Heavy quarkonium production in Z decays

被引：18

作者：

Acciarri, M

Achard, P

Adriani, O

Aguilar-Benitez, M

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

Balandras, A

Ball, RC

Banerjee, S

Banicz, K

Barczyk, A

Barillère, R

Barone, L

Bartalini, P

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

Blaising, JJ

Blyth, SC

Bobbink, GJ

Böhm, A

Boldizsar, L

Borgia, B

Bourilkov, D

Bourquin, M

Braccini, S

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 Lab 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] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[9] Louisiana State Univ, Baton Rouge, LA 70803 USA

[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] Northeastern Univ, Boston, MA 02115 USA

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

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

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

[19] MIT, Cambridge, MA 02139 USA

[20] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[21] Univ Florence, I-50125 Florence, Italy

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

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

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

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

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

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

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

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

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

[31] Univ Lyon 1, Inst Phys Nucl, IN2P3, CNRS, F-69622 Villeurbanne, France

[32] CIEMAT, E-28040 Madrid, Spain

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

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

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

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

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

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

[39] CALTECH, Pasadena, CA 91125 USA

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

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

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

[43] Princeton Univ, Princeton, NJ 08544 USA

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

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

[46] Russian Acad Sci, Inst Nucl Phys, St Petersburg, Russia

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

[48] Ist Nazl Fis Nucl, I-84100 Salerno, Italy

[49] Univ Calif San Diego, San Diego, CA 92093 USA

[50] Univ Santiago, Dept Fis Particular Elementales, E-15706 Santiago, Spain

来源：

PHYSICS LETTERS B | 1999年 / 453卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(99)00280-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report measurements of the inclusive production of heavy quarkonium states in Z decays based on the analysis of 3.6 million hadronic events collected by the L3 detector at LEP. The measurement of inclusive J production and an improved 95% confidence level upper limit on gamma production are presented. In addition, two independent measurements of the ratio, f(p), Of prompt J mesons to those from B decay are made using two different isolation cuts to separate prompt J mesons from J mesons produced in the decays of b hadrons. The results are: Br(Z --> J + X) = (3.21 +/- 0.21 (stat.)(-0.28)(+0.19) (sys.)) X 10(-3) Br(Z --> gamma(1S) + X) < 4.4 x 10(-5), f(p) = (7.1 +/- 2.1 (stat.) +/- 1.2 (sys.)(-0.8)(+1.5) (theo.)) X 10(-2). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：94 / 106

页数：13

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