PRODUCTION AND DECAY OF CHARMED MESONS AT THE Z-RESONANCE

被引：53

作者：

DECAMP, D ^{[1
]}

DESCHIZEAUX, B

GOY, C

LEES, JP

MINARD, MN

ALEMANY, R

CRESPO, JM

DELFINO, M

FERNANDEZ, E

GAITAN, V

GARRIDO, L

MIR, LM

PACHECO, A

CATANESI, MG

CREANZA, D

DE PALMA, M

FARILLA, A

IASELLI, G

MAGGI, G

MAGGI, M

NATALI, S

NUZZO, S

QUATTROMINI, M

RANIERI, A

RASO, G

ROMANO, F

RUGGIERI, F

SELVAGGI, G

SILVESTRIS, L

TEMPESTA, P

ZITO, G

GAO, Y

HU, H

HUANG, D

HUANG, X

LIN, J

LOU, J

QIAO, C

RUAN, T

WANG, T

XIE, Y

XU, D

XU, R

ZHANG, J

ZHAO, W

ATWOOD, WB

BAUERDICK, LAT

BIRD, F

BLUCHER, E

BONVICINI, G

机构：

[1] CNRS, IN2P3, LAB PHYS PARTICULES LAPP, F-74019 ANNECY LE VIEUX, FRANCE

[2] UNIV AUTONOMA BARCELONA, LAB FIS ALTA ENERGIES, E-08193 BELLATERRA, BARCELONA, SPAIN

[3] Ist Nazl Fis Nucl, SEZ BARI, I-70126 BARI, ITALY

[4] Ist Nazl Fis Nucl, DIPARTIMENTO FIS UNIV, I-70126 BARI, ITALY

[5] ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA

[6] CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[7] UNIV BLAISE PASCAL, LAB PHYS CORPUSCULAIRE, F-63177 AUBIERE, FRANCE

[8] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK

[9] NUCL RES CTR DEMOKRITOS NRCD, ATHENS, GREECE

[10] ECOLE POLYTECH, CNRS, IN2P3, LAB PHYS NUCL & HAUTES ENERGIES, F-91128 PALAISEAU, FRANCE

[11] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, ENGLAND

[12] UNIV FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY

[13] IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY

[14] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[15] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

[16] IST NAZL FIS NUCL, LNF, I-00044 FRASCATI, ITALY

[17] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND

[18] UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY

[19] IMPERIAL COLL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[20] UNIV INNSBRUCK, INST EXPT PHYS, A-6020 INNSBRUCK, AUSTRIA

[21] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND

[22] UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY

[23] CNRS, IN2P3, FAC SCI LUMINY, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE

[24] WERNER HEISENBERG INST PHYS, MAX PLANCK INST PHYS & ASTROPHYS, W-8000 MUNICH, GERMANY

[25] UNIV PARIS SUD, CNRS, IN2P3, LAB ACCELERATEUR LINEAIRE, F-91405 ORSAY, FRANCE

[26] UNIV PISA, DIPARTIMENTO FIS, INFN, SEZ PISA, I-56010 PISA, ITALY

[27] SCUOLA NORMALE SUPER, I-56010 PISA, ITALY

[28] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND

[29] RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, DIDCOT, OXON OX11 0QX, ENGLAND

[30] CEN SACLAY, DEPT PHYS PARTICULES ELEMENTAIRES, F-91191 GIF SUR YVETTE, FRANCE

[31] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, ENGLAND

[32] UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY

[33] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[34] IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[35] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA

来源：

PHYSICS LETTERS B | 1991年 / 266卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(91)90769-M

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In a sample of 190 000 hadronic Z decays, three signals of charm production are observed: two from the exclusive decays D0 --> K-pi+ and D*+ --> D0-pi+ --> K-pi+pi+ and one in the transverse-momentum distribution of soft hadrons relative to the nearest jet. The features of these signals are in good agreement with expectations based on the standard model and previous measurements of the branching fractions. The number of D* +/- --> K -/+ pi +/- pi +/- per hadronic decay of the Z is measured to be (5.11 +/- 0.34) x 10(-3), and the branching ratio B(D0 --> K-pi+) is (3.62 +/- 0.34 +/- 0.44)%. Charm hadronization has been studied. The average fraction of the beam energy carried by the D* meson is found to be <X(E)>c = 0.504(-0.017)+0.013 +/- 0.008, and implications of the measurements on the pseudoscalar-to-vector production ratio of charmed mesons are discussed.

引用

页码：218 / 230

页数：13

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