Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

被引：42

作者：

Alexander, G

Allison, J

Altekamp, N

Ametewee, K

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Beaudoin, G

Bechtluft, J

Beck, GA

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Berlich, P

Bethke, S

Biebel, O

Bloodworth, IJ

Bloomer, JE

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

BrightThomas, P

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlesworth, C

Charlton, DG

Chrisman, D

Chu, SL

Clarke, PEL

Clowes, SG

机构：

[1] UNIV BIRMINGHAM, SCH PHYS & SPACE RES, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND

[2] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40126 BOLOGNA, ITALY

[3] IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY

[4] UNIV BONN, INST PHYS, D-53115 BONN, GERMANY

[5] UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA

[6] UNIV CAMBRIDGE, CAVENDISH LAB, CAMBRIDGE CB3 0HE, ENGLAND

[7] CARLETON UNIV, OTTAWA CARLETON INST PHYS, DEPT PHYS, OTTAWA, ON K1S 5B6, CANADA

[8] CARLETON UNIV, CTR RES PARTICLE PHYS, OTTAWA, ON K1S 5B6, CANADA

[9] CERN, EUROPEAN ORG PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[10] UNIV CHICAGO, ENRICO FERMI INST, CHICAGO, IL 60637 USA

[11] UNIV CHICAGO, DEPT PHYS, CHICAGO, IL 60637 USA

[12] UNIV FREIBURG, FAK PHYS, D-79104 FREIBURG, GERMANY

[13] UNIV HEIDELBERG, INST PHYS, D-69120 HEIDELBERG, GERMANY

[14] INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA

[15] UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND

[16] RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY

[17] UNIV LONDON UNIV COLL, LONDON WC1E 6BT, ENGLAND

[18] UNIV MANCHESTER, SCHUSTER LAB, DEPT PHYS, MANCHESTER M13 9PL, LANCS, ENGLAND

[19] UNIV MARYLAND, DEPT PHYS, COLLEGE PK, MD 20742 USA

[20] UNIV MONTREAL, PHYS NUCL LAB, MONTREAL, PQ H3C 3J7, CANADA

[21] UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA

[22] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[23] CENS, CEA, SPP, DAPNIA, F-91191 GIF SUR YVETTE, FRANCE

[24] TECHNION ISRAEL INST TECHNOL, DEPT PHYS, IL-32000 HAIFA, ISRAEL

[25] UNIV TOKYO, INT CTR ELEMENTARY PARTICLE PHYS, TOKYO 113, JAPAN

[26] UNIV TOKYO, DEPT PHYS, TOKYO 113, JAPAN

[27] KOBE UNIV, KOBE 657, JAPAN

[28] BRUNEL UNIV, UXBRIDGE UB8 3PH, MIDDX, ENGLAND

[29] WEIZMANN INST SCI, DEPT PARTICLE PHYS, IL-76100 REHOVOT, ISRAEL

[30] UNIV HAMBURG, INST EXPTL PHYS 2, DESY, D-22607 HAMBURG, GERMANY

[31] UNIV VICTORIA, DEPT PHYS, VICTORIA, BC V8W 3P6, CANADA

[32] UNIV BRITISH COLUMBIA, DEPT PHYS, VANCOUVER, BC V6T 1Z1, CANADA

[33] UNIV ALBERTA, DEPT PHYS, EDMONTON, AB T6G 2J1, CANADA

[34] DUKE UNIV, DEPT PHYS, DURHAM, NC 27708 USA

[35] RES INST PARTICLE & NUCL PHYS, H-1525 BUDAPEST, HUNGARY

[36] INST NUCL RES, H-4001 DEBRECEN, HUNGARY

[37] TRIUMF, VANCOUVER, BC V6T 2A3, CANADA

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1996年 / 70卷 / 03期

关键词：

D O I：

10.1007/s002880050114

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A measurement of the forward-backward asymmetries of e(+)e(-) --> Z(0) --> <b(b)over bar> and e(+)e(-) --> Z(0) --> <c(c)over bar> using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B-0-B-0 mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: A(FB)(b) = (5.5 +/- 2.4 +/- 0.3)% A(FB)(c) = (-7.5 +/- 3.4 +/- 0.6)% at [root s] = 89.52 GeV, A(FB)(b) = (9.06 +/- 0.51 +/- 0.23)% A(FB)(c) = (6.00 +/- 0.67 +/- 0.52)% at [root s] = 91.24 GeV, A(FB)(b) = (11.7 +/- 2.0 +/- 0.3)% A(FB)(c) = (14.1 +/- 2.8 +/- 0.9)% at [root s] = 92.94 GeV. For the average B-0-(B-0) over bar mixing a value of: <(chi)over bar) = 0.1107 +/- 0.0062 +/- 0.0055, is obtained, where in each case the first error is statistical and the second systematic.

引用

页码：357 / 369

页数：13

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