Charged particle multiplicity in e+e-→q(q)over-bar events at 161 and 172 GeV and from the decay of the W boson

被引：32

作者：

Abreu, P

Adam, W

Adye, T

Ajinenko, I

Alekseev, GD

Alemany, R

Allport, PP

Almehed, S

Amaldi, U

Amato, S

Andersson, P

Andreazza, A

Antilogus, P

Apel, WD

Arnoud, Y

Asman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbi, M

Bardin, DY

Barker, G

Baroncelli, A

Barring, O

Bates, MJ

Battaglia, M

Baubillier, M

Baudot, J

Becks, KH

Begalli, M

Beilliere, P

Belokopytov, Y

Belous, K

Benvenuti, AC

Berat, C

Berggren, M

Bertini, D

Bertrand, D

Besancon, M

Bianchi, F

Bigi, M

Bilenky, MS

Billoir, P

Bizouard, MA

Bloch, D

Blume, M

Bonesini, M

Bonivento, W

机构：

[1] Inst Super Tecn, LIP, FCUL, P-1000 Lisbon, Portugal

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Univ Instelling Antwerp, Dept Phys, B-2610 Antwerp, Belgium

[4] Free Univ Brussels, IIHE, B-1050 Brussels, Belgium

[5] Univ Mons, Fac Sci, B-7000 Mons, Belgium

[6] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[7] Univ Bergen, Dept Phys, N-5007 Bergen, Norway

[8] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[9] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[10] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[11] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[12] Univ Estado Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil

[13] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia

[14] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, F-75231 Paris 05, France

[15] CERN, CH-1211 Geneva 23, Switzerland

[16] ULP, Inst Rech Subatom, IN2P3, CNRS, F-67037 Strasbourg, France

[17] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[18] CAS, FZU, Inst Phys, Div High Energy Phys, Prague 18040 8, Czech Republic

[19] Univ Geneva, Dipartimento Fis, I-16146 Genoa, Italy

[20] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[21] Univ Grenoble 1, Inst Sci Nucl, IN2P3, CNRS, F-38026 Grenoble, France

[22] Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[23] Joint Inst Nucl Res Dubna, Moscow 101000, Russia

[24] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[25] Inst Nucl Phys, PL-30055 Krakow, Poland

[26] Univ Min & Met Krakow, PL-30055 Krakow, Poland

[27] Univ Paris 11, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91405 Orsay, France

[28] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[29] Inst Super Tecn, LIP, FCUL, P-1000 Lisbon, Portugal

[30] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[31] Univ Paris 06, LPNHE, IN2P3, CNRS, F-75252 Paris 05, France

[32] Univ Paris 07, F-75252 Paris 05, France

[33] Lund Univ, Dept Phys, S-22363 Lund, Sweden

[34] Univ Lyon 1, IPNL, IN2P3, CNRS, F-69622 Villeurbanne, France

[35] Univ Aix Marseille 2, CPP, IN2P3, CNRS, F-13288 Marseille 09, France

[36] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[37] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[38] Niels Bohr Inst, DK-2100 Copenhagen 0, Denmark

[39] Charles Univ Prague, MFF, Nucl Ctr, CR-18000 Prague 8, Czech Republic

[40] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[41] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[42] Univ Oslo, Dept Phys, N-1000 Oslo 3, Norway

[43] Univ Oviedo, Dept Fis, Oviedo 33007, Spain

[44] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[45] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[46] Ist Nazl Fis Nucl, I-35131 Padua, Italy

[47] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[48] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[49] Ist Nazl Fis Nucl, I-00173 Rome, Italy

[50] CE Saclay, CEA, DAPNIA, Serv Phys Particules, F-91191 Gif Sur Yvette, France

来源：

PHYSICS LETTERS B | 1998年 / 416卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(97)01248-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The data collected by DELPHI in 1996 have been used to measure the average charged particle multiplicities and dispersions in q (q) over bar events at centre-of-mass energies of root s = 161 GeV and root s = 172 GeV, and the average charge multiplicity in WW events at root s = 172 GeV. The multiplicities in q (q) over bar events are consistent with the evolution predicted by QCD. The dispersions in the multiplicity distributions are consistent with Koba-Nielsen-Olesen (KNO) scaling. The average multiplicity of charged particles in hadronic W decays has been measured for the first time; its value, 19.23 +/- 0.74(stat + syst), is consistent with that expected for an e(+)e(-) interaction at a centre-of-mass energy equal to the W mass. The charged particle multiplicity in W decays shows no evidence of effects of colour reconnection between partons from different W's at the present level of statistics. (C) 1998 Elsevier Science B.V.

引用

页码：233 / 246

页数：14

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