Content area
Abstract
From a total data sample of 701.1 pb-1 recorded with e+e- centre-of-mass energies of \(\sqrt{s} =\)161–209 GeV with the OPAL detector at LEP, 11693 W-pair candidate events are selected. These data are used to obtain measurements of the W-pair production cross sections at 10 different centre-of-mass energies. The ratio of the measured cross sections to the standard model expectation is found to be: \({\text{data}}/{{\text{SM}}} = 1.002\pm0.011 ({\text{stat.}}) \pm0.007 ({\text{syst.}}) \pm0.005 ({\text{theory}})\), where the uncertainties are statistical, experimental systematics and theory systematics respectively. The data are used to determine the W boson branching fractions, which are found to be consistent with lepton universality of the charged current interaction. Assuming lepton universality, the branching ratio to hadrons is determined to be 67.41±0.37(stat.)±0.23(syst.)%, from which the CKM matrix element |Vcs| is determined to be 0.969±0.017(stat.)±0.012(syst.). The differential cross section as a function of the W- production angle is measured for the qqeν and qqμν final states. The results described in this paper are consistent with the expectations from the standard model.
Details
Title
Measurement of the e+e-→W+W- cross section and W decay branching fractions at LEP
Author
Abbiendi, G 1 ; Ainsley, C 2 ; Åkesson, P F 3 ; Alexander, G 4 ; Anagnostou, G 5 ; Anderson, K J 6 ; Asai, S 7 ; Axen, D 8 ; Bailey, I 9 ; Barberio, E 10 ; Barillari, T 11 ; Barlow, R J 12 ; Batley, R J 2 ; Bechtle, P 13 ; Behnke, T 13 ; Bell, K W 14 ; Bell, P J 5 ; Bella, G 4 ; Bellerive, A 15 ; Benelli, G 16 ; Bethke, S 11 ; Biebel, O 17 ; Boeriu, O 18 ; Bock, P 19 ; Boutemeur, M 17 ; Braibant, S 1 ; Brown, R M 14 ; Burckhart, HJ 3 ; Campana, S 16 ; Capiluppi, P 1 ; Carnegie, R K 15 ; Carter, A A 20 ; Carter, J R 2 ; Chang, CY 21 ; Charlton, D G 5 ; Ciocca, C 1 ; Csilling, A 22 ; Cuffiani, M 1 ; Dado, S 23 ; Dallavalle, M 1 ; De Roeck, A 3 ; De Wolf, EA 24 ; Desch, K 13 ; Dienes, B 25 ; Dubbert, J 17 ; Duchovni, E 26 ; Duckeck, G 17 ; Duerdoth, I P 12 ; Etzion, E 4 ; Fabbri, F 1 ; Ferrari, P 3 ; Fiedler, F 17 ; Fleck, I 18 ; Ford, M 12 ; Frey, A 3 ; Gagnon, P 27 ; Gary, J W 16 ; Geich-Gimbel, C 28 ; Giacomelli, G 1 ; Giacomelli, P 1 ; Giunta, M 16 ; Goldberg, J 23 ; Gross, E 26 ; Grunhaus, J 4 ; Gruwé, M 3 ; Gupta, A 6 ; Hajdu, C 22 ; Hamann, M 13 ; Hanson, G G 16 ; Harel, A 23 ; Hauschild, M 3 ; Hawkes, C M 5 ; Hawkings, R 3 ; Herten, G 18 ; Heuer, R D 13 ; Hill, J C 2 ; Horváth, D 29 ; Igo-Kemenes, P 19 ; Ishii, K 7 ; Jeremie, H 30 ; Jovanovic, P 5 ; Junk, T R 31 ; Kanzaki, J 32 ; Karlen, D 9 ; Kawagoe, K 7 ; Kawamoto, T 7 ; Keeler, R K 9 ; Kellogg, R G 21 ; Kennedy, B W 14 ; Kluth, S 11 ; Kobayashi, T 7 ; Kobel, M 33 ; Komamiya, S 7 ; Krämer, T 13 ; Krasznahorkay, A, Jr 34 ; Krieger, P 35 ; J von Krogh 19 ; Kuhl, T 13 ; Kupper, M 26 ; Lafferty, G D 12 ; Landsman, H 23 ; Lanske, D 36 ; Lellouch, D 26 ; Letts, J 37 ; Levinson, L 26 ; Lillich, J 18 ; Lloyd, S L 20 ; Loebinger, F K 12 ; J Lu 38 ; Ludwig, A 33 ; Ludwig, J 18 ; Mader, W 33 ; Marcellini, S 1 ; Martin, A J 20 ; Mashimo, T 7 ; Mättig, P 39 ; McKenna, J 8 ; McPherson, R A 9 ; Meijers, F 3 ; Menges, W 13 ; Merritt, F S 6 ; Mes, H 40 ; Meyer, N 13 ; Michelini, A 1 ; Mihara, S 7 ; Mikenberg, G 26 ; Miller, D J 41 ; Mohr, W 18 ; Mori, T 7 ; Mutter, A 18 ; Nagai, K 20 ; Nakamura, I 42 ; Nanjo, H 7 ; HA, Neal 43 ; SW O’Neale 5 ; A Oh 3 ; Oreglia, MJ 6 ; Orito, S 7 ; Pahl, C 11 ; Pásztor, G 44 ; Pater, J R 12 ; Pilcher, JE 6 ; Pinfold, J 45 ; Plane, DE 3 ; Pooth, O 36 ; Przybycień, M 46 ; Quadt, A 11 ; Rabbertz, K 24 ; Rembser, C 3 ; Renkel, P 26 ; Roney, J M 9 ; Rossi, A M 1 ; Rozen, Y 23 ; Runge, K 18 ; Sachs, K 15 ; Saeki, T 7 ; Sarkisyan, EKG 47 ; Schaile, AD 17 ; Schaile, O 17 ; Scharff-Hansen, P 3 ; Schieck, J 11 ; Schörner-Sadenius, T 48 ; Schröder, M 3 ; Schumacher, M 28 ; Seuster, R 49 ; Shears, T G 50 ; Shen, B C 16 ; Sherwood, P 41 ; Skuja, A 21 ; Smith, A M 3 ; Sobie, R 9 ; Söldner-Rembold, S 12 ; Spano, F 51 ; Stahl, A 36 ; Strom, D 52 ; Ströhmer, R 17 ; Tarem, S 23 ; Tasevsky, M 53 ; Teuscher, R 6 ; Thomson, MA 2 ; Torrence, E 52 ; Toya, D 7 ; Trigger, I 54 ; Trócsányi, Z 34 ; Tsur, E 4 ; Turner-Watson, M F 5 ; Ueda, I 7 ; Ujvári, B 34 ; Vollmer, C F 17 ; Vannerem, P 18 ; Vértesi, R 34 ; Verzocchi, M 21 ; Voss, H 24 ; Vossebeld, J 50 ; Ward, C P 2 ; DR Ward 2 ; Watkins, P M 5 ; Watson, A T 5 ; Watson, N K 5 ; Wells, P S 3 ; Wengler, T 3 ; Wermes, N 28 ; Wilson, G W 55 ; Wilson, JA 5 ; Wolf, G 26 ; Wyatt, T R 12 ; Yamashita, S 7 ; Zer-Zion, D 16 ; Zivkovic, L 23
1 Dipartimento di Fisica dell’ Università di Bologna and INFN, Bologna, Italy
2 Cavendish Laboratory, Cambridge, UK
3 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland
4 Department of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
5 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
6 Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, USA
7 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan
8 Department of Physics, University of British Columbia, Vancouver, BC, Canada
9 Department of Physics, University of Victoria, Victoria, BC, Canada
10 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; The University of Melbourne, Victoria, Australia
11 Max-Planck-Institute für Physik, München, Germany
12 School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, Manchester, UK
13 Institut für Experimentalphysik, Universität Hamburg/DESY, Hamburg, Germany
14 Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, UK
15 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada
16 Department of Physics, University of California, Riverside, CA, USA
17 Sektion Physik, Ludwig-Maximilians-Universität München, Garching, Germany
18 Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
19 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
20 Queen Mary and Westfield College, University of London, London, UK
21 Department of Physics, University of Maryland, College Park, MD, USA
22 Research Institute for Particle and Nuclear Physics, Budapest, Hungary
23 Department of Physics, Technion-Israel Institute of Technology, Haifa, Israel
24 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; IPHE Université de Lausanne, Lausanne, Switzerland
25 Institute of Nuclear Research, Debrecen, Hungary
26 Particle Physics Department, Weizmann Institute of Science, Rehovot, Israel
27 Department of Physics, Indiana University, Bloomington, IN, USA
28 Physikalisches Institut, Universität Bonn, Bonn, Germany
29 Research Institute for Particle and Nuclear Physics, Budapest, Hungary; Institute of Nuclear Research, Debrecen, Hungary
30 Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Québec, Canada
31 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; Dept. Physics, University of Illinois at Urbana-Champaign, Urbana-Champaign, USA
32 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan; High Energy Accelerator Research Organisation (KEK), Tsukuba, Ibaraki, Japan
33 Physikalisches Institut, Universität Bonn, Bonn, Germany; Technische Universität, Dresden, Germany
34 Institute of Nuclear Research, Debrecen, Hungary; Department of Experimental Physics, University of Debrecen, Debrecen, Hungary
35 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; Dept of Physics, University of Toronto, Toronto, Canada
36 III Physikalisches Institut, Technische Hochschule Aachen, Aachen, Germany
37 University of California, San Diego, USA
38 Department of Physics, University of British Columbia, Vancouver, BC, Canada; University of Alberta, Alberta, Canada
39 Bergische Universität, Wuppertal, Germany
40 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; TRIUMF, Vancouver, Canada
41 University College London, London, UK
42 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan; University of Pennsylvania, Philadelphia, Pennsylvania, USA
43 Department of Physics, Yale University, New Haven , CT, USA
44 Department of Physics, University of California, Riverside, CA, USA; Research Institute for Particle and Nuclear Physics, Budapest, Hungary
45 Department of Physics, University of Alberta, Edmonton, AB, Canada
46 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; University of Mining and Metallurgy, Cracow, Poland
47 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; University of Antwerpen, Antwerpen, Belgium
48 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; DESY, Hamburg, Germany
49 III Physikalisches Institut, Technische Hochschule Aachen, Aachen, Germany; MPI München, München, Germany
50 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; Dept of Physics, University of Liverpool, Liverpool, UK
51 Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, USA; Columbia University, New York, USA
52 Department of Physics, University of Oregon, Eugene, OR, USA
53 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
54 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; TRIUMF, Vancouver, Canada
55 School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, Manchester, UK; Dept of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
1 Dipartimento di Fisica dell’ Università di Bologna and INFN, Bologna, Italy
2 Cavendish Laboratory, Cambridge, UK
3 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland
4 Department of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
5 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
6 Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, USA
7 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan
8 Department of Physics, University of British Columbia, Vancouver, BC, Canada
9 Department of Physics, University of Victoria, Victoria, BC, Canada
10 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; The University of Melbourne, Victoria, Australia
11 Max-Planck-Institute für Physik, München, Germany
12 School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, Manchester, UK
13 Institut für Experimentalphysik, Universität Hamburg/DESY, Hamburg, Germany
14 Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, UK
15 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada
16 Department of Physics, University of California, Riverside, CA, USA
17 Sektion Physik, Ludwig-Maximilians-Universität München, Garching, Germany
18 Fakultät für Physik, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
19 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
20 Queen Mary and Westfield College, University of London, London, UK
21 Department of Physics, University of Maryland, College Park, MD, USA
22 Research Institute for Particle and Nuclear Physics, Budapest, Hungary
23 Department of Physics, Technion-Israel Institute of Technology, Haifa, Israel
24 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; IPHE Université de Lausanne, Lausanne, Switzerland
25 Institute of Nuclear Research, Debrecen, Hungary
26 Particle Physics Department, Weizmann Institute of Science, Rehovot, Israel
27 Department of Physics, Indiana University, Bloomington, IN, USA
28 Physikalisches Institut, Universität Bonn, Bonn, Germany
29 Research Institute for Particle and Nuclear Physics, Budapest, Hungary; Institute of Nuclear Research, Debrecen, Hungary
30 Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Québec, Canada
31 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; Dept. Physics, University of Illinois at Urbana-Champaign, Urbana-Champaign, USA
32 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan; High Energy Accelerator Research Organisation (KEK), Tsukuba, Ibaraki, Japan
33 Physikalisches Institut, Universität Bonn, Bonn, Germany; Technische Universität, Dresden, Germany
34 Institute of Nuclear Research, Debrecen, Hungary; Department of Experimental Physics, University of Debrecen, Debrecen, Hungary
35 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; Dept of Physics, University of Toronto, Toronto, Canada
36 III Physikalisches Institut, Technische Hochschule Aachen, Aachen, Germany
37 University of California, San Diego, USA
38 Department of Physics, University of British Columbia, Vancouver, BC, Canada; University of Alberta, Alberta, Canada
39 Bergische Universität, Wuppertal, Germany
40 Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario, Canada; TRIUMF, Vancouver, Canada
41 University College London, London, UK
42 International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan; Kobe University, Kobe, Japan; University of Pennsylvania, Philadelphia, Pennsylvania, USA
43 Department of Physics, Yale University, New Haven , CT, USA
44 Department of Physics, University of California, Riverside, CA, USA; Research Institute for Particle and Nuclear Physics, Budapest, Hungary
45 Department of Physics, University of Alberta, Edmonton, AB, Canada
46 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; University of Mining and Metallurgy, Cracow, Poland
47 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; University of Antwerpen, Antwerpen, Belgium
48 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; DESY, Hamburg, Germany
49 III Physikalisches Institut, Technische Hochschule Aachen, Aachen, Germany; MPI München, München, Germany
50 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; Dept of Physics, University of Liverpool, Liverpool, UK
51 Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, IL, USA; Columbia University, New York, USA
52 Department of Physics, University of Oregon, Eugene, OR, USA
53 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
54 CERN, European Organisation for Nuclear Research, Geneva 23, Switzerland; TRIUMF, Vancouver, Canada
55 School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, Manchester, UK; Dept of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
Pages
767-785
Publication year
2007
Publication date
Dec 2007
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2293792267
Copyright
The European Physical Journal C is a copyright of Springer, (2007). All Rights Reserved.