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SBNW11 Summary June 23, 2011. Louis – Experimental Results & Theoretical Interpretations Van de Water – Future Facilities & Experiments. 109 Registrants 44 Institutions Talks are on Web Page https://indico.fnal.gov/event/sbnw2011. What is Short Baseline?.

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sbnw11 summary june 23 2011

SBNW11 SummaryJune 23, 2011

Louis – Experimental Results & Theoretical

Interpretations

Van de Water – Future Facilities & Experiments

slide2

109 Registrants

44 Institutions

Talks are on Web

Page

https://indico.fnal.gov/event/sbnw2011

what is short baseline

What is Short Baseline?

“Short” refers to Ln/En and not just Ln

Note that Ln/En is proportional to the n lifetime in its CM frame

Our definition of “Short” is Ln/En ~ 1 (km/GeV or m/MeV)

This definition includes radioactive n source experiments (~1 m/1 MeV), reactor n experiments (~5 m/5 MeV), accelerator n experiments (~1 km/1 GeV), & IceCube atmospheric n (~1000 km/1 TeV)

motivation for sbnw11

Motivation for SBNW11

Tantalizing results from short (& long) baseline experiments (LSND, MiniBooNE, MINOS, Reactor Antineutrinos, Radioactive Neutrino Sources, etc.) may possibly have a profound impact on our understanding of particle & nuclear physics.

Neutrino cross sections are very interesting: nuclear effects, short-range correlations, pion exchange currents, pion absorption, initial state interactions, & final state interactions make this a rich and compelling area of study. Nuclear effects can affect neutrinos and antineutrinos differently and affect CP violation interpretations.

miniboone n eutrino results mills
MiniBooNENeutrino Results – (Mills)
  • A. Aguilar-Arevalo et al., Phys.
  • Rev. Lett. 102, 101802 (2009)
lsnd miniboone antineutrino results
LSND & MiniBooNE Antineutrino Results
  • A. Aguilar-Arevalo et al., Phys.
  • Rev. Lett. 105, 181801 (2010)
slide7

nmCCQE Scattering - (Carlson)

A.A. Aguilar-Arevalo, Phys. Rev. D81, 092005 (2010).

Extremely surprising result - CCQE C)>6 n)

How can this be? Not seen before, requires correlations. Fermi Gas has no correlations and should be an overestimate.

A possible explanation involves short-range correlations & 2-body pion-exchange currents: Joe Carlson et al., Phys.Rev.C65, 024002 (2002) & Gerry Garvey. These nuclear effects could have a big effect on searches for CP Violation.

initial minos n m disappearance results in n mode thomas
Initial MINOS nm Disappearance Results innMode(Thomas)

“The probability that the underlying nm and nm parameters are identical is 2.0%.” (arXiv:1104.0344)

Expect nm disappearance above

10 GeV for LSND neutrino oscillations.

initial minos n m disappearance results in n mode
Initial MINOS nm Disappearance Results in nMode

Expect nm disappearance above

10 GeV for LSND neutrino oscillations.

reactor antineutrino anomaly mention
Reactor Antineutrino Anomaly(Mention)

arXiv: 1101.2755

R=0.937+-0.027

radioactive neutrino sources gavrin
Radioactive Neutrino Sources(Gavrin)

R=0.86+-0.05

SAGE, PRC 73 (2006) 045805

arXiv:nucl-ex/0512041

Giunti & Laveder, arXiv:1006.3244

theoretical interpretations

Theoretical Interpretations

Sterile neutrinos (3+N models with CP violation) - Ignarra

Non-standard interactions – Kopp & Friedland

Lorentz violation - Diaz

CPT violation

Sterile n decay - Gninenko

global fits to world n data ignarra lsnd karmen miniboone reactor minos cdhs etc
Global Fits to World n Data(Ignarra)(LSND, KARMEN, MiniBooNE, Reactor, MINOS, CDHS, etc.)

all n & n

n only

3+1

Christina Ignarra; Updated from G. Karagiorgi et al., PRD80, 07300 (2009)

Kopp, Maltoni, & Schwetz,

arXiv:1103.4570

Key test is a search for nm disappearance!

sterile n decay gninenko
SterilenDecay?(Gninenko)
  • The decay of a ~50 MeV sterile nhas been shown to accommodate the LSND & MiniBooNE excesses
    • Gninenko, PRL 103, 241802 (2009)
          • arXiv:1009.5536
slide16

Lorentz Violation?

(Diaz)

arxiv: 1012.5985

slide21

Conclusions

  • World antineutrino data agree very well with a 3+1 model
  • Key test of 3+1 is a search for nm disappearance
  • World neutrino + antineutrino data can be explained somewhat well by a 3+2 model with CP violation, although there is tension between appearance and disappearance experiments
  • Other models are possible besides 3+N: NSI, sterile neutrino decay, Lorentz violation, CPT violation, etc.
  • Knowledge of cross sections important for interpretations of short and long baseline oscillations
workshop summary of future experiments and facilities
WorkShop Summary of Future Experiments and Facilities:
  • Key questions
  • Requirements for future beam experiments
  • Future experiments/facilities
    • Short term
    • Mid term
    • Long term
  • Summary
some key questions
Some Key Questions:
  • Need to make smoking gun measurement.
    • How do we do it quickly?
    • vμ disappearance??
  • Need to make a >5 sigma measurement at L/E ~1 to convince ourselves and the community of new physics.
  • Not sure of underlying physics, so need an experiment (or set of experiments) with diverse capabilities that can test many ideas.
  • Cross section effects are important, and can change interpretation of oscillation results.
requirements for next beamline experiments
Requirements for next beamline experiments:

Need to measure neutrino properties to the few percent level.

Rate = Flux x Cross Section x detector response

Flux: Intense source -> Booster/MI, CERN-PS, SNS, cyclotrons, LBNE, Project X. Measure flux insitu using H/D2 targets.

Cross Section: Need better models, especially to measure correct neutrino energy. Much data on Carbon, need more data for Ar.

Detector Response: LAr would allow separation of electrons and gamma-rays. Want good tracking and magnetic fields. Two detectors or long detector to measure L/E effects.

near term goals few years search for smoking gun
Near Term Goals (~few years)Search for smoking gun:
  • Keep running Miniboone to improve antineutrino oscillation statistics (collect ~1.5E21 POT).
  • Complete SB/MB vμ disappearance.
  • Oscillation updates from Minos (vμ disappearance, antinu NC, LV).
  • Analyze IceCube data, look for vμ disappearance.
  • Make more cross section measurements with Minerva, Minos, Miniboone, ArgoNeut.
  • Develop better cross section models.

->Apply to recent oscillation results, i.e. shift in reconstructed neutrino energy. Could it explain the difference in Minibooneve and ve appearance result?

icecube l e 10tev 10 000km 1
IceCube (L/E ~10TeV/10,000km ~1)

(Warren Huelsnitz)

- They are working on full systematicsand willhave results in the future.

slide27
Mid Term Possibilities (3-7 years)Make Detailed measurements to begin understanding the underlying physics:
  • Run uBooNE to test MB low energy anomaly.
  • Build BooNE (near detector) – decisive (~5 sigma), quick, inexpensive, on Carbon (measure disappearance/appearance).
  • Minos+ running to search for sterile nu, NSI, etc.
  • NOvA 2nd near detector (L/E ~1) and SciNova cross sections.
  • Build and run two detector LAr experiments at CERN and FNAL to make definitive test of appearance, disappearance, nu decay, etc.
  • Build OscSNS/cyclotron experiment (stop pion source) to retest LSND directly >5 sigma.
  • Katrin results (look for kinks in E distribution above end point).
  • Develop Muon Storage ring, Reactor (SCRAAM) and Source (LENS, Ga, Borexino) experiments.
slide28
MicroBooNE'sLArTPC detection technique extremely powerfulSensitivities in neutrino mode (R. Guenette)
  • e/γ separation capability removes νμinduced single γ backgrounds
  • electron neutrino efficiency: ~x2 better than MiniBooNE
  • sensitivity at low energies (down to tens of MeV compared to 200 MeV on MiniBooNE)

As a counting experiment: translates to 5σ sensitivity if excess is νe, 4σ if excess is γ

Low energy excess above background if excess is electrons

Low energy excess above background if excess is photons

boone mb like near detector at 200m 1e20 pot each mode only 1 year running full systematics mills
BooNE: MB like near detector at 200m, 1E20 POT each mode (only 1 year running) – Full systematics (Mills)

Neutrino mode appearance

Antineutrino mode appearance

- Also >5σ disappearance sensitivity inboth modes.

minos and nova j thomas r patterson j cooper
Minos+ and NoVA(J. Thomas, R. Patterson, J. Cooper)

NoVA with a second near detector

MINOS+ disappearance

  • NoVA has also considered a off axis
  • near detector.
  • Given the similar energies and signal,
  • NoVA is taking seriously SB
  • oscillations/physics as a source of
  • background they need to understand.
uboone and lalar on the bnb roxanne guenette
uBoonE and LaLAr on the BNB (Roxanne Guenette)

(Stat errors only)

(Stat errors only)

Assumes 2-3E20 POT/yr

> Project X feeding the BNB could significantly (~ x10) reduce the required run time!

slide32
Moving ICARUS (600T LAr) to CERN, build a near detector (150T LAr) and rebuild the PS neutrino source (F. Pietropaola).
  • CERN Science council is seriously considering the proposal and will make a
  • recommendation soon (June 28) whether to proceed with real design and costing work.
slide33

OscSNS at ORNL: A Smoking Gun Measurement

of Active-Sterile Neutrino Oscillations

MB like detector at the SNS

1kton LS

detector

At 60m

SNS: ~1 GeV, ~1.4 MW

  • nm -> ne ; nep -> e+n => re-measure LSND an order of magnitude better.
  • nm -> ns ; Monoenergeticnm; nm C -> nm C*(15.11) => search for sterile ν

OscSNS would be capable of making precision measurements

of ne appearance & nm disappearance and proving, for example, the

existence of sterile neutrinos! (see Phys. Rev. D72, 092001 (2005)).

Flux shapes and cross sections are known very well.

long term possibilities 8 years make precision measurements of new physics
Long Term Possibilities (>8 years)Make Precision measurements of new physics:
  • If smoking gun found, then design/build a series of experiments with Project X to explore in detail the source of new physics:
    • DIF (300-600kW at 3GeV with a new accumulator)
      • 15-30 times more flux with reduced Kaon background.
    • DIF (25-50kW at 8GeV with antiproton accumulator) directly into BNB.
    • DAR difficult due to long duty cycle.
    • Beam dump exotics - axions, paraphotons, etc.
    • Cross sections.
sbnw11 workshop summary
SBNW11 Workshop Summary:
  • The conference succeeded in starting to build a community to investigate physics at the L/E ~1 scale.
  • We need to find a smoking gun soon:
    • More MB running, SB/MB disappearance, BooNE, uBooNE, IceCube.
  • LAr will play a crucial role in the future, and can test in detail many of the models such as 3+N, nu decay, nuclear effects, LV, etc.
  • We need to continue work on cross sections for Carbon and Ar.
    • Nuclear effects are important, especially to energy determination, which can affect oscillation parameters.
  • Whatever technology/experiments we do, we needoverwhelmingstatistics (protons)to understand details of the new physics.
    • Project X would be an outstanding opportunity for short baseline physics.
global fits to world n data
Global Fits to World n Data

all n & n

3+1

Updated from G. Karagiorgi et al., PRD80, 07300 (2009)

Kopp, Maltoni, & Schwetz,

arXiv:1103.4570

miniboone v e appearance oscillations

Future Projections

Current: 5.66E20 POT: E > 475 MeV

MiniBooNEveAppearance Oscillations

8.58E20 POT

  • We have reprocessed up to 8.58E20 POT and are currently analyzing the data. We will
  • release updated oscillation results soon (this summer)
  • - 50% more POT and new K+ constraint from SciBooNE.
  • Joint SciBooNE/MiniBooNEvμ disappearance analysis ongoing with results in the fall.