recentresultsand prospectsmoriond.in2p3.fr/.../2_blondel-t2k-moriond-ew-2019.pdf · 7 alain blondel...
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Recent Results and Prospects
Alain Blondel
KoichiroNishikawa
(1949-2018)
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2Alain Blondel T2K latest results and prospects
Idea of T2K was born 1999-2001 hep-ex/0106019 combining:-- existing SuperKamiokande detector (50kton W.Č., 22.5 kton fiducial)
excellent mu/e separation esp. in the sub-GeV region.
-- JAERI-KEK Japanese Proton Accelerator Research Complex (JPARC)at TOKAI including a high power, 0.75MW/30GeV Proton Synchrotronneutrino beam from pion decay π+ →µ+ νµ
-- baseline 295 km � neutrino energy for first maximum is ~650 MeVachievable by pion-decay beam at 2.5 degrees off-axis
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-- designed for νµ→νe appearance search
(discovered in 2011-13);
now main aim is CPV
-- Off axis beam � narrow spectrum
peak energy given by off axis angle
-- Hadron production spectrum
measured at CERN (SHINE/NA61)
-- thin target (used, 10% on flux)
-- replica target (will be used, 5%)
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Knowledge of off-axis angle provides beam energy scale with % level precision
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5Alain Blondel T2K latest results and prospects
The Off-Axis Near Detector monitors
event rates (vs flavour, kinematics, topology)
-+- *not* functionally identical to FD
-+- but covers full muon momentum
-+- and extracts details of interactions
--- mostly forward muons
Fine grain detector of light material
-- one FGD has 50%water layers
-- Scintillators with MPPC readout
(60’000 channels!)
-- TPC tracker in 0.2T magnetic field
UA1/NOMAD magnet donated by CERN
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6Alain Blondel T2K latest results and prospects
A few ND280 neutrino interaction candidates
νµ
quasi-elastic candidate
single pion candidate DIS candidate
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7Alain Blondel T2K latest results and prospects
1) Search for heavy neutrinos with the T2K near detector ND280 arXiv:1902.07598 [hep-ex].
2) Search for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295 km arXiv:1902.06529 [hep-ex].
3) Search for neutral-current induced single photon production at the ND280 near detector in T2KarXiv:1902.03848 [hep-ex].
4) T2K ND280 Upgrade - Technical Design Report arXiv:1901.03750 [physics.ins-det].
5) Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with $2.2\times10^{21}$ Protons on Target arXiv:1807.07891 10.1103/PhysRevLett.121.171802. Phys.Rev.Lett. 121 (2018) no.17, 171802.
6) Characterization of nuclear effects in muon-neutrino scattering on hydrocarbon with a measurement of final-state kinematics and correlations in charged-current pionless interactions at T2KarXiv:1802.05078 [hep-ex]. 10.1103/PhysRevD.98.032003. Phys.Rev. D98 (2018) no.3, 032003.
7) Measurement of inclusive double-differential νµ charged-current cross section with improved acceptance in the T2K off-axis near detectorarXiv:1801.05148 [hep-ex]. 10.1103/PhysRevD.98.012004. Phys.Rev. D98 (2018) 012004.
8) First measurement of the νµ charged-current cross section on a water target without pions in the final statearXiv:1708.06771 [hep-ex]. 10.1103/PhysRevD.97.012001. Phys.Rev. D97 (2018) no.1, 012001.
10) Measurement of νµ andνµ charged current inclusive cross sections and their ratio with the T2K off-axis near detector arXiv:1706.04257 10.1103/PhysRevD.96.052001. Phys.Rev. D96 (2017) no.5, 052001.
11) Measurement of the single π0 production rate in neutral current neutrino interactions on waterarXiv:1704.07467 [hep-ex]. 10.1103/PhysRevD.97.032002. Phys.Rev. D97 (2018) no.3, 032002.
Recent T2K publications
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8Alain Blondel T2K results and prospects
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neutrino oscillations in T2K:
beam energy peaks at oscillation max.
magnitude of peak �sinδ, sin2 2θ13 x sin2θ23, MH
position of peak �cosδ , MH ν vsν � CP
Energy position of dip � ∆m223
depth of dip � sin2 2θ23
ν vsν � CPT
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10Alain Blondel T2K latest results and prospects
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sin δ term is CP violatingcos δ term is not.
sensitivity to δ (precision on δ measurement) is driven by sin δ term if δ is close to 0 or π � rate asymmetry νe vsνecos δ term if δ is close to ±π/2 � E shift, common to νe andνe
different systematics!
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Beam delivery has been steadily improving to 500kW beam power.
Run started in 2009, interrupted by Giant Earthquake (2011) and rad incident (2013)
Recent run mostly in anti-neutrino (50% more statistics wrt neutrino 2018 results)
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Collider-style plot
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Latest T2K far detector data set
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14Alain Blondel T2K latest results and prospects
Neutrino interaction model
Model of single muon events (CC0π) are constrained to data. This is very effective for νµ .
Additional errors remain for νe -- interplay of lepton mass, thresholds and nuclear effects
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T2K flux + near detector event rates are used to predict the event rates at far detector
for any set of oscillation parameters within syst. errors
FHC (Forward Horn Current) � (h+ focus) � neutrino beam
RHC (Reverse Horn Current) � (h- focus) � anti-neutrino beam
1-ring = quasi-elastic interaction
1-ring + 1 decay electron = CC1π candidate)
Binding energy effect is constrained by νµ events at ND280, but not for νe
( binding energy)
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(due to a deficit of obsered νµ)
Full 3-family analysis
on all channels
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FUTURE PROSPECTS … LOTS!
T2K + Wagasci-Baby-MIND full detector to run in spring 2019
SK was open in 2018 starts again in March 2019
filling with Gd for improved ν vsν rejection (atmo, beam) 2020
ND280 upgrade construction (approved as CERN NP07)*) 2019-2021
JPARC power converter upgrade (double. rep rate) 2021
restart with high power (>750 kW) 2022
RF power upgrade power� 1.3 MW 2023-25
Also requires upgrades in neutrino beam infrastructure
aim at > 3 σ (expected, δ=-π/2) by start of HyperK
HyperK! seed-funded in 2019 pledged start of construction in 2020
Full data taking starts in ~2027
Also proposed:
New Intermediate Water Cherenkov detector
Second far detector in Korea
*) CERN will become member of T2K
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Accelerator-based neutrino program
in Japan: K2K � T2K � HyperK
Hyper-Kamiokande (260kt)
Super-Kamiokande(50kt)
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Near detector upgrade
motivations:
1. θ13 is large! � syst. dominate
2. Lots learned from running!
-- missing: good coverage of
large angle leptons
-- also e/γ separation and
PID within target
� replace upstream part of detector include large angle TPCs surrounding a 3D readout
fine grain scintillator detector SFGD (keep FGDs and forward TPCs)
� allows full scattering angle coverage with magnetic tracking
� SFGD target performance should allow e/γ separation
+ investigation of low momentum protons and neutrons
beautiful test beam in 2018�
Submitted to JPARC PAC and CERN SPSC
� approved (NP07 at CERN)
installation to start in 2021
to take data with upgraded beam in 2022. Alain Blondel T2K latest results and
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Comments: -- if 3.4σ NH evidence persists, T2K-II + NOvA will not be far from 5σ by 2026.
-- HK saturation at 8σ driven by assumptions on systematic errors.� strong effort and support to reduce these
-- ND280 upgrade, -- Further NA61 measurements-- New IWC near detector (E61)
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E61
1. By combination of fluxes taken at different angles,
generate a quasi-monochromatic beam
2. by the same combination of data generate the
Energy Response Function
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SPARES
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1.49 1021 POT ν + 1.63 1021 POTν
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A. Kabothnuphys18
Baysesian analysis (Markov Chain)
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