Measurement of the W-pair cross-section and of the W mass in e+e- interactions at 172 GeV

被引：63

作者：

Abreu, P

Adam, W

Adye, T

Adzic, P

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

Barbiellier, M

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

Boonekamp, M

Booth, PSL

Borgland, AW

Borisov, G

Bosio, C

Botner, O

Boudinov, E

机构：

[1] FCUL, IST, LIP, PT-1000 Lisboa, Portugal

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

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

[4] VUB, IIHE, BE-1050 Brussels, Belgium

[5] Univ Etat Mons, Fac Sci, BE-7000 Mons, Belgium

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

[7] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway

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

[9] INFN, 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 Estadual 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] Univ Strasbourg 1, CNRS, IN2P3, Inst Rech Subatom, F-67037 Strasbourg, France

[17] Natl Ctr Sci Res Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[18] Acad Sci Czech Republ, Inst Phys, Div High Energy Phys, FZU, CZ-18040 Prague 8, Czech Republic

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

[20] INFN, I-16146 Genoa, Italy

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

[22] HIP, FI-00014 Helsinki, Finland

[23] Joint Nucl Res Inst, RU-101000 Moscow, Russia

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

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

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

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

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

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

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

[31] Univ Paris 07, CNRS, LPNHE, IN2P3, F-75252 Paris 05, France

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

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

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

[35] INFN, I-20133 Milan, Italy

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

[37] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[38] Charles Univ, NC, Nucl Ctr, MFF, CZ-18000 Praha 8, Czech Republic

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

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

[41] Univ Oslo, Dept Phys, NO-1000 Oslo 3, Norway

[42] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain

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

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

[45] INFN, I-35131 Padua, Italy

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

[47] Univ Rome 2, Dipartimento Fis, I-00173 Rome, Italy

[48] INFN, I-00173 Rome, Italy

[49] CEA, Serv Phys Particules, DAPNIA, F-91191 Gif Sur Yvette, France

[50] Ist Nazl Fis Nucl, Ist Super Sanita, I-00161 Rome, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 2卷 / 04期

关键词：

D O I：

10.1007/s100520050163

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：

From a data sample of 9.98 pb(-1) integrated luminosity, collected by DELPHI at a centre-of-mass energy of 172 GeV, 118 events were selected as W-pair candidates. From these, the branching fraction Br(W --> q (q) over bar) was measured to be 0.660(-0.037)(+0.036)(stat.) +/- 0.009(syst.) and the cross-section for the doubly resonant process e(+)e(-) --> W+W- to be 11.58(-1.35)(+1.44)(stat.) +/- 0.32(syst.) pb. The mass of the W boson, obtained from direct reconstruction of the invariant mass of the fermion pairs in the decays WW --> lvq (q) over bar and WW --> q (q) over bar q (q) over bar, was determined to be m(w) = 80.22 +/- 0.41(stat.) +/- 0.04(syst.) +/- 0.05(int.) +/- 0.03(LEP) GeV/c(2), where "int." denotes the uncertainty from interconnection effects like colour reconnection and Bose-Einstein interference. Combined with the W mass obtained from the cross-sections measured by DELPHI at threshold, a value of m(w) = 80.33 +/- 0.30(stat.) +/- 0.05(syst.) +/- 0.03(int.) +/- 0.03(LEP) GeV/c(2) was found.

引用

页码：581 / 595

页数：15

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