Determination of the e+e-→γγ(γ) cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV

被引：21

作者：

Abreu, P

Adam, W

Adye, T

Adzic, P

Albrecht, Z

Alderweireld, T

Alekseev, GD

Alemany, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amapane, N

Amato, S

Anassontzis, EG

Andersson, P

Andreazza, A

Andringa, S

Antilogus, P

Apel, WD

Arnoud, Y

Åsman, B

Augustin, JE

Augustinus, A

Baillon, P

Ballestrero, A

Bambade, P

Barao, F

Barbiellini, G

Barbier, R

Bardin, DY

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Behrmann, A

Beilliere, P

Belokopytov, Y

Belous, K

Benekos, NC

Benvenuti, AC

Berat, C

Berggren, M

Berntzon, L

Bertrand, D

Besancon, M

Bilenky, MS

Bizouard, MA

机构：

[1] Univ Milan, Dipartimento Fis, IT-20126 Milan, Italy

[2] Ist Nazl Fis Nucl, IT-20126 Milan, Italy

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

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

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

[6] Univ Etat Mons, Fac Sci, B-7000 Mons, Belgium

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

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

[9] Univ Bologna, Dipartimento Fis, IT-40126 Bologna, Italy

[10] Ist Nazl Fis Nucl, IT-40126 Bologna, Italy

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

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

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

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

[15] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, FR-75231 Paris 05, France

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

[17] ULP, CNRS, IN2P3, Inst Rech Subatom, FR-67037 Strasbourg, France

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

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

[20] Univ Genoa, Dipartimento Fis, IT-16146 Genoa, Italy

[21] Ist Nazl Fis Nucl, IT-16146 Genoa, Italy

[22] Univ Grenoble 1, CNRS, IN2P3, Inst Sci Nucl, FR-38026 Grenoble, France

[23] Helsinki Inst Phys, FI-00014 Helsinki, Finland

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

[25] Univ Karlsruhe, Inst Expt Kernphys, DE-76128 Karlsruhe, Germany

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

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

[28] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, FR-91405 Orsay, France

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

[30] FCUL, IST, LIP, PT-1000 Lisbon, Portugal

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

[32] Univ Paris 06, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France

[33] Univ Paris 07, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France

[34] Lund Univ, Dept Phys, SE-22363 Lund, Sweden

[35] Univ Lyon 1, IPNL, IN2P3, CNRS, FR-69622 Villeurbanne, France

[36] Univ Aix Marseille 2, CPP, IN2P3, CNRS, FR-13288 Marseille 09, France

[37] Univ Milan, Dipartimento Fis, IT-20133 Milan, Italy

[38] Ist Nazl Fis Nucl, IT-20133 Milan, Italy

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

[40] Charles Univ Prague, MFF, IPNP, Areal MFF, CZ-18000 Prague 8, Czech Republic

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

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

[43] Univ Oslo, Dept Phys, NO-1000 Oslo, Norway

[44] Univ Oviedo, Dept Fis, ES-33007 Oviedo, Spain

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

[46] Univ Padua, Dipartimento Fis, IT-35131 Padua, Italy

[47] Ist Nazl Fis Nucl, IT-35131 Padua, Italy

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

[49] Univ Roma Tor Vergata, Dipartimento Fis, IT-00173 Rome, Italy

[50] Ist Nazl Fis Nucl, IT-00173 Rome, Italy

来源：

PHYSICS LETTERS B | 2000年 / 491卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(00)01013-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A test of the QED process e(+)e(-) --> gamma gamma>(*) over bar *(gamma) is reported. The data analysed were collected with the DELPHI detector in 1998 and 1999 at the highest energies achieved at LEP, reaching 202 GeV in the centre-of-mass. The total integrated luminosity amounts to 375.7 pb(-1). The differential and total cross-sections for the process e(+)e(-) --> gamma gamma were measured, and found to be in agreement with the QED prediction. 95% confidence level (C.L.) lower limits on the QED cut-off parameters of Lambda (+) > 330 GeV and Lambda_ > 320 GeV were derived. A 95% C.L. lower bound on the mass of an excited electron of 311 GeV/c(2) (for lambda gamma = 1) was obtained, s-channel virtual graviton exchange was searched for, resulting in 95% C.L. lower limits on the string mass scale, M-S: M-S > 713 GeV/c(2) (lambda = 1) and M-S > 691 GeV/c(2) (lambda = -1). (C) 2000 Published by Elsevier Science B.V.

引用

页码：67 / 80

页数：14

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