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Study of hard scattering processes in multihadron production from γγ collisions at LEP

Zeitschrift für Physik C Particles and Fields 62:3 (1994) 357-365

Authors:

P Abreu, W Adam, T Adye, E Agasi, R Aleksan, GD Alekseev, P Allport, S Almehed, FML Almeida Junior, 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, 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, A Budziak, L Bugge, T Buran, A Buys, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, R Campion, T Bamporesi, V Canale, K Cankocak, F Cao, F Carena, P Carrilho, L Carroll, R Cases, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, V Chabaud, A Chan, M Chapkin, P Charpentier, J Chauveau

Abstract:

The production of multihadronic states in γγ collisions at LEP has been studied with the DELPHI detector. The analyzed data correspond to an integrated luminosity of about 32pb-1, collected in the LEP runs of 1990-1992. Minimum bias data and a sample of events with jets at high pT have been selected under the requirement that no scattered electron or positron is observed. The two data sets have been compared to Monte Carlo predictions. The non-perturbative contribution described by the vector meson dominance Model and direct {Mathematical expression} production from pointlike photons described by the quark parton model were found to be insufficient to reproduce the data. It has been necessary to include a third interaction component, which is due to perburbative hard scattering of the partonic constituents of the photon. Several parametrisations of the quark and gluon densities of the photon have been tested. The interplay with the cut in jet transverse momentum, which is necessary for the separation of the perturbative and non-perturbative regions, is discussed. The data favour parametrisations with rather soft partonic content of the photon. © 1994 Springer-Verlag.
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INTERFERENCE OF NEUTRAL KAONS IN THE HADRONIC DECAYS OF THE Z(0)

PHYSICS LETTERS B 323:2 (1994) 242-252

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, 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, M BLUME, 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, T BRENKE, 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, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, V CHABAUD, A CHAN, M CHAPKIN, P CHARPENTIER, J CHAUVEAU, 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, V FALALEEV, D FASSOULIOTIS, M FEINDT, A FENYUK, 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, AV KORYTOV, V KOSTIOUKHINE, C KOURKOUMELIS, O KOUZNETSOV, PH KRAMER, M KRAMMER, C KREUTER, J KROLIKOWSKI, I KRONKVIST, W KUCEWICZ, K KULKA, K KURVINEN, C LACASTA, 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, 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, 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, PES NILSEN, P NISS, A NOMEROTSKI, 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, 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, A ROMERO, I RONCAGLIOLO, P RONCHESE, C RONNQVIST, EI ROSENBERG, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANNKLEIDER, A RUIZ, K RYBICKI, A RYBIN, 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, 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, M TURALA, ML TURLUER, T TUUVA, IA TYAPKIN, M TYNDEL, S TZAMARIAS, B UEBERSCHAER, S UEBERSCHAER, O ULLALAND, 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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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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