Caren Hagner CSTS Saclay 10.03.2004 Present And Near Future of θ 13 & CPV in Neutrino...

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Transcript of Caren Hagner CSTS Saclay 10.03.2004 Present And Near Future of θ 13 & CPV in Neutrino...

Slide 1Present And Near Future of θ13 & CPV
in Neutrino Experiments
LBL Accelerator Experiments
Neutrino Mixing
Survival probability:
Caren Hagner CSTS Saclay 10.03.2004
Neutrino Parameters: Global Fits
Δm221 6.9 × 10-5 eV2 (5.4 ÷ 9.5) × 10-5 eV2
|Δm231| 2.6 × 10-3 eV2 (1.5 ÷ 3.7) × 10-3 eV2
θ12 (sin2 θ12) 33.2o (0.30) 28.6o ÷ 38.6o
θ23 (sin2 θ23) 46.1o (0.52) 33.8o ÷ 58.1o
θ13 (sin2 θ13) 4.4o (0.006) 0o ÷ 13.4o (< 0.054)
δCP - 0 ÷ 2π
Global fit including solar, atmospheric, reactor (Kamland and CHOOZ) and accelerator (K2K) data.
M. Maltoni, T.Schwetz, A.M.Tortola, J.W.F.Valle, Phys. Rev. D68 (2003) 113010,
hep-ph/0309130.
Fixing Δm2atm= 2 × 10-3 eV2 they obtain at 90%C.L. (3σ):
sin2 θ13 ≤ 0.035 (0.066)
sin2 2θ13 ≤ 0.14 (0.25)
CHOOZ
M. Apollonio et. al., Eur.Phys.J. C27 (2003) 331-374
@m2atm=2×10-3 eV2
overburden: 300 mwe
Select events with high resolution in L/E
from Noon2004
SK: Events with high L/E resolution
At 90% CL:
Caren Hagner CSTS Saclay 10.03.2004
3 Flavor Transition Probabilities
precision on θ23 and Δm231
θ13 , δCP, mass hierarchy
with
Δ
(α)
(anti-v)
Overview: Experiments
CNGS Neutrino Beam
Possible channels:
OPERA
full mixing, 5 years run at 4.5 × 1019 pot/year
target mass: 1.77 ktons
OPERA: Sensitivity to θ13
vμCC events with missing muon (+ another track mimicking e),
vμNC events with neutral pions
0.06 or 7o
Ptmiss for theta13=8deg dm23^2=2.5*10^-3eV2, theta23=45deg
Info from M. Komatsu (Nagoya) at Noon04
Fitting simultaneously the Ee, missing pt and Evis distribution -> sensitivity to Theta13 at 90% CL.
Systematics on ve contamination up to 10%
The analysis adds 15% increase in scanning (event locations already known from vtau search)
Caren Hagner CSTS Saclay 10.03.2004
OPERA: Time Schedule
Sep 2004: SM1 target installation
Jan 2005: BAM and BMS installation
July 2005: start filling bricks
May 2006: start neutrino beam
Caren Hagner CSTS Saclay 10.03.2004
MINOS
2.5×1020 pot/year
Caren Hagner CSTS Saclay 10.03.2004
MINOS: How to measure θ13
+ near detector
steel & scintillator calorimeter
ve beam contamination (~ 1%),
vμNC events with neutral pions
Caren Hagner CSTS Saclay 10.03.2004
MINOS: Time Schedule
physics running starts in April 2005
goal in first year: 2.5×1020 pot
Caren Hagner CSTS Saclay 10.03.2004
Comparison MINOS, ICARUS, OPERA
Caren Hagner CSTS Saclay 10.03.2004
Comparison MINOS, ICARUS, OPERA
Caren Hagner CSTS Saclay 10.03.2004
… comparision continued
After 5 years running (90% C.L.)
all combined:
J-PARC Neutrino Facility
start experiment in 2009
T2K:
T2K: Sensitivity to θ13
Numi Off-Axis Experiment
NUMI Off-Axis: Detectors
on the surface
target mass ~ 50ktons
passive material: particle board
ve event
vμ event
Time Schedule:
Europe: Double CHOOZ
Japan: KASKA
but use near and far detector to reduce systematic error
Caren Hagner CSTS Saclay 10.03.2004
Reactor Neutrino Experiments: Method
Isotrope e flux (uranium & plutonium fission fragments)
Detection tag : e + p e+ + n, <E>~ 4 MeV, Threshold ~1.8 MeV
Disappearance experiment: suppression+shape distorsion between the 2 detectors
2 IDENTICAL detectors (CHOOZ, KamLAND, BOREXINO/CTF type)
Minimise the uncertainties on reactor flux & spectrum (2 % in CHOOZ)
Cancel cross section uncertainty (1.9 %)
Challenge: relative normalisation between the two detectors < 1% !
Caren Hagner CSTS Saclay 10.03.2004
Reactor Experiments: Sites
Japan: KASKA
KASKA and KAMLAND
successful negotiations for site
? Start construction 2006
US: Diablo Canyon
Diablo Canyon: Movable Detectors
reactor experiment
Caren Hagner CSTS Saclay 10.03.2004
What can we learn about δ?
Complementarity of accelerator and reactor experiments is very important!
Caren Hagner CSTS Saclay 10.03.2004
Concluding Overview
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