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SEARCHES FOR HEAVY NEUTRINOS FROM Z-DECAYS

PHYSICS LETTERS B 274:2 (1992) 230-238

Authors:

P ABREU, W ADAM, F ADAMI, T ADYE, T AKESSON, GD ALEKSEEV, P ALLEN, S ALMEHED, SJ ALVSVAAG, U AMALDI, E ANASSONTZIS, P ANTILOGUS, WD APEL, RJ APSIMON, B ASMAN, P ASTIER, JE AUGUSTIN, A AUGUSTINUS, P BAILLON, P BAMBADE, F BARAO, R BARATE, G BARBIELLINI, DY BARDIN, A BARONCELLI, O BARRING, W BARTL, MJ BATES, M BATTAGLIA, M BAUBILLIER, KH BECKS, CJ BEESTON, M BEGALLI, P BEILLIERE, Y BELOKOPYTOV, P BELTRAN, D BENEDIC, JM BENLLOCH, M BERGGREN, D BERTRAND, F BIANCHI, MS BILENKY, P BILLOIR, J BJARNE, D BLOCH, S BLYTH, V BOCCI, PN BOGOLUBOV, T BOLOGNESE, M BONAPART, M BONESINI, W BONIVENTO, PSL BOOTH, M BORATAV, P BORGEAUD, G BORISOV, H BORNER, C BOSIO, B BOSTJANCIC, O BOTNER, B BOUQUET, C BOURDARIOS, M BOZZO, S BRAIBANT, P BRANCHINI, KD BRAND, RA BRENNER, C BRICMAN, RCA BROWN, N BRUMMER, JM BRUNET, L BUGGE, T BURAN, H BURMEISTER, JAMA BUYTAERT, M CACCIA, M CALVI, AJC ROZAS, A CAMPION, T CAMPORESI, V CANALE, F CAO, F CARENA, L CARROLL, C CASO, E CASTELLI, MVC GIMENEZ, A CATTAI, FR CAVALLO, L CERRITO, A CHAN, M CHAPKIN, P CHARPENTIER, L CHAUSSARD, P CHECCHIA, GA CHELKOV, L CHEVALIER, P CHLIAPNIKOV, V CHOROWICZ, R CIRIO, MP CLARA, P COLLINS, JL CONTRERAS, R CONTRI, G COSME, F COUCHOT, HB CRAWLEY, D CRENNELL, G CROSETTI, M CROZON, JC MAESTRO, S CZELLAR, S DAGORET, E DAHLJENSEN, B DALMAGNE, M DAM, G DAMGAARD, G DARBO, E DAUBIE, PD DAUNCEY, M DAVENPORT, P DAVID, C DEFOIX, D DELIKARIS, S DELORME, P DELPIERRE, N DEMARIA, A DEANGELIS, M DEBEER, H DEBOECK, W DEBOER, C DECLERCQ, MDMD LASO, N DEGROOT, C DELAVAISSIERE, B DELOTTO, A DEMIN, H DIJKSTRA, L DICIACCIO, F DJAMA, J DOLBEAU, O DOLL, M DONSZELMANN, K DOROBA, M DRACOS, J DREES, M DRIS, Y DUFOUR, W DULINSKI, R DZHELYADIN, LO EEK, PAM EEROLA, T EKELOF, G EKSPONG, AE PEISERT, JP ENGEL, D FASSOULIOTIS, M FEINDT, MF ALONSO, A FERRER, TA FILIPPAS, A FIRESTONE, H FOETH, E FOKITIS, P FOLEGATI, F FONTANELLI, KAJ FORBES, H FORSBACH, B FRANEK, P FRENKIEL, DC FRIES, AG FRODESEN, R FRUHWIRTH, F FULDAQUENZER, K FURNIVAL, H FURSTENAU, J FUSTER, G GALEAZZI, D GAMBA, C GARCIA, J GARCIA, C GASPAR, U GASPARINI, P GAVILLET, EN GAZIS, JP GERBER, P GIACOMELLI, KW GLITZA, R GOKIELI, VM GOLOVATYUK, JJGY CADENAS, A GOOBAR, G GOPAL, M GORSKI, V GRACCO, A GRANT, F GRARD, E GRAZIANI, G GROSDIDIER, E GROSS, P GROSSEWIESMANN, B GROSSETETE, J GUY, F HAHN, M HAHN, S HAIDER, Z HAJDUK, A HAKANSSON, A HALLGREN, K HAMACHER, GH DEMONCHENAULT, FJ HARRIS, BW HECK, T HENKES, I HERBST, JJ HERNANDEZ, P HERQUET, H HERR, I HIETANEN, CO HIGGINS, E HIGON, HJ HILKE, SD HODGSON, T HOFMOKL, R HOLMES, SO HOLMGREN, D HOLTHUIZEN, PF HONORE, JE HOOPER, M HOULDEN, J HRUBEC, PO HULTH, K HULTQVIST, D HUSSON, P IOANNOU, D ISENHOWER, PS IVERSEN, JN JACKSON, P JALOCHA, G JARLSKOG, P JARRY, B JEANMARIE, EK JOHANSSON, D JOHNSON, M JONKER, L JONSSON, P JUILLOT, G KALKANIS, G KALMUS, F KAPUSTA, S KATSANEVAS, EC KATSOUFIS, R KERANEN, J KESTEMAN, BA KHOMENKO, NN KHOVANSKI, B KING, NJ KJAER, H KLEIN, W KLEMPT, A KLOVNING, P KLUIT, A KOCHMEHRIN, JH KOEHNE, B KOENE, P KOKKINIAS, M KOPF, M KORATZINOS, K KORCYL, AV KORYTOV, V KOSTIUKHIN, C KOURKOUMELIS, T KREUZBERGER, J KROLIKOWSKI, I KRONKVIST, J KRSTIC, U KRUENERMARQUIS, W KRUPINSKI, W KUCEWICZ, K KURVINEN, C LACASTA, C LAMBROPOULOS, JW LAMSA, L LANCERI, V LAPIN, JP LAUGIER, R LAUHAKANGAS, G LEDER, F LEDROIT, R LEITNER, Y LEMOIGNE, J LEMONNE, G LENZEN, V LEPELTIER, A LETESSIERSELVON, E LIEB, D LIKO, E LILLETHUN, J LINDGREN, A LIPNIACKA, I LIPPI, R LLOSA, B LOERSTAD, M LOKAJICEK, JG LOKEN, A LOPEZFERNANDEZ, MAL AGUERA, M LOS, D LOUKAS, A LOUNIS, JJ LOZANO, P LUTZ, L LYONS, G MAEHLUM, N MAGNUSSEN, J MAILLARD, A MALTEZOS, F MANDL, J MARCO, M MARGONI, JC MARIN, A MARKOU, S MARTI, L MATHIS, F MATORRAS, C MATTEUZZI, G MATTHIAE, M MAZZUCATO, M MCCUBBIN, R MCKAY, R MCNULTY, E MENICHETTI, G MEOLA, C MERONI, WT MEYER, M MICHELOTTO, 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, U NAUKORZEN, FL NAVARRIA, P NEGRI, BS NIELSEN, B NIJJHAR, V NIKOLAENKO, V OBRAZTSOV, K OESTERBERG, AG OLSHEVSKI, R ORAVA, A OSTANKOV, A OURAOU, M PAGANONI, R PAIN, H PALKA, T PAPADOPOULOU, L PAPE, A PASSERI, M PEGORARO, J PENNANEN, V PEREVOZCHIKOV, M PERNICKA, A PERROTTA, F PIERRE, M PIMENTA, O PINGOT, ME POL, G POLOK, P POROPAT, P PRIVITERA, A PULLIA, D RADOJICIC, S RAGAZZI, PN RATOFF, AL READ, NG REDAELLI, M REGLER, D REID, PB RENTON, LK RESVANIS, F RICHARD, M RICHARDSON, J RIDKY, G RINAUDO, I RODITI, A ROMERO, I RONCAGLIOLO, P RONCHESE, C RONNQVIST, EI ROSENBERG, U ROSSI, E ROSSO, P ROUDEAU, T ROVELLI, W RUCKSTUHL, V RUHLMANN, A RUIZ, K RYBICKI, H SAARIKKO, Y SACQUIN, G SAJOT, J SALT, E SANCHEZ, J SANCHEZ, M SANNINO, M SCHAEFFER, S SCHAEL, H SCHNEIDER, MAE SCHYNS, F SCURI, AM SEGAR, R SEKULIN, M SESSA, G SETTE, R SEUFERT, RC SHELLARD, P SIEGRIST, S SIMONETTI, F SIMONETTO, AN SISSAKIAN, TB SKAALI, G SKJEVLING, G SMADJA, N SMIRNOV, GR SMITH, R SOSNOWSKI, TS SPASSOFF, E SPIRITI, S SQUARCIA, H STAECK, C STANESCU, G STAVROPOULOS, F STICHELBAUT, A STOCCHI, J STRAUSS, R STRUB, M SZCZEKOWSKI, M SZEPTYCKA, P SZYMANSKI, T TABARELLI, S TAVERNIER, O TCHIKILEV, GE THEODOSIOU, A TILQUIN, J TIMMERMANS, VG TIMOFEEV, LG TKATCHEV, T TODOROV, DZ TOET, O TOKER, E TORASSA, L TORTORA, MT TRAINOR, D TREILLE, U TREVISAN, W TRISCHUK, G TRISTRAM, C TRONCON, A TSIROU, EN TSYGANOV, M TURALA, R TURCHETTA, 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, WK VANDONINCK, J VARELA, P VAZ, G VEGNI, L VENTURA, W VENUS, F VERBEURE, LS VERTOGRADOV, L VIBERT, D VILANOVA, L VITALE, E VLASOV, EV VLASOV, S VLASSOPOULOS, AS VODOPYANOV, M VOLLMER, S VOLPONI, G VOULGARIS, M VOUTILAINEN, V VRBA, H WAHLEN, C WALCK, F WALDNER, M WAYNE, P WEILHAMMER, J WERNER, AM WETHERELL, JH WICKENS, J WIKNE, GR WILKINSON, WSC WILLIAMS, M WINTER, D WORMALD, G WORMSER, K WOSCHNAGG, N YAMDAGNI, P YEPES, A ZAITSEV, A ZALEWSKA, P ZALEWSKI, D ZAVRTANIK, E ZEVGOLATAKOS, G ZHANG, NI ZIMIN, M ZITO, R ZITOUN, RZ FUNCHAL, G ZUMERLE, J ZUNIGA
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TURNING THE PROTON INSIDE OUT

NEW SCIENTIST 134:1823 (1992) 29-33

Authors:

C SUTTON, N HARNEW
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The reaction e+e- → γγ(γ) at Z0 energies

Physics Letters B 268:2 (1991) 296-304

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, F Alted, SJ Alvsvaag, U Amaldi, E Anassontzis, P Antilogus, WD Apel, RJ Apsimon, B Åsman, P Astier, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, M Battaglia, MJ Bates, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beilliere, Y Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, S Biagi, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, W Bonivento, PSL Booth, M Boratav, P Borgeaud, G Borisov, H Borner, C Bosio, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brunner, JM Brunet, L Bugge, T Braun, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, JE Campagne, A Campion, T Camporesi, V Canale, F Cao, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, P Charpentier, P Checcia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, P Collins, JL Contreras, R Contri

Abstract:

The total and differential cross-sections for the reaction e+e- → γγ(γ) are measured at centre of mass energies around 91 GeV using an integrated luminosity of 4.7 pb-1. The aggreement with QED prediction is good. Consequently there is no evidence for non-standard channels which would have the same experimental signature. The lower limits on the QED cuttoff parameters are Λ+ > 113 GeV and Λ- > 95 GeV. An upper limit on the effective coupling between a possible excited electron and the gamma is derived. At 95% confidence level the branching ratios for Z0 decay into π0γ, ηψ and γγγ are below 1.5 × 10-4, 2.8 × 10-4 and 1.4 × 10-4 respectively. © 1991.
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A measurement of the lifetime of the tau lepton

Physics Letters B Elsevier 267:3 (1991) 422-430

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, SJ Alvsvaag, U Amaldi, E Anassontzis, P Antilogus, W-D Apel, R-J Apsimon, B Åsman, P Astier, J-E Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, M Battaglia, MJ Bates, M Baubillier, K-H Becks, CJ Beeston, M Begalli, P Beilliere, Yu Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, W Bonivento, PSL Booth, M Boratav, P Borgeaud, G Borisov, H Borner, C Bosio, B Bostjancic, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brummer, J-M Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, J-E Campagne, A Campion, T Camporesi, V Canale, F Cao, F Carena, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, A Chan, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, P Collins, JL Contreras, R Contri, G Cosme, F Couchot, HB Crawley, D Crennell, G Crosetti, N Crosland, M Crozon, J Cuevas Maestro, S Czellar, S Dagoret, E Dahl-Jensen, B Dalmagne, M Dam, G Damgaard, G Darbo, E Daubie, PD Dauncey, M Davenport, P David, A De Angelis, M De Beer, H De Boeck, W De Boer, C De Clercq, MDM De Fez Laso, N De Groot, C De La Vaissiere, B De Lotto, A De Min, C Defoix, D Delikaris, S Delorme, P Delpierre, N Demaria, J Derkaoui, L Di Ciaccio, H Dijkstra, F Djama, J Dolbeau, M Donszelmann, K Doroba, M Dracos, J Drees, M Dris, Y Dufour, W Dulinski, L-O Eek, PA-M Eerola, T Ekelof, G Ekspong, A Elliot Peisert, J-P Engel, V Falaleev, D Fassouliotis, M Fernandez Alonso, A Ferrer, TA Filippas, A Firestone, H Foeth, E Fokitis, P Folegati, F Fontanelli, KAJ Forbes, H Forsbach, B Franek, P Frenkiel, DC Fries, AG Frodesen, R Fruhwirth, F Fulda-Quenzer, K Furnival, H Furstenau, J Fuster, JM Gago, G Galeazzi, D Gamba, C Garcia, J Garcia, U Gasparini, P Gavillet, EN Gazos, J-P Gerber, P Giacomelli, K-W Glitza, R Gokieli, VM Golovatyuk, JJ Gomez Y Cadenas, A Goobar, G Gopal, M Gorski, V Gracco, A Grant, F Grard, E Graziani, M-H Gros, G Grosdidier, E Gross, B Grossetete, S Gumenyuk, J Guy, F Hahn, M Hahn, S Haider, Z Hajduk, A Hakansson, A Hallgren, A Hallgren, K Hamacher, G Hamel De Monchenault, FJ Harris, BW Heck, T Henkes, I Herbst, JJ Hernandez, P Herquet, H Herr, I Hietanen, CO Higgins, E Higon, HJ Hilke, SD Hodgson, T Hofmokl, R Holmes, S-O Holmgren, D Holthuizen, PF Honore, JE Hooper, R Horisberger, M Houlden, J Hrubec, PO Hulth, K Hultqvist, D Husson, BD Hyams, P Ioannou, D Isenhower, P-S Iversen, JN Jackson, P Jalocha, G Jarlskog, P Jarry, B Jean-Marie, EK Johansson, D Johnson, M Jonker, L Jonsson, P Juillot, G Kalkanis, G Kalmus, G Kantardjian, F Kapusta, S Katsanevas, EC Katsoufis, R Keranen, J Kesteman, BA Khomenko, NN Khovanski, B King, NJ Kjaer, H Klein, W Klempt, A Klovning, P Kluit, JH Koehne, B Koene, P Kokkinias, M Kopf, M Koratzinos, K Korcyl, AV Korytov, B Korzen, V Kostukhin, C Kourkoumelis, T Kreuzberger, J Krolikowski, U Kruener-Marquis, W Krupinski, W Kucewicz, K Kurvinen, C Lacasta, C Lambropoulos, JW Lamsa, L Lanceri, V Lapin, J-P Laugier, R Lauhakangas, G Leder, F Ledroit, J Lemonne, G Lenzen, V Lepeltier, A Letessier-Selvon, D Liko, E Lieb, E Lillethun, J Lindgren, A Lipniacka, I Lippi, R Llosa, B Loerstad, M Lokajicek, JG Loken, MA Lopez Aguera, A Lopez-Fernandez, M Los, D Loukas, A Lounis, JJ Lozano, R Lucock, P Lutz, L Lyons, G Maehlum, J Maillard, A Maltezos, S Maltezos, F Mandl, J Marco, M Margoni, J-C Marin, A Markou, S Marti, L Mathis, F Matorras, C Matteuzzi, G Matthiae, M Matveev, M Mazzucato, M Mc Cubbin, R Mc Nulty, E Menichetti, G Meola, C Meroni, WT Meyer, M Michelotto, WA Mitaroff, GV Mitselmakher, U Mjoernmark, T Moa, R Moeller, K Moenig, MR Monge, P Morettini, H Mueller, H Muller, WJ Murray, G Myatt, F Naraghi, U Nau-Korzen, FL Navarria, P Negri, BS Nielsen, B Nijjhar, V Nikolaenko, V Obraztsov, AG Olshevski, R Orava, A Ostankov, A Ouraou, R Pain, H Palka, T Papadopoulou, L Pape, A Passeri, M Pegoraro, V Perevozchikov, M Pernicka, A Perrotta, F Pierre, M Pimenta, O Pingot, A Pinsent, ME Pol, G Polok, P Poropat, P Privitera, A Pullia, J Pyyhtia, D Radojicic, S Ragazzi, PN Ratoff, AL Read, NG Redaelli, M Regler, D Reid, PB Renton, LK Resvanis, F Richard, M Richardson, J Ridky, G Rinaudo, I Roditi, A Romero, I Roncagliolo, P Ronchese, C Ronnqvist, EI Rosenberg, U Rossi, E Rosso, P Roudeau, T Rovelli, W Ruckstuhl, V Ruhlmann, A Ruiz, K Rybicki, H Saarikko, Y Sacquin, J Salt, E Sanchez, J Sanchez, M Sannino, M Schaeffer, S Schael, H Schneider, MAE Schyns, F Scuri, AM Segar, R Sekulin, M Sessa, G Sette, R Seufert, RC Shellard, P Siegrist, S Simonetti, F Simonetto, F Simonetto, AN Sissakian, TB Skaali, G Skjevling, G Smadja, GR Smith, N Smirnov, R Sosnowski, TS Spassoff, E Spiriti, S Squarcia, H Staeck, C Stanescu, G Stavropoulos, F Stichelbaut, A Stocchi, J Strauss, R Strub, CJ Stubenrauch, M Szczekowski, M Szeptycka, P Szymanski, T Tabarelli, S Tavernier, GE Theodosiou, A Tilquin, J Timmermans, VG Timofeev, LG Tkatchev, T Todorov, DZ Toet, L Tortora, MT Trainor, D Treille, U Trevisan, W Trischuk, G Tristam, C Troncon, A Tsirou, EN Tsyganov, M Turala, R Turchetta, M-L Turluer, T Tuuva, IA Tyapkin, M Tyndel, S Tzamarias, B Ueberschaer, S Ueberschaer, O Ullaland, VA Uvarov, G Valenti, E Vallazza, JA Valls Ferrer, GW Van Apeldoorn, P Van Dam, WK Van Doninck, N Van Eijndhoven, C Vander Velde, J Varela, P Vaz, G Vegni, L Ventura, W Venus, F Verbeure, LS Vertogradov, L Vibert, D Vilanova, EV Vlasov, AS Vodopyanov, M Vollmer, S Volponi, G Voulgaris, M Voutilainen, V Vrba, H Wahlen, C Walck, F Waldner, M Wayne, P Weilhammer, J Werner, AM Wetherell, JH Wickens, J Wikne, GR Wilkinson, WSC Williams, M Winter, D Wormald, G Wormser, K Woschnagg, N Yamdagni, P Yepes, A Zaitsev, A Zalewska, P Zalewski, D Zavrtanik, E Zevgolatakos, G Zhang, NI Zimin, M Zito, R Zitoun, R Zukanovich Funchal, G Zumerle, J Zuniga
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Charged particle multiplicity distributions in restricted rapidity intervals in Z0 hadronic decays

Zeitschrift für Physik C Particles and Fields 52:2 (1991) 271-281

Authors:

P Abreu, W Adam, F Adami, T Adye, T Akesson, GD Alekseev, P Allen, S Almehed, F Alted, SJ Alvsvaag, U Amaldi, E Anassontzis, P Antilogus, WD Apel, B Åsman, JE Augustin, A Augustinus, P Baillon, P Bambade, F Barao, G Barbiellini, DY Bardin, A Baroncelli, O Barring, W Bartl, M Battaglia, MJ Bates, M Baubillier, KH Becks, CJ Beeston, M Begalli, P Beiliere, Y Belokopytov, P Beltran, D Benedic, JM Benlloch, M Berggren, D Bertrand, S Biagi, F Bianchi, JH Bibby, MS Bilenky, P Billoir, J Bjarne, D Bloch, S Blyth, PN Bogolubov, T Bolognese, M Bonapart, M Bonesini, PSL Booth, M Boratav, P Borgeaud, H Borner, C Bosio, O Botner, B Bouquet, M Bozzo, S Braibant, P Branchini, KD Brand, RA Brenner, C Bricman, RCA Brown, N Brummer, JM Brunet, L Bugge, T Buran, H Burmeister, JAMA Buytaert, M Caccia, M Calvi, AJ Camacho Rozas, JE Campagne, A Campion, T Camporesi, V Canale, F Cao, L Carroll, C Caso, E Castelli, MV Castillo Gimenez, A Cattai, FR Cavallo, L Cerrito, M Chapkin, P Charpentier, P Checchia, GA Chelkov, L Chevalier, P Chliapnikov, V Chorowicz, R Cirio, MP Clara, P Collins, JL Contreras, R Contri, G Cosme, F Couchot, HB Crawley

Abstract:

The multiplicity distributions of charged particles in restricted rapidity intervals in Z0 hadronic decays measured by the DELPHI detector are presented. The data reveal a shoulder structure, best visible for intervals of intermediate size, i.e. for rapidity limits around ±1.5. The whole set of distributions including the shoulder structure is reproduced by the Lund Parton Shower model. The structure is found to be due to important contributions from 3-and 4-jet events with a hard gluon jet. A different model, based on the concept of independently produced groups of particles, "clans", fluctuating both in number per event and particle content per clan, has also been used to analyse the present data. The results show that for each interval of rapidity the average number of clans per event is approximately the same as at lower energies. © 1991 Springer-Verlag.
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