wg2 summary -muon physics-

11 June 2003 NuFact'03-WG2 : M. Aoki 1

WG2 Summary-Muon Physics-

Masaharu AokiOsaka University

NuFact'03


Contents

◆Muon PhysicsGolden Trio (-LFV, g-2 and -EDM)

◆Future muon beams◆R&D for the future muon beams

TargetPion Capture & Decay

◆Summary


Muon Physics◆ -LFV

Theory (A de Gouvea)-e conversion in nuclei (M.

Koike)MEG (A. Baldini)MECO (P. Yamin) PRISM/PRIME (A. Sato)

◆ g-2 and -EDM Theory (D. Nomura) g-2 BNL-E821

(L. Roberts)-EDM J-PARC LoI

(W. Morse)

◆ Muon Life Time RAL experiment

(D. Tomono)

Lan (G. Onderwater)

◆ Michel Parameters, etc. TWIST (P. Kitching) T-violation (W. Fetscher)


◆ Neutrino mixing has been established.

◆ Contribution to LFV process

νe = ν1 cosθ +ν 2 sinθν μ = −ν 1 sinθ + ν 2 cosθ

ν Oscillation & Muon LFV

∝ ( mν

/ mW

)4

≈ 10− 26

Muon LFV process isSensitive to New Physics

Beyond the neutrino Mixing.

A. de Gouvea


◆ SU(5) SUSY-GUT Predictiononly a few orders of magnitude below the current experimental limit.

◆ SO(10) SUSY-GUT Predictionenhanced by (m/m)2(~100) from SU(5) prediction.

SUSY-GUT Prediction

Process CurrentLimit

SUSY-GUTlevel

N → e N 10-13 10-16

→ e 10-11 10-14

→ 10-6 10-9

Courtesy Hisano


Muon andν Oscillation


LeptogenesisCPV in CKM is not enough to explain Baryon Asymmetry

→ New sources of CPV beyond the SMν Oscillation + CPV in lepton sector → leptogenesis

Fukugida & Yanagida ‘86

AND if SUSY exists →・ T-violation in muon LFV

・ muon EDM


-EDM

D. Nomura


-EDM & g-2

◆LRS + SeeSaw


Muon g-2


SUSY with the Muonµeµeµeννe µeµeµeννe

~~

-LFV

-EDM g-2-e conversion

→ e md

ms

mb

⎛

⎝ ⎜ ⎜ ⎜

⎞

⎠ ⎟ ⎟ ⎟

mνe

mνμ

mν τ

⎛

⎝

⎜ ⎜ ⎜

⎞

⎠

⎟ ⎟ ⎟

m˜ d

m s

m˜ b

⎛

⎝

⎜ ⎜ ⎜

⎞

⎠

⎟ ⎟ ⎟

m e e 2 Δm e μ

2 Δm e τ 2

Δm μ e 2 m μ μ

2 Δm˜ μ τ 2

Δm τ e 2 Δm τ μ

2 m˜ τ τ 2

⎛

⎝

⎜ ⎜ ⎜

⎞

⎠

⎟ ⎟ ⎟

quark

lepton (neutrino) slepton

squarknormal particles SUSY particles

ex. K-decays, B-decays

ex. neutrino oscillation ex. charged lepton LFV

CPV

µeµeµeννe

~~


New Generation of Muon Experiments

◆ Muon LFVBR( e ) < 10-13 (MEG)BR(N e N) < 10-16 (MECO)BR(N e N) < 10-18

(PRISM/PRIME)

◆ -EDM (J-PARC LoI)d< 10-19 e.cm d < 10-24 e.cm

◆ g-2 (J-PARC LoI)0.7 ppm 0.05 ppm

10-1410-1210-1010-810-610-410-2

1940195019601970198019902000Year

KL0→eK+→πeA→eA→eee→e


MEG and e

1m

e+

Liq. Xe ScintillationDetector

DrifChaber

Liq.XeSciνillaioνDeecor

e+

TiiνCouνer

SoππiνTareThiνSuπercoνduciνCoil

MuoνBea

DrifChaber

Easy signal selection with + at rest

e+ + Ee = E = 52.8 MeV

qe = 180°Detector outline

• Stopped beam of >107 /sec in a 150 m target

• Liquid Xenon calorimeter for detection (scintillation)

- fast: 4 / 22 / 45 ns

- high LY: ~ 0.8 * NaI

- short X0: 2.77 cm

• Solenoid spectrometer & drift chambers for e+ momentum

• Scintillation counters for e+ timing

Talk by A. Baldini


MEG and e (cont'd)

◆Sensitivity

◆Schedule

seleì eeeπ ⋅⋅⋅Ω

⋅⋅=

4RT

1SES 410-14

Single Event Sensitivity

eã2

eã2

ãeìacc ÄÄÄÄ tèEERBR ××××∝ 210-14

310-15

BackgroundscorrBR

1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Planning R & D Assembly Data Taking

nownowLoILoI ProposalProposalRevisedRevised

documentdocument


MECO and N e NStraw

Tracker

Crystal Calorimeter

Muon Stopping Target

Muon Beam Stop

Superconducting Production Solenoid

(5.0 T – 2.5 T)Superconducting

Detector Solenoid (2.0 T – 1.0 T)

Superconducting Transport Solenoid (2.5 T – 2.1 T)

CollimatorsBased on MELC design:

4 x 1013 incident p/sec

1 x 1011 stopping µ/sec

Talk by P. Yamin


MECO and N e N (cont'd)We expect ~ 5 signal events for 107 s (2800 hours) running if Re = 10-16

Contributions to the Signal Rate FactorRunning time (s) 107

Proton flux (Hz) (50% duty factor, 740 kHz micropulse) 4 1013

entering transport solenoid / incident proton 0.0043 stopping probability 0.58 capture probability 0.60Fraction of capture in detection time window 0.49Electron trigger efficiency 0.90Fitting and selection criteria efficiency 0.19

Detected events for Re = 10-16 5.0


N e NTalk by Masafumi Koike


PRISM and N e NTalk by A. Sato


PRIME


€

ω =−emaB + 1

γ 2 −1− a

⎛ ⎝ ⎜

⎞ ⎠ ⎟β × Ec

+ η2Ec

+ β × B ⎛

⎝ ⎜

⎞

⎠ ⎟

⎧ ⎨ ⎪ ⎩ ⎪

⎫ ⎬ ⎪ ⎭ ⎪

-EDM◆Cancel g-2 by external E

E = aBcb2 E=2 MeV/m 、 B=0.25 T

◆E which causes EDM precessionE=Bcb B=0.25 T → E=72 MeV/m

Talk by W. Morse


PRISM-II for -EDM◆ High momentum pion capture

0.7 ~ 1.1 GeV/c◆ Backward decay of pion

p = 500 MeV/cMuon yield ~2×1010

Polarization ~0.6◆ Phase rotation

Transverse Acceptance 800 π mm.mradMomentum acceptance ±30% Decay survivability ~56%

◆ NP2 = 109~1010 /sec d = 10-24 ecm

1st Ring ofFFAG-based Neutrino Factory


Staging Scenario

◆ Pion Capture (MECO)Muon LFV

◆ Neutrino Factory◆ Muon Collider

◆ Muon Factory-II (PRISM-II)Muon EDM

◆High Power Proton DriverMuon g-2

◆ Muon Factory (PRISM)Muon LFV

Muon g-2

Physics outcomesat each stage


process ChargeIntensity pulse

width(nsec)

pulseinterval(sec)

Eνery(MeV)

Moeνusπread(%) πuriy Beasize Polarizaioν

Ν->eΝ'(πulsed) - 10^21 10-100 1-1000 <20 <10 ν/a

Ν->eΝ'(cleaν) - 10^20 10-100 1-1000 <20 3 10^-15(π) c ν/a

−>e + 10^17 DC <1 1 <10 10^-2(e) c ν/ayesifseeν

() + 10^14 ~100 30-100 4 1-10 deπol

()[πioνbea] + 10^14 ~100 30-100 4 1-10 πbea

ichel + 10^16 <0.5 >0.02 30-40 1-3 100

πolarizaioν + 10^16 <0.5 >0.02 30-40 1-3 ~100

-2 +- 10^15 <50 >1000 3100 10^-2 yes

ed +- 10^16 <50 >1000 <1000 10^-3 yes

ao - 10^16 <100 100-1000 1-4loωer 1-5 10^-2(e) c ν/a

lifescieνce + 10^15 1 100-1000 1-4 1-5 ,c ν/a

CF - 10^19 >100 ν/a

€

0107sec∫

Future Muon Beams

◆Discussion at NuFact'02

K. Yoshimura


Muon Physics◆ m-LFV

Theory (A de Gouvea) m-e conversion in nuclei (M. K

oike) MEG (A. Baldini) MECO (P. Yamin) PRISM/PRIME (A. Sato)

◆ g-2 and m-EDM Theory (D. Nomura) g-2 BNL-E821

(L. Roberts) m-EDM J-PARC loI

(W. Morse)

◆ Muon Life Time RAL experiment

(D. Tomono)

Lan (G. Onderwater)

◆ Michel Parameters, etc. TWIST (P. Kitching) T-violation (W. Fetscher)


Muon as Tools

◆Unstable Nuclear PhysicsMuonic X-ray (P. Strasser)

◆Material Science/Biology-SR

◆Energy Production-CF

plenary talk by K. Ishida


Unstable Nuclear Physicswith Muons

◆ Combination of Nuclear Physics and MuonUnique Frontier of Science


R&DTarget, Pion Capture & Decay


Talks◆ Target

R. Bennett Europe Plan H. Kirk US Plan J. Popp MECO target K. Yoshimura PRISM target

◆ Solenoid Capture & Decay Channel K. Paul Optimization H. Ohnishi Heat Load Test

◆ Horn Collection S. Gilardoni P.S. test & vibration measurement B. Autin Funneling

◆ Tools F. Meot Analytical study of decay channel

◆ Low Energy Muon Applications H. Miyatera Dai Omega K. Shimomura Super Omega


MECO Target

inlet outlet

beam direction

highest temperature location

Target Center

Target/Water Interface

Water Channel Center

397 K

293 K

Water Inlet

Titanium Tube Inner Surface

Target Core


PRISM Target

◆ Confine pions inside the target with troidal field B. Autin, @Nufact01

◆ Advantage over Solenoid Low emittance beam Linear transport element

No SC solenoid channel Cheaper!

Cooling condition better?

◆ 1st phase 1000 A DC 100 J

◆ 2nd phase 250 KA 2.5ms Pulse (K2K horn PS) 15 KW

◆ 3rd phase 1 MW? Beam test?


Solenoid Capture & Decay

◆ K. Paul Solenoid OptimizationCapture 20TDecay 5TExit 1.25T


Solenoid Capture & Decay◆ H. Ohnishi Heat Load Test

Measurement/MARS = 1.2~1.3

Prototype Solenoid R&D Plan 1/2.5 scale model Stored Energy = 1MJ

Mockup

240 mm

Thermal balance

Theater

Thermal balance Tbeam


Low-Energy Muons◆ High-Intensity Low-Energy muons for-SR4 MeV, 100% polarizedDai Omega

(H. Miyatera) 4 x 105 +/s

(2.5 kW)Super Omega (K. Shimomura)

◆ Laser ExcitationSuper Slow Muon Beam

(Y. Matsuda)


Summary

◆ The muon holds great potential for discovery of the physics beyond the Standard Model.

◆ Technologies developed for the world's Neutrino Factories are also very important for the future of muon physics or vise versa.

◆ Staging is a key toward the realization of the neutrino factory and muon collider.


End of Slide

11 June 2003 NuFact'03-WG2 : M. Aoki 37Bill Marciano at annual BNL/HEP Review, 4/03 from a talk by P. Yamin

Muon Physics isan Essential Component


PRISM and N e N

◆ Budget approval for PRISM-FFAG ConstructionFFAG ringOne RFKicker

◆ 5 year R&DPhase rotationIonization cooling


BNL g-2 experiment

•p = 3.1 GeV/c

€

aμ + =11659204(7)(5) ×10−10 (0.7 ppm)

Talk by L. Roberts


Muon Lifetime Measurement◆ Three fundamental input parameters to SM◆ Da/a ~ 0.045 ppm, DGF/GF ~ 9 ppm, DMZ/MZ ~ 23 ppm


Recent Experiments◆ RAL measurement

D. Tomono

D <10 ppm (syst.)Physics run end.During Analysis

◆ Lan (PSI)G. OnderwaterD ~ 2 ps (1 ppm)

2004~2005 Physics Run◆ FAST (PSI)

2004 Physics Run


Michel Parameters◆TWIST Talk by P. Kitching


T-violation Measurement

Preliminary results consistent with SM within 1.4%

Future Goal

a talk by W. Fetscher


Horn Collection R&D◆ S. Gilardoni

300 kA, 50 Hz,200 M pulses -> 6 weeks

First inner horn 1:1 prototype P.S. Test 30 kA, 1 Hz, 100 s Vibration Measurement by Laser


Horn Collection R&D◆B. Autin FUNNELING

4 independent target-horn-cooling + funnelRepetition frequency 50 -> 12.5 HzAverage current in the horn 14.5 -> 3.6 kAPower dissipation 39 -> 9.7 kW


Tools

◆F. MeotAnalytical Study of the pion decay

wg2 summary -muon physics-

Documents

n oscillationnufact03wg2

n e n contdwe

megbrm n e n

mecobrm n e n

e talk

lepton lfvcpvmmnufact03wg2

aoki n e ntalk

masafumi koikenufact03wg2