Fermilab charged lepton program

1/47B. Casey, BNL Colloquium

• CLFV new mixing matrix

– Multi-decade program to determine 4 free parameters

• Flavor conserving

– Muon g-2

• Flavor violating

– Mu2e

– Next generation Mu2e @ Project X

– meg, me ee , m+e-e+m- also being considered @ Project X

• CP violating

– e EDM with rare isotopes

– m EDM storage ring experiments

e

e

eeee

Around the world

2/47B. Casey, BNL Colloquium

e

e

eeee

m→eg, mN→eN

t→e , geee

t→ , mgmmm

(g-2)e, (g-2)m, (g-2)t

Cold traps,intense muon sources,super B factories,t/charm factories, lepton colliders,Hadron colliders…

CP violation: lepton EDM measurements

Physics for the next 4 decades:

Kick starting the program:the new muon g-2 experiment

3/47B. Casey, BNL Colloquium

• Follow up of BNL experiment but better:– Reuse the storage ring

– 10x longer decay channel

– Segmented calorimeters

– Tracking

– >20x statistics, >2x less systematics

• Coupled with a world wide program to interpret the measurement

target

ring

Pbar complex

It is happening!

4/47B. Casey, BNL Colloquium

Detector R&D:

It is happening!

5/47B. Casey, BNL Colloquium

Full g4 ring simulation

Transport line designs

It’s happening!

6/47B. Casey, BNL Colloquium

• Hadronic Light by Light scattering is the last major component of predicted value based on model dependent calculations

• New program at KLOE to measure dominant contributions to this diagram with 2 photon physics at very low Q2

• With this new data, (g-2)m theory error will be almost entirely driven by independent experiments

It’s happening!

• Lattice community is becoming actively engaged in the g-2 effort

• On the way to providing a first principles calculation of muon g-2

7/47B. Casey, BNL Colloquium

Feng, Petschiles, Jansen, Renner arXiv:1103.4818

3% (!)

It’s happening!

8/47B. Casey, BNL Colloquium

Mandy Rominsky FNALKelly Hardin FNALChris Polly FNALBC FNALLeah Welty-Rieger FNAL/Northwestern

It’s happening!

9/47B. Casey, BNL Colloquium

Matthew Gubanich and David Orozco

Matthew Gubanich and David Orozco from Regis

Don Von Lintig BNL

John Benante BNL

It’s happening!

10/47B. Casey, BNL Colloquium

muon g-2 measurements

independent measurements

Lattice

tau spectral function

R scan

radiative return

electron g-2

two photon

BNL

FNAL

JPARC

g-2

muonium

Conclusions

• ‘Fermilab program’ builds in many ways on Brookhaven ideas and accomplishments

• Fermilab is the right place at the right time

• Brookhaven is a strong collaborator on many of these projects and is essential to the success of the program

11/47B. Casey, BNL Colloquium

“It ain’t over till its over.”-Yogi Berra