MEASUREMENT OF THE CHARGED MULTIPLICITY OF Z(0)-]B(B)OVER-BAR EVENTS

被引：21

作者：

ABE, K

ABT, I

ASH, WW

ASTON, D

BACCHETTA, N

BAIRD, KG

BALTAY, C

BAND, HR

BARAKAT, MB

BARANKO, G

BARDON, O

BATTISTON, R

BAZARKO, AO

BEAN, A

BELCINSKI, RJ

BENDAVID, R

BENVENUTI, AC

BIASINI, M

BIENZ, T

BILEI, GM

BISELLO, D

BLAYLOCK, G

BOGART, JR

BOLTON, T

BOWER, GR

BRAU, JE

BREIDENBACH, M

BUGG, WM

BURKE, D

BURNETT, TH

BURROWS, PN

BUSZA, W

CALCATERRA, A

CALDWELL, DO

CALLOWAY, D

CAMANZI, B

CARPINELLI, M

CARR, J

CASSELL, R

CASTALDI, R

CASTRO, A

CAVALLISFORZA, M

CHADWICK, GB

CHEN, L

CHURCH, E

CLAUS, R

COHN, HO

COLLER, JA

COOK, V

COTTON, R

机构：

[1] ADELPHI UNIV,GARDEN CITY,NY 11530

[2] BOSTON UNIV,BOSTON,MA 02215

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

[4] CALTECH,PASADENA,CA 91125

[5] COLUMBIA UNIV,NEW YORK,NY 10027

[6] IST NAZL FIS NUCL,NAZL FRASCATI LAB,I-00044 FRASCATI,ITALY

[7] UNIV FERRARA,I-44100 FERRARA,ITALY

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

[9] IST NAZL FIS NUCL,I-44100 FERRARA,ITALY

[10] UNIV PADUA,I-35100 PADUA,ITALY

[11] IST NAZL FIS NUCL,I-35100 PADUA,ITALY

[12] IST NAZL FIS NUCL,I-06100 PERUGIA,ITALY

[13] IST NAZL FIS NUCL,I-56100 PISA,ITALY

[14] UNIV PERUGIA,I-06100 PERUGIA,ITALY

[15] UNIV CALIF BERKELEY,BERKELEY,CA 94720

[16] UNIV PISA,I-56100 PISA,ITALY

[17] MIT,CAMBRIDGE,MA 02139

[18] NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN

[19] RUTGERS STATE UNIV,PISCATAWAY,NJ 08855

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

[21] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309

[22] UNIV BRITISH COLUMBIA,VANCOUVER V6T 2A6,BC,CANADA

[23] UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106

[24] UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064

[25] UNIV CINCINNATI,CINCINNATI,OH 45221

[26] UNIV COLORADO,BOULDER,CO 80309

[27] UNIV GENOA,I-16146 GENOA,ITALY

[28] UNIV ILLINOIS,URBANA,IL 61801

[29] UNIV MASSACHUSETTS,AMHERST,MA 01003

[30] UNIV OREGON,EUGENE,OR 97403

[31] UNIV PERUGIA,I-06100 PERUGIA,ITALY

[32] UNIV TENNESSEE,KNOXVILLE,TN 37996

[33] UNIV VICTORIA,VICTORIA V8W 2Y2,BC,CANADA

[34] UNIV WASHINGTON,SEATTLE,WA 98195

[35] UNIV WISCONSIN,MADISON,WI 53706

[36] VANDERBILT UNIV,NASHVILLE,TN 37235

[37] YALE UNIV,NEW HAVEN,CT 06511

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.72.3145

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using an impact parameter tag to select an enriched sample of Z0 --> bbBAR events, we have measured the difference between the average charged multiplicity of Z0 --> bbBAR and Z0 --> hadrons to be n(b)BAR-n(had)BAR=2.24 +/- 0.30(stat) +/- 0.33(syst) tracks per event. From this, we have derived n(b)BAR-n(uds)BAR=3.31 +/- 0.41 +/- 0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that n(b)BAR-n(uds)BAR depends on energy. This result is in agreement with a precise prediction of perturbative QCD, and supports the notion that QCD remains asymptotically free down to the scale M(b)2.

引用

页码：3145 / 3149

页数：5