PRODUCTION OF CHARMED MESONS IN Z DECAYS

被引:0
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作者
BUSKULIC, D
DEBONIS, I
DECAMP, D
GHEZ, P
GOY, C
LEES, JP
MINARD, MN
PIETRZYK, B
ARIZTIZABAL, F
COMAS, P
CRESPO, JM
EFTHYMIOPOULOS, I
FERNANDEZ, E
FERNANDEZBOSMAN, M
GAITAN, V
GARRIDO, L
MATTISON, T
ORTEU, S
PACHECO, A
PADILLA, C
PASCUAL, A
CREANZA, D
DEPALMA, M
FARILLA, A
IASELLI, G
MAGGI, G
MARINELLI, N
NATALI, S
NUZZO, S
RANIERI, A
RASO, G
ROMANO, F
RUGGIERI, F
SELVAGGI, G
SILVESTRIS, L
TEMPESTA, P
ZITO, G
CHAI, Y
HU, H
HUANG, D
HUANG, X
LIN, J
WANG, T
XIE, Y
XU, D
XU, R
ZHANG, J
ZHANG, L
ZHAO, W
BONVICINI, G
机构
[1] UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN
[2] INFN, DIPARTIMENTO FIS, SEZ BARI, I-70126 BARI, ITALY
[3] CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA
[4] CERN, EUROPEAN PARTICLE PHYS LAB, CH-1211 GENEVA 23, SWITZERLAND
[5] UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, CNRS, IN2P3, F-63177 CLERMONT FERRAND, FRANCE
[6] NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK
[7] DEMOCRITOS NUCL RES CTR, ATHENS, GREECE
[8] ECOLE POLYTECH, PHYS NUCL & HAUTES ENERGIES LAB, CNRS, IN2P3, F-91128 PALAISEAU, FRANCE
[9] UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND
[10] UNIV FLORENCE, INFN, DIPARTIMENTO FIS, SEZ FIRENZU, I-50125 FLORENCE, ITALY
[11] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA
[12] INFN, NAZL LAB, I-00044 FRASCATI, ITALY
[13] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND
[14] UNIV HEIDELBERG, INST HOCHENER GIEPHYS, D-69120 HEIDELBERG, GERMANY
[15] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND
[16] UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA
[17] UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND
[18] UNIV MAINZ, INST PHYS, D-55099 MAINZ, GERMANY
[19] FAC SCI LUMINY, CTR PHYS PARTICULES, CNRS, IN2P3, F-13288 MARSEILLE 9, FRANCE
[20] MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, D-80805 MUNICH, GERMANY
[21] UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, CNRS, IN2P3, F-91405 ORSAY, FRANCE
[22] UNIV PISA, INFN, DIPARTIMENTO FIS, SEZ PISA, I-56010 PISA, ITALY
[23] UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, LONDON TW2 OEX, SURREY, ENGLAND
[24] RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND
[25] CE SACLAY, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE
[26] UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA
[27] UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND
[28] UNIV SIEGEN, FACHBEREICH PHYS, D-57068 SIEGEN, GERMANY
[29] UNIV TRIESTE, DIPARTIMENTO FIS, INFN, SEZ TRIESTE, I-34127 TRIESTE, ITALY
[30] UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA
[31] UNIV WASHINGTON, SEATTLE, WA 98195 USA
[32] KANGNUNG NATL UNIV, KANGNUNG, SOUTH KOREA
[33] UNIV BARCELONA, DEPT ESTRUCT & CONSTITUENS MAT, E-08208 BARCELONA, SPAIN
来源
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1994年 / 62卷 / 01期
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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
The production of charmed mesons D0(-), D+/-, and D*+/- is studied in a sample of 478,000 hadronic Z decays. The production rates are measured to be GAMMA(Z --> D*+/- X)/GAMMA(had) = 0.187 +/- 0.015 (exp.) +/- 0.013 (BR), GAMMA(Z --> D+/- X) = 0.251 +/- 0.026 (exp.) +/- 0.025 (BR), GAMMA(Z --> D0(-) X)/GAMMA(had) = 0.518 +/- 0.052 (exp.) +/- 0.035 (BR), where the errors from this analysis are separated from those coming from the D branching ratios (BR). The D *+/momentum distribution is extracted separately for Z --> cc and Z --> bbBAR events with the help of event shape variables. It is consistent with the prediction of the JETSET Monte Carlo program after adjustment of the charm fragmentation function. Constraining the shape of the Z --> bbBAR contribution, the average fraction of the beam energy taken by a D* meson produced in the fragmentation of a charm quark is extracted by a parametric fit to be [X(E)]c = 0.495 +/- 0.011 +/- 0.007. Evidence for D**0 (D1(2420)0 and/or D2*(2460)0) production is found in the D*+/-pi-/+ channel, accounting for a fraction (18 +/- 5 +/- 2)% of all D*+/- production. The relative production of vector and pseudoscalar mesons is dicussed, together with the possible effects of D** production. The c-quark forward-backward Z-pole asymmetry is determined from that of high momentum D*+/- to be A(FB)0,c = (7.7 +/- 4.4)%.
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页码:1 / 14
页数:14
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