Neutrino Oscillation Physics with a Neutrino Factory

EPS-HEP Conference, Grenobleon behalf of IDS-NF Collaboration

Paul Soler, 21 July 2011

EPS-HEP, Grenoble: 21st July 2011 2

International Design Study International Design Study International Design Study for a Neutrino Factory (IDS-NF)

― Principal objective: deliver Reference Design Report by 2013 Physics performance of the Neutrino Factory Specification of each of the accelerator, diagnostic, and detector

systems that make up the facility Schedule and cost of the Neutrino Factory accelerator, diagnostics,

and detector systems.

― Co-sponsored by EU through EUROnu― Web site: https://www.ids-nf.org/wiki/FrontPage

Interim Design Report: IDS-NF-020 delivered in 2011 ̶� IDR was used to measure progress in planning for these facilities

and detailed performance parameters at half way point of study̶� Reviewed by International Panel organised by ECFA, chaired by

Prof Francis Halzen (Wisconsin), at Daresbury Lab on 5-6 May 2011

Report this afternoon at joint ECFA-EPS session

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Neutrino Factory BaselineNeutrino Factory Baseline

Two Magnetised Iron

Neutrino Detectors (MIND): – 100 kton at 2500-5000 km

– 50 kton at 7000-8000 km

Baseline constantly under review in light of new physics results

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Physics Case for a Neutrino FactoryPhysics Case for a Neutrino Factory

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Minakata &

Nunokaw

a JHE

P 2001

Neutrino Oscillations in MatterNeutrino Oscillations in Matter

E

mijij 2

2 eFnGA 2

Matter oscillation results for three neutrinos:

xB

xA

BAxJP

xB

xA

BAxJP

xA

AcP

xB

BsP

PPPPxPee

2sin

2sin

2sinsin

~

2sin

2sin

2coscos

~

2sin2sin

2sin2sin

)(

1312134

1312133

22

1212

22232

2

2

1313

22231

4321)(

AAB 131322

132

1313 2sin2coswith

where is for , 13231213 2sin2sin2sin~ cJ

(MSW effect)

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Neutrino Oscillations in MatterNeutrino Oscillations in Matter

E

mijij 2

2 eFnGA 2

Matter oscillation results for three neutrinos:

xB

xA

BAxJP

xB

xA

BAxJP

xA

AcP

xB

BsP

PPPPxPee

2sin

2sin

2sinsin

~

2sin

2sin

2coscos

~

2sin2sin

2sin2sin

)(

1312134

1312133

22

1212

22232

2

2

1313

22231

4321)(

where is for , 13231213 2sin2sin2sin~ cJ

(MSW effect) Only one term

in equation

Magic baseline:

km760073002

xAx

Clean determination of 13

AAB 131322

132

1313 2sin2coswith

Magic baseline only depends

on value of density of Earth

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Neutrino Oscillation fitsNeutrino Oscillation fits Global fit provides:

sin212=0.312+0.017-0.015

m212 =7.59+0.20

-0.18×10-5 eV2

sin223=0.510.06

m312=2.450.09×10-3 eV2

InvertedNormal

Schwetz, Tortola, Valle

Hints for non-zero 13: NH(IH)

T2K: 0.03(0.04)<sin213<0.28(0.34) (2.5)

MINOS: 0<sin213<0.12(0.19) (1.7)

Reactors: sin213=0.023+0.016-0.013 (2.3

Combined: sin213=0.021(0.025)±0.007Fogli et al.

Yet to be defined in detail: Confirm 13 value

Is 23=/4,</4 or >/4?

Mass hierarchy: sign m312

CP violation phase

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Neutrino Factory Accelerator and Neutrino Factory Accelerator and DetectorsDetectors

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e

e

e

e

Neutrino Factory BaselineNeutrino Factory Baseline Proton driver

– Proton beam ~8 GeV on target Target, capture and decay

– Create , decay into (MERIT) Bunching and phase rotation

– Reduce E of bunch Cooling

– Reduce transverse emittance (MICE)

Acceleration– 120 MeV 25 GeV with RLAs

and FFAG Decay rings

– Store for ~1000 turns– Long straight sections

e

e

e

e

Neutrino spectra calculable to high accuracySee poster on Neutrino Factory

accelerator facility

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Golden channel signature: appearance of “wrong-sign” muons in magnetised iron calorimeter

Two far detectors:― 2500-5000 km baseline: 100 kton― 7000-8000 km (magic) baseline: 50 kton

Appearance of “wrong-sign” muons Segmentation:

― 3 cm Fe + 2 cm scintillator

Magnetic Iron Neutrino Detector (MIND)

e

e

50%

50%

wrongwrongsignsignmuonmuon

e

detectordetector

IDS-NF simulations for 25 GeV NuFact:

Baseline for a Neutrino Factory: Baseline for a Neutrino Factory: MINDMIND

50-100 m long

See poster on Neutrino Factorydetectors

14mx14mx3cm platesToroidal magnetic field:

1.0-2.2 T

Engineering well advanced

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MIND analysisMIND analysis

incorrectpq

correctpq

/

/logl

lLq/p

NC

CC

1

1logll

L1

0.5- likelihood log /

/ pqpq

Curvature error (CC rejection) and NC rejection-CC

-CC-CC

-CC

Num hits > 150

hadt PQ 2sin Kinematic cuts: Neutrino energy (E=E+Ehad) vs

CC signal

NC

CC

1

1logll

L10.5- likelihood log /

/ pqpq

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MIND: CC and NC backgroundMIND: CC and NC background Analysis with Nuance and GEANT4:

anti-numu as numu numu as anti-numu

NC as numu NC as anti-numu

CC background

NC background

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MIND: MIND: ee background and signal background and signal Analysis with Nuance and GEANT4:

nue background

Signal efficiencies

nue as numu anti-nue as anti-numu

numu efficiency anti-numu efficiency

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Near DetectorsNear Detectors

beam3 m

3 m

B>1 T

~20 m

High Res DetectorHigh Res DetectorMini-MINDMini-MIND

VertexVertexDetectorDetector

Two options

Near detector:– Neutrino flux (<1% precision) and extrapolation to far detector – Charm production (main background) and taus for Non Standard

Interactions (NSI) searches– Cross-sections and other measurements (ie PDFs, sin2W)

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Performance of a Neutrino Factory with Performance of a Neutrino Factory with MINDMIND

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Flexible design of Neutrino Flexible design of Neutrino FactoryFactory

Optimisation for one baseline as function of 13

For large 13:

Energy 10 GeV

Baseline 2000 km

100 kton MIND

For small 13:

Energy ~25 GeV

Baseline ~4000 km

100 kton MIND

Contours of CP coverage

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Neutrino Factory performanceNeutrino Factory performance Optimised performance for small 13 (25 GeV, two detectors)

and large 13 (10 GeV, 100 kton detector) MIND analysis Performance based on 5 GeV, 1300 km, 20 kton

Totally Active Scintillator Detector (TASD, magenta)

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Neutrino Factory performanceNeutrino Factory performance Optimised performance for small 13 (25 GeV, two detectors)

and large 13 (10 GeV, 100 kton detector) MIND analysis

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Neutrino Factory performanceNeutrino Factory performance Comparison Neutrino Factory and other facilities

– Neutrino Factory outperforms all other facilities

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ConclusionsConclusions International Design Study is progressing on course

– Interim Design Report delivered March 2011

– We had successful ECFA review May 2011 (final report due soon)

– On target to produce Reference Design Report, including performance and costs by 2013

Main concepts for accelerator systems have been defined – Main areas of work are at interfaces between components

Two Magnetised Iron Neutrino Detectors (MIND) at standard Neutrino Factory (25 GeV) is small 13 baseline:– 2500-5000 km with100 kton mass – 7000-8000 km (magic baseline) with 50 kton

10 GeV Neutrino Factory with one 100 kton MIND shows best performance for large 13 (sin2 13> 10-2)

Conceptual design for near detector being established

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Backup Backup slidesslides

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Expected neutrino event rates in Expected neutrino event rates in MINDMIND

Event rates 100 kton

MIND at 4000 km

(for 1021 decays)

nue CCanti-numu CC

anti-nu NCnu NC

sin2213 CC e CC + e NC signal

4×10-2 2.5×105 7.0×105 3.1×105 1.2×104

5×10-5 2.5×105 7.2×105 3.2×105 2.2×102

Need 10-4 bkg

suppression

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MIND: signal efficiency MIND: signal efficiency

Difference in numu and anti-numu efficiencies: effectively only because of Bjorken y distribution (inelasticity) of neutrinos and antineutrinos

-CC

-CC

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MIND: systematic errorsMIND: systematic errors Systematic errors: hadronic energy & angular resolution

Systematic errors: ratio of QES/DIS, 1/DIS, “Other”/DIS

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MIND: tau contaminationMIND: tau contamination Tau neutrino simulations using GENIE already implemented

― New results since IDR: signal right-sign

nutau as numu anti-nutau as anti-numu

anti-nutau as numu nutau as anti-numu

― New results since IDR: signal wrong-sign

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RoadmapRoadmap

Ph

ysic

sP

hys

ics

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05

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06

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07

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Neutrino Factory roadmap

MICE

ISS

International Design Study

Neutrino Factory project

Interim Design Report

Reference Design Report

MERIT

EMMA

Detector and diagnostic systems development

EUROnu