muon collaboration meeting

Muon CollaborationMeeting

Steve Geer Collaboration Meeting, 14-17 Feb, 2005

Muon Collaboration

WELCOME

Meeting FocusMuon Collaboration

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.

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Muon Collaboration GoalsMuon Collaboration

“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 itsgoals and organization. The goals are defined :-

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Evolution of Physics MotivationMuon Collaboration

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.

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Neutrinos are Everywhere 5

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 Universe

Neutrinos are important for stellar processes: ~71010 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 6

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 7

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 8

Within the framework of 3-flavor mixing, the 3 known flavor eigenstates (e, ,

) are related to 3 neutrino mass eigenstates (1, 2, 3) :

= (33)e

( ) 1

( )We know that UMNS is very different from the CKM Matrix

large large small/tiny/0 ?large large largelarge large large( )

~1 small tinysmall ~1 tiny tiny tiny ~1( )

Neutrino Mixing Matrix 9

In analogy with the CKM matrix, UMNS can be parameterized using

3 mixing angles (12 , 23 , 13 ) and one complex phase () :

C12C23 S12C13 S13 e-i

-S12C23 C12C23 S23C13

-C12S23 S13 ei -S12C23 S13 ei

S12S23 -C12S23 C23C13

-C12C23 S13 ei -S12C23 S13 ei

( )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 10

m2sol = 8 x 10–5 eV2, |m2

atm| = 2.5 x 10–3 eV2~ ~

Mass

1

2

3

or

1

23

}m2sol

m2atm

}m2sol

m2atm

Normal Inverted

The oscillations are driven by the mass splittings: m2ij m2

i - m2j

Neutrino MeasurementsFor 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

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Steve Geer MC Collaboration Meeting Jan 2004

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Muon Collaboration Physics Sensitivity

sin2213

Fra

ctio

n of

-s

pace

CP Violation (3)MassHierarchy(95% CL)

0.1 0.10.01 0.010.001 0.001


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Muon Collaboration

In the last year our collaboration been very

active …

MEETINGS: NUFACT04 – NUFACT05

Muon Collaboration


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Muon Collaboration Our R&D Program is becoming increasingly International

1. MICE has scientific approval and some funding

2. Targetry experiment at CERN is (almost) approved

3. FFAG ring studies and planning for a future international demonstration experiment proceeding

4. NUFACT meetings remain healthy (see you at Frascati , June 21-26 !)


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Muon Collaboration Funding is tight but ...

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

2. Our base FY04 MC funding level (wrt FY03) was flat, but we succeeded in getting some supplementary funds.

3. In FY05 the base MC DOE funding is up 300K$ (earmarked for MICE).


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Muon Collaboration … Ups and Downs …

1. NSF 3-year funding ended & no renewed funding for this yet

2. 100K$ x 3 years (=300K$) new NSF funding for MICE

3. ICAR funding ended

4. Muons Inc funding increased


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Muon Collaboration FY06 DOE Budget Request

Significant Program Shifts

Room for guarded optimisim


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Muon Collaboration 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.

AGENDA - 1Muon Collaboration


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Muon Collaboration … HENCE

The agenda is full … so lets get started !

muon collaboration meeting

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