Caren Hagner CSTS Saclay 10.03.2004 Present And Near Future of θ 13 & CPV in Neutrino Experiments Caren Hagner Universität Hamburg Neutrino Mixing and.

Caren Hagner CSTS Saclay 10.03.2004

Present And Near Future of θ13 & CPV

in Neutrino Experiments

Present And Near Future of θ13 & CPV

in Neutrino Experiments Caren Hagner

Universität Hamburg

• Neutrino Mixing and Oscillation Probabilities

• LBL Accelerator Experiments– under construction:

Opera, Icarus, Minos– next generation:

T2K, NUMI Off-Axis • Reactor Experiments• Conclusion

Caren Hagner CSTS Saclay 10.03.2004

Neutrino MixingNeutrino Mixing

3

2

1

321

UUU

UUU eeee

3

2

1

1212

1313

2323

100

0

010

0

001

cs

sc

ces

esc

cs

sci

ie

232

3132

2313

2

133

||1||42sin

||sin

sin

ee

e

ie

UU

U

eU

232

3132

2313

2

133

||1||42sin

||sin

sin

ee

e

ie

UU

U

eU

θ23

solar, Kamland atmospheric, K2K

θ13, δ ??

θ12

CHOOZ

Caren Hagner CSTS Saclay 10.03.2004

Neutrino Oscillations: Vacuum (2 Flavors)

2

1

cossin

sincos

e

21

22

221 mmm 2

122

221 mmm

Survival probability:

0 1 2 3 L in Losz

Caren Hagner CSTS Saclay 10.03.2004

Neutrino Parameters: Global Fits

Parameter Best-fit value Range (3σ)

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

Parameter Best-fit value Range (3σ)

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)

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)

Caren Hagner CSTS Saclay 10.03.2004

e e (disappearance experiment)

Pth= 8.5 GWth, L = 1,1 km, M = 5toverburden: 300 mwe

R = 1.01 2.8%(stat)2.7%(syst)R = 1.01 2.8%(stat)2.7%(syst)

M. Apollonio et. al., Eur.Phys.J. C27 (2003) 331-374

CHOOZCHOOZ

@m2atm=2×10-3 eV2

sin22θ13 < 0.2

(90% C.L)

@m2atm=2×10-3 eV2

sin22θ13 < 0.2

(90% C.L)

Caren Hagner CSTS Saclay 10.03.2004

SK: Evidence For Oscillation Pattern

Select events with high resolution in L/ESelect events with high resolution in L/E

from Noon2004

New!

Caren Hagner CSTS Saclay 10.03.2004

SK: Events with high L/E resolution

At 90% CL:

Δm2 = (1.9 ÷ 3.0) × 10-3 eV2 sin22θ ≥ 0.9

At 90% CL:

Δm2 = (1.9 ÷ 3.0) × 10-3 eV2 sin22θ ≥ 0.9

Caren Hagner CSTS Saclay 10.03.2004

3 Flavor Transition Probabilities

with

Reactor experimentsReactor experiments

Δ (α)

(anti-v)

LBL neutrino beamsLBL neutrino beams(In vacuum, on atmospheric osc. scale)(In vacuum, on atmospheric osc. scale)

precision on θ23 and Δm231

θ13 , δCP, mass hierarchybut degeneracies & correlations!

clean measurement of θ13

from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

Caren Hagner CSTS Saclay 10.03.2004

Overview: Experiments Overview: Experiments

Caren Hagner CSTS Saclay 10.03.2004

CNGS Neutrino BeamCNGS Neutrino BeamCern to Gran Sasso: 730km, <Ev> = 17GeVCern to Gran Sasso: 730km, <Ev> = 17GeV

Possible channels:

vμ → vT appearance

vμ → vμ disappearance

vμ → ve appearance

Possible channels:

vμ → vT appearance

vμ → vμ disappearance

vμ → ve appearance

sin22θ13

Caren Hagner CSTS Saclay 10.03.2004

OPERAOPERA

Main goal: search for vT appearance:full mixing, 5 years run at 4.5 × 1019 pot/year

target mass: 1.77 ktonstarget mass: 1.77 ktons

1.8 kton 7.3 11.4 0.7

Caren Hagner CSTS Saclay 10.03.2004

OPERA: Sensitivity to θ13OPERA: Sensitivity to θ13

0.06 or 7o

Fitting simultaneouslyEe, miss. pT, Evis

method: ve appearance in vμ beam (εe = 0.7) background: e from τ decay, ve beam contamination, vμCC events with missing muon (+ another track mimicking e),

vμNC events with neutral pions

method: ve appearance in vμ beam (εe = 0.7) background: e from τ decay, ve beam contamination, vμCC events with missing muon (+ another track mimicking e),

vμNC events with neutral pions

Caren Hagner CSTS Saclay 10.03.2004

OPERA: Time ScheduleOPERA: Time Schedule

• Nov 2003: SM1 magnet RPC installation (ok)

• 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

MINOSMINOS

Initial conditions:LE option → below τ threshold (3.1GeV)2.5×1020 pot/year

New request to Fermilab: 25×1020 pot in 5 yearsNew request to Fermilab: 25×1020 pot in 5 years

Caren Hagner CSTS Saclay 10.03.2004

MINOS: How to measure θ13

+ near detector+ near detector

far detector at Soudan Mine:steel & scintillator calorimetertarget mass: 5.4 ktons

signal: ve appearance in vμ beam (εe = 0.28)

background: e from τ decay (after vμ → vτ), ve beam contamination (~ 1%),

vμCC events with missing muon (+ another track mimicking e), vμNC events with neutral pions

signal: ve appearance in vμ beam (εe = 0.28)

background: e from τ decay (after vμ → vτ), ve beam contamination (~ 1%),

vμCC events with missing muon (+ another track mimicking e), vμNC events with neutral pions

Caren Hagner CSTS Saclay 10.03.2004

MINOS: Time ScheduleMINOS: Time Schedule

• far detector completed in 2003now taking atmospheric neutrino data

• near detector installation starts now

• beam commissioning starts Dec. 2004

• 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

from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

Caren Hagner CSTS Saclay 10.03.2004

Comparison MINOS, ICARUS, OPERA

from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

Caren Hagner CSTS Saclay 10.03.2004

… comparision continued… comparision continued

from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

After 5 years running (90% C.L.)After 5 years running (90% C.L.)

all combined:sin22θ13 ≤ 0.06 (90%CL)all combined:sin22θ13 ≤ 0.06 (90%CL)

Caren Hagner CSTS Saclay 10.03.2004

J-PARC Neutrino Facility J-PARC Neutrino Facility • approved on Dec.20 2004

• construction from 2004-2008 (JFY)

• beam line and near detector @ 280m (without 2km detector)

• start experiment in 2009

• approved on Dec.20 2004

• construction from 2004-2008 (JFY)

• beam line and near detector @ 280m (without 2km detector)

• start experiment in 2009

Off-axis beam: 1,2,3o

tuned to osc.maximum

Page 22: Caren Hagner CSTS Saclay 10.03.2004 Present And Near Future of θ 13 & CPV in Neutrino Experiments Caren Hagner Universität Hamburg Neutrino Mixing and.

T2K: T2K:

→

Page 23: Caren Hagner CSTS Saclay 10.03.2004 Present And Near Future of θ 13 & CPV in Neutrino Experiments Caren Hagner Universität Hamburg Neutrino Mixing and.

T2K: Sensitivity to θ13T2K: Sensitivity to θ13

→

Caren Hagner CSTS Saclay 10.03.2004

Numi Off-Axis ExperimentNumi Off-Axis Experiment(L = 820km)

Off-axis beamneutrino energy

Caren Hagner CSTS Saclay 10.03.2004

NUMI Off-Axis: DetectorsNUMI Off-Axis: Detectors• on the surface• target mass ~ 50ktons• active material: scintillator or RPC• passive material: particle board

RPC detectorScintillator detectorScintillator detector

Caren Hagner CSTS Saclay 10.03.2004

NUMI Off-Axis: Identification of ve

NUMI Off-Axis: Identification of veve event

vμ event

Caren Hagner CSTS Saclay 10.03.2004

NUMI Off-Axis: Identification of ve

Caren Hagner CSTS Saclay 10.03.2004

NUMI Off-Axis: Sensitivity to θ13

Time Schedule:

•R&D proposal submitted

•full proposal in march04

•start construction Oct06

•data taking with 25% of detector in 2008

Time Schedule:

•R&D proposal submitted

•full proposal in march04

•start construction Oct06

•data taking with 25% of detector in 2008

Caren Hagner CSTS Saclay 10.03.2004

Reactor Neutrino Experiments For θ13

• Europe: Double CHOOZ• US: Diablo Canyon, Braidwood, China, Brazil• Japan: KASKA

Idea: similar to CHOOZ reactor experiment, but use near and far detector to reduce systematic errorIdea: similar to CHOOZ reactor experiment, but use near and far detector to reduce systematic error

Caren Hagner CSTS Saclay 10.03.2004

Nuclear reactor1,2 core(s) ON/OFF : ok 4 cores ON/OFF : no !

Near detector5-30 tons> 50 mwe

Far detector5-30 tons

> 200 mwe

Far detector5-30 tons

> 200 mwe

D1 = 0-1 kmD2 = 1-2 km

e e,,

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% !

Reactor Neutrino Experiments: Method

near atm. oscill. maximumnear atm. oscill. maximum