Observation of B0 - anti-B0 Mixing

Using the ARGUS detector at the DORIS II storage ring we have searched in three different ways for B 0 - B 0 mixing in ϒ (4S) decays. One explicitly mixed event, a decay ϒ (4S)→B 0 B 0 , has been completely reconstructed. Furthermore, we observe a 4.0 standard deviation signal of 24.8 events with like-sign lepton pairs and a 3.0 standard deviation signal of 4.1 events containing one reconstructed B 0 ( B 0 ) and an additional fast ℓ + (ℓ) − . This leads to the conclusion that B 0 - B 0 mixing is substantial. For the mixing parameter we obtain r =0.21±0.08.

electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
Upsilon(10570): hadronic decay
B0: pair production
B0: semileptonic decay
B0: nonleptonic decay
B0: branching ratio
B0 anti-B0: mixing
mass spectrum: recoil

References(30)

Figures(0)

On Effects of D0 anti-D0 Mixing at SPEAR

R.L. Kingsley
(
- Rutherford
)

- Phys.Lett.B 63 (1976) 329-330,
- Physics Letters B63 (1976) 329-330 and Chilton Rutherford Lab - RL-76-065 (76,REC.JUL) 6p
•
DOI:
- 10.1016/0370-2693(76)90275-6

Limits on B0 anti-B0 Mixing and tau (B0) / tau (b+)

CLEO

Collaboration

•

A. Bean
(
- Carnegie Mellon U.
)

et al.

- Phys.Rev.Lett. 58 (1987) 183
•
DOI:
- 10.1103/PhysRevLett.58.183

On the Weak Decays of High Mass Hadrons

John R. Ellis
(
- CERN
)
,
M.K. Gaillard
(
- CERN and
- Orsay, LPT
)
,
Dimitri V. Nanopoulos
(
- CERN
)

- Nucl.Phys.B 100 (1975) 313,
- Nucl.Phys.B 104 (1976) 547 (erratum),
- Nucl.Phys.B104 (1976) 547.(Nucl.Phys.B100 (1975) 313-328)
•
DOI:
- 10.1016/0550-3213(76)90118-8

CP Violation in the Renormalizable Theory of Weak Interaction

Makoto Kobayashi
(
- Kyoto U.
)
,
Toshihide Maskawa
(
- Kyoto U.
)

- Prog.Theor.Phys. 49 (1973) 652-657,
- Also in *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 218-223.
•
DOI:
- 10.1143/PTP.49.652

Rare Decay Modes of the K-Mesons in Gauge Theories

M.K. Gaillard
(
- Fermilab
)
,
Benjamin W. Lee
(
- Fermilab
)

- Phys.Rev.D 10 (1974) 897,
- In *Lichtenberg, D. B. ( Ed.), Rosen, S. P. ( Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 296-315.
•
DOI:
- 10.1103/PhysRevD.10.897

The Phenomenology of the Next Left-Handed Quarks

- Nucl.Phys.B 131 (1977) 285,
- Nucl.Phys.B 132 (1978) 541 (erratum)
•
DOI:
- 10.1016/0550-3213(77)90374-1

Weak Mixing and CP Violation Involving Heavy Quarks and Possible Measurements in e+ e- Experiments

Ahmed Ali
(
- Hamburg U.
)
,
Z.Z. Aydin
(
- Hamburg U.
)

- Nucl.Phys.B 148 (1979) 165-188
•
DOI:
- 10.1016/0550-3213(79)90021-X

Reexamination of the Standard Model in the Light of B Meson Mixing

- Phys.Lett.B 192 (1987) 201-206
•
DOI:
- 10.1016/0370-2693(87)91168-3

From a New Smell to a New Flavor: B (d) anti-B (d) Mixing, CP Violation and New Physics

Ikaros I.Y. Bigi
(
- SLAC
)
,
A.I. Sanda
(
- Rockefeller U.
)

- Phys.Lett.B 194 (1987) 307-311
•
DOI:
- 10.1016/0370-2693(87)90548-X

On B0 anti-B0 Mixing and Violations of CP Symmetry

Ikaros I.Y. Bigi
(
- Fermilab and
- Aachen, Tech. Hochsch.
)
,
A.I. Sanda
(
- Rockefeller U.
)

- Phys.Rev.D 29 (1984) 1393,
- Phys. Rev. D29 ( 1984) 1393-1398 and Fermilab Batavia - FERMILAB-PUB-83-074-THY (83,REC.SEP.) 20 P. (311105)
•
DOI:
- 10.1103/PhysRevD.29.1393