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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Guy Wilkinson

Professor of Physics

Sub department

  • Particle Physics

Research groups

  • LHCb
Guy.Wilkinson@physics.ox.ac.uk
Telephone: 01865 (2)83110
Denys Wilkinson Building, room 608a
  • About
  • Publications

π±, K±, p and (p)over-bar production in Z0→q(q)over-bar, Z0→b(b)over-bar, Z0→u(u)over-bar,d(d)over-bar,s(s)over-bar

EUROPEAN PHYSICAL JOURNAL C 5:4 (1998) 585-620

Authors:

P Abreu, W Adam, T Adye, P Adzic, I Ajinenko, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, EG Anassontzis, P Andersson, A Andreazza, 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, K Belous, AC Benvenuti, C Berat, M Berggren, D Bertini, D Bertrand, M Besancon, F Bianchi, M Bigi, MS Bilenky, MA Bizouard, D Bloch, 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, AJC Rozas, T Camporesi, V Canale, M Canepa, F Carena, L Carroll, C Caso, MVC Gimenez, A Cattai, FR Cavallo, C Cerruti, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, M Chen, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, P Collins, M Colomer, R Contri, E Cortina, G Cosme, F Cossutti, JH Cowell, HB Crawley, D Crennell, G Crosetti, JC Maestro, S Czellar, B Dalmagne, 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 Clerq, B De Lotto, A De Min, L De Paula, H Dijkstra, L Di Ciaccio, A Di Diodato, A Djannati, J Dolbeau, K Doroba, M Dracos, J Drees, KA Drees, M Dris, A Duperrin, JD Durand, R Ehret, 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, P Ferrari, A Ferrer, S Fichet, A Firestone, PA Fischer, U Flagmeyer, H Foeth, E Fokitis, F Fontanelli, B Franek, AG Frodesen, R Fruhwirth, F Fulda-Quenzer, J Fuster, A Galloni, D Gamba, M Gandelman, C Garcia, J Garcia, C Gaspar, M Gaspar, U Gasparini, P Gavillet, EN Gazis, D Gele, JP Gerber, L Gerdyukov, N Ghodbane, I Gil, F Glege, R Gokieli, B Golob, P Goncalves, IG Caballero, G Gopal, L Gorn, M Gorski, Y Gouz, V Gracco, J Grahl, E Graziani, C Green, A Grefrath, P Gris, K Grzelak, M Gunther, J Guy, F Hahn, S Hahn, S Haider, A Hallgren, K Hamacher, FJ Harris, V Hedberg, S Heising, R Henriques, JJ Hernandez, P Herquet, H Herr, TL Hessing, JM Heuser, E Higon, SO Holmgren, PJ Holt, D Holthuizen, S Hoorelbeke, M Houlden, K Huet, 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, BA Khomenko, NN Khovanski, A Kiiskinen, B King, NJ Kjaer, O Klapp, H Klein, P Kluit, D Knoblauch, P Kokkinias, M Koratzinos, C Kourkoumelis, O Kouznetsov, M Krammer, C Kreuter, E Kriznic, Z Krumstein, P Kubinec, W Kucewicz, K Kurvinen, JW Lamsa, L Lanceri, DW Lane, P Langefeld, V Lapin, JP Laugier, R Lauhakangas, G Leder, F Ledroit, V Lefebure, L Leinonen, A Leisos, R Leitner, J Lemonne, 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, SM Garcia, F Matorras, C Matteuzzi, G Matthiae, F Mazzucato, M Mazzucato, M McCubbin, R McKay, R McNulty, G McPherson, C Meroni, WT Meyer, A Miagkov, E Migliore, L Mirabito, WA Mitaroff, U Mjoernmark, T Moa, R Moeller, K Moenig, MR Monge, X Moreau, P Morettini, G Morton, 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, S Nemecek, N Neufeld, W Neumann, N Neumeister, R Nicolaidou, BS Nielsen, M Nieuwenhuizen, V Nikolaenko, M Nikolenko, V Nomokonov, A Normand, A Nygren, V Obraztsov, AG Olshevski, A Onofre, R Orava, G Orazi, K Osterberg, A Ouraou, P Paganini, 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, M Pegoraro, L Peralta, M Pernicka, A Perrotta, C Petridou, A Petrolini, HT Phillips, G Piana, 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, J Rames, 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, 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, V Senko, RC Shellard, A Sheridan, R Silvestre, L Simard, F Simonetto, AN Sisakian, TB Skaali, G Smadja, O Smirnova, GR Smith, O Solovianov, A Sopczak, R Sosnowski, T Spassov, E Spiriti, P Sponholz, S Squarcia, D Stampfer, C Stanescu, S Stanic, S Stapnes, K Stevenson, A Stocchi, J Strauss, R Strub, B Stugu, M Szczekowski, M Szeptycka, T Tabarelli, F Tegenfeldt, F Terranova, J Thomas, A Tilquin, J Timmermans, LG Tkatchev, T Todorov, S Todorova, DZ Toet, A Tomaradze, B Tome, A Tonazzo, L Tortora, G Transtromer, D Treille, G Tristram, A Trombini, C Troncon, A Tsirou, ML Turluer, IA Tyapkin, S Tzamarias, B Ueberschaer, O Ullaland, V Uvarov, G Valenti, E Vallazza, C Vander Velde, 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, N Vishnevsky, L Vitale, E Vlasov, AS Vodopyanov, G Voulgaris, V Vrba, H Wahlen, C Walck, C Weiser, AM Wetherell, D Wicke, JH Wickens, GR Wilkinson, M Winter, M Witek, T Wlodek, G Wolf, J Yi, O Yushchenko, A Zaitsev, A Zalewska, P Zalewski, D Zavrtanik, E Zevgolatakos, NI Zimin, GC Zucchelli, G Zumerle
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Measurement of the triple gluon vertex from double quark tagged 4-jet events

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 414:3-4 (1997) 401-418

Authors:

P Abreu, W Adam, T Adye, P Adzic, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, P Andersson, A Andreazza, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, M Barbi, G Barbiellini, DY Bardin, G Barker, A Baroncelli, O Barring, MJ Bates, M Battaglia, M Baubillier, J Baudot, 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, P Billoir, MA Bizouard, D Bloch, M Blume, M Bonesini, W Bonivento, M Boonekamp, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, M Bozzo, P Branchini, KD Brand, T Brenke, RA Brenner, RCA Brown, 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, M Canepa, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, M Chen, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, V Cindro, P Collins, M Colomer, R Contri

Abstract:

The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b-or c-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from double-gluon brems Strahlung, the triple-gluon vertex, and secondary quark-antiquark pair production then yield significantly different two-dimensional distributions in the generalized Nachtmann Reiter angle versus the opening angle of the two secondary jets. These distributions are used to fit CA/CF, the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung, and NC/NA, the ratio of the number of quark colours to the number of gluons, giving CA/CF = 2.51 ± 0.28 and NC/NA = 0.38 ∓ 0.10 in agreement with the values expected from QCD: CA/CF= 9/4 = 2.25 and NC/NA = 3/8 = 0.375. © 1997 Published by Elsevier Science B.V.
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Search for B0s-B0s oscillations

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 414:3-4 (1997) 382-400

Authors:

W Adam, T Adye, I Ajinenko, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, P Andersson, A Andreazza, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, M Barbi, DY Bardin, G Barker, A Baroncelli, O Barring, MJ Bates, M Battaglia, M Baubillier, J Baudot, 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, P Billoir, MA Bizouard, D Bloch, M Blume, 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 Bozovic, M Bozzo, P Branchini, KD Brand, T Brenke, RA Brenner, RCA Brown, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, A Camacho Rozas, T Camporesi, V Canale, M Canepa, 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, M Chen, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, V Cindro, P Collins, M Colomer

Abstract:

Oscillations of B0s mesons were studied in events with a large transverse momentum lepton selected from 3.2 million hadronic Z0 decays registered by DELPHI between 1991 and 1994. A limit on the mass difference between the physical B0s states Δms > 6.5ps-1 at 95% C.L. was obtained by combining the results obtained in three channels. © 1997 Published by Elsevier Science B.V.
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Observation of charge-ordering in particle production in hadronic Z0 decay

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 407:2 (1997) 174-184

Authors:

P Abreu, W Adam, T Adye, P Adzic, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, P Andersson, A Andreazza, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, M Barbi, G Barbiellini, DY Bardin, G Barker, A Baroncelli, O Barring, MJ Bates, M Battaglia, M Baubillier, J Baudot, 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, P Billoir, MA Bizouard, D Bloch, M Blume, M Bonesini, W Bonivento, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, M Bozzo, P Branchini, KD Brand, T Brenke, RA Brenner, C Bricman, RCA Brown, P Bruckman, JM Brunei, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, A Camacho Rozas, T Camporesi, V Canale, M Canepa, F Cao, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, V Chabaud, P Charpentier, L Chaussard, P Checchia, GA Chelkov, M Chen, R Chierici, P Chliapnikov, P Chochula, V Chorowicz, J Chudoba, V Cindro, P Collins, R Contri

Abstract:

Analysis of the rapidity structure of charge correlations in hadronic events from Z0 decays gives evidence for chain-like charge-ordering of particle production along the thrust axis, as predicted by 'QCD-motivated string-like fragmentation models. © 1997 Published by Elsevier Science B.V.
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Measurement of the spin density matrix for the ρ0, K*0(892) and φ produced in Z0 decays

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 406:3 (1997) 271-286

Authors:

P Abreu, W Adam, T Adye, GD Alekseev, R Alemany, PP Allport, S Almehed, U Amaldi, S Amato, P Andersson, A Andreazza, P Antilogus, WD Apel, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, M Barbi, G Barbiellini, DY Bardin, G Barker, A Baroncelli, O Barring, MJ Bates, M Battaglia, M Baubillier, J Baudot, 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, P Billoir, MA Bizouard, D Bloch, M Blume, M Bonesini, W Bonivento, PSL Booth, AW Borgland, G Borisov, C Bosio, O Botner, E Boudinov, B Bouquet, C Bourdarios, TV Bowcock, M Bozzo, P Branchini, KD Brand, T Brenke, RA Brenner, C Bricman, RCA Brown, P Bruckman, JM Brunet, L Bugge, T Buran, T Burgsmueller, P Buschmann, S Cabrera, M Caccia, M Calvi, A Camacho Rozas, T Camporesi, V Canale, M Canepa, F Cao, 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, M Chen, R Chierici, P Chliapnikov, P Chochula, Y Chorowicz, J Chudoba, V Cindro, PP Collins, R Contri

Abstract:

The spin density matrix elements for the ρ0, K*0(892) and φ produced in hadronic Z0 decays are measured in the DELPHI detector. There is no evidence for spin alignment of the K*0(892) and φ in the region xp ≤ 0.3 (xp = p/pbeam), where ρ00 = 0.33 ± 0.05 and ρ00 = 0.30 ± 0.04, respectively. In the fragmentation region, xp ≥ 0.4, there is some indication for spin alignment of the ρ0 and K*0(892), since ρ00 = 0.43 ± 0.05 and ρ00 = 0.46 ± 0.08, respectively. These values are compared with those found in meson-induced hadronic reactions. For the φ, ρ00 = 0.30 ± 0.04 for xp ≥ 0.4 and 0.55 ± 0.10 for xp ≥ 0.7. The off-diagonal spin density matrix element ρ1 - 1 is consistent with zero in all cases.© 1997 Published by Elsevier Science B.V.
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