A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at...
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NuPRISM 10 m 14m 6 m 10m ν beam Spans many offaxis angles to measure many E ν spectra >4% bias in θ23 Improved θ23 Error <1% bias in θ23 sin 2 θMulti-N-sin 2 θNominal Sterile Neutrinos Unique σ ν Measurements Enhanced SensiBvity for T2K and T2HK Default T2K T2K + NuPRISM 4° 2.5° 1° • First ever measurements of σ Neutral Current (E ν ) • Clear separaBon of single and mulBnucleon events 1
Transcript of A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at...
NuPRISM
10 m 14m
6 m
10m
ν beam
Spans many off-‐axis angles tomeasure many Eν spectra
>4% biasin θ23
Improvedθ23 Error
<1% biasin θ23
sin2θMulti-N-sin2θNominal
Sterile Neutrinos
Unique σν Measurements
Enhanced SensiBvity for T2K and T2HK
DefaultT2K
T2K +NuPRISM
4°
2.5°
1°
• First ever measurementsof σNeutral Current(Eν)
• Clear separaBon of singleand mulB-‐nucleon events
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NuPRISM
10 m 14m
6 m
10m
ν beam
Spans many off-‐axis angles tomeasure many Eν spectra
>4% biasin θ23
Improvedθ23 Error
<1% biasin θ23
sin2θMulti-N-sin2θNominal
Sterile Neutrinos
Unique σν Measurements
Enhanced SensiBvity for T2K and T2HK
DefaultT2K
T2K +NuPRISM
4°
2.5°
1°
• First ever measurementsof σNeutral Current(Eν)
• Clear separaBon of singleand mulB-‐nucleon events
Is NuPRISM neededfor T2K*3?
(Discussion was largelydeferred unBl today)
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Sterile ν Proposals at J-‐PARC
• JSNS2: a precise test of LSND anomaly with “no excuses”– Granted stage 1 approval by J-‐PARC/KEK
– No need for civil construcBon: very cost effecBve and can be Bmely
• NuPRISM’s (very) conservaBve sensiBvity is staBsBcs limited, and strong in-‐situ background constraints are not yet incorporated into the analysis– Unique probe since signal and background vary differently with off-‐axis angle
• KPipe can observe the full oscillaBon pa^ern within a 120 m long detector– Very disBnct signal to definiBvely confirm or refute sterile-‐ν oscillaBon
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LSND region brown (90%CL) & green (99%CL)
νe Appearance νμ Disappearance
JSNS2 NuPRISM KPipe
Fermilab SBN
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New Detector Technologies
• Emulsion detector provides detailed ν final state informaBon– There is interest in an Emulsion + INGRID measurement
• LAr R&D: Important to conBnue fundamental detector research in Japan– ConBnue collaboraBon toward internaBonal, large scale LArTPC
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Emulsion DetectorLAr R&D
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“Other” ν at J-‐PARC Discussion
• In which ways are these experiments both complement, and compete against, other experiments– At J-‐PARC– Worldwide
• Will the Bmescales for each experiment allow for a sufficiently Bmely measurement?
• What resources are required in terms of manpower, money, and faciliBes to execute these experiments?
• Comments on programmaBc prioriBes for J-‐PARC?– How might these proposals fit in?
• Kpipe– ν
μ disappearance complementarity to
other sterile searches important?
• NuPRISM
• What is the feasibility of T2K reaching 3% systemaBcs?
• Is NuPRISM needed for T2K*3?
• Do the sterile-‐ν and nuclear physics make the project more worthwhile?
• T60 (Emulsion)• Can T60 help ν–nucleus understanding?
(high granularity, number of protons, low E thresh, magneBzed ν/anB-‐ν separaBon)
• Comments on an Emulsion+INGRID measurement?
• LAr R&D• Importance of conBnuing fundamental
detector R&D in KEK/Japan? (conBnue collaboraBon toward internaBonal, large scale LArTPC
• JSNS2 / J-‐PARC E56• Complementarity with Fermilab SBN?
General Topics Experiment Specific
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