Determination of the number of light neutrino species from single photon production at LEP

被引：29

作者：

Acciarri, M

Adriani, O

Aguilar-Benitez, M

Ahlen, S

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Ball, RC

Banerjee, S

Banicz, K

Barczyk, A

Barillere, R

Barone, L

Bartalini, P

Baschirotto, A

Basile, M

Battiston, R

Bay, A

Becattini, F

Becker, U

Behner, F

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Bhattacharya, S

Biasini, M

Biland, A

Bilei, GM

Bizzarri, R

Blaising, JJ

Blyth, SC

Bobbink, GJ

Bock, R

Bohm, A

Boldizsar, L

Borgia, B

机构：

[1] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[2] Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany

[3] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[4] NIKHEF H, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[5] Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands

[6] Univ Michigan, Ann Arbor, MI 48109 USA

[7] Lab Annecy Le Vieux Phys Particules, LAPP, IN2P3, CNRS, F-74941 Annecy Le Vieux, France

[8] Johns Hopkins Univ, Baltimore, MD 21218 USA

[9] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[10] Inst High Energy Phys, Beijing 100039, Peoples R China

[11] Humboldt Univ, D-10099 Berlin, Germany

[12] Univ Bologna, I-40126 Bologna, Italy

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

[14] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[15] Boston Univ, Boston, MA 02215 USA

[16] Northeastern Univ, Boston, MA 02115 USA

[17] Inst Atom Phys, R-76900 Bucharest, Romania

[18] Univ Bucharest, R-76900 Bucharest, Romania

[19] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary

[20] MIT, Cambridge, MA 02139 USA

[21] Univ Florence, I-50139 Florence, Italy

[22] INFN, Sez Firenze, I-50139 Florence, Italy

[23] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[24] World Lab, FBLJA Project, CH-1211 Geneva 23, Switzerland

[25] Univ Geneva, CH-1211 Geneva 4, Switzerland

[26] Univ Sci & Technol China, Hefei 230029, Anhui, Peoples R China

[27] SEFT, Res Inst High Energy Phys, SF-00014 Helsinki, Finland

[28] Univ Lausanne, CH-1015 Lausanne, Switzerland

[29] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[30] Univ Lecce, I-73100 Lecce, Italy

[31] Los Alamos Natl Lab, Los Alamos, NM 87544 USA

[32] Univ Claude Bernard, Inst Phys Nucl Lyon, IN2P3, CNRS, F-69622 Villeurbanne, France

[33] CIEMAT, Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain

[34] Inst Theoret & Expt Phys, Moscow 117259, Russia

[35] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[36] Univ Naples Federico II, I-80125 Naples, Italy

[37] Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus

[38] Catholic Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[39] Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands

[40] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[41] CALTECH, Pasadena, CA 91125 USA

[42] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[43] Univ Perugia, I-06100 Perugia, Italy

[44] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[45] Princeton Univ, Princeton, NJ 08544 USA

[46] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[47] Univ Roma La Sapienza, I-00185 Rome, Italy

[48] Inst Phys Nucl, St Petersburg, Russia

[49] Univ Salerno, I-84100 Salerno, Italy

[50] INFN, I-84100 Salerno, Italy

来源：

PHYSICS LETTERS B | 1998年 / 431卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(98)00519-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A determination of the number of light neutrino families performed by measuring the cross section of single photon production in e(+)e(-) collision near the Z resonance is reported. From an integrated luminosity of 100 pb(-1), collected during the years 1991-94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 45 degrees < theta(gamma) < 135 degrees. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles is measured to be Gamma(inv) = 498 +/- 12(stat) +/- 12(sys)MeV. Using the Standard Model couplings of neutrinos to the Z, the number of light neutrino species is determined to be N-v = 2.98 +/- 0.07(stat) +/- 0.07(sys). (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：199 / 208

页数：10

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