# Presentation: 082964

## Study of the Physics of Neutrinos

- _[Sponsored by the American Physical Society Divisions of —](mailto:beacom@fnal.gov)_
- _[ ](mailto:beacom@fnal.gov)__[Particles and Fields](mailto:beacom@fnal.gov)_
- _[ Nuclear Physics](mailto:beacom@fnal.gov)_
- _[ Astrophysics](mailto:beacom@fnal.gov)_
- _[ Physics of Beams](mailto:beacom@fnal.gov)_
- _[Organizational meeting was held December 2003.](mailto:beacom@fnal.gov)_
- _[	](mailto:beacom@fnal.gov)_		_[www.neutrinooscillation.org/studyaps/       ](mailto:beacom@fnal.gov)_
- _[Final report will be completed August 2004.](mailto:beacom@fnal.gov)_

- (Boris Kayser at the Superbeam Working Group meeting, Jan. 29-30, ‘04)

## Our blessing —
Compelling evidence for neutrino mass and mixing.

Our opportunity —
To answer the neutrino questions raised by this discovery.

Our purpose —
To ensure that we make the best possible use of this opportunity.

- Compelling evidence for neutrino mass and mixing.
- Our opportunity —
- To answer the neutrino questions raised by this discovery.
- Our purpose —
- To ensure that we make the best possible use of this opportunity.

## Some of the Open Questions

- What physics is responsible for neutrino masses and mixing?
- How many neutrino species are there?Are there sterile neutrinos?
- What is the neutrino mass spectral pattern?
- What is the scale of neutrino mass?
- Are neutrinos Majorana particles ()?
- What is the leptonic mixing matrix?
- Do neutrino interactions violate CP?
- Is leptonic CP responsible for the baryon asymmetry in the universe?

## Are there surprises?
Rapid  decay?
Non-Standard-Model  interactions?
Towers of sterile neutrinos from extra dimensions?
???

- Rapid  decay?
- Non-Standard-Model  interactions?
- Towers of sterile neutrinos from extra dimensions?
- ???

## The Purposes of the Study

- — Primary Purpose —
- To move towards a coherent strategy for answering the open neutrino questions — a clear, unified plan that funding sources can easily consider and promote.
- To this end, we will—
- Identify the most important questions
- Evaluate the physics reach of the proposed ways of answering them
- Examine how different facilities and experiments complement each other
- Create a decision tree
- Determine an intelligent sequence of facilities and experiments

## Our findings will guide the creation of the future neutrino program.
To quote our Charge —
“The Study will lay scientific groundwork for the choices that must be made during the next few years.”

— Secondary Purpose —
To explain to our colleagues in other areas of physics, our funding sources, and the general public why neutrino physics is now so exciting.

- To quote our Charge —
- “The Study will lay scientific groundwork for the choices that must be made during the next few years.”
- — Secondary Purpose —
- To explain to our colleagues in other areas of physics, our funding sources, and the general public why neutrino physics is now so exciting.

## Charge to each Working Group

- Analyze the physics reach of your experimental approach.
- Consider what your approach can contribute to answering the open questions.
- Ensure that the relevant experiments are represented within your group.
- Provide independent technical evaluation of ideas.

## Targets

- Organizing Committee and Working Group Leaders hold Mid-Course Correction Meeting 		April 1-2 or 4-5.
- Purpose: To assess the progress of the Working Groups and to coordinate their activities.
- Entire Study holds three-day Final General Meeting during June 23-28 in Aspen.
- By the end of this meeting:
- The working group findings
- Final cross-working-group coordination
- Preliminary study conclusions

## Our Final Product

- A ~300 page written report.
- Contents —
- Contributions from individual working group members
- A summary for each working group
- An integrated summary of the study’s findings, written by the working group leaders, the organizing committee, and a few additional generous study participants

## The Structure of the Study

- _Chairmen_
- Stuart Freedman, Boris Kayser
- _Organizing Committee_
- Janet Conrad, Guido Drexlin,
- Belen Gavela, Takaaki Kajita,
- Paul Langacker, Keith Olive,
- Bob Palmer, Georg Raffelt,
- Hamish Robertson, Stan Wojcicki
- Lincoln Wolfenstein

## Working Groups — The Central Element

- Each working group is defined by an experimental approach.
- The groups, their leaders, and their first meeting —
- Solar and Atmospheric Neutrino Experiments
- John Bahcall <jnb@ias.edu>, Josh Klein <jrk@physics.utexas.edu>
- 				January 19, by phone
- Reactor Neutrino Experiments
- Gabriela Barenboim <gabriela@fnal.gov>, Ed Blucher <blucher@hep.uchicago.edu>
- 				February 7-8, Chicago
- Superbeam Experiments and Development
- Bill Marciano <marciano@bnl.gov>, Doug Michael <michael@hep.caltech.edu>
- 			January 29-30, Fermilab

## Neutrino Factory and Beta Beam Experiments and Development
Stephen Geer <sgeer@fnal.gov>, Michael Zisman <mszisman@lbl.gov>
March 3-4, tentatively at Argonne

Neutrinoless Double Beta Decay and Direct Searches for Neutrino Mass
Steve Elliott <elliotts@lanl.gov>, Petr Vogel <pxv@caltech.edu>
February 27-28, Caltech

What Cosmology/Astrophysics and Neutrino Physics can Teach Each Other
Steve Barwick <barwick@HEP.ps.uci.edu>, John Beacom <beacom@fnal.gov>
Tentatively February 5, by phone

- Stephen Geer <sgeer@fnal.gov>, Michael Zisman <mszisman@lbl.gov>
- March 3-4, tentatively at Argonne
- Neutrinoless Double Beta Decay and Direct Searches for Neutrino Mass
- Steve Elliott <elliotts@lanl.gov>, Petr Vogel <pxv@caltech.edu>
- February 27-28, Caltech
- What Cosmology/Astrophysics and Neutrino Physics can Teach Each Other
- Steve Barwick <barwick@HEP.ps.uci.edu>, John Beacom <_[beacom@fnal.](mailto:beacom@fnal.gov)__[gov](mailto:beacom@fnal.gov)__[>](mailto:beacom@fnal.gov)_
- Tentatively February 5, by phone

## Theorists participate in all working groups.
They will also discuss issues like how best to use future measurements to discriminate among theoretical models.
Coordinator of theoretical discussions:
Rabi Mohapatra <rmohapat@physics.umd.edu> 

To also join any other working group, please contact its leaders.

- They will also discuss issues like how best to use future measurements to discriminate among theoretical models.
- Coordinator of theoretical discussions:
- Rabi Mohapatra <rmohapat@physics.umd.edu>
- To also join any other working group, please contact its leaders.

## Conveying the Excitement

- The importance of our secondary purpose — conveying the excitement in neutrino physics — has been made apparent by recent statements by government representatives.
- We will —
- Devote part of our final report to this
- Organize a Neutrino-Fest, with media presence
- Neutrino experts who are especially good at writing for, or speaking to, the broader community are being sought.

## We should be able to make a very strong case for a robust, exciting neutrino program.

Both DOE and NSF have made it clear that they will be listening to us.

Good Luck!

- Both DOE and NSF have made it clear that they will be listening to us.
- Good Luck!