high g li/b b -beam
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
Li/BIonization Cooling
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
2000kmNormal Hierarchy
5º 0, 90, -90º
7000kmInverted Hierarchy
7000kmNormal Hierarchy
2000kmInverted Hierarchy
Beam
+
350
Li/BIonization Cooling
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
Nominal, Medium and Ultimate fluxes
The sign degeneracy is solved at the 7000km baseline
2000km2000km + 7000km
CP discovery potential
Nominal, Medium and Ultimate fluxes
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
Nominal, Medium and Ultimate fluxes
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
Nominal, Medium and Ultimate fluxes
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