A MEASUREMENT OF CHARGED-PARTICLE MULTIPLICITY IN Z(O)-]C(C)OVER-BAR AND Z(O)-]B(B)OVER-BAR EVENTS

被引：34

作者：

AKERS, R

ALEXANDER, G

ALLISON, J

AMETEWEE, K

ANDERSON, KJ

ARCELLI, S

ASAI, S

AXEN, D

AZUELOS, G

BALL, AH

BARBERIO, E

BARLOW, RJ

BARTOLDUS, R

BATLEY, JR

BEAUDOIN, G

BECK, A

BECK, GA

BEESTON, C

BEHNKE, T

BELL, KW

BELLA, G

BENTVELSEN, S

BERLICH, P

BETHKE, S

BIEBEL, O

BLOODWORTH, IJ

BOCK, P

BOSCH, HM

BOUTEMEUR, M

BRAIBANT, S

BRIGHTTHOMAS, P

BROWN, RM

BUIJS, A

BURCKHART, HJ

BURGIN, R

BURGARD, C

CAPDEVIELLE, N

CAPILUPPI, P

CARNEGIE, RK

CARTER, AA

CARTER, JR

CHANG, CY

CHARLESWORTH, C

CHARLTON, DG

CHU, SL

CLARKE, PEL

CLAYTON, JC

CLOWES, SG

COHEN, I

CONBOY, JE

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

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

[5] CAVENDISH LAB, CAMBRIDGE CB3 0HE, ENGLAND

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

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

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

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

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

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

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

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

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

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

[16] UCL, LONDON WC1E 6BT, ENGLAND

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

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

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

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

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

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

[23] TEL AVIV UNIV, DEPT PHYS & ASTRON, IL-69978 TEL AVIV, ISRAEL

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

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

[26] INT CTR ELEMENTARY PARTICLE 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, DESY, INST EXPTL PHYS 2, 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] TRIUMF, VANCOUVER, BC V6T 2A3, CANADA

来源：

PHYSICS LETTERS B | 1995年 / 352卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(95)00510-R

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have used data from the OPAL detector at LEP to reconstruct D* mesons and secondary vertices in jets. We have studied the hemispheres of the events opposite these jets and obtain values of the hemisphere charged particle multiplicity in Z(0) --> u ($) over bar u, d ($) over bar d, s ($) over bar s, Z(0) --> c ($) over bar c and Z(0) --> b ($) over bar b events of ($) over bar n(uds) = 10.41 +/- 0.06 +/- 0.09 +/- 0.19; ($) over bar n(c) = 10.76 +/- 0.20 +/- 0.14 +/- 0.19; ($) over bar n(b) = 11.81 +/- 0.01 +/- 0.12 +/- 0.21 where the first errors are statistical, the second systematic and the third a common scale uncertainty. We find the difference in total charged particle multiplicity between c and b quark events and light (u, d, s) quark events to be delta(cl) = 0.69 +/- 0.51 +/- 0.35; delta(bl) = 2.79 +/- 0.12 +/- 0.27. These results are compared to the predictions of various models and QCD based calculations.

引用

页码：176 / 186

页数：11

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