Search for γγ → ηb in e+e- collisions at LEP 2

被引：48

作者：

Heister, A

Schael, S

Barate, R

Brunelière, R

De Bonis, I

Decamp, D

Goy, C

Jezequel, S

Lees, JP

Martin, F

Merle, E

Minard, MN

Pietrzyk, B

Trocmé, B

Boix, G

Bravo, S

Casado, MP

Chmeissani, M

Crespo, JM

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Graugés, E

Lopez, J

Martinez, M

Merino, G

Miquel, R

Mir, LM

Pacheco, A

Paneque, D

Ruiz, H

Colaleo, A

Creanza, D

De Filippis, N

de Palma, M

Iaselli, G

Maggi, G

Maggi, M

Nuzzo, S

Ranieri, A

Raso, G

Ruggieri, F

Selvaggi, G

Silvestris, L

Tempesta, P

Tricomi, A

Zito, G

Huang, X

Lin, J

Ouyang, Q

机构：

[1] CNRS, IN2P3, LAPP, F-74019 Annecy Le Vieux, France

[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Bellaterra, Barcelona, Spain

[3] Ist Nazl Fis Nucl, Sez Bari, Dipartimento Fis, I-70126 Bari, Italy

[4] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China

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

[6] Univ Clermont Ferrand, Phys Corpusculaire Lab, CNRS, IN2P3, F-63177 Aubiere, France

[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[8] NRCD, GR-15310 Athens, Greece

[9] Ecole Polytech, CNRS, IN2P3, Phys Theor & Hautes Energies Lab, F-91128 Palaiseau, France

[10] Univ Florence, Ist Nazl Fis Nucl, Sez Firenze, Dipartimento Fis, I-50125 Florence, Italy

[11] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[12] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[13] Haverford Coll, Dept Phys, Haverford, PA 19041 USA

[14] Univ Heidelberg, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany

[15] Univ London Imperial Coll Sci & Technol, Dept Phys, London SW7 2BZ, England

[16] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria

[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

[18] Catholic Univ Louvain, Dept Phys, Inst Nucl Phys, B-1348 Louvain, Belgium

[19] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[20] Univ Aix Marseille 2, Ctr Phys Particules Marseille, F-13288 Marseille, France

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

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

[23] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[24] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, F-91898 Orsay, France

[25] Univ Pisa, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Pisa, I-56010 Pisa, Italy

[26] Scuola Normale Super Pisa, I-56010 Pisa, Italy

[27] Univ London Royal Holloway & Bedford New Coll, Dept Phys, Egham TW20 0EX, Surrey, England

[28] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England

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

[30] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA

[31] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

[32] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[33] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[34] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[35] Univ Washington, Seattle, WA 98195 USA

[36] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[37] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland

[38] Dipartimento Fis, I-95129 Catania, Italy

[39] Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy

[40] CNR, Ist Cosmo Geofis, I-10126 Turin, Italy

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

[42] Univ Barcelona, Barcelona 08208, Spain

[43] Univ Palermo, Dipartimento Fis & Tecnol Relat, Palermo, Italy

[44] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[45] Univ Montpellier 2, Grp Astroparticules Montpellier, F-34095 Montpellier, France

来源：

PHYSICS LETTERS B | 2002年 / 530卷 / 1-4期

关键词：

D O I：

10.1016/S0370-2693(02)01329-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for the pseudoscalar meson eta(b) is performed in two-photon interactions at LEP 2 with an integrated luminosity of 699 pb(-1) collected at e(+)e(-) centre-of-mass energies from 181 GeV to 209 GeV. One candidate event is found in the six-charged-particle final state and none in the four-charged-particle final state, in agreement with the total expected background of about one event. Upper limits of Gamma(gammagamma)(eta(b)) x BR(eta(b) --> 4 charged particles) < 48 eV, Gamma(gammagamma) (eta(b)) x BR(eta(b) --> 6 charged particles) < 132 eV are obtained at 95% confidence level, which correspond to upper limits of 9.0% and 25% on these branching ratios. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：56 / 66

页数：11

共 32 条

[1] Formation of the ηc in two-photon collisions at LEP [J].

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 ;

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 ;

Branson, JG .

PHYSICS LETTERS B, 1999, 461 (1-2) :155-166

[2] 2-PHOTON WIDTH OF SINGLET POSITRONIUM AND QUARKONIUM WITH ARBITRARY TOTAL ANGULAR-MOMENTUM [J].

ACKLEH, ES ;

BARNES, T .

PHYSICAL REVIEW D, 1992, 45 (01) :232-240

[3] Complete O(v(2)) corrections to the static interquark potential from SU(3) gauge theory [J].

Bali, GS ;

Schilling, K ;

Wachter, A .

PHYSICAL REVIEW D, 1997, 56 (05) :2566-2589

[4] QCD forces and heavy quark bound states [J].

Bali, GS .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 343 (1-2) :1-136

[5]

BARNES T, HEPPH0103142

[6]

BARNES T, COMMUNICATION

[7]

BOHRER A, 2001, IN PRESS P PHOTON 20

[8] Quarkonium spectroscopy and perturbative QCD: a new perspective [J].

Brambilla, N ;

Sumino, Y ;

Vairo, A .

PHYSICS LETTERS B, 2001, 513 (3-4) :381-390

[9]

BRAMBILLA N, COMMUNICATION

[10] Measurements of the mass, total width, and two-photon partial width of the ηc meson [J].

Brandenburg, G ;

Ershov, A ;

Gao, YS ;

Kim, DYJ ;

Wilson, R ;

Browder, TE ;

Li, Y ;

Rodriguez, JL ;

Yamamoto, H ;

Bergfeld, T ;

Eisenstein, BI ;

Ernst, J ;

Gladding, GE ;

Gollin, GD ;

Hans, RM ;

Johnson, E ;

Karliner, I ;

Marsh, MA ;

Palmer, M ;

Plager, C ;

Sedlack, C ;

Selen, M ;

Thaler, JJ ;

Williams, J ;

Edwards, KW ;

Janicek, R ;

Patel, PM ;

Sadoff, AJ ;

Ammar, R ;

Bean, A ;

Besson, D ;

Davis, R ;

Kwak, N ;

Zhao, X ;

Anderson, S ;

Frolov, VV ;

Kubota, Y ;

Lee, SJ ;

Mahapatra, R ;

O'Neill, JJ ;

Poling, R ;

Riehle, T ;

Smith, A ;

Stepaniak, CJ ;

Urheim, J ;

Ahmed, S ;

Alam, MS ;

Athar, SB ;

Jian, L ;

Ling, L .

PHYSICAL REVIEW LETTERS, 2000, 85 (15) :3095-3099

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