The production of neutral kaons in Z0 decays and their Bose-Einstein correlations

Zeitschrift für Physik C Particles and Fields - Tập 67 - Trang 389-401 - 1995
R. Akers1, G. Alexander2, J. Allison1, K. Ametewee3, K. J. Anderson4, S. Arcelli5, S. Asai6,7, D. Axen8, G. Azuelos9,10, A. H. Ball11, E. Barberio12, R. J. Barlow1, R. Bartoldus13, J. R. Batley14, G. Beaudoin9, A. Beck2, G. A. Beck15, C. Beeston1, T. Behnke16, K. W. Bell17, G. Bella2, S. Bentvelsen18, P. Berlich19, S. Bethke20, O. Biebel20, I. J. Bloodworth21, P. Bock22, H. M. Bosch22, M. Boutemeur9, S. Braibant23, P. Bright-Thomas3, R. M. Brown17, A. Buijs18, H. J. Burckhart18, R. Bürgin19, C. Burgard16, N. Capdevielle9, P. Capiluppi5, R. K. Carnegie24, A. A. Carter15, J. R. Carter14, C. Y. Chang11, C. Charlesworth24, D. G. Charlton21, S. L. Chu25, P. E. L. Clarke, J. C. Clayton21, S. G. Clowes1, I. Cohen2, J. E. Conboy26, O. C. Cooke1, M. Cuffiani5, S. Dado27, C. Dallapiccola11, G. M. Dallavalle5, C. Darling28, S. De Jong23, L. A. del Pozo18, H. Deng11, M. Dittmar25, M. S. Dixit29, E. do Couto e Silva23, J. E. Duboscq18, E. Duchovni12, G. Duckeck18, I. P. Duerdoth1, U. C. Dunwoody14, J. E. G. Edwards1, P. A. Elcombe14, P. G. Estabrooks24, E. Etzion2, H. G. Evans4, F. Fabbri5, B. Fabbro30, M. Fanti5, P. Fath22, M. Fierro5, M. Fincke-Keeler31, H. M. Fischer13, P. Fischer13, R. Folman12, D. G. Fong11, M. Foucher11, H. Fukui6,7, A. Fürtjes18, P. Gagnon24, A. Gaidot30, J. W. Gary25, J. Gascon9, N. I. Geddes17, C. Geich-Gimbel13, S. W. Gensler4, F. X. Gentit30, T. Geralis17, G. Giacomelli5, P. Giacomelli25, R. Giacomelli5, V. Gibson14, W. R. Gibson15, J. D. Gillies17, J. Goldberg32, D. M. Gingrich33,10, M. J. Goodrick14, W. Gorn25, C. Grandi5, E. Gross12, J. Hagemann16, G. G. Hanson23, M. Hansroul18, C. K. Hargrove29, P. A. Hart4, M. Hauschild18, C. M. Hawkes18, E. Heflin25, R. J. Hemingway24, G. Herten34, R. D. Heuer18, J. C. Hill14, S. J. Hillier18, T. Hilse19, P. R. Hobson3, D. Hochman12, R. J. Homer21, A. K. Honma31,10, R. Howard8, R. E. Hughes-Jones1, P. Igo-Kemenes22, D. C. Imrie3, A. Jawahery11, P. W. Jeffreys17, H. Jeremie9, M. Jimack21, M. Jones24, R. W. L. Jones18, P. Jovanovic21, C. Jui25, D. Karlen24, J. Kanzaki6,7, K. Kawagoe6,7, T. Kawamoto6,7, R. K. Keeler31, R. G. Kellogg11, B. W. Kennedy17, B. King18, J. King15, J. Kirk8, S. Kluth14, T. Kobayashi6,7, M. Kobel34, D. S. Koetke24, T. P. Kokott13, S. Komamiya6,7, R. Kowalewski18, T. Kress22, P. Krieger24, J. von Krogh22, P. Kyberd15, G. D. Lafferty1, H. Lafoux18, R. Lahmann11, W. P. Lai35, J. Lauber18, J. G. Layter25, P. Leblanc9, A. M. Lee28, E. Lefebvre9, D. Lellouch12, C. Leroy9, J. Letts5, L. Levinson12, S. L. Lloyd15, F. K. Loebinger1, G. D. Long11, B. Lorazo9, M. J. Losty29, X. C. Lou18, J. Ludwig34, A. Luig19, M. Mannelli18, S. Marcellini5, C. Markus13, A. J. Martin15, J. P. Martin9, T. Mashimo6,7, W. Matthews3, P. Mättig13, U. Maur13, J. McKenna8, T. J. McMahon21, A. I. McNab15, F. Meijers18, F. S. Merritt4, H. Mes29, A. Michelini18, R. P. Middleton17, G. Mikenberg12, D. J. Miller26, R. Mir12, W. Mohr34, A. Montanari5, T. Mori6,7, M. Morii6,7, U. Müller13, B. Nellen13, B. Nijjhar1, S. W. O'Neale21, F. G. Oakham29, F. Odorici5, H. O. Ogren23, N. J. Oldershaw1, C. J. Oram31,10, M. J. Oreglia4, S. Orito6,7, F. Palmonari5, J. P. Pansart30, G. N. Patrick17, M. J. Pearce21, P. D. Phillips1, J. E. Pilcher4, J. Pinfold33, D. E. Plane18, P. Poffenberger31, B. Poli5, A. Posthaus13, T. W. Pritchard15, H. Przysiezniak33, M. W. Redmond18, D. L. Rees18, D. Rigby21, M. G. Rison14, S. A. Robins15, D. Robinson14, N. Rodning33, J. M. Roney31, E. Ros18, A. M. Rossi5, M. Rosvick31, P. Routenburg33, Y. Rozen18, K. Runge19, O. Runolfsson18, D. R. Rust23, M. Sasaki6,7, C. Sbarra5, A. D. Schaile18, O. Schaile19, F. Scharf13, P. Scharff-Hansen18, P. Schenk25, B. Schmitt13, M. Schröder18, H. C. Schultz-Coulon34, P. Schütz13, M. Schulz18, C. Schwick16, J. Schwiening13, W. G. Scott17, M. Settles23, T. G. Shears14, B. C. Shen25, C. H. Shepherd-Themistocleous29, P. Sherwood26, G. P. Siroli5, A. Skillman26, A. Skuja11, A. M. Smith18, T. J. Smith31, G. A. Snow11, R. Sobie31, S. Söldner-Rembold19, R. W. Springer33, M. Sproston17, A. Stahl13, M. Starks23, C. Stegmann34, K. Stephens1, J. Steuerer31, B. Stockhausen13, D. Strom35, P. Szymanski17, R. Tafirout9, H. Takeda6,7, T. Takeshita6,7, P. Taras9, S. Tarem12, M. Tecchio4, P. Teixeira-Dias22, N. Tesch13, M. A. Thomson18, O. Tousignant, S. Towers24, M. Tscheulin34, T. Tsukamoto6,7, A. S. Turcot4, M. F. Turner-Watson18, P. Utzat22, R. Van Kooten23, G. Vasseur30, P. Vikas9, M. Vincter31, A. Wagner16, D. L. Wagner4, C. P. Ward14, D. R. Ward14, J. J. Ward26, P. M. Watkins21, A. T. Watson21, N. K. Watson29, P. Weber24, P. S. Wells18, N. Wermes13, B. Wilkens19, G. W. Wilson16, J. A. Wilson21, V. -H. Winterer19, T. Wlodek12, G. Wolf12, S. Wotton22, T. R. Wyatt1, A. Yeaman15, G. Yekutieli12, M. Yurko9, V. Zacek9, W. Zeuner18, G. T. Zorn11
1Department of Physics, Schuster Laboratory, The University, Manchester, UK
2Department of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
3Brunel University, Uxbridge, UK
4Entico Fermi Institute and Department of Physics, University of Chicago, Chicago, USA
5Dipartimento di Fisica dell' Università di Bologna and INFN, Bologna, Italy
6International Centre for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
7Kobe University, Kobe, Japan
8Department of Physics, University of British Columbia, Vancouver, Canada
9Laboratoire de Physique Nucléaire, Université de Montréal, Montréal, Canada
10TRIUMF, Vancouver, Canada
11Department of Physics, University of Maryland, College Park, USA
12Particle Physics Department, Weizmann Institute of Science, Rehovot, Israel
13Physikalisches Institut, Universität Bonn, Bonn, Germany
14Cavendish Laboratory, Cambridge, UK
15Queen Mary and Westfield College, University of London, London, UK
16II Institut für Experimental Physik, Universität Hamburg/DESY, Hamburg, Germany
17Rutherford Appleton Laboratory, Didcot, UK
18CERN, European Organisation for Particle Physics, Geneva 23, Switzerland
19Fakultät für Physik, Albert-Ludwigs-Universität, Freiburg, Germany
20III Physikalisches Institut, Technische Hochschule Aachen, Aachen, Germany
21School of Physics and Space Research, University of Birmingham, Birmingham, UK
22Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
23Department of Physics, Indiana University, Bloomington, USA
24Department of Physics, Carleton University, Ottawa, Canada
25Department of Physics, University of California, Riverside, USA
26University College London, London, UK
27Department of Physics, Technion - Israel Institute of Technology, Haifa, Israel
28Dept of Physics, Duke University, Durham, USA
29Centre for Research in Particle Physics, Carleton University, Ottawa, Canada
30CEA, DAPNIA/SPP, CE-Saclay, Gif-sur-Yvette, France
31Department of Physics, University of Victoria, Victoria, Canada
32Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
33Department of Physics, University of Alberta, Edmonton, Canada
34Fakultät für Physik, Albert Ludwigs Universität, Freiburg, Germany
35Department of Physics, University of Oregon, Eugene, USA

Tóm tắt

The production of neutral kaons in e+e− annihilation at centre-of-mass energies in the region of the Z0 mass and their Bose-Einstein correlations are investigated with the OPAL detector at LEP. A total of about 1.26×106 Z0 hadronic decay events are used in the analysis. The production rate of K0 mesons is found to be 1.99±0.01±0.04 per hadronic event, where the first error is statistical and the second systematic. Both the rate and the differential cross section for K0 production are compared to the predictions of Monte Carlo generators. This comparison indicates that the fragmentation is too soft in bothJetset andHerwig. Bose-Einstein correlations in K s 0 K s 0 pairs are measured through the quantityQ, the four momentum difference of the pair. A threshold enhancement is observed in K s 0 K s 0 pairs originating from a mixed sample of $$K^0 \bar K^0$$ and K0K0 ( $$\bar K^0 \bar K^0$$ ) pairs. For the strength of the effect and for the radius of the emitting source we find values of λ=1.14±0.23±0.32 andR 0=(0.76±0.10±0.11) fm respectively. The first error is statistical and the second systematic.

Tài liệu tham khảo

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Zeitschrift für Physik C Particles and Fields

Tập 67

389-401

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