Direct measurement of A(b) and A(c) at the Z0 pole using a lepton tag

The parity violation parameters Ab and Ac of the Zbb¯ and Zcc¯ couplings have been measured directly, using the polar angle dependence of the Z0-pole polarized cross sections. Bottom and charmed hadrons were tagged via semileptonic decays. Both the muon and electron identification algorithms take advantage of new multivariate techniques, incorporating for the first time information from the SLD Čerenkov Ring Imaging Detector. Based on the 1993–1995 SLD sample of 150 000 Z0 decays produced with highly polarized electron beams, we measure Ab=0.910±0.068(stat)±0.037(syst), Ac=0.642±0.110(stat)±0.063(syst).

electron positron: colliding beams
electron positron: annihilation
electron: polarized beam
Z0: electroproduction
Z0: hadronic decay
charm
bottom
quark: pair production
quark: semileptonic decay
angular distribution: asymmetry

References(23)

Figures(0)

A Direct measurement of parity violation in the coupling of Z0 bosons to b quarks using a mass tag and momentum weighted track charge

SLD

Collaboration

•

K. Abe
(
- Aomori U.
)

et al.

- Phys.Rev.Lett. 81 (1998) 942-946
•
DOI:
- 10.1103/PhysRevLett.81.942

Measurement of A(b) and A(c) from the left-right forward - backward asymmetry of leptons in hadronic events at the Z0 resonance

SLD

Collaboration

•

K. Abe

et al.

- Phys.Rev.Lett. 74 (1995) 2895-2899
•
DOI:
- 10.1103/PhysRevLett.74.2895

An improved measurement of the left-right $Z^0$ cross-section asymmetry

SLD

Collaboration

•

K. Abe

et al.

- Phys.Rev.Lett. 78 (1997) 2075-2079
•
e-Print:
- hep-ex/9611011
•
DOI:
- 10.1103/PhysRevLett.78.2075

Performance of the SLD central drift chamber

et al.

- Nucl.Instrum.Meth.A 367 (1995) 111-114
•
DOI:
- 10.1016/0168-9002(95)00732-6

The Lead liquid argon sampling calorimeter of the SLD detector

D. Axen
(
- British Columbia U.
)
,
S. Bougerolle
(
- British Columbia U.
)
,
R. Sobie
(
- British Columbia U.
)
,
G. Eigen
(
- Caltech
)
,
D. Hitlin
(
- Caltech
)

et al.

- Nucl.Instrum.Meth.A 328 (1993) 472-494
•
DOI:
- 10.1016/0168-9002(93)90664-4

The Iron Calorimeter and Muon Identifier for Sld

A.C. Benvenuti
(
- INFN, Bologna
)
,
G. Callegari
(
- INFN, Ferrara and
- Ferrara U.
)
,
L. Piemontese
(
- INFN, Ferrara and
- Ferrara U.
)
,
A. Calcaterra
(
- Frascati
)
,
R. De Sangro
(
- Frascati
)

et al.

- Nucl.Instrum.Meth.A 276 (1989) 94
•
DOI:
- 10.1016/0168-9002(89)90620-7

The Limited Streamer Tubes of the Sld

A.C. Benvenuti
(
- INFN, Bologna
)
,
L. Piemontese
(
- INFN, Ferrara and
- Ferrara U.
)
,
A. Calcaterra
(
- Frascati
)
,
R. De Sangro
(
- Frascati
)
,
P. De Simone
(
- Frascati
)

et al.

- Nucl.Instrum.Meth.A 290 (1990) 353
•
DOI:
- 10.1016/0168-9002(90)90551-G

- Phys.Rev. 59 1999

Experimental Studies on Multi-Jet Production in e+ e- Annihilation at PETRA Energies

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Z.Phys.C 33 (1986) 23,
•
DOI:
- 10.1007/BF01410449

High-energy physics event generation with PYTHIA 5.7 and JETSET 7.4

Torbjorn Sjostrand
(
- CERN
)

- Comput.Phys.Commun. 82 (1994) 74-90,
- CERN Geneva - TH. 7111 (93/12,rec.Jan.94) 17 p. and e: CERN th-7111-93
•
DOI:
- 10.1016/0010-4655(94)90132-5

Semileptonic B and D Decays in the Quark Model

- Phys.Rev.D 39 (1989) 799-818
•
DOI:
- 10.1103/PhysRevD.39.799

Review of particle properties. Particle Data Group

et al.

- Phys.Rev.D 50 (1994) 1173-1823
•
DOI:
- 10.1103/PhysRevD.50.1173

Measurements of the B semileptonic branching fraction with lepton tags

CLEO

Collaboration

•

B. Barish
(
- Caltech
)

et al.

- Phys.Rev.Lett. 76 (1996) 1570-1574
•
DOI:
- 10.1103/PhysRevLett.76.1570

A Phenomenological analysis of heavy hadron lifetimes

Hai-Yang Cheng
(
- Taiwan, Inst. Phys.
)

- Phys.Rev.D 56 (1997) 2783-2798
•
e-Print:
- hep-ph/9704260
•
DOI:
- 10.1103/PhysRevD.56.2783

The Semileptonic Decays of the D Meson

et al.

- Phys.Rev.Lett. 43 (1979) 1073
•
DOI:
- 10.1103/PhysRevLett.43.1073

B Jet Asymmetries in Z Decays

- Z.Phys.C 46 (1990) 411-418
•
DOI:
- 10.1007/BF01621029

- Nucl.Phys.A 391 3

Radiative gluon effects in massive quark anti-quark production in collisions of positrons and polarized electrons at the Z0 resonance

- Phys.Rev.D 52 (1995) 1359-1368,
- Phys. Rev. D52 (1995) 1359-1368, and Trondheim U. - 1994-17 (94/07,rec.Sep.) 24 p
•
DOI:
- 10.1103/PhysRevD.52.1359

Gluon bremsstrahlung from massive quarks in high-energy collisions of polarized electrons and positrons

- Phys.Rev.D 50 (1994) 6775-6782,
- Phys. Rev. D50 (1994) 6775-6782, and Trondheim U. - 1994-02 (94/01,rec.Feb.) 18 p
•
DOI:
- 10.1103/PhysRevD.50.6775

A Measurement of the production of D*+- mesons on the Z0 resonance

OPAL

Collaboration

•

R. Akers

et al.

- Z.Phys.C 67 (1995) 27-44
•
DOI:
- 10.1007/BF01564819

- Z.Phys.B 353 595

Measurement of the multiplicity of gluons splitting to bottom quark pairs in hadronic Z0 decays

DELPHI

Collaboration

•

P. Abreu

et al.

- Phys.Lett.B 405 (1997) 202-214
•
DOI:
- 10.1016/S0370-2693(97)00608-4

Leptonic Decay of Heavy Flavors: A Theoretical Update

Guido Altarelli
(
- Rome U. and
- INFN, Rome
)
,
N. Cabibbo
(
- Rome U. and
- INFN, Rome
)
,
G. Corbo
(
- Rome U. and
- INFN, Rome
)
,
L. Maiani
(
- Rome U. and
- INFN, Rome
)
,
G. Martinelli
(
- Frascati
)

- Nucl.Phys.B 208 (1982) 365-380
•
DOI:
- 10.1016/0550-3213(82)90226-7