2018 Impact factor 4.843
Particles and Fields


Eur. Phys. J. C 22, 17-29 (2001)
DOI: 10.1007/s1005201O0782

Search for technicolor with DELPHI

The DELPHI Collaboration1, J. Abdallah2, P. Abreu3, W. Adam4, P. Adzic5, T. Albrecht6, T. Alderweireld7, R. Alemany-Fernandez8, P.P. Allport9, S. Almehed10, T. Almendinger6, U. Amaldi11, N. Amapane12, S. Amato13, E. Anashkin14, A. Andreazza15, S. Andringa3, N. Anjos3, P. Antilogus16, W-D. Apel6, Y. Arnoud17, S. Ask10, B. Asman18, J.E. Augustin2, A. Augustinus8, P. Baillon8, A. Ballestrero12, P. Bambade19, R. Barbier16, D. Bardin20, G. Barker6, A. Baroncelli21, M. Battaglia8, M. Baubillier2, K-H. Becks22, M. Begalli23, A. Behrmann22, T. Bellunato8, N. Benekos24, A. Benvenuti25, C. Berat17, M. Berggren2, L. Berntzon18, D. Bertrand7, M. Besancon26, N. Besson26, D. Bloch27, M. Blom28, I. Boiko20, M. Bonesini11, M. Boonekamp26, P.S.L. Booth9, G. Borisov8, 29, O. Botner30, B. Bouquet19, T.J.V. Bowcock9, M. Bracko31, R. Brenner30, E. Brodet32, J. Brodzicka33, P. Bruckman33, J.M. Brunet34, L. Bugge35, P. Buschmann22, M. Calvi11, T. Camporesi8, V. Canale36, F. Carena8, C. Carimalo2, N. Castro3, F. Cavallo25, M. Chapkin37, Ph. Charpentier8, P. Checchia14, R. Chierici8, P. Chliapnikov37, S.U. Chung8, K. Cieslik33, P. Collins8, R. Contri38, G. Cosme19, F. Cossutti39, M.J. Costa40, B. Crawley1, D. Crennell41, J. Cuevas42, J. D'Hondt7, J. Dalmau18, T. da Silva13, W. Da Silva2, G. Della Ricca39, A. De Angelis39, W. De Boer6, C. De Clercq7, B. De Lotto39, N. De Maria12, A. De Min14, L. de Paula13, L. Di Ciaccio36, A. Di Simone21, K. Doroba43, J. Drees22, M. Dris24, G. Eigen44, T. Ekelof30, M. Ellert30, M. Elsing8, M.C. Espirito Santo8, G. Fanourakis5, D. Fassouliotis5, M. Feindt6, J. Fernandez45, A. Ferrer40, F. Ferro38, U. Flagmeyer22, H. Foeth8, E. Fokitis24, F. Fulda-Quenzer19, J. Fuster40, M. Gandelman13, C. Garcia40, Ph. Gavillet8, E. Gazis24, D. Gele27, T. Geralis5, R. Gokieli8, 43, B. Golob31, G. Gomez-Ceballos45, P. Goncalves3, E. Graziani21, G. Grosdidier19, K. Grzelak43, J. Guy41, C. Haag6, F. Hahn8, S. Hahn22, A. Hallgren30, K. Hamacher22, K. Hamilton32, J. Hansen35, S. Haug35, F. Hauler6, V. Hedberg10, M. Hennecke6, H. Herr8, S-O. Holmgren18, P.J. Holt32, M.A. Houlden9, K. Hultqvist18, O. Iouchtchenko37, J.N. Jackson9, P. Jalocha33, Ch. Jarlskog10, G. Jarlskog10, P. Jarry26, D. Jeans32, E.K. Johansson18, P.D. Johansson18, P. Jonsson16, C. Joram8, L. Jungermann6, F. Kapusta2, S. Katsanevas16, E. Katsoufis24, R. Keranen6, G. Kernel31, B.P. Kersevan8, 31, A. Kiiskinen46, B.T. King9, N.J. Kjaer8, P. Kluit28, P. Kokkinias5, C. Kourkoumelis47, O. Kouznetsov20, Z. Krumstein20, M. Kucharczyk33, J. Kurowska43, B. Laforge2, J. Lamsa1, G. Leder4, F. Ledroit17, L. Leinonen18, R. Leitner48, J. Lemonne7, G. Lenzen22, V. Lepeltier19, T. Lesiak33, W. Liebig22, D. Liko8, 4, A. Lipniacka18, J.H. Lopes13, J.M. Lopez42, D. Loukas5, P. Lutz26, L. Lyons32, J. MacNaughton4, A. Malek22, S. Maltezos24, F. Mandl4, J. Marco45, R. Marco45, B. Marechal13, M. Margoni14, J-C. Marin8, C. Mariotti8, A. Markou5, C. Martinez-Rivero45, J. Masik48, N. Mastroyiannopoulos5, F. Matorras45, C. Matteuzzi11, F. Mazzucato14, M. Mazzucato14, R. Mc Nulty9, C. Meroni15, T. Meyer1, E. Migliore12, W. Mitaroff4, U. Mjoernmark10, T. Moa18, M. Moch6, K. Moenig8, 49, R. Monge38, J. Montenegro28, D. Moraes13, S. Moreno3, P. Morettini38, U. Mueller22, K. Muenich22, M. Mulders28, L. Mundim23, W. Murray41, B. Muryn50, G. Myatt32, T. Myklebust35, M. Nassiakou5, F. Navarria25, K. Nawrocki43, S. Nemecek48, R. Nicolaidou26, P. Niezurawski43, M. Nikolenko20, 27, A. Nygren10, A. Oblakowska-Mucha50, V. Obraztsov37, A. Olshevski20, A. Onofre3, R. Orava46, K. Osterberg8, A. Ouraou26, A. Oyanguren40, M. Paganoni11, S. Paiano25, J.P. Palacios9, H. Palka33, Th.D. Papadopoulou24, L. Pape8, C. Parkes9, F. Parodi38, U. Parzefall9, A. Passeri21, O. Passon22, L. Peralta3, V. Perepelitsa40, A. Perrotta25, A. Petrolini38, J. Piedra45, L. Pieri21, F. Pierre26, M. Pimenta3, E. Piotto8, T. Podobnik31, V. Poireau26, M.E. Pol23, G. Polok33, P. Poropat39, V. Pozdniakov20, P. Privitera36, N. Pukhaeva7, 20, A. Pullia15, J. Rames48, L. Ramler6, A. Read35, P. Rebecchi8, J. Rehn6, D. Reid28, R. Reinhardt22, P. Renton32, D. Riabtchikov37, F. Richard19, J. Ridky48, I. Ripp-Baudot27, P. Rodriguez45, A. Romero12, P. Ronchese14, E. Rosenberg1, P. Roudeau19, T. Rovelli25, V. Ruhlmann-Kleider26, A. Sadovsky20, L. Salmi46, J. Salt40, A. Savoy-Navarro2, C. Schwanda4, B. Schwering22, U. Schwickerath8, A. Segar32, R. Sekulin41, M. Siebel22, A. Sisakian20, G. Smadja16, O. Smirnova10, A. Sokolov37, A. Sopczak29, R. Sosnowski43, T. Spassov8, M. Stanitzki6, A. Stocchi19, J. Strauss4, B. Stugu44, M. Szczekowski43, M. Szeptycka43, T. Szumlak50, T. Tabarelli11, A.C. Taffard9, F. Tegenfeldt30, F. Terranova11, J. Timmermans28, N. Tinti25, L. Tkatchev20, M. Tobin9, S. Todorovova8, B. Tome3, A. Tonazzo15, P. Tortosa40, P. Travnicek48, D. Treille8, G. Tristram34, M. Trochimczuk43, C. Troncon15, I.A. Tyapkin20, P. Tyapkin20, S. Tzamarias5, O. Ullaland8, V. Uvarov37, G. Valenti25, P. Van Dam28, J. Van Eldik8, A. Van Lysebetten7, N. van Remortel7, I. Van Vulpen28, G. Vegni15, F. Veloso3, W. Venus41, F. Verbeure7, P. Verdier16, V. Verzi36, D. Vilanova26, L. Vitale39, V. Vrba48, H. Wahlen22, A.J. Washbrook9, C. Weiser8, D. Wicke8, J. Wickens7, G. Wilkinson32, M. Winter27, M. Witek33, A. Zalewska33, P. Zalewski43, D. Zavrtanik31, N.I. Zimin20, A. Zintchenko20, Ph. Zoller27 and M. Zupan5

1  Department of Physics and Astronomy, Iowa State University, Ames IA 50011-3160, USA
2  LPNHE, IN2P3-CNRS, Univ. Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, 75252 Paris Cedex 05, France
3  LIP, IST, FCUL - Av. Elias Garcia, 14- 1o, 1000 Lisboa Codex, Portugal
4  Institut für Hochenergiephysik, Österr. Akad. d. Wissensch., Nikolsdorfergasse 18, 1050 Vienna, Austria
5  Institute of Nuclear Physics, N.C.S.R. Demokritos, P.O. Box 60228, 15310 Athens, Greece
6  Institut für Experimentelle Kernphysik, Universität Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany
7  Physics Department, Universiteit Antwerpen, Universiteitsplein 1, 2610 Antwerpen, Belgium and IIHE, ULB-VUB, Pleinlaan 2, 1050 Brussels, Belgium and Faculté des Sciences, Univ. de l'Etat Mons, Av. Maistriau 19, 7000 Mons, Belgium
8  CERN, CH-1211 Geneva 23, Switzerland
9  Department of Physics, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
10  Department of Physics, University of Lund, Sölvegatan 14, 223 63 Lund, Sweden
11  Dipartimento di Fisica, Univ. di Milano-Bicocca and INFN-MILANO, Piazza delle Scienze 2, 20126 Milan, Italy
12  Dipartimento di Fisica Sperimentale, Università di Torino and INFN, Via P. Giuria 1, 10125 Turin, Italy
13  Univ. Federal do Rio de Janeiro, C.P. 68528 Cidade Univ., Ilha do Fundão 21945-970 Rio de Janeiro, Brazil
14  Dipartimento di Fisica, Università di Padova and INFN, Via Marzolo 8, 35131 Padua, Italy
15  Dipartimento di Fisica, Università di Milano and INFN-MILANO, Via Celoria 16, 20133 Milan, Italy
16  Université Claude Bernard de Lyon, IPNL, IN2P3-CNRS, 69622 Villeurbanne Cedex, France
17  Institut des Sciences Nucléaires, IN2P3-CNRS, Université de Grenoble 1, 38026 Grenoble Cedex, France
18  Fysikum, Stockholm University, Box 6730, 113 85 Stockholm, Sweden
19  Université de Paris-Sud, Lab. de l'Accélérateur Linéaire, IN2P3-CNRS, Bât. 200, 91405 Orsay Cedex, France
20  Joint Institute for Nuclear Research, Dubna, Head Post Office, P.O. Box 79, 101 000 Moscow, Russian Federation
21  Dipartimento di Fisica, Università di Roma III and INFN, Via della Vasca Navale 84, 00146 Rome, Italy
22  Fachbereich Physik, University of Wuppertal, Postfach 100 127, 42097 Wuppertal, Germany
23  Centro Brasileiro de Pesquisas Físicas, rua Xavier Sigaud 150, 22290 Rio de Janeiro, Brazil and Depto. de Física, Pont. Univ. Católica, C.P. 38071 22453 Rio de Janeiro, Brazil and Inst. de Física, Univ. Estadual do Rio de Janeiro, rua São Francisco Xavier 524, Rio de Janeiro, Brazil
24  National Technical University, Physics Department, Zografou Campus, 15773 Athens, Greece
25  Dipartimento di Fisica, Università di Bologna and INFN, Via Irnerio 46, 40126 Bologna, Italy
26  DAPNIA/Service de Physique des Particules, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
27  Institut de Recherches Subatomiques, IN2P3 - CNRS/ULP - BP20, 67037 Strasbourg Cedex, France
28  NIKHEF, Postbus 41882, 1009 DB Amsterdam, The Netherlands
29  School of Physics and Chemistry, University of Landcaster, Lancaster LA1 4YB, UK
30  Department of Radiation Sciences, University of Uppsala, P.O. Box 535, 751 21 Uppsala, Sweden
31  J. Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia and Laboratory for Astroparticle Physics, Nova Gorica Polytechnic, Kostanjeviska 16a, 5000 Nova Gorica, Slovenia, and Department of Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
32  Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
33  Institute of Nuclear Physics,Ul. Kawiory 26a, 30055 Krakow, Poland
34  Collège de France, Lab. de Physique Corpusculaire, IN2P3-CNRS, 75231 Paris Cedex 05, France
35  Physics Department, University of Oslo, Blindern, 1000 Oslo 3, Norway
36  Dipartimento di Fisica, Università di Roma II and INFN, Tor Vergata, 00173 Rome, Italy
37  Inst. for High Energy Physics, Serpukov P.O. Box 35, Protvino, (Moscow Region), Russian Federation
38  Dipartimento di Fisica, Università di Genova and INFN, Via Dodecaneso 33, 16146 Genova, Italy
39  Dipartimento di Fisica, Università di Trieste and INFN, Via A. Valerio 2, 34127 Trieste, Italy and Istituto di Fisica, Università di Udine, 33100 Udine, Italy
40  IFIC, Valencia-CSIC, and D.F.A.M.N., U. de Valencia, Avda. Dr. Moliner 50, 46100 Burjassot (Valencia), Spain
41  Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, UK
42  Dpto. Fisica, Univ. Oviedo, Avda. Calvo Sotelo s/n, 33007 Oviedo, Spain
43  Inst. Nuclear Studies and University of Warsaw, Ul. Hoza 69, 00681 Warsaw, Poland
44  Department of Physics, University of Bergen, Allégaten 55, 5007 Bergen, Norway
45  Instituto de Fisica de Cantabria (CSIC-UC), Avda. los Castros s/n, 39006 Santander, Spain
46  Helsinki Institute of Physics, HIP, P.O. Box 9, 00014 Helsinki, Finland
47  Physics Laboratory, University of Athens, Solonos Str. 104, 10680 Athens, Greece
48  IPNP of MFF, Charles Univ., Areal MFF, V Holesovickach 2, 180 00, Praha 8, Czech Republic
49  Now at DESY-Zeuthen, Platanenallee 6, 15735 Zeuthen, Germany
50  Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, 30055 Krakow, Poland

(Received: 10 August 2001 / Published online: 5 November 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
Technicolor represents a viable alternative to the Higgs mechanism for generating gauge boson masses. Searches for technicolor particles $\rho_T$ and $\pi_T$ have been performed in the data collected by the DELPHI experiment at LEP at centre-of-mass energies between 192 and 208 GeV corresponding to an integrated luminosity of 452 pb -1. Good agreement is observed with the SM expectation in all channels studied. This is translated into an excluded region in the $(M_{\pi_T},M_{\rho_T})$ plane. The $\rho_T$ production is excluded for all $90 < M_{\rho_T}<206.7$ GeV/c 2. Assuming a point-like interaction of the $\pi_T$ with gauge bosons, an absolute lower limit on the charged $\pi_T$ mass at 95% CL is set at 79.8 GeV/c 2, independently of other parameters of the technicolor model.



© Società Italiana di Fisica, Springer-Verlag 2001