high g li/b b -beam

High Li/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

What we already know

Solar sector

Atm sector

What we still don’t know

13 < 12.9º

cp

Mass hierarchy

Octant of 23

223msignsatm

232tan signsoct

)º34(

eV107.75412

257.06.0

212

m

)º42(

eV104.211823

235.05.0

223

m

M.C. González-García and M. Maltoni arXiv:0704.1800

Beam

P. Zucchelli hep-ph/0107006100

Beam

+

J. Burguet-Castell et al. hep-ph/0312068J. Burguet-Castell et al. hep-ph/0503021

350

Beam

100

Li/BIonization Cooling

C. Rubbia et al. hep-ph/0602032 A. Donini and E. F-M hep-ph/0603261C. Rubbia hep-ph/0609235

Beam

+

350


C. Rubbia et al. hep-ph/0602032 S. K. Agarwalla et al. hep-ph/0610333S. K. Agarwalla et al. hep-ph/0611233S. K. Agarwalla et al. arXiv:0711.1459

The Golden channel in matter

A. Cervera et al. hep-ph/0002108

2cos

2

~sin

2sin~

LLBAL

Batmatm

223sP e

1222

23 2sin c

22

2

~sin~

LB

Batm

13

2 2sin

2

A

Lsol

J~Asol

2sin 2 AL

eFnGA 2atmAB

~

Expanded in

23121313 2sin2sin2sincos~ J

sin 213 < 0.4 05.02

Lsol

E

msol

2

212

E

matm

2

223

where

MagicBaseline7000Km

Resonant enhancement when with E 6GeV

The baselines

5º 0, 90, -90º

7000kmInverted Hierarchy

7000kmNormal 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 213 = 10-3 for

The baselines


5º 0, 90, -90º




Beam

+

350


C.Rubbia et al. hep-ph/0602032

B And LiBeam 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 Detector50kt Magnetized Iron Neutrino Detector: MIND

We consider 9 bins of 1 GeV between 1.5-10.5 GeV

65% signal efficiency

10-4 or 10-5 backgrounds

2.5% and 5% or 10% and 20% systematics in signal and background

Atmospheric background negligible a this energies with bunching

ISS Detector Working Group arXiv:0712.4129

signaleff 0.7

CC charm 10-4-10-5

CC no-charm 10-4-10-5

NC 10-4-10-5

Degeneracies at 2000km

true solution

sign degeneracy

Nominal, Medium and Ultimate fluxes

Loss of sensitivity to CP violation and the mass hierarchy at the 2000km baseline due to the sign degeneracy

CP discovery potential

Combining the two baselines


The sign degeneracy is solved at the 7000km baseline

2000km2000km + 7000km

CP discovery potential


The CP discovery potential with the Ultimate and Medium flux between low and high -Beam

2000km + 7000km ISS Physics Working Group arXiv:0710.4947

13 discovery potential


2000km + 7000km

The Ultimate flux similar to high -Beam The Medium flux between low and high -Beam

The Nominal flux similar to Super-Beams

ISS Physics Working Group arXiv:0710.4947

Sensitivity to the mass hierarchy


2000km + 7000km

All the fluxes worse than the optimum NF but better than the other facilities

ISS Physics Working Group arXiv:0710.4947

Systematics and Backgrounds

2.5/5% and 10/20% systematic error

considered Impact of the background and the systematic errors

very smallPerformance limited by statistics

No improvement if background is lowered below 10-5

Effect of Systematycs Effect of Background

10-5 and 10-4 background considered

Conclusions Strong complementarity between the two

baselines

2000km detector very sensitive to but spoiled by sign degeneracies

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

With Medium flux sensitivity to 13 and the mass hierarchy down to sin2 213 3·10-4

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

The ionization cooling procedure

Li + D →Li + p

Li + He →B + n

C.Rubbia et al. hep-ph/0602032

An excess of 1014 ions/scould be accumulated

Event Rates

Sign(m223

)

2000km

2000km

7000km

7000km

90 + 595 20 155 2

-90 + 206 103 170 1

90 - 235 95 3 67

-90 - 47 274 6 62

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

sin= 0.01

high g li/b b -beam

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