neutrino mass hierarchy, status of the flavor problem (discussion session)
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Neutrino mass hierarchy, status of the flavor problem (discussion session). Invisibles 2013 July 15-19, 2013 Durham , United Kingdom Walter Winter Universität Würzburg. TexPoint fonts used in EMF: A A A A A A A A. Mass hierarchy?. There is a new kid in town!. Mass hierarchy: PINGU?. - PowerPoint PPT PresentationTRANSCRIPT
Neutrino mass hierarchy,status of the flavor problem(discussion session)
Invisibles 2013July 15-19, 2013
Durham, United Kingdom
Walter Winter
Universität Würzburg
2
Mass hierarchy?
There is a new kidin town!
3
Mass hierarchy: PINGU?W. Winter,
arXiv:1305.5539, PRD(~20 string version, full three flavor,
full parameter degeneracy, GLoBES)
PINGU official, arXiv:1306.5846
(similar sensitivity obtainedby Blennow, Schwetz, 1306.3988;
Choubey confirms …)
4
Mass hierarchy: Summary?
Option Timescale (3)
Addl. cost Risk/challenge
Existing experiments
>> 2025 Operation Exposure
PINGU/ORCA
~ 2020-2022
Low+
predictable
Detector perf., 23
LBNE > 2022 High CP
Daya Bay-II ~ 2025? Moderate Energy resolution
Supernova 2013-2113?
None Model; no warranty
5
Impact of “newcomers“?
Elisa Resconi: "How would the beam strategy change if the mass hierarchy came from PINGU/ORCA?"
Looked into that, in particular, in LBNE reconfiguration report (T2HK: no effect)http://www.fnal.gov/directorate/lbne_reconfiguration/files/LBNE-Reconfiguration-Steering-Committee-Report-August2012.pdf
Conclusions (if MH dropped): In phase I, Fermilab Soudan (underground) clearly
preferred (“broadest phase I physics program“, astrophysics)
But: no upgrade beyond 1.1 MW Preferance of FNAL-Homestake unchanged!?
6
A theorist‘s dream?
Beam to South Pole (PINGU) L ~ 11800 km from FNAL,
CERN, JHF etc to South Pole
Flux x param. resonance x Megaton detector = Mass hierarchy with short pipe beam
Core
W. W
inter,
arXiv:1305.5539, P
RD
7
13: impact on theory of flavor?
Structure:A4 TBM, S4, …
Anarchy:Random
draw of matrix?
13 very small very large
Different flavor symmetry?
Fixes:Corrections?CL sector?
RGR running?
Some structure + randomness:
Froggatt-Nielsen?
vs.
Quark-leptoncomplementarity:
13 ~ C?
Tri-bimaximal mixings:Dead or alive?
What are the minimalrequirements for a
successful state-of-the-artflavor model?
8
CP phase Measurement requires (most probably) new long-baseline
experiment How much precision does one actually need?
Consequences of measurement for … Leptogenesis? Flavor models? Lepton flavor violation, other observables? Sum rules: charged lepton vs neutrino mixing matrix?
There seems to be increasing awareness in theory/model community (13 known reduces the d.o.f. …) to describe origin: “Geometric“? Random O(1) complex Yukawa? From SSB? …
However: my impression in many models: phases just “mess up things“! Transition of awareness needed?