1 / 19

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

btommy
Download Presentation

LFV and exotics at NA62

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related