Transcript reactor_futureoscexp_v4

Reactor Experiments and
Future Neutrino Oscillation Measurements
Slides for the Panel Discussion at the Intensity Frontier
Workshop
https://twindico.hep.anl.gov/indico/conferenceOtherViews.py?view=standard&confId
=742
Karsten Heeger
University of Wisconsin
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor Experiments
• Have discovered and measured
– Δm212
– limits on neutrino magnetic moment
• Have seen indications of
– θ13 (~1.7σ from Double Chooz)
• Will make
– unambiguous discovery of θ13 (with >5σ) if θ13 non-zero and large
– clean, precision measurement of θ13
• Have been proposed to
– make precision measurement of θ12
– determine mass hierarchy
– measure coherent antineutrino scattering
– search for sterile neutrinos
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Recent Past
Karsten Heeger, Univ. of Wisconsin
NUSS, July 13, 2009
Reactor Antineutrino Oscillations
Discovery and Measurement of Reactor Antineutrino Oscillations with
KamLAND
KamLAND, Phys.Rev. D83 (2011) 052002
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Present
Karsten Heeger, Univ. of Wisconsin
NUSS, July 13, 2009
θ13 Measurements With Reactor Experiments
Sensitivity of Reactor Experiments
Mezzetto et al
arXive/1003.5800v1
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Huber et al
JHEP11 (2009) 044
θ13 Measurements With Reactor Experiments
Discovery Potential of Reactor Experiments
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
θ13 Measurements With Reactor Experiments
Summary of Nominal Sensitivities
90% (3σ)
• discovery potential for sin22θ13
• accuracy on |Δm231|
• sensitivity to deviations from maximal θ23 mixing
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Huber et al
JHEP11 (2009) 044
First Results from Double Chooz
sin2(2θ13) = 0.085 ± 0.029(stat) ± 0.042(syst) at 68% CL
http://www.doublechooz.org/
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor and Accelerator Experiments (2011)
Combined Fit of T2K, MINOS, and Double Chooz
Machado et al
arXiv:1111/3330
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Future
Karsten Heeger, Univ. of Wisconsin
NUSS, July 13, 2009
Reactor and Accelerator Experiments (2012)
Expected Improvements in sin22θ13 from Double Chooz and RENO
Daya Bay not included in this work
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Machado et al
arXiv:1111/3330
Reactor and Accelerator Experiments (2012)
Projected Combined Fit of T2K, MINOS, Double Chooz, and RENO in
2012
Daya Bay not included in this work
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Machado et al
arXiv:1111/3330
Reactor and Accelerator Experiments (2012+)
Discovery Potentials as a Function of sin22θ13
90% CL.
θ13
Karsten Heeger, Univ. of Wisconsin
Mass Hierarchy
CPV
Intensity Frontier Workshop, November 29, 2011
Huber et al
JHEP11 (2009) 044
Reactor and Accelerator Experiments (2012+)
CPV
Reactor experiments help for early CPV indication
“In the presence of the reactor experiments, however, the CP
violation discovery potential improves significantly, especially
for the normal hierarchy. If the hierarchy is normal, Daya Bay
may in fact be the key prerequisite to obtain an early hint for
CP violation.”
but sensitivity is limited
“sensitivities for MH and CPV are at the 90% CL......
Increasing the CL leads to drastic loss in sensitivity and
almost nothing can be said about CPV and MH at the 3σ
CL...”
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor and Accelerator Experiments (2012+)
normal hierarchy
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor and Accelerator Experiments (2012+)
reactor experiments improve
constraints if θ13 large
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor and Accelerator Experiments (2012+)
Impact of Reactor Experiments and Upgraded Beams on CPV Searches
with reactor exp
T2K upgrade
0.75 → 1.66 MW from 2015→2016
Project X
0.7 → 2.633 MW from 2018→2019
reactor experiments improve CP
coverage vs time for nominal run plan
(blue)
with reactor exp
upgraded beams
upgraded beams
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor Experiments and LBNE
Discovery Potentials as a Function of sin22θ13
Standard Oscillation Physics
Huber and Kopp
arXiv:1010.3706
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor Experiments and LBNE
Discovery Potentials as a Function of sin22θ13
w/ non-Standard Oscillation Physics
non-standard neutrino interactions are very hard to distinguish
experimentally from standard 3-flavor effects and can lead to a
considerable loss of sensitivity in
• sin22θ13
• mass hierarchy
• CPV
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Huber and Kopp
arXiv:1010.3706
Reactor Experiments and LBNE
Impact of Reactor Experiments on Early CPV Measurements
precision measurement of
θ13 with reactors (Daya
Bay) helps early
measurement of δCP
before LBNE ν running
figure from Huber
personal communication
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor Neutrino Oscillation at Intermediate Baselines
Measuring θ12 at L~50-70km?
1.1
Δm2atm
Δm2sol
1
Large-amplitude
oscillation due to  12
Nosc/Nno_osc
0.9
0.8
θ12
0.7
60 GW·kt·y exposure at 50-70 km
0.6
~4% systematic error from near
detector
0.5
measure sin2(θ12) with ~2%
uncertainty
0.4
0.3
0.1
1
10
Baseline (km)
P(νe→νe)≈1-sin2(2θ12)sin2(Δm221L/4E)
Karsten Heeger, Univ. of Wisconsin
100
Bandyopadhyay et al., Phys. Rev. D67 (2003)
113011.
Luk, 2003,
http://www.physics.hku.hk/~astro/neutrino/index
.html
Minakata et al., hep-ph/0407326
Bandyopadhyay et al., hep-ph/0410283
Intensity Frontier Workshop, November 29, 2011
Reactor Neutrino Oscillation at Intermediate Baselines
Measuring Δm2?
As we know from KamLAND, measurement of spectral distortions provides measure of Δm2
KamLAND 2010
For large sin22θ13 reactor experiments can measure Δm2 with different systematics than
T2K/Nova
1.1
1
Nosc/Nno_osc
0.9
Δm213 ≈ Δm223
Δm2sol
0.8
~5% measurement possible
for sin22θ13 ~ 0.1
0.7
0.6
0.5
Jaffe, personal communication
Luk, 2005
0.4
0.3
0.1
1
10
100
Baseline (km)
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Reactor Neutrino Oscillation at Intermediate Baselines
Measuring Mass Hierarchy at L ~ 60km?
new reactor exp
at L~60km
requires extremely good
E resolution
place at optimized
baseline
Zhan et al, JHEP 1103 (2011) 058
Phys.Rev. D79 (2009) 073007
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Search for Sterile  with Reactor Experiments
θ13 Experiments and Sterile Neutrinos (~1 eV2)
near detector
far detector
Double Chooz setup
oscillations driven by the extra sterile neutrinos would produce a
suppression at both the near and far detectors
challenging to probe θ13 and θ14-driven effects even with
near and far detector
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Bandyopadhyaya and
Choubey
arXive:0707.2481v1
Search for Sterile  with Reactor Experiments
θ13 Experiments and Light Sterile Neutrinos (0.01-0.1 eV2)
Daya Bay setup
near detector
Δm142=1.0x10-2 eV2
no oscillation
far detector
θ14-driven oscillations affect far and near detector data differently
θ14-driven effects impact ones ability to measure sin22θ13,
shape analysis can disentangle θ13 from θ14-driven effects.
roles of near and far detectors may be reversed compared to those
associated to studying θ13 effects
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
de Gouvea and Wytock
arXive:0809.5076
Search for Sterile  with Reactor Experiments
SCRAAM: The Southern California
Reactor Antineutrino Anomaly Monitor
at short baselines a reactor
is not a point source
core ∅: ~3m
baseline: 24m
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Bowden, SNAC 2011
Search for Sterile  with Reactor Experiments
NUCIFER at Osiris
core: σ~0.3m
baseline: 7m
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011
Lhuillier, AAP2011
Karsten Heeger, Univ. of Wisconsin
NUSS, July 13, 2009
Reactor and Accelerator Experiments (2012+)
inverted hierarchy
Huber et al
JHEP11 (2009) 044
Karsten Heeger, Univ. of Wisconsin
Intensity Frontier Workshop, November 29, 2011