Lambda b polarization in Z 0 decays at LEP

Paulo Cesar Abreu,W Adam,T Adye,P Adzic,I Ajinenko,Z Albrecht,T Alderweireld,G D Alekseev,R Alemany,T Allmendinger,P P Allport,S Almehed,U Amaldi,N Amapane,S Amato,E G Anassontzis,Patrik L Andersson,A Andreazza,S Andringa,P Antilogus,W D Apel, Y Arnoud,B Asman,J E Augustin,A Augustinus, P Baillon,P Bambade,F Barao,G Barbiellini,R Barbier,D Y Bardin,G J Barker,A Baroncelli,M Battaglia,M Baubillier,K H Becks,M Begalli,A Behrmann,P Beilliere,Yu Belokopytov,N Benekos,A C Benvenuti,C Berat,M Berggren,D Bertini,D Bertrand,M Besancon,M Bigi,M S Bilenky,M A Bizouard,D Bloch,H M Blom,M Bonesini,W Bonivento,M Boonekamp,P S L Booth,A W Borgland,G Borisov,C Bosio,O Botner,E Boudinov,B Bouquet,C Bourdarios,T J V Bowcock,I Boyko,I Bozovic,M Bozzo,M Bracko,P Branchini,R Brenner,P Bruckman,J M Brunet,L Bugge,T Buran,B Buschbeck,P Buschmann,S Cabrera,M Caccia,M Calvi,T Camporesi,V Canale,F Carena,L Carroll,C Caso, M V C Gimenez,A Cattai,F R Cavallo,V Chabaud,Ph Charpentier,L Chaussard,P Checchia,G A Chelkov,R Chierici,P Chliapnikov,P Chochula,V Chorowicz,J Chudoba,K Cieslik,P Collins,R Contri,E Cortina,G Cosme,F Cossutti,H B Crawley,D Crennell,S Crepe,G Crosetti,J C Maestro,S Czellar,M Davenport,W Da Silva,G Della Ricca,P Delpierre,N Demaria,A De Angelis,W De Boer,C De Clercq,B De Lotto,A De Min,L De Paula,H Dijkstra,L Di Ciaccio,J Dolbeau,K Doroba,M Dracos,J Drees,M Dris,A Duperrin,J D Durand,G Eigen,Tord Ekelof,G Ekspong,Mattias Ellert,M Elsing,J P Engel,M E Santo,G Fanourakis,D Fassouliotis,J Fayot,M Feindt,A B Fenyuk,P Ferrari,Antonio Ferrer,E Ferrerribas,F Ferro,S Fichet,A Firestone,U Flagmeyer,H Foeth,E Fokitis,F Fontanelli,B Franek, A G Frodesen,R Fruhwirth,F Fuldaquenzer,J Fuster,A Galloni,D Gamba,S Gamblin,M Gandelman,Carmen Garcia,C Gaspar,M Gaspar,U Gasparini,Ph Gavillet,E N Gazis,D Gele,N Ghodbane,I Gil,F Glege,R Gokieli,B Golob,G Gomezceballos,P Goncalves,Isidro Gonzalez Caballero,G P Gopal,L Gorn,Yu Gouz,V Gracco,J Grahl,E Graziani,Phillipe Luc Gris,G Grosdidier,K Grzelak,J Guy,F Hahn,Seungyong Hahn,S Haider,A Hallgren,K Hamacher,J B Hansen,F J Harris,V Hedberg,S Heising,J J Hernandez,P Herquet,H Herr,T L Hessing,J Heuser,E Higon,S O Holmgren, P J Holt,S Hoorelbeke,M Houlden,J Hrubec,Martin C E Huber,K Huet,G Hughes,K Hultqvist,J N Jackson,R Jacobsson,P Jalocha,R Janik,C Jarlskog,G Jarlskog,P Jarry,B Jeanmarie,D Jeans,E K Johansson,P Jonsson,C Joram,P Juillot,L Jungermann,F Kapusta,K E Karafasoulis,S Katsanevas,E C Katsoufis,R Keranen,G Kernel,B P Kersevan,B A Khomenko,N N Khovanski,A Kiiskinen,Barry King,A Kinvig,N J Kjaer,O Klapp,H Klein,P Kluit,P Kokkinias,V Kostioukhine,C Kourkoumelis,O Kouznetsov,Manfred Krammer,E Kriznic,Z Krumstein,P Kubinec,J Kurowska,K Kurvinen,J W Lamsa,D W Lane,V Lapin,J P Laugier,R Lauhakangas,G Leder

PHYSICS LETTERS B（2000）

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摘要

The longitudinal polarization of the Lambda(b) baryon is measured at the LEP e(+)e(-) collider by DELPHI. It is determined from the charged lepton and neutrino energy spectra in 249 +/- 19 Lambda(b) semileptonic decays reconstructed in approximate to 3.5 million hadronic Z(0) decays using Lambda(0)-lepton correlations. The measured polarization is: P-Lambda b = -0.49(-0.30)(+0.32)(stat.) +/- 0.17(syst.). (C) Elsevier Science B.V. All rights reserved.

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