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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

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

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


B beam

bBeam

g  100

P. Zucchellihep-ph/0107006


B beam1

bBeam

+

g  350

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

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


B beam2

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


B beam3

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


The golden channel in matter

(_)

(_)

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

The baselines

q13 = 5º d = 0, 90, -90º

7000km

InvertedHierarchy

7000km

Normal Hierarchy

Resonant enhancement depending on the hierarchy


Sensitivity to the mass 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 baselines1

The baselines

2000km

Normal Hierarchy

2000km

InvertedHierarchy

q13 = 5º d = 0, 90, -90º

7000km

InvertedHierarchy

7000km

Normal Hierarchy


B beam4

bBeam

Li/B

Ionization

Cooling

+

C.Rubbia et al. hep-ph/0602032

g  350


B and li b beam fluxes

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

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

Degeneracies at 2000km

CP discovery potential

signdegeneracy

true solution

Nominal, MediumandUltimatefluxes

Loss of sensitivitytoCP violationand themasshierarchy

at the 2000km baselineduetothesigndegeneracy


Combining the two baselines

Combining the two baselines

2000km + 7000km

2000km

Nominal, MediumandUltimatefluxes

Thesigndegeneracyissolved at the 7000km baseline


Cp discovery potential

CP discovery potential

2000km + 7000km

ISS PhysicsWorkingGroup arXiv:0710.4947 

Nominal, MediumandUltimatefluxes

TheCP discoverypotentialwiththeUltimate

and Medium flux betweenlow and highg b-Beam


Q 13 discovery potential

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 hierarchy1

Sensitivity to the mass hierarchy

2000km + 7000km

ISS PhysicsWorkingGroup arXiv:0710.4947 

Nominal, MediumandUltimatefluxes

AllthefluxesworsethantheoptimumNF

butbetterthantheotherfacilities


Systematics and backgrounds

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

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

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

Event Rates

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

sin2 2q13= 0.01


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