Measurement of the b quark forward backward asymmetry around the Z0 peak using an inclusive tag

The b quark forward-backward asymmetry has been measured using hadronic Z0 decays collected by the OPAL experiment at LEP. Z0 -> bbbar decays were selected using a combination of secondary vertex and lepton tags, and the sign of the b quark charge was determined using an inclusive tag based on jet, vertex and kaon charges. The results, corrected to the quark level, are: A^b_FB = 0.0582 +- 0.0153 +- 0.0012 at sqrt(s) = 89.50 GeV A^b_FB = 0.0977 +- 0.0036 +- 0.0018 at sqrt(s) = 91.26 GeV A^b_FB = 0.1221 +- 0.0123 +- 0.0025 at sqrt(s) = 92.91 GeV where the first error is statistical and the second systematic in each case. Within the framework of the Standard Model, the result is interpreted as a measurement of the effective weak mixing angle for electrons of sin2theta_W^eff,e = 0.23205 +- 0.00068.

Note:

23 pages, 5 figures Report-no: CERN-EP-2002-053

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
bottom: pair production
bottom: decay modes
angular distribution: asymmetry
energy dependence
track data analysis: vertex
particle identification: flavor

References(53)

Figures(0)

Measurement of the heavy quark forward - backward asymmetries and average $B$ mixing using leptons in multi - hadronic events

OPAL

Collaboration

•

G. Alexander

et al.

- Z.Phys.C 70 (1996) 357-370
•
DOI:
- 10.1007/s002880050114

Measurements of the b quark forward - backward asymmetry around the Z0 peak using jet charge and vertex charge

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Z.Phys.C 75 (1997) 385-396
•
DOI:
- 10.1007/s002880050482

Measurement of A**b(FB) using inclusive b hadron decays

ALEPH

Collaboration

•

A. Heister
(
- Aachen, Tech. Hochsch.
)

et al.

- Eur.Phys.J.C 22 (2001) 201-215
•
e-Print:
- hep-ex/0107033
•
DOI:
- 10.1007/s100520100812

Measurement of the forward backward asymmetry in Z --> b anti-b and Z --> c anti-c decays with leptons

ALEPH

Collaboration

•

A. Heister
(
- Aachen, Tech. Hochsch.
)

et al.

- Eur.Phys.J.C 24 (2002) 177-191
•
DOI:
- 10.1007/s100520200950

Measurement of the forward - backward asymmetry of e+ e- ---> Z ---> b anti-b using prompt leptons and a lifetime tag

DELPHI

Collaboration

•

P. Abreu

et al.

- Z.Phys.C 65 (1995) 569-586
•
DOI:
- 10.1007/BF01578667

Measurement of A(FB)(b anti-b) in hadronic Z decays using a jet charge technique

DELPHI

Collaboration

•

P. Abreu

et al.

- Eur.Phys.J.C 9 (1999) 367-381
•
DOI:
- 10.1007/s100520050030

Measurement of the forward backward asymmetry of c and b quarks at the Z pole using reconstructed D mesons

DELPHI

Collaboration

•

P. Abreu

et al.

- Eur.Phys.J.C 10 (1999) 219-237
•
e-Print:
- hep-ex/9903074
•
DOI:
- 10.1007/s100520050584

Measurement of the e+ e- --> b anti-b and e+ e- --> c anti-c forward backward asymmetries at the Z0 resonance

L3

Collaboration

•

O. Adriani
(
- Florence U. and
- INFN, Florence
)

et al.

- Phys.Lett.B 292 (1992) 454-462
•
DOI:
- 10.1016/0370-2693(92)91203-L

Measurement of the e+ e- --> Z ---> b anti-b forward - backward asymmetry and the B0 anti-B0 mixing parameter using prompt leptons

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 448 (1999) 152-162
•
DOI:
- 10.1016/S0370-2693(98)01601-3

A Measurement of R(b) using a double tagging method

OPAL

Collaboration

•

G. Abbiendi

et al.

- Eur.Phys.J.C 8 (1999) 217-239
•
e-Print:
- hep-ex/9810002
•
DOI:
- 10.1007/s100529901087

Investigation of CP violation in $B^0 \to J/\psi K^0_{S}$ decays at LEP

OPAL

Collaboration

•

K. Ackerstaff

et al.

- Eur.Phys.J.C 5 (1998) 379-388
•
e-Print:
- hep-ex/9801022
•
DOI:
- 10.1007/s100520050284

Measurement of the $B^{+}$ and $B^0$ lifetimes and search for CP( $T$ ) violation using reconstructed secondary vertices

OPAL

Collaboration

•

G. Abbiendi

et al.

- Eur.Phys.J.C 12 (2000) 609-626
•
e-Print:
- hep-ex/9901017

Measurement of the $B^0$ lifetime and oscillation frequency using $\bar{B}^0 \to D^{*+} \ell^{-}$ anti-neutrino decays

OPAL

Collaboration

•

G. Abbiendi

et al.

- Phys.Lett.B 493 (2000) 266-280
•
e-Print:
- hep-ex/0010013
•
DOI:
- 10.1016/S0370-2693(00)01145-X

The OPAL detector at LEP

OPAL

Collaboration

•

K. Ahmet

et al.

- Nucl.Instrum.Meth.A 305 (1991) 275-319
•
DOI:
- 10.1016/0168-9002(91)90547-4

The OPAL silicon microvertex detector

OPAL

Collaboration

•

P.P. Allport
(
- Cambridge U.
)

et al.

- Nucl.Instrum.Meth.A 324 (1993) 34-52
•
DOI:
- 10.1016/0168-9002(93)90964-J

The OPAL silicon strip microvertex detector with two coordinate readout

OPAL

Collaboration

•

P.P. Allport
(
- Cambridge U.
)

et al.

- Nucl.Instrum.Meth.A 346 (1994) 476-495
•
DOI:
- 10.1016/0168-9002(94)90583-5

The extended OPAL silicon strip microvertex detector

OPAL

Collaboration

•

S. Anderson
(
- Indiana U.
)

et al.

- Nucl.Instrum.Meth.A 403 (1998) 326-350
•
DOI:
- 10.1016/S0168-9002(97)01093-0

QCD studies using a cone based jet finding algorithm for $e^{+} e^{-}$ collisions at LEP

OPAL

Collaboration

•

R. Akers

et al.

- Z.Phys.C 63 (1994) 197-212
•
DOI:
- 10.1007/BF01411011

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

A Comparison of $b$ and ( $u d s^{)}$ quark jets to gluon jets

OPAL

Collaboration

•

G. Alexander

et al.

- Z.Phys.C 69 (1996) 543-560
•
DOI:
- 10.1007/s002880050059

Scaling Violations in Inclusive e+ e- Annihilation Spectra

- Phys.Rev.D 27 (1983) 105
•
DOI:
- 10.1103/PhysRevD.27.105

The Detector simulation program for the OPAL experiment at LEP

OPAL

Collaboration

•

J. Allison
(
- Manchester U.
)

et al.

- Nucl.Instrum.Meth.A 317 (1992) 47-74
•
DOI:
- 10.1016/0168-9002(92)90593-S

Measurement of gamma (Z0 ---> b anti-b) / gamma (z0 ---> hadrons) using leptons

OPAL

Collaboration

•

P.D. Acton

et al.

- Z.Phys.C 58 (1993) 523-540
•
DOI:
- 10.1007/BF01553012

A Study of $B$ meson oscillations using dilepton events

OPAL

Collaboration

•

R. Akers

et al.

- Z.Phys.C 66 (1995) 555-565,
- Z. Phys. C66 (1995) 555-565, and CERN Geneva - CERN-PPE-95-012 (95/01,rec.Feb.) 27 p. e: CERN ppe95-012
•
DOI:
- 10.1007/BF01579630

A Parametrization of the Properties of Quark Jets

R.D. Field
(
- Caltech
)
,
R.P. Feynman
(
- Caltech
)

- Nucl.Phys.B 136 (1978) 1,
•
DOI:
- 10.1016/0550-3213(78)90015-9

1-25 of 53
1
2
3
25 / page