# Presentation: 250609

## Muon CollaborationMeeting

- Steve Geer                                                                    Collaboration Meeting,    14-17 Feb, 2005

- WELCOME

## Meeting Focus

- Broad review of the status of our R&D and our progress over the last year.
- Opportunity to discuss our plans for this year and beyond.

## Muon Collaboration Goals

- “*To study and develop the theoretical tools and the software **simulation tools, and to carry out R&D on the unique hardware,**required for the design of Neutrino Factories and Muon Colliders*.”

- The collaboration is governed by a charter which defines its
- goals and organization. The goals are defined :-

## Evolution of Physics Motivation

- _Muon Collider_:  Physics case as strong as it ever was.
- _Neutrino Factory_:  Physics case as strong or strongerthan it ever was.
- NOTE:  Neutrino physics is a very hot topic, and neutrino factories are seen as the ultimate tool for neutrino physics  there is a strong case for our R&D.

## Neutrinos are Everywhere

- Neutrinos outnumber ordinary matter particles in the Universe (electrons, protons, neutrons) by a factor of ten billion.
- Depending on their masses they may account for a  few %  of the unknown “dark matter”  in the UniverseNeutrinos are important for stellar processes:  ~71010 cm-2s-1 stream through the Earth from the sun. Neutrinos also govern Supernovae dynamics, and hence heavy element production.
- If there is CP Violation in the neutrino sector, then neutrino physics might ultimately be responsible for Baryogenesis.

- To understand the nature of the Universe in which we live we must understand the properties of the neutrino.

## Neutrinos Oscillations are Exciting

- The Standard Model needs modification accommodate neutrino mass terms, which require either the existence of right-handed neutrinos  Dirac mass terms, or a violation of lepton number conservation  Majorana mass terms. The physics of neutrino masses & mixings is physics beyond the Standard Model

- Neutrinos have nonzero masses and mixings !

- This is exciting because:

- We don’t know the neutrino mass spectrum  but we do know that neutrino masses & mass splittings are tiny compared to the masses of the other fundamental fermions. This suggests radically new physics, which perhaps originates at the GUT or Planck Scale, or indicates the existence of new spatial dimensions, or .....

## Neutrino Measurements Drive Theoretical Ideas

- Although we don’t have complete knowledge of the neutrino mixing matrix, we do know it is qualitatively very different from the quark mixing matrix. This necessarily constrains theoretical ideas about the underlying relationship between quarks and leptons.
- Over the last few years knowledge of neutrino oscillation parametershas eliminated a previous generation of GUT models, leading to a newset of models designed to accommodate the data.
- Further oscillation measurements will necessarily reject the majorityof the new models, and hopefully lead to new ideas about physics beyond the Standard Model
- Neutrino Oscillation Measurements Drive Theoretical Ideas. This is expected to continue to be the case throughout the Proton Driver era.

## Neutrino Mixing

- Within the framework of 3-flavor mixing, the 3 known flavor eigenstates (e, , ) are related to 3 neutrino mass eigenstates (1, 2, 3) :

- We know that UMNS  is very different from the CKM Matrix

## Neutrino Mixing Matrix

- In analogy with the CKM matrix, UMNS can be  parameterized using 3 mixing angles (12 , 23 , 13 ) and one complex phase () :

- We do not know the values of 13 or the CP phase .  If 13 and  are
- non-zero, there will be CP Violation in the neutrino sector.

## Neutrino Mass Spectrum

- The oscillations are driven by the mass splittings:   m2ij    m2i - m2j

## Neutrino Measurements

- For the moment, set aside the LSND result. From the solar-, atmospheric-, and reactor-neutrino data we already know a lot about the mixing matrix and mass splittings:

- ...  but note that we have only an upper limit on 13, and know nothing about   We need to search for   e oscillations !

- Solar Neutrinos

- Atmos. Neutrinos

-   e not seen

## Physics Sensitivity

-      sin2213

- Fraction of -space

- CP Violation (3)

- Mass
- Hierarchy
- (95% CL)

- 0.1

- 0.1

- 0.01

- 0.01

- 0.001

- 0.001

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## In the last year our collaboration been very active ...

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## MEETINGS:  NUFACT04 – NUFACT05

## Our R&D Program is becoming increasingly International

- MICE has scientific approval and some funding
- Targetry experiment at CERN is (almost) approved
- FFAG ring studies and planning for a future international demonstration experiment proceeding
- NUFACT meetings remain healthy (see you at Frascati , June 21-26  !)

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## Funding is tight but ...

- 1. We had a strong MUTAC review April last year:

- Our base FY04 MC funding level (wrt FY03) was flat, but we       succeeded in getting some supplementary funds.
- In FY05 the base MC DOE funding is up 300K$ (earmarked for MICE).

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## ... Ups and Downs ...

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## FY06 DOE  Budget Request

- Significant Program Shifts

- Room for guarded optimisim

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## MCOG Request

- MCOG wants to make sure that, given realistic funding levels,
- our plans match available resources, and goals are clear.
- MCOG has requested a 5-year “strategic” plan, assuming flat funding. We can also produce a more optimistic plan based on an increased funding scenario (but should assume no more than a factor of 2, say, increase).
- Our strategic plan should be ready before our next MUTACreview (May this year ?) ... this MC meeting is our opportunity to discuss the big picture as a Collaboration ... as we step towards our updated plan.

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004

## AGENDA - 1

## AGENDA - 2

## AGENDA - 3

## AGENDA - 4

## AGENDA - 5

## ... HENCE

- The agenda is full ... so lets get started !

- Steve Geer                                                                   MC Collaboration Meeting  Jan  2004