New Limits on Heavy Neutrino from NA62

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1 New Limits on Heavy Neutrino from NA62 Michal Koval (CERN) on behalf of the NA62 collaboration EPS HEP 2017 Venice, Italy, 5 12 July 2017

2 Kaon Decay Experiments at CERN Earlier: NA : ε /ε: K L +K S 1998: K L +K S Switzerland Jura mountains SPS NA48/NA62: centre of the LHC LHC France NA48 discovery of direct CPV NA48/1 1999: K L +K S K S HI 2000: K L only K S HI 2001: K L +K S K S HI 2002: K S /hyperons 2003: K + /K NA48/2 2004: K + /K Geneva airport N NA62 R K phase 2007: K ± e2/k ± µ2 2008: K ± e2/k ± µ2 2014: pilot run tests tests This talk Kaon decay in flight experiments. NA62: 200 participants, 30 institutes NA : commissioning run 2016 : K + π + νν run EPS HEP 2017, 1

3 Heavy Neutrino: Motivation Observation of neutrino oscillations massive neutrinos need to be accommodated in SM Example of a SM extension: Neutrino Minimal SM (νmsm) [Asaka et al., PLB 620 (2005) 17] 3 right-handed neutrinos added to SM, masses:, : dark matter candidate : extra CPV-phases to account for Baryon Asymmetry, produce SM masses via see-saw mech EPS HEP 2017, 2

4 Heavy Neutrino: Motivation Observation of neutrino oscillations massive neutrinos need to be accommodated in SM Example of a SM extension: Neutrino Minimal SM (νmsm) [Asaka et al., PLB 620 (2005) 17] 3 right-handed neutrinos added to SM, masses:, : dark matter candidate : extra CPV-phases to account for Baryon Asymmetry, produce SM masses via see-saw mech. If, heavy neutrinos observable via production in: R. Shrock PLB96 (1980) 159 This talk: search for peaks in NA data sample: NA data sample: Other searches look for decays of heavy neutrinos (HN), e.g. Kinematic enhancement factor EPS HEP 2017, 3

5 NA62 Experiment in 2007 Main measurement: Phys. Lett. B 719 (2013) 326 Beam momentum: (74 ± 2) GeV/c Triggers: 1-track, 1-track (scaled down) Subdetectors: Magnetic spectrometer (4 DCHs) Scintillator hodoscope (HOD) Liquid Krypton EM calorimeter (LKr) Muon veto system (MUV) EPS HEP 2017, 4

6 Data Sample in 2007 Kaon decays in fiducial volume: Heavy neutrino (HN) MC simulation Acceptance vs. HN mass: Missing mass resolution vs. HN mass: Missing mass: Signal region: EPS HEP 2017, 5

7 Heavy Neutrino Search in 2007 Data Rolke-Lopez method used to find upper limits on number of signal events Heavy neutrino mass step: Search window size defined by HN mass resolution No HN signal observed with >3σ significance EPS HEP 2017, 6

8 NA62 Experiment in 2015 Main goal, 10% precision measurement of: NA62 collaboration, JINST 12 (2017) P05025 Beam momentum: 75 GeV/c (±1%) Subdetectors: Tracking: kaon (GTK), π/μ/e (Straw) Hermetic veto detectors: Photons (LAV, LKr, SAC, IRC) Muons (MUV) Particle identification Kaon in the beam (KTAG) π/μ/e (RICH, LKr, MUV) Data taking conditions in 2015: Minimum bias at 1% of design beam intensity Beam tracker not available; kaon momentum estimated as beam average EPS HEP 2017, 7

9 Data Sample in 2015 Kaon decays in fiducial volume: Heavy neutrino (HN) MC simulation Acceptance vs. HN mass: Missing mass resolution vs. HN mass: Squared missing mass: Signal region: EPS HEP 2017, 8

10 Heavy Neutrino Search in 2015 Data Rolke-Lopez method used to find upper limits on number of signal events Heavy neutrino mass step: Search window size for each mass hypothesis: Expected background Observed events No HN signal observed with >3σ significance EPS HEP 2017, 9

11 Upper Limits on U l4 2 Limits from heavy neutrino production searches NA data analysis: Extends the mass range for upper limits on Most stringent limit in NEW NEW NA data analysis: Reaches on limits in the range EPS HEP 2017, 10

12 Summary and Outlook NA62 searches for heavy neutrino production in charged kaon decays were presented No heavy neutrino signal observed Analysis of NA data (arxiv: ): About 60 million K + decays in the fiducial volume Improves limits on for Limits from heavy neutrino production searches Analysis of NA data: About 300 million K + decays in the fiducial volume New limits on reaching for Future prospects: Major analysis improvements with NA high intensity data set, e.g. fully working beam tracker EPS HEP 2017, 11

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