a search for sterile neutrinos at j-parc mlf (nuws at j ... · a search for sterile neutrinos at...

5
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 2.5° First ever measurements of σ Neutral Current (E ν ) Clear separaBon of single and mulBnucleon events 1

Upload: others

Post on 13-Jun-2020

15 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J-PARC @ 2015/08/05) JSNS2: J-PARC Sterile Neutrino Search using

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

2.5°

• First  ever  measurementsof  σNeutral  Current(Eν)

• Clear  separaBon  of  singleand  mulB-­‐nucleon  events

1

Page 2: A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J-PARC @ 2015/08/05) JSNS2: J-PARC Sterile Neutrino Search using

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

2.5°

• First  ever  measurementsof  σNeutral  Current(Eν)

• Clear  separaBon  of  singleand  mulB-­‐nucleon  events

Is  NuPRISM  neededfor  T2K*3?

(Discussion  was  largelydeferred  unBl  today)

1

Page 3: A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J-PARC @ 2015/08/05) JSNS2: J-PARC Sterile Neutrino Search using

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

2

LSND      region  brown  (90%CL)  &  green    (99%CL)

νe  Appearance νμ  Disappearance

JSNS2 NuPRISM KPipe

Fermilab  SBN

2

Page 4: A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J-PARC @ 2015/08/05) JSNS2: J-PARC Sterile Neutrino Search using

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

3

Emulsion  DetectorLAr  R&D

3

Page 5: A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J ... · A Search for Sterile Neutrinos at J-PARC MLF (NuWS at J-PARC @ 2015/08/05) JSNS2: J-PARC Sterile Neutrino Search using

“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

4