Guy Wilkinson: Publications

J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z

PHYSICS LETTERS B 341:1 (1994) 109-122

Authors:

P ABREU, W ADAM, T ADYE, E AGASI, I AJINENKO, R ALEKSAN, GD ALEKSEEV, PP ALLPORT, S ALMEHED, FML ALMEIDA, SJ ALVSVAAG, U AMALDI, A ANDREAZZA, P ANTILOGUS, WD APEL, RJ APSIMON, Y ARNOUD, B ASMAN, JE AUGUSTIN, A AUGUSTINUS, P BAILLON, P BAMBADE, F BARAO, R BARATE, G BARBIELLINI, DY BARDIN, GJ BARKER, A BARONCELLI, O BARRING, JA BARRIO, W BARTL, MJ BATES, M BATTAGLIA, M BAUBILLIER, J BAUDOT, KH BECKS, M BEGALLI, P BEILLIERE, P BELTRAN, AC BENVENUTI, M BERGGREN, D BERTRAND, F BIANCHI, M BIGI, MS BILENKY, P BILLOIR, J BJARNE, D BLOCH, J BLOCKI, S BLYTH, V BOCCI, PN BOGOLUBOV, T BOLOGNESE, M BONESINI, W BONIVENTO, PSL BOOTH, G BORISOV, C BOSIO, B BOSTJANCIC, S BOSWORTH, O BOTNER, B BOUQUET, C BOURDARIOS, TJV BOWCOCK, M BOZZO, S BRAIBANT, P BRANCHINI, KD BRAND, RA BRENNER, H BRIAND, C BRICMAN, L BRILLAULT, RCA BROWN, P BRUCKMAN, JM BRUNET, L BUGGE, T BURAN, A BUYS, JAMA BUYTAERT, M CACCIA, M CALVI, AJC ROZAS, R CAMPION, T CAMPORESI, V CANALE, K CANKOCAK, F CAO, F CARENA, P CARRILHO, L CARROLL, R CASES, C CASO, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, V CHABAUD, A CHAN, M CHAPKIN, P CHARPENTIER, L CHAUSSARD, J CHAUVEAU, P CHECCHIA, GA CHELKOV, P CHLIAPNIKOV, V CHOROWICZ, JTM CHRIN, V CINDRO, P COLLINS, JL CONTRERAS, R CONTRI, E CORTINA, G COSME, F COUCHOT, HB CRAWLEY, D CRENNELL, G CROSETTI, JC MAESTRO, S CZELLAR, E DAHLJENSEN, J DAHM, B DALMAGNE, M DAM, G DAMGAARD, E DAUBIE, A DAUM, PD DAUNCEY, M DAVENPORT, J DAVIES, W DASILVA, C DEFOIX, P DELPIERRE, N DEMARIA, A DEANGELIS, H DEBOECK, W DEBOER, S DEBRABANDERE, C DECLERCQ, MDMD LASO, C DELAVAISSIERE, B DELOTTO, A DEMIN, L DEPAULA, C DESAINTJEAN, H DIJKSTRA, L DICIACCIO, F DJAMA, J DOLBEAU, M DONSZELMANN, K DOROBA, M DRACOS, J DREES, M DRIS, Y DUFOUR, F DUPONT, D EDSALL, R EHRET, T EKELOF, G EKSPONG, M ELSING, JP ENGEL, N ERSHAIDAT, ME SANTO, D FASSOULIOTIS, M FEINDT, A FERRER, TA FILIPPAS, A FIRESTONE, H FOETH, E FOKITIS, F FONTANELLI, F FORMENTI, JL FOUSSET, B FRANEK, P FRENKIEL, DC FRIES, AG FRODESEN, R FRUHWIRTH, E FULDAQUENZER, H FURSTENAU, J FUSTER, D GAMBA, M GANDELMAN, C GARCIA, J GARCIA, C GASPAR, U GASPARINI, P GAVILLET, EN GAZIS, D GELE, JP GERBER, P GIACOMELLI, D GILLESPIE, R GOKIELI, B GOLOB, VM GOLOVATYUK, JJGY CADENAS, G GOPAL, L GORN, M GORSKI, V GRACCO, F GRARD, E GRAZIANI, G GROSDIDIER, P GUNNARSSON, J GUY, U HAEDINGER, F HAHN, M HAHN, S HAHN, S HAIDER, Z HAJDUK, A HAKANSSON, A HALLGREN, K HAMACHER, W HAO, FJ HARRIS, V HEDBERG, R HENRIQUES, JJ HERNANDEZ, JA HERNANDO, P HERQUET, H HERR, TL HESSING, E HIGON, HJ HILKE, TS HILL, SO HOLMGREN, PJ HOLT, D HOLTHUIZEN, PF HONORE, M HOULDEN, K HUET, K HULTQVIST, P IOANNOU, PS IVERSEN, JN JACKSON, R JACOBSSON, P JALOCHA, G JARLSKOG, P JARRY, B JEANMARIE, EK JOHANSSON, M JONKER, L JONSSON, P JUILLOT, M KAISER, G KALMUS, F KAPUSTA, M KARLSSON, E KARVELAS, A KATARGIN, S KATSANEVAS, EC KATSOUFIS, R KERANEN, BA KHOMENKO, NN KHOVANSKI, B KING, NJ KJAER, H KLEIN, A KLOVNING, P KLUIT, A KOCHMEHRIN, JH KOEHNE, B KOENE, P KOKKINIAS, M KORATZINOS, AV KORYTOV, V KOSTIOUKHINE, C KOURKOUMELIS, O KOUZNETSOV, PH KRAMER, M KRAMMER, C KREUTER, J KROLIKOWSKI, I KRONKVIST, W KRUPINSKI, W KUCEWICZ, K KULKA, K KURVINEN, C LACASTA, I LAKTINEH, C LAMBROPOULOS, JW LAMSA, L LANCERI, P LANGEFELD, V LAPIN, I LAST, JP LAUGIER, R LAUHAKANGAS, G LEDER, F LEDROIT, R LEITNER, Y LEMOIGNE, J LEMONNE, G LENZEN, V LEPELTIER, T LESIAK, JM LEVY, E LIEB, D LIKO, R LINDNER, A LIPNIACKA, I LIPPI, B LOERSTAD, M LOKAJICEK, JG LOKEN, A LOPEZFERNANDEZ, MAL AGUERA, M LOS, D LOUKAS, JJ LOZANO, P LUTZ, L LYONS, G MAEHLUM, J MAILLARD, A MAIO, A MALTEZOS, F MANDL, J MARCO, B MARECHAL, M MARGONI, JC MARIN, C MARIOTTI, A MARKOU, T MARON, S MARTI, C MARTINEZRIVERO, F MARTINEZVIDAL, F MATORRAS, C MATTEUZZI, G MATTHIAE, M MAZZUCATO, M MCCUBBIN, R MCKAY, R MCNULTY, J MEDBO, C MERONI, WT MEYER, M MICHELOTTO, E MIGLIORE, I MIKULEC, L MIRABITO, WA MITAROFF, GV MITSELMAKHER, U MJOERNMARK, T MOA, R MOELLER, K MOENIG, MR MONGE, P MORETTINI, H MUELLER, WJ MURRAY, B MURYN, G MYATT, F NARAGHI, FL NAVARRIA, P NEGRI, S NEMECEK, W NEUMANN, N NEUMEISTER, R NICOLAIDOU, BS NIELSEN, V NIKOLAENKO, P NISS, A NOMEROTSKI, A NORMAND, V OBRAZTSOV, AG OLSHEVSKI, R ORAVA, K OSTERBERG, A OURAOU, P PAGANINI, M PAGANONI, R PAIN, H PALKA, TD PAPADOPOULOU, L PAPE, F PARODI, A PASSERI, M PEGORARO, J PENNANEN, L PERALTA, H PERNEGGER, M PERNICKA, A PERROTTA, C PETRIDOU, A PETROLINI, HT PHILLIPS, G PIANA, F PIERRE, M PIMENTA, S PLASZCZYNSKI, O PODOBRIN, ME POL, G POLOK, P POROPAT, V POZDNIAKOV, M PREST, P PRIVITERA, A PULLIA, D RADOJICIC, S RAGAZZI, H RAHMANI, J RAMES, PN RATOFF, AL READ, M REALE, P REBECCHI, NG REDAELLI, M REGLER, D REID, PB RENTON, LK RESVANIS, F RICHARD, J RICHARDSON, J RIDKY, G RINAUDO, I RIPP, A ROMERO, I RONCAGLIOLO, P RONCHESE, L ROOS, EI ROSENBERG, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANNKLEIDER, A RUIZ, H SAARIKKO, Y SACQUIN, G SAJOT, J SALT, J SANCHEZ, M SANNINO, S SCHAEL, H SCHNEIDER, MAE SCHYNS, G SCIOLLA, E SCURI, AM SEGAR, A SEITZ, R SEKULIN, M SESSA, R SEUFERT, RC SHELLARD, I SICCAMA, P SIEGTIST, S SIMONETTI, F SIMONETTO, AN SISAKIAN, TB SKAALI, G SMADJA, N SMIRNOV, O SMIRNOVA, GR SMITH, R SOSNOWSKI, D SOUZASANTOS, T SPASSOV, E SPIRITI, S SQUARCIA, H STAECK, C STANESCU, S STAPNES, I STAVITSKI, G STAVROPOULOS, K STEPANIAK, F STICHELBAUT, A STOCCHI, J STRAUSS, J STRAVER, R STRUB, B STUGU, M SZCZEKOWSKI, M SZEPTYCKA, T TABARELLI, O TCHIKILEV, GE THEODOSIOU, Z THOME, A TILQUIN, J TIMMERMANS, VG TIMOFEEV, LG TKATCHEV, T TODOROV, DZ TOET, A TOMARADZE, B TOME, E TORASSA, L TORTORA, G TRANSTROMER, D TREILLE, W TRISCHUK, G TRISTRAM, C TRONCON, A TSIROU, EN TSYGANOV, ML TURLUER, T TUUVA, IA TYAPKIN, M TYNDEL, S TZAMARIAS, B UEBERSCHAER, S UEBERSCHAER, O ULLALAND, V UVAROV, G VALENTI, E VALLAZZA, JAV FERRER, C VANDERVELDE, GW VANAPELDOORN, P VANDAM, M VANDERHEIJDEN, WK VANDONINCK, D VANELDIK, P VAZ, G VEGNI, L VENTURA, W VENUS, F VERBEURE, M VERLATO, LS VERTOGRADOV, D VILANOVA, L VITALE, E VLASOV, AS VODOPYANOV, M VOLLMER, M VOUTILAINEN, V VRBA, H WAHLEN, C WALCK, F WALDNER, A WEHR, M WEIERSTALL, P WEILHAMMER, AM WETHERELL, JH WICKENS, M WIELERS, GR WILKINSON, WSC WILLIAMS, M WINTER, M WITEK, G WORMSER, K WOSCHNAGG, K YIP, O YUSHCHENKO, F ZACH, A ZAITSEV, A ZALEWSKA, P ZALEWSKI, D ZAVRTANIK, E ZEVGOLATAKOS, NI ZIMIN, NM ZITO, D ZONTAR, R ZUBERI, G ZUMERLE

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MEASUREMENT OF THE B0-(B0)OVER-BAR MIXING USING THE AVERAGE ELECTRIC CHARGE OF HADRON-JETS IN Z0-DECAYS

PHYSICS LETTERS B 322:4 (1994) 459-472

Authors:

P ABREU, W ADAM, T ADYE, E AGASI, I AJINENKO, R ALEKSAN, GD ALEKSEEV, A ALGERI, P ALLPORT, S ALMEHED, SJ ALVSVAAG, U AMALDI, A ANDREAZZA, P ANTILOGUS, WD APEL, RJ APSIMON, Y ARNOUD, B ASMAN, JE AUGUSTIN, A AUGUSTINUS, P BAILLON, P BAMBADE, F BARAO, R BARATE, G BARBIELLINI, DY BARDIN, GJ BARKER, A BARONCELLI, O BARRING, JA BARRIO, W BARTL, MJ BATES, M BATTAGLIA, M BAUBILLIER, KH BECKS, M BEGALLI, P BEILLIERE, Y BELOKOPYTOV, P BELTRAN, AC BENVENUTI, M BERGGREN, D BERTRAND, F BIANCHI, M BIGI, MS BILENKY, P BILLOIR, J BJARNE, D BLOCH, J BLOCKI, S BLYTH, V BOCCI, PN BOGOLUBOV, T BOLOGNESE, M BONESINI, W BONIVENTO, PSL BOOTH, G BORISOV, H BORNER, C BOSIO, B BOSTJANCIC, S BOSWORTH, O BOTNER, B BOUQUET, C BOURDARIOS, TJV BOWCOCK, M BOZZO, S BRAIBANT, P BRANCHINI, KD BRAND, RA BRENNER, H BRIAND, C BRICMAN, L BRILLAULT, RCA BROWN, P BRUCKMAN, JM BRUNET, A BUDZIAK, L BUGGE, T BURAN, H BURMEISTER, A BUYS, JAMA BUYTAERT, M CACCIA, M CALVI, AJC ROZAS, R CAMPION, T CAMPORESI, V CANALE, K CANKOCAK, F CAO, F CARENA, L CARROLL, C CASO, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, V CHABAUD, A CHAN, M CHAPKIN, P CHARPENTIER, J CHAVEAU, P CHECCHIA, GA CHELKOV, L CHEVALIER, P CHLIAPNIKOV, V CHOROWICZ, JTM CHRIN, V CINDRO, P COLLINS, JL CONTRERAS, R CONTRI, E CORTINA, G COSME, F COUCHOT, HB CRAWLEY, D CRENNELL, G CROSETTI, JC MAESTRO, S CZELLAR, E DAHLJENSEN, J DAHM, B DALMAGNE, M DAM, G DAMGAARD, E DAUBIE, A DAUM, PD DAUNCEY, M DAVENPORT, J DAVIES, W DASILVA, C DEFOIX, P DELPIERRE, N DEMARIA, A DEANGELIS, H DEBOECK, W DEBOER, S DEBRABANDERE, C DECLERCQ, MDMD LASO, C DELAVAISSIERE, B DELOTTO, A DEMIN, H DIJKSTRA, L DICIACCIO, F DJAMA, J DOLBEAU, M DONSZELMANN, K DOROBA, M DRACOS, J DREES, M DRIS, Y DUFOUR, F DUPONT, D EDSALL, LO EEK, PAM EEROLA, R EHRET, T EKELOF, G EKSPONG, AE PEISERT, M ELSING, JP ENGEL, N ERSHAIDAT, ME SANTO, D FASSOULIOTIS, M FEINDT, A FERRER, TA FILIPPAS, A FIRESTONE, H FOETH, E FOKITIS, F FONTANELLI, KAJ FORBES, JL FOUSSET, S FRANCON, B FRANEK, P FRENKIEL, DC FRIES, AG FRODESEN, R FRUHWIRTH, F FULDAQUENZER, H FURSTENAU, J FUSTER, D GAMBA, M GANDELMAN, C GARCIA, J GARCIA, C GASPAR, U GASPARINI, P GAVILLET, EN GAZIS, JP GERBER, P GIACOMELLI, D GILLESPIE, R GOKIELI, B GOLOB, VM GOLOVATYUK, JJGY CADENAS, G GOPAL, L GORN, M GORSKI, V GRACCO, A GRANT, F GRARD, E GRAZIANI, G GROSDIDIER, E GROSS, B GROSSETETE, P GUNNARSSON, J GUY, U HAEDINGER, F HAHN, M HAHN, S HAHN, S HAIDER, Z HAJDUK, A HAKANSSON, A HALLGREN, K HAMACHER, GH DEMONCHENAULT, W HAO, FJ HARRIS, V HEDBERG, T HENKES, R HENRIQUES, JJ HERNANDEZ, JA HERNANDO, P HERQUET, H HERR, TL HESSING, I HIETANEN, CO HIGGINS, E HIGON, HJ HILKE, TS HILL, SD HODGSON, T HOFMOKL, SO HOLMGREN, PJ HOLT, D HOLTHUIZEN, PF HONORE, M HOULDEN, J HRUBEC, K HUET, K HULTQVIST, P IOANNOU, PS IVERSEN, JN JACKSON, R JACOBSSON, P JALOCHA, G JARLSKOG, P JARRY, B JEANMARIE, EK JOHANSSON, M JONKER, L JONSSON, P JUILLOT, G KALKANIS, G KALMUS, F KAPUSTA, M KARLSSON, E KARVELAS, S KATSANEVAS, EC KATSOUFIS, R KERANEN, BA KHOMENKO, NN KHOVANSKI, B KING, NJ KJAER, H KLEIN, A KLOVNING, P KLUIT, A KOCHMEHRIN, JH KOEHNE, B KOENE, P KOKKINIAS, M KORATZINOS, K KORCYL, AV KORYTOV, V KOSTIOUKHINE, C KOURKOUMELIS, O KOUZNETSOV, PH KRAMER, M KRAMMER, C KREUTER, J KROLIKOWSKI, I KRONKVIST, W KRUPINSKI, W KUCEWICZ, K KULKA, K KURVINEN, C LACASTA, C LAMBROPOULOS, JW LAMSA, L LANCERI, P LANGEFELD, V LAPIN, I LAST, JP LAUGIER, R LAUHAKANGAS, F LEDROIT, R LEITNER, Y LEMOIGNE, J LEMONNE, G LENZEN, V LEPELTIER, JM LEVY, E LIEB, D LIKO, J LINDGREN, R LINDNER, A LIPNIACKA, I LIPPI, B LOERSTAD, M LOKAJICEK, JG LOKEN, A LOPEZFERNANDEZ, MAL AGUERA, M LOS, D LOUKAS, JJ LOZANO, P LUTZ, L LYONS, G MAEHLUM, J MAILLARD, A MAIO, A MALTEZOS, F MANDL, J MARCO, M MARGONI, JC MARIN, C MARIOTTI, A MARKOU, T MARON, S MARTI, C MARTINEZRIVERO, F MARTINEZVIDAL, F MATORRAS, C MATTEUZZI, G MATTHIAE, M MAZZUCATO, M MCCUBBIN, R MCKAY, R MCNULTY, J MEDBO, C MERONI, WT MEYER, M MICHELOTTO, I MIKULEC, L MIRABITO, WA MITAROFF, GV MITSELMAKHER, U MJOERNMARK, T MOA, R MOELLER, K MOENIG, MR MONGE, P MORETTINI, H MUELLER, WJ MURRAY, B MURYN, G MYATT, F NARAGHI, FL NAVARRIA, P NEGRI, S NEMECEK, W NEUMANN, N NEUMEISTER, R NICOLAIDOU, BS NIELSEN, V NIKOLAENKO, PES NILSEN, P NISS, A NOMEROTSKI, M NOVAK, V OBRAZTSOV, AG OLSHEVSKI, R ORAVA, A OSTANKOV, K OSTERBERG, A OURAOU, P PAGANINI, M PAGANONI, R PAIN, H PALKA, TD PAPADOPOULOU, L PAPE, F PARODI, A PASSERI, M PEGORARO, J PENNANEN, L PERALTA, H PERNEGGER, M PERNICKA, A PERROTTA, C PETRIDOU, A PETROLINI, G PIANA, F PIERRE, M PIMENTA, S PLASZCZYNSKI, O PODOBRIN, ME POL, G POLOK, P POROPAT, V POZDNIAKOV, M PREST, P PRIVITERA, A PULLIA, D RADOJICIC, S RAGAZZI, H RAHMANI, PN RATOFF, AL READ, M REALE, P REBECCHI, NG REDAELLI, M REGLER, D REID, PB RENTON, LK RESVANIS, F RICHARD, J RICHARDSON, J RIDKY, G RINAUDO, A ROMERO, I RONCAGLIOLO, P RONCHESE, C RONNQVIST, EI ROSENBERG, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANNKLEIDER, A RUIZ, H SAARIKKO, Y SACQUIN, G SAJOT, J SALT, J SANCHEZ, M SANNINO, S SCHAEL, H SCHNEIDER, MAE SCHYNS, G SCIOLLA, F SCURI, AM SEGAR, A SEITZ, R SEKULIN, M SESSA, R SEUFERT, RC SHELLARD, I SICCAMA, P SIEGRIST, S SIMONETTI, F SIMONETTO, AN SISAKIAN, G SKJEVLING, G SMADJA, N SMIRNOV, O SMIRNOVA, GR SMITH, R SOSNOWSKI, D SOUZASANTOS, T SPASSOV, E SPIRITI, S SQUARCIA, H STAECK, C STANESCU, S STAPNES, G STAVROPOULOS, F STICHELBAUT, A STOCCHI, J STRAUSS, J STRAVER, R STRUB, B STUGU, M SZCZEKOWSKI, M SZEPTYCKA, P SZYMANSKI, T TABARELLI, O TCHIKILEV, GE THEODOSIOU, A TILQUIN, J TIMMERMANS, VG TIMOFEEV, LG TKATCHEV, T TODOROV, DZ TOET, O TOKER, A TOMARADZE, B TOME, E TORASSA, L TORTORA, D TREILLE, W TRISCHUK, G TRISTRAM, C TRONCON, A TSIROU, EN TSYGANOV, ML TURLUER, T TUUVA, IA TYAPKIN, M TYNDEL, S TZAMARIAS, B UEBERSCHAER, S UEBERSCHAER, O ULLALAND, V UVAROV, G VALENTI, E VALLAZZA, JAV FERRER, C VANDERVELDE, GW VANAPELDOORN, P VANDAM, M VANDERHEIJDEN, WK VANDONINCK, J VANELDIK, P VAZ, G VEGNI, L VENTURA, W VENUS, F VERBEURE, M VERLATO, LS VERTOGRADOV, D VILANOVA, P VINCENT, L VITALE, E VLASOV, AS VODOPYANOV, M VOLLMER, M VOUTILAINEN, V VRBA, H WAHLEN, C WALCK, F WALDNER, A WEHR, M WEIERSTALL, P WEILHAMMER, AM WETHERELL, JH WICKENS, M WIELERS, GR WILKINSON, WSC WILLIAMS, M WINTER, G WORMSER, K WOSCHNAGG, A ZAITSEV, A ZALEWSKA, D ZAVRTANIK, E ZEVGOLATAKOS, NI ZIMIN, M ZITO, D ZONTAR, R ZUBERI, G ZUMERLE, J ZUNIGA

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A measurement of D meson production in Z⁰ hadronic decays

Zeitschrift für Physik C Particles and Fields 59:4 (1993) 533-545

Authors:

P Abreu, W Adam, T Adye, E Agasi, I Ajinenko, R Aleksan, GD Alekseev, A Algeri, P Allen, A Almehed, SJ Alvsvaag, U Amaldi, A Andreazza, P Antilogus, WD Apel, RJ Apsimon, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, GJ Barker, A Baroncelli, O Barring, JA Barrio, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, Y Belokopyptov, P Beltran, D Benedic, AC Benvenuti, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonesini, W Bonivento, PSL Booth, G Borisov, H Borner, C Bosio, B Bostjancic, S Bosworth, O Botner, B Bouquet, C Bourdarios, TJV Bowcock, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, H Briand, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, R Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, V Chabaud, A Chan, M Chapkin, P Charpentier, L Chaussard, J Chauveau, P Checchia, GA Chelkov

Abstract:

A study of the fragmentation properties of charm and bottom quarks into D mesons is presented. From 263 700 Z0 hadronic decays collected in 1991 with the DELPHI detector at the LEP collider, D0, D+ and D*+ are reconstructed in the modes K-π+, K-π+K+ and D0π+ followed by D0→K-π+, respectively. The fractional decay widths {Mathematical expression} are determined, and first results are presented for the production of D mesons from {Mathematical expression} and {Mathematical expression} events separately. The average energy fraction of D*± in charm quark fragmentation is found to be 〈XE(D*)〉c=0.487± 0.015 (stat)±0.005 (sys.). Assuming that the fraction of Ds and charm-baryons produced at LEP is similar to that around 10 GeV, the Z0 partial width into charm quark pairs is determined to be Γc/Γh=0.187±0.031 (stat)±0.023 (sys). The probability for a b quark to fragment into {Mathematical expression} or b-baryons is inferred to be 0.268±0.094 (stat)±0.100 (sys) from the measured probability that it fragments into a {Mathematical expression} or B-. © 1993 Springer-Verlag.

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Production of Λ and ΛΛ correlations in the hadronic decays of the Z⁰

Physics Letters B 318:1 (1993) 249-262

Authors:

P Abreu, W Adam, T Adye, E Agasi, R Aleksan, GD Alekseev, A Algeri, P Allen, S Almehed, SJ Alvsvaag, U Amaldi, A Andreazza, P Antilogus, WD Apel, RJ Apsimon, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, GJ Barker, A Baroncelli, O Barring, JA Barrio, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Becks, M Begalli, P Beilliere, Y Belokopytov, P Beltran, D Benedic, AC Benvenuti, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, J Blocki, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonesini, W Bonivento, PSL Booth, G Borisov, H Borner, C Bosio, B Bostjancic, S Bosworth, O Botner, E Boudinov, B Bouquet, C Bourdarios, TJV Bowcock, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, H Briand, C Bricman, L Brillault, RCA Brown, P Bruckman, JM Brunet, A Budziak, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, R Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, V Chabaud, A Chan, P Charpentier, L Chaussard, J Chauveau, P Checchia

Abstract:

An analysis of the production of the Λ baryon in the hadronic decays of the Z0 is presented, based on about 993K multihadronic events collected by the DELPHI detector at LEP during 1991 and 1992. The differencial cross section of the Λ and the correlations between Λ and Λ produced in the same event are compared to current models, based both on string fragmentation and on cluster decay. The predictions of the string fragmentation model are found to give satisfactory agreements with the data, clearly better than those of the cluster model. © 1993.

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Measurement of the triple-gluon vertex from 4-jet events at LEP

Zeitschrift für Physik C Particles and Fields 59:3 (1993) 357-368

Authors:

P Abreu, W Adam, T Adye, E Agasi, R Aleksan, GD Alekseev, A Algeri, P Allen, S Almehed, SJ Alsvaag, U Amaldi, A Andreazza, P Antilogus, WD Apel, RJ Apsimon, Y Arnoud, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, R Barate, G Barbiellini, DY Bardin, GJ Barker, A Baroncelli, O Barring, JA Barrio, W Bartl, MJ Bates, M Battaglia, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, Y Belokopytov, P Beltran, D Benedic, AC Benvenuti, M Berggren, D Bertrand, F Bianchi, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, V Bocci, PN Bogolubov, T Bolognese, M Bonesini, W Bonivento, PSL Booth, G Borisov, H Borner, C Bosio, B Bostiancic, S Bosworth, O Botner, B Bouquet, C Bourdarios, TJV Bowcock, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, H Briand, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, R Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, C Caso, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, V Chabaud, A Chan, M Chapkin, P Charpentier, L Chaussard, J Chauveau, P Checchia, GA Chelkov

Abstract:

From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the generalized Nachtmann Reiter angle θNR* and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields {Mathematical expression} where CA/CF is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, and NC/NA, the ratio of the number of quark colours to the number of gluons. This constitutes a convincing model-independent proof of the existence of the triple-gluon vertex, since its contribution is directly proportional to CA/CF. The results are in agreement with the values expected from QCD:CA/CF=2.25, and NC/NA=3/8. © 1993 Springer-Verlag.

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Guy Wilkinson

Sub department

J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z

Authors:

MEASUREMENT OF THE B0-(B0)OVER-BAR MIXING USING THE AVERAGE ELECTRIC CHARGE OF HADRON-JETS IN Z0-DECAYS

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A measurement of D meson production in Z⁰ hadronic decays

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Abstract:

Production of Λ and ΛΛ correlations in the hadronic decays of the Z⁰

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Abstract:

Measurement of the triple-gluon vertex from 4-jet events at LEP

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Abstract:

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Guy Wilkinson

Sub department

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J/PSI-PRODUCTION IN THE HADRONIC DECAYS OF THE Z

Authors:

MEASUREMENT OF THE B0-(B0)OVER-BAR MIXING USING THE AVERAGE ELECTRIC CHARGE OF HADRON-JETS IN Z0-DECAYS

Authors:

A measurement of D meson production in Z0 hadronic decays

Authors:

Abstract:

Production of Λ and ΛΛ correlations in the hadronic decays of the Z0

Authors:

Abstract:

Measurement of the triple-gluon vertex from 4-jet events at LEP

Authors:

Abstract:

A measurement of D meson production in Z⁰ hadronic decays

Production of Λ and ΛΛ correlations in the hadronic decays of the Z⁰