1. Neutrino Oscillation Physics with a Neutrino Factory
EPS-HEP Conference, Grenoble
on behalf of IDS-NF Collaboration
Paul Soler, 21 July 2011

2. EPS-HEP, Grenoble: 21st July 2011
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:
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 study
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
EPS-HEP, Grenoble: 21st July 2011

3. EPS-HEP, Grenoble: 21st July 2011
Neutrino Factory Baseline
Two Magnetised Iron Neutrino Detectors (MIND):
100 kton at km
50 kton at km
Baseline constantly under
review in light of new
physics results
EPS-HEP, Grenoble: 21st July 2011

4. EPS-HEP, Grenoble: 21st July 2011
Physics Case for a Neutrino Factory
EPS-HEP, Grenoble: 21st July 2011

5. Neutrino Oscillations in Matter
Matter oscillation results for three neutrinos:
(MSW effect)
Minakata & Nunokawa JHEP 2001
where is for
EPS-HEP, Grenoble: 21st July 2011

6. Neutrino Oscillations in Matter
Matter oscillation results for three neutrinos:
(MSW effect)
Only one term
in equation
Magic baseline:
Clean determination of q13
Magic baseline only depends
on value of density of Earth
where is for
EPS-HEP, Grenoble: 21st July 2011

7. EPS-HEP, Grenoble: 21st July 2011
Neutrino Oscillation fits
Global fit provides:
sin2q12=
Dm212 = ×10-5 eV2
sin2q23=0.510.06
Dm312=2.450.09×10-3 eV2
Schwetz, Tortola, Valle
Normal
Inverted
Hints for non-zero q13: NH(IH)
T2K: 0.03(0.04)<sin2q13<0.28(0.34) (2.5s)
MINOS: 0<sin2q13<0.12(0.19) (1.7s)
Reactors: sin2q13= (2.3s)
Combined: sin2q13=0.021(0.025)±0.007
Yet to be defined in detail:
Confirm q13 value
Is q23=p/4,<p/4 or >p/4?
Mass hierarchy: sign Dm312
CP violation phase d
EPS-HEP, Grenoble: 21st July 2011
Fogli et al.

8. EPS-HEP, Grenoble: 21st July 2011
Neutrino Factory Accelerator and Detectors
EPS-HEP, Grenoble: 21st July 2011

9. EPS-HEP, Grenoble: 21st July 2011
Neutrino Factory Baseline
Proton driver
Proton beam ~8 GeV on target
Target, capture and decay
Create p, decay into m (MERIT)
Bunching and phase rotation
Reduce DE 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
Neutrino spectra
calculable to high
accuracy
See poster on Neutrino Factory
accelerator facility
EPS-HEP, Grenoble: 21st July 2011

10. Baseline for a Neutrino Factory: MIND
Golden channel signature: appearance of “wrong-sign” muons in magnetised iron calorimeter
Magnetic Iron Neutrino Detector (MIND)
IDS-NF simulations for 25 GeV NuFact:
Two far detectors:
km baseline: 100 kton
km (magic) baseline: 50 kton
Appearance of “wrong-sign” muons
Segmentation:
3 cm Fe + 2 cm scintillator n
50%
wrong
sign
muon
detector
m long
14mx14mx3cm plates
Toroidal magnetic field: T
Engineering well advanced
See poster on
Neutrino Factory
detectors
EPS-HEP, Grenoble: 21st July 2011

11. EPS-HEP, Grenoble: 21st July 2011
MIND analysis
Curvature error (CC rejection) and NC rejection
Num hits > 150
nm-CC
nm-CC
CC signal
nm-CC
nm-CC
Kinematic cuts: Neutrino energy (En=Em+Ehad) vs
EPS-HEP, Grenoble: 21st July 2011

12. MIND: CC and NC background
Analysis with Nuance and GEANT4:
anti-numu as numu
numu as anti-numu
CC background
NC as numu
NC as anti-numu
NC background
EPS-HEP, Grenoble: 21st July 2011

13. MIND: ne background and signal
Analysis with Nuance and GEANT4:
nue as numu
anti-nue as anti-numu
nue background
numu efficiency
anti-numu efficiency
Signal efficiencies
EPS-HEP, Grenoble: 21st July 2011

14. EPS-HEP, Grenoble: 21st July 2011
Near Detectors
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, sin2qW)
n beam
3 m
B>1 T
~20 m
High Res Detector
Mini-MIND
Vertex
Detector
Two options
EPS-HEP, Grenoble: 21st July 2011

15. EPS-HEP, Grenoble: 21st July 2011
Performance of a Neutrino Factory with MIND
EPS-HEP, Grenoble: 21st July 2011

16. Flexible design of Neutrino Factory
Optimisation for one baseline as function of q13
Contours of CP coverage
For large q13:
Energy 10 GeV
Baseline 2000 km
100 kton MIND
For small q13:
Energy ~25 GeV
Baseline ~4000 km
100 kton MIND
EPS-HEP, Grenoble: 21st July 2011

17. Neutrino Factory performance
Optimised performance for small q13 (25 GeV, two detectors) and large q13 (10 GeV, 100 kton detector) MIND analysis
Performance based on 5 GeV, 1300 km, 20 kton Totally Active Scintillator Detector (TASD, magenta)
EPS-HEP, Grenoble: 21st July 2011

18. Neutrino Factory performance
Optimised performance for small q13 (25 GeV, two detectors) and large q13 (10 GeV, 100 kton detector) MIND analysis
EPS-HEP, Grenoble: 21st July 2011

19. Neutrino Factory performance
Comparison Neutrino Factory and other facilities
Neutrino Factory outperforms all other facilities
EPS-HEP, Grenoble: 21st July 2011

20. EPS-HEP, Grenoble: 21st July 2011
Conclusions
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 q13 baseline:
km with100 kton mass
km (magic baseline) with 50 kton
10 GeV Neutrino Factory with one 100 kton MIND shows best performance for large q13 (sin2 q13> 10-2)
Conceptual design for near detector being established
EPS-HEP, Grenoble: 21st July 2011

21. EPS-HEP, Grenoble: 21st July 2011
Backup slides
EPS-HEP, Grenoble: 21st July 2011

22. Expected neutrino event rates in MIND
sin22q13
nm CC
ne CC
nm + ne NC
nm signal
4×10-2
2.5×105
7.0×105
3.1×105
1.2×104
5×10-5
7.2×105
3.2×105
2.2×102
Event rates 100 kton
MIND at 4000 km
(for 1021 m decays)
Need 10-4 bkg
suppression
anti-numu CC
nue CC
anti-nu NC
nu NC
EPS-HEP, Grenoble: 21st July 2011

23. MIND: signal efficiency
Difference in numu and anti-numu efficiencies: effectively only because of Bjorken y distribution (inelasticity) of neutrinos and antineutrinos
nm-CC
EPS-HEP, Grenoble: 21st July 2011

24. MIND: systematic errors
Systematic errors: hadronic energy & angular resolution
Systematic errors: ratio of QES/DIS, 1p/DIS, “Other”/DIS
EPS-HEP, Grenoble: 21st July 2011

25. MIND: tau contamination
Tau neutrino simulations using GENIE already implemented
New results since IDR: nt signal right-sign
nutau as numu
anti-nutau as anti-numu
New results since IDR: nt signal wrong-sign
anti-nutau as numu
nutau as anti-numu
EPS-HEP, Grenoble: 21st July 2011

26. EPS-HEP, Grenoble: 21st July 2011
Roadmap
EPS-HEP, Grenoble: 21st July 2011