) The NA62 Experiment 29/56

The NA62 Experiment (25min) LAV: 8.5 50 mrad Specifications Eff. 99.8-99.99% Time Reso < 1 ns Tot Rate 1MHz 12 stations of 4-5 rings of staggered lead glass blocks Preliminary 2014 σ t < 1ns t Hit t KTAG Mathieu Perrin-Terrin (CERN) The NA62 Experiment 30/56

LKr: 1 8.5 mrad The NA62 Experiment (25min) Quasi homogenous liquid Kripton calorimeter from NA48 Inefficiency measured in 2004 at 10 5 for E > 10 GeV Major RO upgrade: full LKr sampled at 40MHz with 14bits FADC Mathieu Perrin-Terrin (CERN) The NA62 Experiment 31/56

The NA62 Experiment (25min) LKr - Performance Illumination 2014 - Preliminary 2014 Preliminary p K p π 0 2 K + π + π 0 event reconstructed with LKr only p K set to it nominal value π 0 reconstructed from two EM clusters, constrained to m π 0 Mathieu Perrin-Terrin (CERN) The NA62 Experiment 32/56

The NA62 Experiment (25min) RICH - π, µ Identification KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto Mathieu Perrin-Terrin (CERN) The NA62 Experiment 33/56

RICH - Design The NA62 Experiment (25min) π µ Angular Reso Time Reso Rate Specifications < 1% for p [15, 35] GeV < 100µrad < 100 ps RMS 10 MHz Neon at 1 atm: pth π = 13GeV /c 17m long vessel: 20 hits per ring Light reflected on two 1000 PM arrays read with TDC Mathieu Perrin-Terrin (CERN) The NA62 Experiment 34/56

The NA62 Experiment (25min) RICH - Performance Data 2014 - Preliminary Data 2015 - Preliminary σ t < 100 ps Ring Radius [mm] Data 2015 - Preliminary e µ π K t s1 t s2 π acceptance ɛ π = 83% ɛ µ = 2% mass [GeV/c 2 ] Multi-ring Rec Glob single mirr corr Single-ring Rec Indiv single mirr corr p rec [GeV /c] µ acceptance Mathieu Perrin-Terrin (CERN) The NA62 Experiment 35/56

The NA62 Experiment (25min) HCAL and MUV - π, µ Identification KTAG Giga BEAM > Tracker Guard Ring ECAL Large Angle Veto vacuum Spectrometer RICH RICH ECAL LKr-IRC-SAC C H O D HCAL 50m 100m 150m 200m 250m Muon Veto HCAL 1 and 2 MUV - back HCAL1 HCAL2 MUV Beam 2.6m Iron 80 cm Mathieu Perrin-Terrin (CERN) The NA62 Experiment 36/56

The NA62 Experiment (25min) MUV - Design and Performance MUV made of scintillator 22x22 cm 2 tiles read with 2 PMs and CFDs Specifications π µ < 10 2 Time Reso < 1ns RMS Rate 10 MHz 2014 - Preliminary 2014 Preliminary σ t = 420 ps t µ t KTAG Mathieu Perrin-Terrin (CERN) The NA62 Experiment 37/56

The NA62 Experiment (25min) HCAL 1 and 2 - Design and Performance HCAL1 (HCAL2) made of alternating layers of iron and 6 (12) cm scintillator strip read with PMs and TDCs Specifications π µ < 10 3 Time Reso < 1ns RMS Rate 10 MHz /E σ E HCAL1 2015 - Preliminary 0.55 χ 2 / ndf 26.23 / 15 0.5 p0-0.08267± 0.10542 0.45 p1 2.421± 0.949 0.4 p2-1.73± 2.08 0.35 0.3 0.25 0.2 0 10 20 30 40 50 60 70 Energy ( GeV ) HCAL2 2014 - Preliminary Energy [GeV] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 38/56

The NA62 Experiment (25min) Digital Trigger System System Feature As beam is not bunched triggers arrive asynchronously Digital inputs to L0TP 2015 Run System tested up to full intensity Digital calorimetric trigger implemented Mathieu Perrin-Terrin (CERN) The NA62 Experiment 39/56

Calorimetric Trigger The NA62 Experiment (25min) Full LKr sampled at 40 MHz with 14bits FADC Energies in one 25ns sampling of 16 (4x4) adjacent cells summed and pipe-lined in trigger boards With 5 consecutive 16-cell sum, trigger boards look for peaks in time and fit to get maximum (i.e. energy) Peak time extracted by constant fraction discrimination Energy filled in a 6.25ns lsb histo Mathieu Perrin-Terrin (CERN) The NA62 Experiment 40/56

The NA62 Experiment (25min) Calorimetric Trigger Status and Prospects 2015 Run Machinery operated synchronously on LKr and HCAL Trigger based on total energy in LKr and HCAL1: EHCAL1 tot tot > 6 GeV & ELKr < 4 GeV Prospects for Next Run LKr clustering in space (X and Y) at trigger level Trigger on individual LKr cluster instead of total energy Mathieu Perrin-Terrin (CERN) The NA62 Experiment 41/56

Outlook of the First Data (10min) Outline 1 Physics Case (10min) 2 The NA62 Experiment (25min) 3 Outlook of the First Data (10min) 4 Conclusions and Prospects Mathieu Perrin-Terrin (CERN) The NA62 Experiment 42/56

Outlook of the First Data (10min) A look at min-bias 2014 and 2015 data One track candidates: Good χ 2 and 4(3)-chambers (in 2014) K + kinematics: Beam mean values in 2014, GTK in 2015 Results preliminary: B field constant Drift-Time to Radius relation from MC (Garfield) Rough detector alignment Rough t0 (refined in 2015) Mathieu Perrin-Terrin (CERN) The NA62 Experiment 43/56

Outlook of the First Data (10min) Angle Track-Beam versus Track Momentum θ [rad] Preliminary Data 2014 θ [rad] Theoretical K + π 0 e + ν K + π + π 0 K + µ + ν Not K + K + π + π + π decay K + π 0 µ + ν K + π + π 0 K + µ + ν K + π + π 0 π 0 K + π + π + π p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 44/56

Outlook of the First Data (10min) Requesting in Time Kaon with KTAG K + in time with Track No K + in time with Track θ [rad] Preliminary Data 2014 θ [rad] Preliminary Data 2014 K + π + π 0 K + µ + ν Not K + K + π + π + π decay Not K + decay p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 45/56

Outlook of the First Data (10min) Checking Track Id using RICH K + in time with Track Matched Ring in RICH θ [rad] Preliminary Data 2014 K + π + π 0 K + µ + ν Not K + K + π + π + π decay Ring Radius [mm] µ + π + Preliminary Data 2014 K + p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 46/56

Outlook of the First Data (10min) Removing Scattered Beam Particle Component K + in time with Track not scattered θ [rad] Preliminary Data 2014 z [m] Preliminary Data 2014 K + π + π 0 K + µ + ν K + π + π + π Scattering in Collimator and GTK3 p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 47/56

Outlook of the First Data (10min) Squared Missing Mass K + in time with Track not scattered pk p 2 [GeV 2 /c 4 ] Preliminary Data 2014 K + π + π + π K + π + π 0 K + µ + ν 1 dγ Γ tot dm m 2 K + µν(γ) K + π + π 0 (γ) K + π + ν ν 10 10 K + πππ p [GeV/c] m 2 miss [GeV2 /c 4 ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 48/56

Outlook of the First Data (10min) Squared Missing Mass pk p 2 [GeV 2 /c 4 ] K + in time with Track not scattered Preliminary Data 2014 K + π + π + π K + π + π 0 K + µ + ν Reminder: No GTK p π < 35GeV/c Preliminary Data 2014 K + µ + ν K + π + π 0 K + π + π + π p [GeV/c] p K p 2 [GeV 2 /c 4 ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 48/56

Outlook of the First Data (10min) More Discriminating Power using RICH mass pk p 2 [GeV 2 /c 4 ] K + in time with Track not scattered Preliminary Data 2014 K + π + π + π K + π + π 0 K + µ + ν pk p 2 [GeV 2 /c 4 ] m µ m π Preliminary Data 2014 K + π + π + π K + π + π 0 K + µ + ν p [GeV/c] m RICH [GeV/c 2 ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 49/56

Outlook of the First Data (10min) Improving kinematics with GTK - 2015 K + in time with Track not scattered p K + from GTK pk p 2 [GeV 2 /c 4 ] Preliminary Data 2014 K + π + π + π K + π + π 0 K + µ + ν pk p 2 [GeV 2 /c 4 ] Preliminary Data 2015 K + π + π + π K + π + π 0 K + µ + ν p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 50/56

Outlook of the First Data (10min) Improving kinematics with GTK - 2015 Preliminary Data 2015 Without GTK Full p range Preliminary Data 2015 With GTK Full p range K + π + π 0 K + π + π 0 K + µ + ν K + π + π + π K + µ + ν K + π + π + π p K p 2 [GeV 2 /c 4 ] p K p 2 [GeV 2 /c 4 ] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 51/56

Outlook of the First Data (10min) Improving kinematics with GTK - 2015 Missing Mass Resolution σ( pk p 2 ) [GeV 2 /c 4 ] Preliminary Data 2015 pk p 2 [GeV 2 /c 4 ] Preliminary Data 2015 K + π + π + π K + π + π 0 K + µ + ν p [GeV/c] p [GeV/c] Mathieu Perrin-Terrin (CERN) The NA62 Experiment 52/56

Conclusions and Prospects Outline 1 Physics Case (10min) 2 The NA62 Experiment (25min) 3 Outlook of the First Data (10min) 4 Conclusions and Prospects Mathieu Perrin-Terrin (CERN) The NA62 Experiment 53/56

Conclusions and Prospects Conclusion and Prospects B(K + π + ν ν) an important observable in LHC era NA62 apparatus installed and first data taken New technologies developed (time resolved pixel, micro-channel cooling) now considered for LHC upgrades Data quality shows good performance Ready for 2-3 years of physics data taking Thanks you for your attention. Mathieu Perrin-Terrin (CERN) The NA62 Experiment 54/56

Conclusions and Prospects SPARES Mathieu Perrin-Terrin (CERN) The NA62 Experiment 55/56

Uncertainty budget Conclusions and Prospects 9.9 % 2.9 1.8 0.9 0.5 6.7 δp c,u long range contribution to charm P SD c short range contribution to charm Mathieu Perrin-Terrin (CERN) The NA62 Experiment 56/56