NuFact04 WG4 - Intense Muon PhysicsConveneers: M. Grassi (INFN, Pisa), K. Ishida (RIKEN), Y. Semertzidis (BNL)

Summary of WG4, Part Two. Yannis Semertzidis, BNL

1 August, 2004

Most muon physics experiments are statistics limited.

The prospect of intense muon sources is very exciting!

Intense Muon Physics, Part two

• Lepton Flavor Violation (LFV)

• Muon EDM and g-2

• Precision measurement of muon properties

Lepton Flavor Violation

11:30-12:00 A variety of lepton number violating processes related to Majorana nature of neutrino masses

C. S. Lim (Kobe)

12:00-12:30 Bi-Maximal mixing at the GUT scale and its applications E. Takasugi (Osaka)

14:00-14:30 Yukawa matrix and lepton flavor violation K. Tsumura (Osaka) 14:30-15:00 Search for lepton flavor violation via the intense high-

energy muon beamS. Kanemura (Osaka)

15:00-15:30 Exploring neutrino models at high energy scale from various processes

T. Shindo (KEK)

15:45-16:15 MEG M. Grassi (Pisa)16:15-16:45 MECO Y. Semertzidis (BNL) 16:45-17:15 PRIME Y. Kuno (Osaka)

Lepton Flavor Violation (LFV) Theories

Muon LFV Experiments

Wednesday July 28

μN→τN’

Three Generations…leptons quarks

G=1 e e u d

G=2 c s

G=3 t b

MECO is searching forthe COHERENTconversion of ein the field of anucleus (Al).

2

2

2W

m

MRate

Neutrino Oscillations:

Y. Okada: “Large effectsare expected in wellmotivated SUSY models”

Supersymmetry Predictions for e Conversion

ProcessCurrent Limit

SUSY level

10-12 10-15

10-11 10-13

10-6 10-9

+ e

- -N e N

Rem (GeV)

100 200 300 100 200 300

0 0

MECO single event sensitivity

10 -11

10 -13

10 -15

10 -19

10 -17

10 -21

Re

Rem (GeV)

Higgs field mixing parameter

J. Hisano et al.

1

10-2

10-4

10-16

10-6

10-8

10-10

10-14

10-12

1940 1950 1960 1970 1980 1990 2000 2010

MECO Goal

History of Lepton Flavor Violation Searches

- N e-N + e+ + e+ e+ e-

K0 +e-

K+ + +e-

E871

SINDRUM2PSI-MEG Goal

MEGA

PRIME

The MEG experiment

1m

e+

Liq. Xe Scin tilla tionDetector

Drift Cham ber

Liq. Xe Scin tilla tionDetector

e+

Tim ing Counter

Stopping TargetThin S uperconducting Coil

M uon Beam

Drift Cham ber

Easy signal selection with + at rest

e+ + Ee = E = 52.8 MeV

Te = T

e = 180°

Single Event Sensitivity 410-14

BR R E E θ t2 2 2acc μ e γ eγ eγΔ Δ Δ Δ 310-

14

Background

Upper Limit at 90% CL BR (e) 110-13

Discovery 4 events (P = 210-3) correspond BR = 210-13

| | | | | | | | | | ‘

1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Data Taking

nownowLoILoI ProposalProposal

RevisedReviseddocumentdocument

AssemblyR & DPlanning

Marco GRASSI (INFN-Pisa)

Proton Beam

Straw Tracker

Crystal Calorimeter

Muon Stopping Target

Muon Production

Target

Production Solenoid

(5.0 T – 2.5 T)

Superconducting Detector Solenoid

Superconducting Transport Solenoid

(2.5 T – 2.1 T)

Collimators

Heat & Radiation Shield

Funding approved starting in FY05Complete the final design june 06

Start magnet channel building dec 07Acceptance testing dec 08

Milestones

MECO at BNLYannis SEMERTZIDIS (BNL)

Discovery: 5 events for 10-16

Proton Beam 40TP/s

PRISM/PRIME Yoshitaka KUNO (OSAKA University)

PRISM is a dedicated muon source of high intensity, narrow energy width, and high purity 1011-1012 /s.

The PRISM-FFAG ring construction has started at Osaka University (5 years).

PRIME is to search for mu-e conversion at a sensitivity of 10-18 with PRISM

LoI’s have been submitted to J-PARC and positively evaluated

The project is open for new collaborators

PRISM

PRIME

Many theoretical models beyond the Standard Model predict LFV, and some of them LNV.

The expected branching ratios span a few orders of magnitude near the present experimental limits

The comparison among the processes constitutes a tool to single out the right model

MEG (e ), MECO and PRIME (-e conversion ) are under construction or design. They will provide results in a few year, with a great discovery potential.

Lepton Flavor Violation

Muon g-2 and EDM

14:00-14:25 Muon g-2 experiment J. Miller (Boston) 14:25-14:55 Hadronic contribution to muon g-2 K. Hagiwara (KEK)14:55-15:30 EDMs in the SUSY ＧＵＴｓ J. Hisano (Tokyo)

15:45-16:10 Muon EDM experiment J. Miller (Boston)

Friday July 30Muon g-2, edm and applications

Difference between 2 and 3 s.d.! Need to run again…New proposal to BNL for a factor >2 improvement in total error

LOI to J-PARC for a factor >10 improvement in total error

K. Hagiwara (KEK): A further factor of 2 to 3 improvement in theory error ispossible…

SUSY Dark Matter

Following Ellis,Olive, Santoso,Spanos. Plot by K. Olive

SUSY Dark Matter

Following Ellis,Olive, Santoso,Spanos. Plot by K. Olive

SUSY: EDM, MDM and Transition Moments (LFV) are in Same Matrix

Expected Muon EDM Value from a

)tan( 10 25

cme 10 210

SUSY22

CP

ad

CPiSUSYSUSY

DM

eDD

Dd

Dm

ea

FDDL

,

,2

and ,2

1 where

,2

1

2

1

2

1 5*5

Baryon-AntiBaryon asymmetry in Universe…

CEDMs in SUSY SU(5) GUT with right-handed neutrinos

0 0500 , 0 500 , tan 10gm GeV a m GeV For

Here, diagonal right-handed neutrino mass matrix is assumed, and then parameters in neutrino sector are given by oscillation data.

Csd

Cdd

(JH, Kakizaki, Nagai, Shimizu)

Deuteron EDM reach Deuteron EDM reach

EDMs in SUSY GUTsJ. Hisano (ICRR, Univ. of Tokyo)

Precision measurement of muon properties

11:30-12:00 Measurement of the transverse e^+ polarization from the decay of polarized mu^+ and its implications on G_F and TRI (time reversal invariance)

W. Fetscher (ETH Zurich)

12:00-12:30 Muon lifetime measurement with pulsed muon beam D. Tomono (KEK)

14:00-14:35 muLAN (muon lifetime) and muon capture F. Gray (Berkeley)

Tuesday July 27Precision measurement of muon properties

Improvement of TRI limit by 10

Measurement of the transverse e^+ polarization from the decay ofpolarized mu^+ and its implications on G_F and TRI (time reversalinvariance)

W. Fetscher (ETH Zurich)

Muon lifetime measurement with pulsed muon beam D. Tomono (KEK)

pulsed muon method to allow ~10000 muon stops in a time window

muon life time

to more than 1012 statistics (GF < 0.5 ppm)

muLAN (muon lifetime) and muon capture F. Gray (Berkeley)

muon capturegP (weak probe of strong interaction physics)

protiumu gas (0.01 LHD) and TPC

muon lifetime

NuFact04 WG4 - Intense Muon Physics

Summary of WG4, Part Two.

•Most muon physics experiments are currently statistics limited.

•LFV, Muon g-2, EDMs, and Muon Decay Parameter Experiments are very exciting.

•The discovery potential is great!

SUSY Dark Matter

Following Ellis,Olive, Santoso,Spanos. Plot by K. Olive