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High g Li/B b -Beam. Enrique Fernández-Martínez, MPI für Physik Munich Based on a collaboration with: P. Coloma, A. Donini and J. López-Pavón. The oscillation parameters. 3s. What we already know Solar sector Atm sector What we still don’t know q 13 < 12.9º d cp Mass hierarchy

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High g Li/B b -Beam

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High g Li/B b-Beam

Enrique Fernández-Martínez,

MPI für Physik Munich

Based on a collaboration with:

P. Coloma, A. Donini and J. López-Pavón


The oscillation parameters

3s

  • What we already know

    • Solar sector

    • Atm sector

  • What we still don’t know

    • q13< 12.9º

    • dcp

    • Mass hierarchy

    • Octant ofq23

M.C. González-García and M. MaltoniarXiv:0704.1800

3s


bBeam

g  100

P. Zucchellihep-ph/0107006


bBeam

+

g  350

J. Burguet-Castell et al.hep-ph/0312068

J. Burguet-Castell et al.hep-ph/0503021


bBeam

Li/B

Ionization

Cooling

g  100

Donini and E. F-M hep-ph/0603261

C. Rubbiahep-ph/0609235

C. Rubbia et al. hep-ph/0602032


bBeam

Li/B

Ionization

Cooling

+

g  350

S. K. Agarwallaet al.hep-ph/0610333

S. K. Agarwallaet al.hep-ph/0611233

S. K. Agarwalla et al. arXiv:0711.1459

C. Rubbia et al. hep-ph/0602032


(_)

(_)

D

2

m

D

=

~

12

=

q

q

q

q

J

cos

sin

2

sin

2

sin

2

sol

2

E

13

13

12

23

D

D

æ

ö

2

L

m

@

D

=

ç

÷

sol

0

.

05

23

atm

2

2

E

è

ø

The Golden channel in matter

Resonantenhancement

whenwith E  6GeV

Magic

Baseline

7000Km

Expanded in

sin 2q13 < 0.4

where

A. Cervera et al.hep-ph/0002108


The baselines

q13 = 5º d = 0, 90, -90º

7000km

InvertedHierarchy

7000km

Normal Hierarchy

Resonant enhancement depending on the hierarchy


Sensitivity to the mass hierarchy

S. K. Agarwalla et al. arXiv:0711.1459

Sensitivity to the mass hierarchy

down to sin2 2q13 = 10-3 for g = 350


The baselines

2000km

Normal Hierarchy

2000km

InvertedHierarchy

q13 = 5º d = 0, 90, -90º

7000km

InvertedHierarchy

7000km

Normal Hierarchy


bBeam

Li/B

Ionization

Cooling

+

C.Rubbia et al. hep-ph/0602032

g  350


B And Lib-Beam fluxes

We consider 3 different fluxes

“Nominal” 2·1018 decays/year

“Medium” 5·1018 decays/year

“Ultimate” 10·1018 decays/year

“Ultimate” flux at 2000km


The Detector

50kt MagnetizedIronNeutrinoDetector:MIND

We consider 9 bins

of 1 GeVbetween

1.5-10.5 GeV

65% signal efficiency

10-4or 10-5backgrounds

2.5% and 5% or

10% and 20%

systematics in signal and background

Atmospheric background negligible a this energies with bunching

CC charm

 10-4-10-5

signal

eff 0.7

CC no-charm

 10-4-10-5

NC  10-4-10-5

ISS Detector WorkingGroup arXiv:0712.4129 


Degeneracies at 2000km

CP discovery potential

signdegeneracy

true solution

Nominal, MediumandUltimatefluxes

Loss of sensitivitytoCP violationand themasshierarchy

at the 2000km baselineduetothesigndegeneracy


Combining the two baselines

2000km + 7000km

2000km

Nominal, MediumandUltimatefluxes

Thesigndegeneracyissolved at the 7000km baseline


CP discovery potential

2000km + 7000km

ISS PhysicsWorkingGroup arXiv:0710.4947 

Nominal, MediumandUltimatefluxes

TheCP discoverypotentialwiththeUltimate

and Medium flux betweenlow and highg b-Beam


q13 discovery potential

2000km + 7000km

ISS PhysicsWorkingGroup arXiv:0710.4947 

Nominal, MediumandUltimatefluxes

TheUltimateflux similar tohighg b-Beam

TheMedium flux betweenlow and highg b-Beam

TheNominal flux similar toSuper-Beams


Sensitivity to the mass hierarchy

2000km + 7000km

ISS PhysicsWorkingGroup arXiv:0710.4947 

Nominal, MediumandUltimatefluxes

AllthefluxesworsethantheoptimumNF

butbetterthantheotherfacilities


Systematics and Backgrounds

Effect of Systematycs

Effect of Background

2.5/5% and 10/20%systematic error considered

10-5and 10-4backgroundconsidered

Impact of the background and the systematic errors very small

Performance limited by statistics

No improvement if background is lowered below 10-5


Conclusions

  • Strong complementarity between the two baselines

    • 2000km detector very sensitive to d but spoiled by sign degeneracies

    • 7000km detector resonant dependence on the mass hierarchy and no dependence on d solves degeneracies

  • With Medium flux sensitivity to q13, dand the mass hierarchy down to sin2 2q13 3·10-4

  • Impact of the background and the systematic errors very small. Performance limited by statistics


The ionization cooling procedure

C.Rubbia et al. hep-ph/0602032

  • 7Li + D →8Li + p

  • 6Li + 3He →8B + n

An excess of 1014 ions/s

could be accumulated


Event Rates

For 10yr exposure of each beam to a 50kt iron detector

sin2 2q13= 0.01


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