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Viacheslav Duk, INFN Perugia

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Presentation on theme: "Viacheslav Duk, INFN Perugia"— Presentation transcript:

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

2 outline NA62 experiment LFV in charged kaon decays K+→π-μ+μ+ decay
Exotic decays Dark photon search Heavy neutrino search Conclusions BEACH-2014, V.Duk, INFN Perugia 2 2

3 NA62 experiment NA62 main goal: measure K+→π+νν decay
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 BEACH-2014, V.Duk, INFN Perugia 3 3

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

5 NA48/2 and NA62 RK detector Main detectors: NA48/2
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% %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 % [GeV] NA48/2 NA62 RK BEACH-2014, V.Duk, INFN Perugia 5 5

6 NA62 experimental setup From SPS to NA62:
SPS primary beam: 400 GeV/c, ~5∙1012ppp Secondary hadron beam: 75 GeV/c, ~6% of K+ ~4.8∙1012 kaon 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 BEACH-2014, V.Duk, INFN Perugia 6 6

7 LFV in kaon decays NP probes up to mX ~ 100 TeV
assuming gX ~ gW , BR~10-12 BEACH-2014, V.Duk, INFN Perugia 7 7

8 K+→π-μ+μ+ decay Experiment status before NA48/2:
|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 BEACH-2014, V.Duk, INFN Perugia 8 8

9 K+→π-μ+μ+ at NA48/2 NA48/2, 2003-2004 data
52 candidates in the signal region Upper limit: BR(K+→π-μ+μ+) < 1.1 x (90% CL) PLB697 (2011) BEACH-2014, V.Duk, INFN Perugia 9 9

10 K+→π-μ+μ+ at NA62 Potential sensitivity up to ~10-12 NA62 MC NA48/2 MC
Increased kaon flux (x60) Increased p┴ kick (better invariant mass resolution) up to x1000 improvement in the statistics Potential sensitivity up to ~10-12 NA48/2 MC NA62 MC BEACH-2014, V.Duk, INFN Perugia 10 10

11 NA62 sensitivity to LFV decays
BEACH-2014, V.Duk, INFN Perugia 11 11

12 Exotic π0 decays NA62 single event sensitivity for π0 decays: 10-11 12
BEACH-2014, V.Duk, INFN Perugia 12 12

13 Dark photons 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: (with new BaBar data) BEACH-2014, V.Duk, INFN Perugia 13 13

14 Dark photons in π0→e+e-γ
NA48/2 ongoing analysis blue: signal MC for ε2=5x10-5 Dark photon search at NA62: ~108 π0→e+e-γ decays/year can be collected Mee resolution ~1 MeV Sensitivity: MU<100 MeV, ε2~10-6 NA62: UL will be improved BEACH-2014, V.Duk, INFN Perugia 14 14

15 Heavy neutrinos νMSM can explain: Matter/antimatter asymmetry
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 ~ MeV BEACH-2014, V.Duk, INFN Perugia 15 15

16 Heavy neutrino search at NA62
Plots from arXiv: NA62 MC 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 BEACH-2014, V.Duk, INFN Perugia 16 16

17 More exotics BEACH-2014, V.Duk, INFN Perugia 17 17

18 conclusions 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 BEACH-2014, V.Duk, INFN Perugia 18 18

19 THANK YOU! BEACH-2014, V.Duk, INFN Perugia 19 19

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