Search for Muon - Electron and Muon - Positron Conversion

Limits on the lepton-flavor-violating reactions μ−+Z→e−+Z and μ−+Z→e++(Z-2), muon-electron and muon-positron conversion, have been obtained from a search performed at TRIUMF using a time-projection chamber. Upper limits (90% C.L.) for the branching ratios compared to ordinary muon capture for a titanium target are R—(Ti)=Γ(μ−Ti→e−Ti)/Γ(μ−Ti capture)<4.6×10−12 and R+(Ti)=Γ(μ−Ti→e+Ca*)/Γ(μ−Ti capture)<.1.7×10−10 A smaller data set obtained using a lead target yielded R−(Pb)<4.9×10−10. The implications of these results for extensions of the standard model which allow lepton-flavor violation are discussed.

MUON- NUCLEUS: COHERENT INTERACTION
COHERENT INTERACTION: MUON- NUCLEUS
TITANIUM
LEAD
TRANSITION: (MUON- ELECTRON)
TRANSITION: (MUON- POSITRON)
CHANNEL CROSS SECTION: BRANCHING RATIO
UPPER LIMIT
LEPTON NUMBER: VIOLATION
MUON NUMBER: VIOLATION

References(58)

Figures(0)

A Model of Leptons

Steven Weinberg
(
- MIT, LNS
)

- Phys.Rev.Lett. 19 (1967) 1264-1266,
- Also in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 157-159,
- In *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 185-187,
- In *Rosner, J. L. (ed.): New Particles*, 26-28
•
DOI:
- 10.1103/PhysRevLett.19.1264

Weak and Electromagnetic Interactions

Abdus Salam
(
- Imperial Coll., London and
- ICTP, Trieste
)

- Conf.Proc.C 680519 (1968) 367-377,
- Reprinted in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 160-170, and in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 188-198,
- Also in *Rosner, J.L. (ed.): New particles* 29-39,
- Also in *Ali, A. (ed.) et al.: Selected papers of Abdus Salam* 244-254
•
DOI:
- 10.1142/9789812795915_0034

Muon Number Nonconserving Processes in Gauge Theories of Weak Interactions

Guido Altarelli
(
- Ecole Normale Superieure
)
,
L. Baulieu
(
- Ecole Normale Superieure
)
,
N. Cabibbo
(
- Rome U.
)
,
L. Maiani
(
- Rome U.
)
,
R. Petronzio
(
- Rome U.
)

- Nucl.Phys.B 125 (1977) 285,
- Nucl.Phys.B 130 (1977) 516 (erratum),
- Nucl.Phys.B125 (1977) 285-302 and Paris Ecole Normale Superieure - LPTENS 77-4 (77,REC.MAY) 35p,
- Nucl.Phys.B130 (1977) 516.(Nucl.Phys.B125 (1977) 285-302)
•
DOI:
- 10.1016/0550-3213(77)90254-1

Nonconservation of Separate mu - Lepton and e - Lepton Numbers in Gauge Theories with v+a Currents

T.P. Cheng
(
- Missouri U., St. Louis
)
,
Ling-Fong Li
(
- Carnegie Mellon U.
)

- Phys.Rev.Lett. 38 (1977) 381
•
DOI:
- 10.1103/PhysRevLett.38.381

The Reaction mu- Nucleus --> e- Nucleus in Gauge Theories

W.J. Marciano
(
- Rockefeller U.
)
,
A.I. Sanda
(
- Rockefeller U.
)

- Phys.Rev.Lett. 38 (1977) 1512
•
DOI:
- 10.1103/PhysRevLett.38.1512

The Processes $\mu \rightarrow e + \gamma, \mu \rightarrow e + \overline{e}, \nu' \rightarrow \nu + \gamma$ in the Weinberg-Salam Model with Neutrino Mixing

S.T. Petcov
(
- Dubna, JINR
)

- Sov.J.Nucl.Phys. 25 (1977) 340,
- Yad.Fiz. 25 (1977) 641-648,
- Sov.J.Nucl.Phys. 25 (1977) 698 (erratum),
- Yad.Fiz. 25 (1977) 1336 (erratum)

Rare Muon Decays, Natural Lepton Models, and Doubly Charged Leptons

Frank Wilczek
(
- Princeton U.
)
,
A. Zee
(
- Princeton U.
)

- Phys.Rev.Lett. 38 (1977) 531
•
DOI:
- 10.1103/PhysRevLett.38.531

Lepton Mixing and Neutrino Oscillations

Samoil M. Bilenky
(
- Dubna, JINR
)
,
B. Pontecorvo
(
- Dubna, JINR
)

- Phys.Rept. 41 (1978) 225-261
•
DOI:
- 10.1016/0370-1573(78)90095-9

Neutrino Mass and Spontaneous Parity Nonconservation

- Phys.Rev.Lett. 44 (1980) 912,
•
DOI:
- 10.1103/PhysRevLett.44.912

Neutrino Masses and Mixings in Gauge Models with Spontaneous Parity Violation

Rabindra N. Mohapatra
(
- City Coll., N.Y.
)
,
Goran Senjanovic
(
- Fermilab and
- Maryland U.
)

- Phys.Rev.D 23 (1981) 165
•
DOI:
- 10.1103/PhysRevD.23.165

Left-Handed Neutrino Mass Scale and Spontaneously Broken Lepton Number

G.B. Gelmini
(
- Munich U.
)
,
M. Roncadelli
(
- Munich, Max Planck Inst.
)

- Phys.Lett.B 99 (1981) 411-415
•
DOI:
- 10.1016/0370-2693(81)90559-1

Majorana Neutrinos and Low-energy Tests of Electroweak Models

Riazuddin
(
- Virginia Tech.
)
,
R.E. Marshak
(
- Virginia Tech.
)
,
Rabindra N. Mohapatra
(
- City Coll., N.Y.
)

- Phys.Rev.D 24 (1981) 1310-1317,
- Phys. Rev. D24 ( 1981) 1310-1317
•
DOI:
- 10.1103/PhysRevD.24.1310

A Mechanism for Nonconservation of Muon Number

J.D. Bjorken
(
- SLAC
)
,
Steven Weinberg
(
- Stanford U., Phys. Dept.
)

- Phys.Rev.Lett. 38 (1977) 622
•
DOI:
- 10.1103/PhysRevLett.38.622

Flavor Violation, Scalar Particles and Leptoquarks

Oruganti U. Shanker
(
- TRIUMF
)

- Nucl.Phys.B 206 (1982) 253-272
•
DOI:
- 10.1016/0550-3213(82)90534-X

Theoretical perspective on strange physics

John R. Ellis
(
- SLAC
)

- AIP Conf.Proc. 102 (1983) 191-224
•
DOI:
- 10.1063/1.34149

Challenges for Extended Technicolor Theories

Savas Dimopoulos
(
- Stanford U., Phys. Dept.
)
,
John R. Ellis
(
- CERN
)

- Nucl.Phys.B 182 (1982) 505-528,
- Also in *Farhi, E. (ed.), Jackiw, R. (ed.): Dynamical Gauge Symmetry Breaking*, 321-344
•
DOI:
- 10.1016/0550-3213(81)90132-2

An Introduction to the Possible Substructure of Quarks and Leptons

Louis Lyons
(
- Oxford U.
)

- Prog.Part.Nucl.Phys. 10 (1983) 227-304,
- In *Wilkinson, D. ( Ed.): Progress In Particle and Nuclear Physics, Vol. 10*, 227-304 and Oxford Univ. - 82-052 (82,REC.SEP.) 174p
•
DOI:
- 10.1016/0146-6410(83)90005-4