Copyright © 1993 Published by Elsevier Science B.V. All rights reserved.
Production of Λ and Λ
correlations in the hadronic decays of the Z0
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DELPHI Collaboration
P. Abreut, W. Adamg, T. Adyeak, E. Agasiad, R. Aleksanam, G. D. Alekseevn, A. Algerim, P. Allenaw, S. Almehedw, S. J. Alvsvaagd, U. Amaldig, A. Andreazzaaa, P. Antilogusx, W-D. Apelo, R. J. Apsimonak, Y. Arnoudam, B. Åsmanas, J-E. Augustinr, A. Augustinusad, P. Baillong, P. Bambader, F. Baraot, R. Baratel, G. Barbiellini3, au, D. Y. Bardinn, G. J. Barkerah, A. Baroncelliao, O. Barringg, J. A. Barrioy, W. Bartlay, M. J. Batesak, M. Battagliam, M. Baubillierv, K-H. Becksba, M. Begalliaj, P. Beillieref, Yu. Belokopytovaq, P. Beltrani, D. Benedich, A. C. Benvenutie, M. Berggrenr, D. Bertrand1, 2, b, F. Bianchiat, M. S. Bilenkyn, P. Billoirv, J. Bjarnew, D. Blochh, J. Blockiaz, S. Blythah, V. Boccial, P. N. Bogolubovn, T. Bologneseam, M. Bonesiniaa, W. Boniventoaa, P. S. L. Boothu, G. Borisovaq, H. Bornerg, C. Bosioao, B. Bostjancicar, S. Bosworthah, O. Botnerav, E. Boudinovaq, B. Bouquetg, C. Bourdariosr, T. J. V. Bowcocku, M. Bozzok, S. Braibant1, 2, b, P. Branchiniao, K. D. Brandai, R. A. Brennerg, H. Briandv, C. Bricman1, 2, b, L. Brillaultv, R. C. A. Browng, P. Bruckmanp, J-M. Brunetf, A. Budziakp, L. Buggeaf, T. Buranaf, H. Burmeisterg, J. A. M. A. Buytaertg, M. Cacciag, M. Calviaa, A. J. Camacho Rozasap, R. Campionu, T. Camporesig, V. Canaleal, F. Cao1, 2, b, F. Carenag, L. Carrollu, M. V. Castillo Gimenezaw, A. Cattaig, F. R. Cavalloe, L. Cerritoal, V. Chabaudg, A. Chana, Ph. Charpentierg, L. Chaussardr, J. Chauveauv, P. Checchiaai, G. A. Chelkovn, L. Chevalieram, P. Chliapnikovaq, V. Chorowiczv, J. T. M. Chrinaw, V. Cindroar, P. Collinsah, J. L. Contrerasy, R. Contrik, E. Cortinaaw, G. Cosmer, F. Couchotr, H. B. Crawleya, D. Crennellak, G. Crosettik, J. Cuevas Maestroag, S. Czellarm, E. Dahl-Jensenab, B. Dalmagner, M. Damaf, G. Damgaardab, G. Darbok, E. Daubie1, 2, b, A. Daumo, P. D. Daunceyah, M. Davenportg, J. Daviesu, W. Da Silvav, C. Defoixf, P. Delpierrez, N. Demariaat, A. De Angelis3, au, H. De Boeck1, 2, b, W. De Boero, S. De Brabandere1, 2, b, C. De Clercq1, 2, b, M. D. M. De Fez Lasoaw, C. De La Vaissierev, B. De Lotto3, au, A. De Minaa, H. Dijkstrag, L. Di Ciaccioal, J. Dolbeauf, M. Donszelmanng, K. Dorobaaz, M. Dracosg, J. Dreesba, M. Drisae, Y. Dufourg, F. Dupontl, D. Edsalla, L-O. Eekav, P. A. -M. Eerolag, R. Ehreto, T. Ekelofav, G. Ekspongas, A. Elliot Peisertai, M. Elsingba, J-P. Engelh, N. Ershaidatv, M. Espirito Santot, V. Falaleevaq, D. Fassouliotisae, M. Feindtg, A. Ferreraw, T. A. Filippasae, A. Firestonea, H. Foethg, E. Fokitisae, F. Fontanellik, K. A. J. Forbesu, J-L. Foussetz, S. Franconx, B. Franekak, P. Frenkielf, D. C. Frieso, A. G. Frodesend, F. Fulda-Quenzerr, H. Furstenauo, J. Fusterg, D. Gambaat, C. Garciaaw, J. Garciaap, C. Gasparg, U. Gaspariniai, Ph. Gavilletg, E. N. Gazisae, J-P. Gerberh, P. Giacomellig, D. Gillespieg, R. Gokieliaz, B. Golobar, V. M. Golovatyukn, J. J. Gomez Y Cadenasg, G. Gopalak, L. Gorna, M. Gorskiaz, V. Graccok, A. Grantg, F. Grard1, 2, b, E. Grazianiao, G. Grosdidierr, E. Grossg, B. Grossetetev, S. Gumenyukaq, J. Guyak, U. Haedingero, F. Hahnba, M. Hahno, S. Haiderad, Z. Hajdukp, A. Hakanssonw, A. Hallgrenav, K. Hamacherba, G. Hamel De Monchenaultam, W. Haoae, F. J. Harrisah, V. Hedbergw, T. Henkesg, R. Henriquest, J. J. Hernandezaw, P. Herquet1, 2, b, H. Herrg, T. L. Hessingt, I. Hietanenm, C. O. Higginst, E. Higonaw, H. J. Hilkeg, S. D. Hodgsonah, T. Hofmoklaz, S-O. Holmgrenas, P. J. Holtah, D. Holthuizenad, P. F. Honoref, M. Houldenu, J. Hrubecay, K. Huet1, 2, b, P. O. Hulthas, K. Hultqvistas, P. Ioannouc, P-S. Iversend, J. N. Jacksonu, P. Jalochap, G. Jarlskogw, P. Jarryam, B. Jean-Marier, E. K. Johanssonas, M. Jonkerg, L. Jonssonw, P. Juilloth, G. Kalkanisc, G. Kalmusak, F. Kapustav, M. Karlssong, E. Karvelasi, S. Katsanevasc, E. C. Katsoufisae, R. Keraneng, B. A. Khomenkon, N. N. Khovanskin, B. Kingu, N. J. Kjaerg, H. Kleing, A. Klovningd, P. Kluitad, A. Koch-Mehrinba, J. H. Koehneo, B. Koenead, P. Kokkiniasi, M. Koratzinosaf, K. Korcylp, A. V. Korytovn, V. Kostioukhineaq, C. Kourkoumelisc, O. Kouznetsovn, P. H. Kramerba, M. Krammeray, C. Kreutero, J. Krolikowskiaz, I. Kronkvistw, U. Kruener-Marquisba, W. Kucewiczp, K. Kulkaav, K. Kurvinenm, C. Lacastaaw, C. Lambropoulosi, J. W. Lamsaa, L. Lanceri3, au, V. Lapinaq, I. Lastu, J-P. Laugieram, R. Lauhakangasm, G. Lederay, F. Ledroitl, R. Leitnerac, Y. Lemoigneam, J. Lemonne1, 2, b, G. Lenzenba, V. Lepeltierr, T. Lesiakp, J. M. Levyh, E. Liebba, D. Likoay, J. Lindgrenm, R. Lindnerba, I. Lippiai, B. Loerstadw, M. Lokajicekj, J. G. Lokenah, A. Lopez-Fernandezg, M. A. Lopez Agueraap, M. Losad, D. Loukasi, J. J. Lozanoaw, P. Lutzf, L. Lyonsah, G. Maehlumaf, J. Maillardf, A. Maiot,A. Malterosi, F. Mandlay, J. Marcoap, M. Margoniai, J-C. Maring, A. Markoui, T. Maronba, S. Martiaw, C. Martinez-Riveroap, F. Matorrasap, C. Matteuzziaa, G. Matthiaeal, M. Mazzucatoai, M. Mc Cubbinu, R. Mc Kaya, R. Mc Nultyu, J. Medboav, G. Meolak, C. Meronia, W. T. Meyera, M. Michelottoai, I. Mikulecay, L. Mirabitox, W. A. Mitaroffay, G. V. Mitselmakhern, U. Mjoernmarkw, T. Moaas, R. Moellerab, K. Moenigg, M. R. Mongek, P. Morettinik, H. Muellero, W. J. Murrayak, G. Myattah, F. L. Navarriae, P. Negriaa, S. Nemecekj, R. Nicolaidouc, B. S. Nielsenab, B. Nijjharu, V. Nikolaenkoaq, P. E. S. Nilsend, P. Nissas, A. Nomerotskiai, V. Obraztsovaq, A. G. Olshevskin, R. Oravam, A. Ostankovaq, K. Osterbergm, A. Ouraouam, M. Peganoniaa, R. Painv, H. Palkap, Th. D. Papadopoulouae, L. Papeg, F. Parodik, A. Passeriao, M. Pegoraroai, J. Pennanenm, L. Peraltat, H. Perneggeray, M. Pernickaay, A. Perrottae, C. Petridou3, au, A. Petrolinik, G. Pianak, F. Pierream, M. Pimentat, S. Plaszczynskir, O. Podobrino, M. E. Polq, G. Polokp, P. Paropat3, au, V. Pozdniakovn, P. Priviteral, A. Pulliaaa, D. Radojicicah, S. Ragazziaa, H. Rahmaniae, J. Ramesj, P. N. Ratoffs, A. L. Readaf, P. Rebecchig, N. G. Redaelliaa, M. Regleray, D. Reidg, P. B. Rentonah, L. K. Resvanisc, F. Richardr, J. Richardsonu, J. Ridkyj, G. Rinaudoat, I. Roditiq, A. Romeroat, I. Roncagliolok, P. Roncheseai, C. Ronnqvistm, E. I. Rosenberga, E. Rossog, P. Roudeaur, T. Rovellie, W. Ruckstuhlad, V. Ruhlmann-Kleideram, A. Ruizap, H. Saarikkom, Y. Sacquinam, G. Sajotl, J. Saltaw, J. Sanchezy, M. Sanninoan, k, S. Schaelg, H. Schneidero, M. A. E. Schynsba, G. Sciollaat, F. Scuri3, au, A. M. Segarah, A. Seitzo, R. Sekulinak, M. Sessa3, au, R. Seuferto, R. C. Shellardaj, I. Siccamaad, P. Siegristam, S. Simonettik, F. Simonettoai, A. N. Sisakiann, G. Skjevlingaf, G. Smadjax, am, O. Smirnovan, G. R. Smithak, R. Sosnowskiaz, D. Souza-Santosaj, T. Spassovt, E. Spiritiao, S. Squarciak, H. Staeckba, C. Stanescuao, S. Stapnesaf, G. Stavropoulosi, F. Stichelbaut1, 2, b, A. Stocchir, J. Straussay, J. Straverg, R. Strubh, B. Stugud, M. Szczekowskig, M. Szeptyckaaz, P. Szymanskiaz, T. Tabarelliaa, O. Tchikilevaq, G. E. Theodosioui, A. Tilquinz, J. Timmermansad, V. G. Timofeevn, L. G. Tkatchevn, T. Todorovh, D. Z. Toetad, O. Tokerm, A. 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Zitoam, D. Zontarar, R. Zuberiah, G. Zumerleai and J. Zunigaaw
a Ames Laboratory and Department of Physics, Iowa State University, Ames IA 50011, USA
b Physics Department, Univ. Instelling Antwerpen, Universiteitsplein 1, B-2610, Wilrijk, Belgium
1 IIHE, ULB-VUB, Pleinlaan 2, B-1050, Brussels, Belgium
2 Faculté des Sciences, Univ. de l'Etat Mons, Av. Maistriau 19, B-7000, Mons, Belgium
c Physics Laboratory, University of Athens, Solonos Str. 104, GR-10680, Athens, Greece
d Department of Physics, University of Bergen, Allégaten 55, N-5007, Bergen, Norway
e Dipartimento di Fisica, Università di Bologna and INFN, Via Irnerio 46, I-40126, Bologna, Italy
f Collège de France, Lab. de Physique Corpusculaire, IN2P3-CNRS, F-75231, Paris Cedex 05, France
g CERN, CH-1211, Geneva 23, Switzerland
h Centre de Recherche Nucléaire, IN2P3 - CNRS/ULP - BP20, F-67037, Strasbourg Cedex, France
i Institute of Nuclear Physics, N.C.S.R. Demokritos, P.O. Box 60228, GR-15310, Athens, Greece
j FZU, Inst. of Physics of the C.A.S. High Energy Physics Division, Na Slovance 2, CS-180 40, Praha 8, Czechoslavakia
k Dipartimento di Fisica, Università di Genova and INFN, Via Dodecaneso 33, I-16146, Genova, Italy
l Institut des Sciences Nucléaires, IN2P3-CNRS, Université de Grenoble 1, F-38026, Grenoble, France
m Research Institute for High Energy Physics, SEFT, Siltavuorenpenger 20C, SF-00170, Helsinki, Finland
n Joint Institute for Nuclear Research, Dubna, Head Post Office, P.O. Box 79, 101 000, Moscow, Russian Federation
o Institut für Experimentelle Kernphysik, Universität Karlsruhe, Postfach 6980, D-7500, Karlsruhe 1, Germany
p High Energy Physics Laboratory, Institute of Nuclear Physics, Ul. Kawiory 26a, PL-30055, Krakow 30, Poland
q Centro Brasileiro de Pesquisas Físicas, rua Xavier Sigaud 150, RJ-22290, Rio de Janeiro, Brazil
r Université de Paris-Sud, Lab. de l'Accélérateur Linéaire, IN2P3-CNRS, bat 200, F-91405, Orsay, France
s School of Physics and Materials, University of Lancaster, Lancaster LA1 4YB, UK
t LIP, IST, FCUL - Av. Elias Garcia, 14 1-o, P-1000, Lisboa Codex, Portugal
u Department of Physics, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
v LPNHE, IN2P3-CNRS, Universités Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, F-75252, Paris Cedex 05, France
w Department of Physics, University of Lund, Sölvegatan 14, S-22363, Lund, Sweden
x Université Claude Bernard de Lyon, IPNL, IN2P3-CNRS, F-69622, Villeurbanne Cedex, France
y Universidad Complutense, Avda. Complutense s/n, E-28040, Madrid, Spain
z Univ. d'Aix - Marseille II - CPP, IN2P3-CNRS, F-13288, Marseille Cedex 09, France
aa Dipartimento di Fisica, Università di Milano and INFN, Via Celoria 16, I-20133, Milan, Italy
ab Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark
ac NC, Nuclear Centre of MFF, Charles University, Areal MFF, V Holesovickach 2, CS-180 00, Praha 8, Czechoslovakia
ad NIKHEF-H, Postbus 41882, NL-1009 DB, Amsterdam, The Netherlands
ae National Technical University, Physics Department, Zografou Campus, GR-15773, Athens, Greece
af Physics Department, University of Oslo, Blindern, N-1000, Oslo 3, Norway
ag Dpto. Fisica, Univ. Oviedo, C/P Jimenez Casas, S/N-33006, Oviedo, Spain
ah Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
ai Dipartimento di Fisica, Università di Padova and INFN, Via Marzolo 8, I-35131, Padua, Italy
aj Depto. de Fisica, Pontificia Univ. Católica, C.P. 38071 RJ-22453, Rio de Janeiro, Brazil
ak Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, UK
al Dipartimento di Fisica, Università di Roma II and INFN, Tor Vergata, I-00173, Rome, Italy
am Centre d'Etude de Saclay, DSM/DAPNIA, F-91191, Gif-sur-Yvette Cedex, France
an Dipartimento di Fisica-Università di Salerno, I-84100, Salerno, Italy
ao Istituto Superiore di Sanità, Ist. Naz. di Fisica Nucl. (INFN), Viale Regina Elena 299, I-00161, Rome, Italy
ap C.E.A.F.M., C.S.I.C. - Univ. Cantabria, Avda. los Castros, S/N-39006, Santander, Spain
aq Inst. for High Energy Physics, Serpukov P.O. Box 35, Protvino (Moscow Region, Russian Federation
ar J. Stefan Institute and Department of Physics, University of Ljubljana, Jamova 39, SI-61000, Ljubljana, Slovenia
as Fysikum, Stockholm University, Box 6730, S-113 85, Stockholm, Sweden
at Dipartimento di Fisica Sperimentale, Università di Torino and INFN, Via P. Giuria 1, I-10125, Turin, Italy
au Dipartimento di Fisica, Università di Trieste and INFN, Via A. Valerio 2, I-34127, Trieste, Italy
3 Istituto di Fisica, Università di Udine, I-33100, Udine, Italy
av Department of Radiation Sciences, University of Uppsala, P.O. Box 535, S-751 21, Uppsala, Sweden
aw IFIC, Valencia-CSIC, and D.F.A.M.N., U. de Valencia, Avda. Dr. Moliner 50, E-46100, Burjassot (Valencia, Spain
ay Institut für Hochenergiephysik, Österr. Akad. d. Wissensch., Nikolsdferfergasse 18, A-1050, Vienna, Austria
az Inst. Nuclear Studies and University of Warsaw, Ul. Hoza 69, PL-00681, Warsaw, Poland
ba Fachbereich Physik, University of Wuppertal, Postfach 100 127, D-5600, Wuppertal 1, Germany
Received 28 September 1993.
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
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.






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