Direct observation of longitudinally polarised W± bosons

被引:8
作者
Acciarri, M [1 ]
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
Banerjee, S
Barczyk, A
Barillère, R
Barone, L
Bartalini, P
Basile, M
Battiston, R
Bay, A
Becattini, F
Becker, U
Behner, F
Bellucci, L
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, Sezione 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] IN2P3, CNRS, LAPP, Lab Annecy Le Vieux Phys Particules, 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, IHEP, Beijing 100039, Peoples R China
[11] Humboldt Univ, D-10099 Berlin, Germany
[12] Univ Bologna, I-40126 Bologna, Italy
[13] Ist Nazl Fis Nucl, Sezione 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] Univ Debrecen, ATOMKI, H-4010 Debrecen, Hungary
[21] Ist Nazl Fis Nucl, Sezione Firenze, I-50125 Florence, Italy
[22] Univ Florence, I-50125 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, USTC, Hefei 230029, Anhui, Peoples R China
[27] Res Inst High Energy Phys, SEFT, SF-00014 Helsinki, Finland
[28] Univ Lausanne, CH-1015 Lausanne, Switzerland
[29] Ist Nazl Fis Nucl, Sezione Lecce, I-73100 Lecce, Italy
[30] Univ Lecce, I-73100 Lecce, Italy
[31] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
[32] CIEMAT, Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain
[33] ITEP, Moscow, Russia
[34] Ist Nazl Fis Nucl, 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, Sezione 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, Sezione Roma, I-00185 Rome, Italy
[45] Univ Roma La Sapienza, I-00185 Rome, Italy
[46] 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, La Jolla, CA 92093 USA
[50] Univ Santiago, Dept Fis Particulas Elementales, E-15706 Santiago, Spain
关键词
D O I
10.1016/S0370-2693(99)01489-6
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The three different helicity states of W+/- bosons, produced in the reaction e(+)e(-) --> W+W- --> lvq (q) over bar are studied using leptonic and hadronic W decays at root s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e(-) beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W+/- bosons is measured to be 0.261 +/- 0.016(syst.) +/- 0.016(syst.) in agreement with the expectation from the Standard Model. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:194 / 204
页数:11
相关论文
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