Investigation of Colour Reconnection in WW events with the DELPHI detector at LEP-2

J. Abdallah; P. Abreu; W. Adam; P. Adzic; T. Albrecht; R. Alemany-Fernandez; T. Allmendinger; P.P. Allport; U. Amaldi; N. Amapane; S. Amato; E. Anashkin; A. Andreazza; S. Andringa; N. Anjos; P. Antilogus; W-D. Apel; Y. Arnoud; S. Ask; B. Asman; J.E. Augustin; A. Augustinus; P. Baillon; A. Ballestrero; P. Bambade; R. Barbier; D. Bardin; G.J. Barker; A. Baroncelli; M. Battaglia; M. Baubillier; K-H. Becks; M. Begalli; A. Behrmann; E. Ben-Haim; N. Benekos; A. Benvenuti; C. Berat; M. Berggren; L. Berntzon; D. Bertrand; M. Besancon; N. Besson; D. Bloch; M. Blom; M. Bluj; M. Bonesini; M. Boonekamp; P.S.L. Booth; G. Borisov; O. Botner; B. Bouquet; T.J.V. Bowcock; I. Boyko; M. Bracko; R. Brenner; E. Brodet; P. Bruckman; J.M. Brunet; B. Buschbeck; P. Buschmann; M. Calvi; T. Camporesi; V. Canale; F. Carena; N. Castro; F. Cavallo; M. Chapkin; Ph. Charpentier; P. Checchia; R. Chierici; P. Chliapnikov; J. Chudoba; S.U. Chung; K. Cieslik; P. Collins; R. Contri; G. Cosme; F. Cossutti; M.J. Costa; D. Crennell; J. Cuevas; J. D’Hondt; J. Dalmau; T. da Silva; W. Da Silva; G. Della Ricca; A. De Angelis; W. De Boer; C. De Clercq; B. De Lotto; N. De Maria; A. De Min; L. de Paula; L. Di Ciaccio; A. Di Simone; K. Doroba; J. Drees; G. Eigen; T. Ekelof; M. Ellert; M. Elsing; M.C. Espirito Santo; G. Fanourakis; D. Fassouliotis; M. Feindt; J. Fernandez; A. Ferrer; F. Ferro; U. Flagmeyer; H. Foeth; E. Fokitis; F. Fulda-Quenzer; J. Fuster; M. Gandelman; C. Garcia; Ph. Gavillet; E. Gazis; R. Gokieli; B. Golob; G. Gomez-Ceballos; P. Goncalves; E. Graziani; G. Grosdidier; K. Grzelak; J. Guy; C. Haag; A. Hallgren; K. Hamacher; K. Hamilton; S. Haug; F. Hauler; V. Hedberg; M. Hennecke; H. Herr; J. Hoffman; S-O. Holmgren; P.J. Holt; M.A. Houlden; J.N. Jackson; G. Jarlskog; P. Jarry; D. Jeans; E.K. Johansson; P.D. Johansson; P. Jonsson; C. Joram; L. Jungermann; F. Kapusta; S. Katsanevas; E. Katsoufis; G. Kernel; B.P. Kersevan; U. Kerzel; B.T. King; N.J. Kjaer; P. Kluit; P. Kokkinias; C. Kourkoumelis; O. Kouznetsov; Z. Krumstein; M. Kucharczyk; J. Lamsa; G. Leder; F. Ledroit; L. Leinonen; R. Leitner; J. Lemonne; V. Lepeltier; T. Lesiak; W. Liebig; D. Liko; A. Lipniacka; J.H. Lopes; J.M. Lopez; D. Loukas; P. Lutz; L. Lyons; J. MacNaughton; A. Malek; S. Maltezos; F. Mandl; J. Marco; R. Marco; B. Marechal; M. Margoni; J-C. Marin; C. Mariotti; A. Markou; C. Martinez-Rivero; J. Masik; N. Mastroyiannopoulos; F. Matorras; C. Matteuzzi; F. Mazzucato; M. Mazzucato; R. Mc Nulty; C. Meroni; E. Migliore; W. Mitaroff; U. Mjoernmark; T. Moa; M. Moch; K. Moenig; R. Monge; J. Montenegro; D. Moraes; S. Moreno; P. Morettini; U. Mueller; K. Muenich; M. Mulders; L. Mundim; W. Murray; B. Muryn; G. Myatt; T. Myklebust; M. Nassiakou; F. Navarria; K. Nawrocki; R. Nicolaidou; M. Nikolenko; A. Oblakowska-Mucha; V. Obraztsov; A. Olshevski; A. Onofre; R. Orava; K. Osterberg; A. Ouraou; A. Oyanguren; M. Paganoni; S. Paiano; J.P. Palacios; H. Palka; Th.D. Papadopoulou; L. Pape; C. Parkes; F. Parodi; U. Parzefall; A. Passeri; O. Passon; L. Peralta; V. Perepelitsa; A. Perrotta; A. Petrolini; J. Piedra; L. Pieri; F. Pierre; M. Pimenta; E. Piotto; T. Podobnik; V. Poireau; M.E. Pol; G. Polok; V. Pozdniakov; N. Pukhaeva; A. Pullia; J. Rames; A. Read; P. Rebecchi; J. Rehn; D. Reid; R. Reinhardt; P. Renton; F. Richard; J. Ridky; M. Rivero; D. Rodriguez; A. Romero; P. Ronchese; P. Roudeau; T. Rovelli; V. Ruhlmann-Kleider; D. Ryabtchikov; A. Sadovsky; L. Salmi; J. Salt; C. Sander; A. Savoy-Navarro; U. Schwickerath; R. Sekulin; M. Siebel; A. Sisakian; G. Smadja; O. Smirnova; A. Sokolov; A. Sopczak; R. Sosnowski; T. Spassov; M. Stanitzki; A. Stocchi; J. Strauss; B. Stugu; M. Szczekowski; M. Szeptycka; T. Szumlak; T. Tabarelli; A.C. Taffard; F. Tegenfeldt; J. Timmermans; L. Tkatchev; M. Tobin; S. Todorovova; B. Tome; A. Tonazzo; P. Tortosa; P. Travnicek; D. Treille; G. Tristram; M. Trochimczuk; C. Troncon; M-L. Turluer; I.A. Tyapkin; P. Tyapkin; S. Tzamarias; V. Uvarov; G. Valenti; P. Van Dam; J. Van Eldik; N. van Remortel; I. Van Vulpen; G. Vegni; F. Veloso; W. Venus; P. Verdier; V. Verzi; D. Vilanova; L. Vitale; V. Vrba; H. Wahlen; A.J. Washbrook; C. Weiser; D. Wicke; J. Wickens; G. Wilkinson; M. Winter; M. Witek; O. Yushchenko; A. Zalewska; P. Zalewski; D. Zavrtanik; V. Zhuravlov; N.I. Zimin; A. Zintchenko; M. Zupan

doi:10.1140/epjc/s10052-007-0304-9

2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2007) 51: 249-269
https://doi.org/10.1140/epjc/s10052-007-0304-9

Regular Article - Experimental Physics

Investigation of Colour Reconnection in WW events with the DELPHI detector at LEP-2

J. Abdallah²⁶, P. Abreu²³, W. Adam⁵⁵, P. Adzic¹², T. Albrecht¹⁸, R. Alemany-Fernandez⁹, T. Allmendinger¹⁸, P.P. Allport²⁴, U. Amaldi³⁰, N. Amapane⁴⁸, S. Amato⁵², E. Anashkin³⁷, A. Andreazza²⁹, S. Andringa²³, N. Anjos²³, P. Antilogus²⁶, W-D. Apel¹⁸, Y. Arnoud¹⁵, S. Ask²⁷, B. Asman⁴⁷, J.E. Augustin²⁶, A. Augustinus⁹, P. Baillon⁹, A. Ballestrero⁴⁹, P. Bambade²¹, R. Barbier²⁸, D. Bardin¹⁷, G.J. Barker⁵⁷, A. Baroncelli⁴⁰, M. Battaglia⁹, M. Baubillier²⁶, K-H. Becks⁵⁸, M. Begalli⁷, A. Behrmann⁵⁸, E. Ben-Haim²¹, N. Benekos³³, A. Benvenuti⁵, C. Berat¹⁵, M. Berggren²⁶, L. Berntzon⁴⁷, D. Bertrand², M. Besancon⁴¹, N. Besson⁴¹, D. Bloch¹⁰, M. Blom³², M. Bluj⁵⁶, M. Bonesini³⁰, M. Boonekamp⁴¹, P.S.L. Booth²⁴, G. Borisov²², O. Botner⁵³, B. Bouquet²¹, T.J.V. Bowcock²⁴, I. Boyko¹⁷, M. Bracko⁴⁴, R. Brenner⁵³, E. Brodet³⁶, P. Bruckman¹⁹, J.M. Brunet⁸, B. Buschbeck⁵⁵, P. Buschmann⁵⁸, M. Calvi³⁰, T. Camporesi⁹, V. Canale³⁹, F. Carena⁹, N. Castro²³, F. Cavallo⁵, M. Chapkin⁴³, Ph. Charpentier⁹, P. Checchia³⁷, R. Chierici⁹, P. Chliapnikov⁴³, J. Chudoba⁹, S.U. Chung⁹, K. Cieslik¹⁹, P. Collins⁹, R. Contri¹⁴, G. Cosme²¹, F. Cossutti⁵⁰, M.J. Costa⁵⁴, D. Crennell³⁸, J. Cuevas³⁵, J. D’Hondt², J. Dalmau⁴⁷, T. da Silva⁵², W. Da Silva²⁶, G. Della Ricca⁵⁰, A. De Angelis⁵¹, W. De Boer¹⁸, C. De Clercq², B. De Lotto⁵¹, N. De Maria⁴⁸, A. De Min³⁷, L. de Paula⁵², L. Di Ciaccio³⁹, A. Di Simone⁴⁰, K. Doroba⁵⁶, J. Drees⁵⁸^,9, G. Eigen⁴, T. Ekelof⁵³, M. Ellert⁵³, M. Elsing⁹, M.C. Espirito Santo²³, G. Fanourakis¹², D. Fassouliotis¹²^,3, M. Feindt¹⁸, J. Fernandez⁴², A. Ferrer⁵⁴, F. Ferro¹⁴, U. Flagmeyer⁵⁸, H. Foeth⁹, E. Fokitis³³, F. Fulda-Quenzer²¹, J. Fuster⁵⁴, M. Gandelman⁵², C. Garcia⁵⁴, Ph. Gavillet⁹, E. Gazis³³, R. Gokieli⁹^,56, B. Golob⁴⁴^,46, G. Gomez-Ceballos⁴², P. Goncalves²³, E. Graziani⁴⁰, G. Grosdidier²¹, K. Grzelak⁵⁶, J. Guy³⁸, C. Haag¹⁸, A. Hallgren⁵³, K. Hamacher⁵⁸, K. Hamilton³⁶, S. Haug³⁴, F. Hauler¹⁸, V. Hedberg²⁷, M. Hennecke¹⁸, H. Herr⁹, J. Hoffman⁵⁶, S-O. Holmgren⁴⁷, P.J. Holt⁹, M.A. Houlden²⁴, J.N. Jackson²⁴, G. Jarlskog²⁷, P. Jarry⁴¹, D. Jeans³⁶, E.K. Johansson⁴⁷, P.D. Johansson⁴⁷, P. Jonsson²⁸, C. Joram⁹, L. Jungermann¹⁸, F. Kapusta²⁶, S. Katsanevas²⁸, E. Katsoufis³³, G. Kernel⁴⁴, B.P. Kersevan⁴⁴^,46, U. Kerzel¹⁸, B.T. King²⁴, N.J. Kjaer⁹, P. Kluit³², P. Kokkinias¹², C. Kourkoumelis³, O. Kouznetsov¹⁷, Z. Krumstein¹⁷, M. Kucharczyk¹⁹, J. Lamsa¹, G. Leder⁵⁵, F. Ledroit¹⁵, L. Leinonen⁴⁷, R. Leitner³¹, J. Lemonne², V. Lepeltier²¹, T. Lesiak¹⁹, W. Liebig⁵⁸, D. Liko⁵⁵, A. Lipniacka⁴⁷, J.H. Lopes⁵², J.M. Lopez³⁵, D. Loukas¹², P. Lutz⁴¹, L. Lyons³⁶, J. MacNaughton⁵⁵, A. Malek⁵⁸, S. Maltezos³³, F. Mandl⁵⁵, J. Marco⁴², R. Marco⁴², B. Marechal⁵², M. Margoni³⁷, J-C. Marin⁹, C. Mariotti⁹, A. Markou¹², C. Martinez-Rivero⁴², J. Masik¹³, N. Mastroyiannopoulos¹², F. Matorras⁴², C. Matteuzzi³⁰, F. Mazzucato³⁷, M. Mazzucato³⁷, R. Mc Nulty²⁴, C. Meroni²⁹, E. Migliore⁴⁸, W. Mitaroff⁵⁵, U. Mjoernmark²⁷, T. Moa⁴⁷, M. Moch¹⁸, K. Moenig⁹^,11, R. Monge¹⁴, J. Montenegro³², D. Moraes⁵², S. Moreno²³, P. Morettini¹⁴, U. Mueller⁵⁸, K. Muenich⁵⁸, M. Mulders³², L. Mundim⁷, W. Murray³⁸, B. Muryn²⁰, G. Myatt³⁶, T. Myklebust³⁴, M. Nassiakou¹², F. Navarria⁵, K. Nawrocki⁵⁶, R. Nicolaidou⁴¹, M. Nikolenko¹⁷^,10, A. Oblakowska-Mucha²⁰, V. Obraztsov⁴³, A. Olshevski¹⁷, A. Onofre²³, R. Orava¹⁶, K. Osterberg¹⁶, A. Ouraou⁴¹, A. Oyanguren⁵⁴, M. Paganoni³⁰, S. Paiano⁵, J.P. Palacios²⁴, H. Palka¹⁹, Th.D. Papadopoulou³³, L. Pape⁹, C. Parkes²⁵, F. Parodi¹⁴, U. Parzefall⁹, A. Passeri⁴⁰, O. Passon⁵⁸, L. Peralta²³, V. Perepelitsa⁵⁴, A. Perrotta⁵, A. Petrolini¹⁴, J. Piedra⁴², L. Pieri⁴⁰, F. Pierre⁴¹, M. Pimenta²³, E. Piotto⁹, T. Podobnik⁴⁴^,46, V. Poireau⁹, M.E. Pol⁶, G. Polok¹⁹, V. Pozdniakov¹⁷, N. Pukhaeva¹⁷, A. Pullia³⁰, J. Rames¹³, A. Read³⁴, P. Rebecchi⁹, J. Rehn¹⁸, D. Reid³², R. Reinhardt⁵⁸, P. Renton³⁶, F. Richard²¹, J. Ridky¹³, M. Rivero⁴², D. Rodriguez⁴², A. Romero⁴⁸, P. Ronchese³⁷, P. Roudeau²¹, T. Rovelli⁵, V. Ruhlmann-Kleider⁴¹, D. Ryabtchikov⁴³, A. Sadovsky¹⁷, L. Salmi¹⁶, J. Salt⁵⁴, C. Sander¹⁸, A. Savoy-Navarro²⁶, U. Schwickerath⁹, R. Sekulin³⁸, M. Siebel⁵⁸, A. Sisakian¹⁷, G. Smadja²⁸, O. Smirnova²⁷, A. Sokolov⁴³, A. Sopczak²², R. Sosnowski⁵⁶, T. Spassov⁹, M. Stanitzki¹⁸, A. Stocchi²¹, J. Strauss⁵⁵, B. Stugu⁴, M. Szczekowski⁵⁶, M. Szeptycka⁵⁶, T. Szumlak²⁰, T. Tabarelli³⁰, A.C. Taffard²⁴, F. Tegenfeldt⁵³, J. Timmermans³²^*, L. Tkatchev¹⁷, M. Tobin²⁴, S. Todorovova¹³, B. Tome²³, A. Tonazzo³⁰, P. Tortosa⁵⁴, P. Travnicek¹³, D. Treille⁹, G. Tristram⁸, M. Trochimczuk⁵⁶, C. Troncon²⁹, M-L. Turluer⁴¹, I.A. Tyapkin¹⁷, P. Tyapkin¹⁷, S. Tzamarias¹², V. Uvarov⁴³, G. Valenti⁵, P. Van Dam³², J. Van Eldik⁹, N. van Remortel¹⁶, I. Van Vulpen⁹, G. Vegni²⁹, F. Veloso²³, W. Venus³⁸, P. Verdier²⁸, V. Verzi³⁹, D. Vilanova⁴¹, L. Vitale⁵⁰, V. Vrba¹³, H. Wahlen⁵⁸, A.J. Washbrook²⁴, C. Weiser¹⁸, D. Wicke⁹, J. Wickens², G. Wilkinson³⁶, M. Winter¹⁰, M. Witek¹⁹, O. Yushchenko⁴³, A. Zalewska¹⁹, P. Zalewski⁵⁶, D. Zavrtanik⁴⁵, V. Zhuravlov¹⁷, N.I. Zimin¹⁷, A. Zintchenko¹⁷, M. Zupan¹² and The DELPHI Collaboration

¹ Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011-3160, USA
² IIHE, ULB-VUB, Pleinlaan 2, 1050, Brussels, Belgium
³ Physics Laboratory, University of Athens, Solonos Str. 104, 10680, Athens, Greece
⁴ Department of Physics, University of Bergen, Allégaten 55, 5007, Bergen, Norway
⁵ Dipartimento di Fisica, Università di Bologna and INFN, Via Irnerio 46, 40126, Bologna, Italy
⁶ Centro Brasileiro de Pesquisas Físicas, rua Xavier Sigaud 150, 22290, Rio de Janeiro, Brazil
⁷ Inst. de Física, Univ. Estadual do Rio de Janeiro, rua São Francisco Xavier 524, Rio de Janeiro, Brazil
⁸ Lab. de Physique Corpusculaire, IN2P3-CNRS, Collège de France, 75231, Paris Cedex 05, France
⁹ CERN, 1211, Geneva 23, Switzerland
¹⁰ Institut de Recherches Subatomiques, IN2P3 - CNRS/ULP - BP20, 67037, Strasbourg Cedex, France
¹¹ DESY-Zeuthen, Platanenallee 6, 15735, Zeuthen, Germany
¹² Institute of Nuclear Physics, N.C.S.R. Demokritos, P.O. Box 60228, 15310, Athens, Greece
¹³ Inst. of Phys. of the C.A.S. High Energy Physics Division, FZU, Na Slovance 2, 180 40, Praha 8, Czech Republic
¹⁴ Dipartimento di Fisica, Università di Genova and INFN, Via Dodecaneso 33, 16146, Genova, Italy
¹⁵ Institut des Sciences Nucléaires, IN2P3-CNRS, Université de Grenoble 1, 38026, Grenoble Cedex, France
¹⁶ Helsinki Institute of Physics and Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
¹⁷ Head Post Office, Joint Institute for Nuclear Research, Dubna, P.O. Box 79, 101 000, Moscow, Russian Federation
¹⁸ Institut für Experimentelle Kernphysik, Universität Karlsruhe, Postfach 6980, 76128, Karlsruhe, Germany
¹⁹ Institute of Nuclear Physics PAN, Ul. Radzikowskiego 152, 31142, Krakow, Poland
²⁰ Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, 30055, Krakow, Poland
²¹ Lab. de l’Accélérateur Linéaire, IN2P3-CNRS, Université de Paris-Sud, Bât. 200, 91405, Orsay Cedex, France
²² School of Physics and Chemistry, University of Lancaster, Lancaster, LA1 4YB, UK
²³ LIP, IST,, FCUL – Av. Elias Garcia, 14-1o, 1000, Lisboa Codex, Portugal
²⁴ Department of Physics, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UK
²⁵ Dept. of Physics and Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ, UK
²⁶ LPNHE, IN2P3-CNRS, Univ. Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, 75252, Paris Cedex 05, France
²⁷ Department of Physics, University of Lund, Sölvegatan 14, 223 63, Lund, Sweden
²⁸ IPNL, IN2P3-CNRS, Université Claude Bernard de Lyon, 69622, Villeurbanne Cedex, France
²⁹ Dipartimento di Fisica, Università di Milano and INFN-MILANO, Via Celoria 16, 20133, Milan, Italy
³⁰ Dipartimento di Fisica, Univ. di Milano-Bicocca and INFN-MILANO, Piazza della Scienza 3, 20126, Milan, Italy
³¹ IPNP of MFF, Charles Univ., Areal MFF, V Holesovickach 2, 180 00, Praha 8, Czech Republic
³² NIKHEF, Postbus 41882, 1009 DB, Amsterdam, The Netherlands
³³ Physics Department, National Technical University, Zografou Campus, 15773, Athens, Greece
³⁴ Physics Department, University of Oslo, Blindern, 0316, Oslo, Norway
³⁵ Dpto. Fisica, Univ. Oviedo, Avda. Calvo Sotelo s/n, 33007, Oviedo, Spain
³⁶ Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK
³⁷ Dipartimento di Fisica, Università di Padova and INFN, Via Marzolo 8, 35131, Padua, Italy
³⁸ Rutherford Appleton Laboratory, Chilton, Didcot, OX11 OQX, UK
³⁹ Dipartimento di Fisica, Università di Roma II and INFN, Tor Vergata, 00173, Rome, Italy
⁴⁰ Dipartimento di Fisica, Università di Roma III and INFN, Via della Vasca Navale 84, 00146, Rome, Italy
⁴¹ DAPNIA/Service de Physique des Particules, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
⁴² Instituto de Fisica de Cantabria (CSIC-UC), Avda. los Castros s/n, 39006, Santander, Spain
⁴³ Inst. for High Energy Physics, Serpukov , P.O. Box 35, Protvino, Moscow Region, Russian Federation
⁴⁴ J. Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
⁴⁵ Laboratory for Astroparticle Physics, University of Nova Gorica, Kostanjeviska 16a, 5000, Nova Gorica, Slovenia
⁴⁶ Department of Physics, University of Ljubljana, 1000, Ljubljana, Slovenia
⁴⁷ Fysikum, Stockholm University, Box 6730, 113 85, Stockholm, Sweden
⁴⁸ Dipartimento di Fisica Sperimentale, Università di Torino and INFN, Via P. Giuria 1, 10125, Turin, Italy
⁴⁹ INFN, Sezione di Torino and Dipartimento di Fisica Teorica, Università di Torino, Via Giuria 1, 10125, Turin, Italy
⁵⁰ Dipartimento di Fisica, Università di Trieste and INFN, Via A. Valerio 2, 34127, Trieste, Italy
⁵¹ Istituto di Fisica, Università di Udine and INFN, 33100, Udine, Italy
⁵² C.P. 68528, Univ. Federal do Rio de Janeiro, Cidade Univ., Ilha do Fundão, 21945-970, Rio de Janeiro, Brazil
⁵³ Department of Radiation Sciences, University of Uppsala, P.O. Box 535, 751 21, Uppsala, Sweden
⁵⁴ IFIC, Valencia-CSIC, and D.F.A.M.N., U. de Valencia, Avda. Dr. Moliner 50, 46100, Burjassot, Valencia, Spain
⁵⁵ Institut für Hochenergiephysik, Österr. Akad. d. Wissensch., Nikolsdorfergasse 18, 1050, Vienna, Austria
⁵⁶ Inst. Nuclear Studies and University of Warsaw, Ul. Hoza 69, 00681, Warsaw, Poland
⁵⁷ University of Warwick, Coventry, CV4 7AL, UK
⁵⁸ Fachbereich Physik, University of Wuppertal, Postfach 100 127, 42097, Wuppertal, Germany

^* e-mail: Jan.Timmermans@cern.ch

Received: 13 December 2006
Revised: 23 March 2007
Published online: 5 May 2007

Abstract

In the reaction e⁺e^-→WW→(q₁q̄₂)(q₃q̄₄) the usual hadronization models treat the colour singlets q₁q̄₂ and q₃q̄₄ coming from two W bosons independently. However, since the final state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This effect is known as colour reconnection. In this article the results of the investigation of colour reconnection effects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle flow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its κ parameter most compatible with the data was found to be: κ_SK-I=2.2^+2.5 _-1.3 corresponding to the probability of reconnection to be in the range at 68% confidence level with its best value at 0.52.