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LFV and exotics at NA62

LFV and exotics at NA62. LFV and exotics at NA62 experiment. Viacheslav Duk INFN Perugia. Viacheslav Duk , INFN Perugia BEACH-2014, 21-26.07.2014. 1. outline. NA62 experiment LFV in charged kaon decays K + → π - μ + μ + decay Exotic decays Dark photon search Heavy neutrino search

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LFV and exotics at NA62

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  1. V.Duk, INFN Perugia LFV and exotics at NA62 LFV and exotics at NA62 experiment ViacheslavDuk INFN Perugia ViacheslavDuk, INFN Perugia BEACH-2014, 21-26.07.2014 1

  2. outline V.Duk, INFN Perugia • NA62 experiment • LFV in charged kaon decays • K+→π-μ+μ+ decay • Exotic decays • Dark photon search • Heavy neutrino search • Conclusions 2

  3. NA62 experiment V.Duk, INFN Perugia Relevant for LFV and exotics search NA62 main goal: measure K+→π+νν decay (~100 events with S/B~10) NA62 collaboration: Birmingham, Bratislava, Bristol, Bucharest, CERN, JINR Dubna, Fairfax, Ferrara, Florence, Frascati, Glasgow, IHEP Protvino, INR Moscow, Liverpool, Louvain-la-Neuve, Mainz, Merced, Naples, Padua, Perugia, Pisa, Prague, Rome I, Rome II, San Luis Potosí, Sofia, Stanford, Turin 3

  4. NA48/2 and NA62 beamline V.Duk, INFN Perugia • Kaon beam momentum [GeV/c]: • NA48/2 (2003-2004): 60.0 ± 2.2 • NA62-RK (2007): 74.0 ± 1.4 • NA62 (2014): 75.0 ± 0.8 • NA48/2 data taking: • 4 months in 2003 (K±) • 4 months in 2004 (K±) • NA62-RK data taking: • 2007 (mostly K+) 4

  5. NA48/2 and NA62 RK detector V.Duk, INFN Perugia • Main detectors: • Magnetic spectrometer • Scintillator hodoscope • Liquid Krypton EM calorimeter (LKr) NA48/2 NA62 RK • Magnetic spectrometer: • 4 drift chambers (DCH) • 4 views per DCH • δp/p = 0.48% + 0.009%p [GeV/c] • Scintillator hodoscope: • Good time resolution (150ps) • Fast trigger • LKr: • High granularity (13248 cells, 2x2 cm2) • Quasi-homogenious, 7m3 liquid Kr (27X0) • σE/E = 3.2%/E1/2 + 9%/E + 0.42% [GeV] NA48/2 NA62 RK 5

  6. NA62 experimental setup V.Duk, INFN Perugia • From SPS to NA62: • SPS primary beam: 400 GeV/c, ~5∙1012ppp • Secondary hadron beam: 75 GeV/c, ~6% of K+ • ~4.8∙1012kaon decays per year • ~10% signal efficiency • ~50 signal events per year • NA62 setup: • Decays-in-flight technique • Detect K+ and π+ • NA62 basic principles: • High intensity + fast timing • Kinematic selection • Particle ID • Photon rejection See talk by F. Bucci for details 6

  7. LFV in kaon decays V.Duk, INFN Perugia NP probes up to mX ~ 100 TeV assuming gX ~ gW, BR~10-12 7

  8. K+→π-μ+μ+ decay V.Duk, INFN Perugia • |ΔL|=2 transition mediated by Majorana neutrino exchange • Neutrinoless double-beta decay in the 2nd generation • For some models predicted rates are close to experimental limits Experiment status before NA48/2: BNL E865, 5 events in the signal region Upper limit: BR(K+→π-μ+μ+) < 3.0 x 10-9 (90% CL) Phys. Rev. Lett. 85 (2000) 2877 8

  9. K+→π-μ+μ+ at NA48/2 V.Duk, INFN Perugia NA48/2, 2003-2004 data 52 candidates in the signal region Upper limit: BR(K+→π-μ+μ+) < 1.1 x 10-9(90% CL) PLB697 (2011) 107-115 9

  10. K+→π-μ+μ+ at NA62 V.Duk, INFN Perugia • NA62: • Increased kaon flux (x60) • Increased p┴ kick (better invariant mass resolution) • up to x1000 improvement in the statistics Potential sensitivity up to ~10-12 NA62MC NA48/2MC 10

  11. NA62 sensitivity to LFV decays V.Duk, INFN Perugia 11

  12. Exotic π0 decays V.Duk, INFN Perugia NA62 single event sensitivity for π0 decays: 10-11 12

  13. Dark photons V.Duk, INFN Perugia • Models with U boson (dark photon): • U is a new light vector gauge boson (from MeV to GeV) • U mediates interactions with DM (hidden sector) • Kinetic mixing between U and γ • Decays mainly to e+e- • Models with U boson (dark photon) can explain several anomalies: • PAMELA e+ excess • DAMA/Libra DM signals • (g-2)μ anomaly Plot from arXiv: 1406.2980 (with new BaBar data) 13

  14. Dark photons in π0→e+e-γ V.Duk, INFN Perugia NA48/2 ongoing analysis blue: signal MC for ε2=5x10-5 • Dark photon search at NA62: • ~108π0→e+e-γ decays/year can be collected • Mee resolution ~1 MeV • Sensitivity: MU<100 MeV, ε2~10-6 • NA62: UL will be improved 14

  15. Heavy neutrinos V.Duk, INFN Perugia • νMSM model: • 3 right-handed Majorana neutrinos added (N1, N2, N3) • N1 is the lightest (~keV) and can be a DM candidate • N2, N3: from 100 MeV to few GeV • Standard neutrino masses produced via seesaw mechanism (Yukawa coupling ~10-8) • νMSM can explain: • Matter/antimatter asymmetry • Neutrino mixing • Dark matter • N2/N3 search in charged kaon decays: • K+→μ+N, K+→e+N • Sensitivity up to ~300-400 MeV 15

  16. Heavy neutrino search at NA62 V.Duk, INFN Perugia Plots from arXiv: 1310.1762 NA62MC • Ongoing analysis: • NA62 RK data (2007) • Long-lived neutrino • K+→μ+N channel • Main variable: M2miss = (PK - Pμ)2 • NA62: higher statistics, better resolution, better photon veto 16

  17. More exotics V.Duk, INFN Perugia 17

  18. conclusions V.Duk, INFN Perugia • NA62 provides a wide spectrum of studies beyond the baseline: • LFV and LNV kaon decays • Exotic kaon decays • Exotic π0 decays • These decays allow to probe: • Neutrinoless double beta decay in the second generation • Dark photons • Heavy neutrinos • … • October 2014: NA62 starts the data taking 18

  19. V.Duk, INFN Perugia THANK YOU! 19

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