Guy Wilkinson: Publications

Study of the four-jet anomaly observed at LEP centre-of-mass energies of 130 and 136 GeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 448:3-4 (1999) 311-319

Authors:

P Abreu, W Adam, T Adye, P Adzic, I Ajinenko, Z Albrecht, T Alderweireld, GD Alekseev, R Alemany, T Allmendinger, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Asman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, AJ Camacho Rozas, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, P Collins, R Contri, E Cortina, G Cosme

Abstract:

The four-jet events collected by DELPHI during the special LEP run at centre-of-mass energies of 130 and 136 GeV in 1997 with an integrated luminosity of 5.9pb-1 are analysed. Their rate and the distributions of their di-jet masses, their smallest jet charges, and their di-jet charge separations all agree well with Standard Model predictions. Thus the hypothesis of pair production of a new particle with a sum of di-jet masses around 105 GeV/c2 is not 91̽��ed. The combined result of the four LEP collaborations refuting this hypothesis at over 99% confidence level is also given. © 1999 Published by Elsevier Science B.V. All rights reserved.

The scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of CA/CF

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 449:3-4 (1999) 383-400

Authors:

P Abreu, W Adam, T Adye, P Adzic, I Ajinenko, Z Albrecht, T Alderweireld, GD Alekseev, R Alemany, T Allmendinger, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, AJ Camacho Rozas, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, P Collins, R Contri, E Cortina, G Cosme

Abstract:

Data collected at the Z resonance using the DELPHI detector at LEP are used to determine the charged hadron multiplicity in gluon and quark jets as a function of a transverse momentum-like scale. The colour factor ratio, CA/CF, is directly observed in the increase of multiplicities with that scale. The smaller than expected multiplicity ratio in gluon to quark jets is understood by differences in the hadronization of the leading quark or gluon. From the dependence of the charged hadron multiplicity on the opening angle in symmetric three-jet events the colour factor ratio is measured to be: CA/CF = 2.246 ± 0.062(stat.) ± 0.080 (syst.) ± 0.095 (theo.) © 1999 Elsevier Science B.V. All rights reserved.

W pair production cross-section and W branching fractions in e⁺e^- interactions at 183 GeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 456:2-4 (1999) 310-321

Authors:

P Abreu, W Adam, T Adye, P Adzic, Z Albrecht, T Alderweireld, GD Alekseev, R Alemany, T Allmendinger, PP Allport, S Almehed, U Amaldi, N Amapane, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Asman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, A Behrmann, P Beilliere, Y Belokopytov, K Belous, NC Benekos, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, B Buschbeck, P Buschmann, S Cabrera, M Caccia, M Calvi, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, M Chapkin, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba

Abstract:

The cross-section for the process e+e-→W+W- has been measured with the data sample collected by DELPHI at an average centre-of-mass energy of 182.65 GeV and corresponding to an integrated luminosity of 53 pb-1. Based on the 770 events selected as WW candidates, the cross-section for the doubly resonant process δ(e+e-→W+W-) = 15.86 ± 0.69 (stat) ± 0.26 (syst)pb has been measured and found to be in good agreement with the Standard Model expectation. The branching fractions of the W decay were also measured. From these a value of the CKM mixing matrix element \Vcs\ = 0.985 ± 0.073 (stat) ± 0.025 (syst) was derived. Our previously published WW cross-section measurements and the derived measurement of mW have been revised and updated with the present cross-section measurement to yield mW = 80.49 ± 0.43(stat) ± 0.09(syst) ± 0.03(LEP)GeV/c2. © 1999 Published by Elsevier Science B.V. All rights reserved.

A precise measurement of the partial decay width ratio R_b⁰ = Γ_b(b)over-bar/Γ_had

EUROPEAN PHYSICAL JOURNAL C 10:3 (1999) 415-442

Authors:

P Abreu, W Adam, T Adye, P Adzic, Z Albrecht, T Alderweireld, GD Alekseev, R Alemany, T Allmendinger, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, S Andringa, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, R Barbier, DY Bardin, G Barker, A Baroncelli, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, K Belous, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, HM Blom, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, I Boyko, I Bozovic, M Bozzo, P Branchini, T Brenke, RA Brenner, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, T Camporesi, V Canale, F Carena, L Carroll, C Caso, MVC Gimenez, A Cattai, FR Cavallo, V Chabaud, M Chapkin, P Charpentier, L Chaussard, P Checchia, GA Chelkov, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, K Cieslik, P Collins, R Contri, E Cortina, G Cosme, F Cossutti, JH Cowell, HB Crawley, D Crennell, S Crepe, G Crosetti, JC Maestro, S Czellar, G Damgaard, M Davenport, W Da Silva, A Deghorain, G Della Ricca, P Delpierre, N Demaria, A De Angelis, W De Boer, S De Brabandere, C De Clercq, B De Lotto, A De Min, L De Paula, H Dijkstra, L Di Ciaccio, J Dolbeau, K Doroba, M Dracos, J Drees, M Dris, A Duperrin, JD Durand, G Eigen, T Ekelof, G Ekspong, M Ellert, M Elsing, JP Engel, B Erzen, ME Santo, E Falk, G Fanourakis, D Fassouliotis, J Fayot, M Feindt, A Fenyuk, P Ferrari, A Ferrer, E Ferrer-Ribas, S Fichet, A Firestone, U Flagmeyer, H Foeth, E Fokitis, F Fontanelli, B Franek, AG Frodesen, R Fruhwirth, F Fulda-Quenzer, J Fuster, A Galloni, D Gamba, S Gamblin, M Gandelman, C Garcia, C Gaspar, M Gaspar, U Gasparini, P Gavillet, EN Gazis, D Gele, N Ghodbane, I Gil, F Glege, R Gokieli, B Golob, G Gomez-Ceballos, P Goncalves, IG Caballero, G Gopal, L Gorn, M Gorski, Y Gouz, V Gracco, J Grahl, E Graziani, C Green, HJ Grimm, P Gris, G Grosdidier, K Grzelak, M Gunther, J Guy, F Hahn, S Hahn, S Haider, A Hallgren, K Hamacher, J Hansen, FJ Harris, V Hedberg, S Heising, JJ Hernandez, P Herquet, H Herr, TL Hessing, JM Heuser, E Higon, SO Holmgren, PJ Holt, S Hoorelbeke, M Houlden, K Huet, GJ Hughes, K Hultqvist, JN Jackson, R Jacobsson, P Jalocha, R Janik, C Jarlskog, G Jarlskog, P Jarry, B Jean-Marie, EK Johansson, P Jonsson, C Joram, P Juillot, F Kapusta, K Karafasoulis, S Katsanevas, EC Katsoufis, R Keranen, BP Kersevan, BA Khomenko, NN Khovanski, A Kiiskinen, B King, A Kinvig, NJ Kjaer, O Klapp, H Klein, P Kluit, P Kokkinias, M Koratzinos, V Kostioukhine, C Kourkoumelis, O Kouznetsov, M Krammer, E Kriznic, J Krstic, Z Krumstein, P Kubinec, J Kurowska, K Kurvinen, JW Lamsa, DW Lane, P Langefeld, V Lapin, JP Laugier, R Lauhakangas, G Leder, F Ledroit, V Lefebure, L Leinonen, A Leisos, R Leitner, G Lenzen, V Lepeltier, T Lesiak, M Lethuillier, J Libby, D Liko, A Lipniacka, I Lippi, B Loerstad, JG Loken, JH Lopes, JM Lopez, R Lopez-Fernandez, D Loukas, P Lutz, L Lyons, J MacNaughton, JR Mahon, A Maio, A Malek, TGM Malmgren, V Malychev, F Mandl, J Marco, R Marco, B Marechal, M Margoni, JC Marin, C Mariotti, A Markou, C Martinez-Rivero, F Martinez-Vidal, SMI Garcia, J Masik, N Mastroyiannopoulos, F Matorras, C Matteuzzi, G Matthiae, F Mazzucato, M Mazzucato, M Mc Cubbin, R Mc Kay, R Mc Nulty, G Mc Pherson, C Meroni, WT Meyer, E Migliore, L Mirabito, WA Mitaroff, U Mjoernmark, T Moa, M Moch, R Moeller, K Moenig, MR Monge, X Moreau, P Morettini, G Morton, U Mueller, K Muenich, M Mulders, C Mulet-Marquis, R Muresan, WJ Murray, B Muryn, G Myatt, T Myklebust, F Naraghi, FL Navarria, S Navas, K Nawrocki, P Negri, N Neufeld, N Neumeister, R Nicolaidou, BS Nielsen, M Nikolenko, V Nomokonov, A Normand, A Nygren, V Obraztsov, AG Olshevski, A Onofre, R Orava, G Orazi, K Osterberg, A Ouraou, M Paganoni, S Paiano, R Pain, R Paiva, J Palacios, H Palka, TD Papadopoulou, K Papageorgiou, L Pape, C Parkes, F Parodi, U Parzefall, A Passeri, O Passon, M Pegoraro, L Peralta, M Pernicka, A Perrotta, C Petridou, A Petrolini, HT Phillips, F Pierre, M Pimenta, E Piotto, T Podobnik, ME Pol, G Polok, P Poropat, V Pozdniakov, P Privitera, N Pukhaeva, A Pullia, D Radojicic, S Ragazzi, H Rahmani, D Rakoczy, PN Ratoff, AL Read, P Rebecchi, NG Redaelli, M Regler, D Reid, R Reinhardt, PB Renton, LK Resvanis, F Richard, J Ridky, G Rinaudo, O Rohne, A Romero, P Ronchese, EI Rosenberg, P Rosinsky, P Roudeau, T Rovelli, C Royon, V Ruhlmann-Kleider, A Ruiz, H Saarikko, Y Sacquin, A Sadovsky, G Sajot, J Salt, D Sampsonidis, M Sannino, H Schneider, P Schwemling, U Schwickerath, MAE Schyns, F Scuri, P Seager, Y Sedykh, AM Segar, R Sekulin, RC Shellard, A Sheridan, M Siebel, L Simard, F Simonetto, AN Sisakian, G Smadja, N Smirnov, O Smirnova, GR Smith, A Sopczak, R Sosnowski, T Spassov, E Spiriti, P Sponholz, S Squarcia, D Stampfer, C Stanescu, S Stanic, K Stevenson, A Stocchi, J Strauss, R Strub, B Stugu, M Szczekowski, M Szeptycka, T Tabarelli, F Tegenfeldt, F Terranova, J Thomas, J Timmermans, N Tinti, LG Tkatchev, S Todorova, A Tomaradze, B Tome, A Tonazzo, L Tortora, G Transtromer, D Treille, G Tristram, M Trochimczuk, C Troncon, A Tsirou, ML Turluer, IA Tyapkin, S Tzamarias, B Ueberschaer, O Ullaland, V Uvarov, G Valenti, E Vallazza, GW Van Apeldoorn, P Van Dam, WK Van Doninck, J Van Eldik, A Van Lysebetten, I Van Vulpen, N Vassilopoulos, G Vegni, L Ventura, W Venus, F Verbeure, M Verlato, LS Vertogradov, V Verzi, D Vilanova, L Vitale, E Vlasov, AS Vodopyanov, C Vollmer, G Voulgaris, V Vrba, H Wahlen, C Walck, C Weiser, D Wicke, JH Wickens, GR Wilkinson, M Winter, M Witek, G Wolf, J Yi, O Yushchenko, A Zaitsev, A Zalewska, P Zalewski, D Zavrtanik, E Zevgolatakos, NI Zimin, GC Zucchelli, G Zumerle

Calibration of centre-of-mass energies at LEP1 for precise measurements of Z properties

EUROPEAN PHYSICAL JOURNAL C 6:2 (1999) 187-223

Authors:

R Assmann, M Böge, R Billen, A Blondel, E Bravin, P Bright-Thomas, T Camporesi, B Dehning, A Drees, G Duckeck, J Gascon, M Geitz, B Goddard, CM Hawkes, K Henrichsen, MD Hildreth, A Hofmann, R Jacobsen, M Koratzinos, M Lamont, E Lancon, A Lucotte, J Mnich, G Mugnai, E Peschardt, M Placidi, P Puzo, G Quast, P Renton, L Rolandi, H Wachsmuth, PS Wells, J Wenninger, G Wilkinson, T Wyatt, J Yamartino, K Yip

91̽��

Guy Wilkinson

Sub department

Study of the four-jet anomaly observed at LEP centre-of-mass energies of 130 and 136 GeV

Authors:

Abstract:

The scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of CA/CF

Authors:

Abstract:

W pair production cross-section and W branching fractions in e⁺e^- interactions at 183 GeV

Authors:

Abstract:

A precise measurement of the partial decay width ratio R_b⁰ = Γ_b(b)over-bar/Γ_had

Authors:

Calibration of centre-of-mass energies at LEP1 for precise measurements of Z properties

Authors:

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91̽��

Guy Wilkinson

Sub department

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Study of the four-jet anomaly observed at LEP centre-of-mass energies of 130 and 136 GeV

Authors:

Abstract:

The scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of CA/CF

Authors:

Abstract:

W pair production cross-section and W branching fractions in e+e- interactions at 183 GeV

Authors:

Abstract:

A precise measurement of the partial decay width ratio Rb0 = Γb(b)over-bar/Γhad

Authors:

Calibration of centre-of-mass energies at LEP1 for precise measurements of Z properties

Authors:

W pair production cross-section and W branching fractions in e⁺e^- interactions at 183 GeV

A precise measurement of the partial decay width ratio R_b⁰ = Γ_b(b)over-bar/Γ_had