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Titolo:
A FIRST MEASUREMENT OF THE LAMBDA(LAMBDA)OVER-BAR AND LAMBDA-LAMBDA ((LAMBDA)OVER-BAR(LAMBDA)OVER-BAR) SPIN COMPOSITIONS IN HADRONIC Z(0) DECAYS
Autore:
ALEXANDER G; ALLISON J; ALTEKAMP N; AMETEWEE K; ANDERSON KJ; ANDERSON S; ARCELLI S; ASAI S; AXEN D; AZUELOS G; BALL AH; BARBERIO E; BARLOW RJ; BARTOLDUS R; BATLEY JR; BEAUDOIN G; BECHTLUFT J; BEESTON C; BEHNKE T; BELL AN; BELL KW; BELLA G; BENTVELSEN S; BERLICH P; BETHKE S; BIEBEL O; BLOBEL V; BLOODWORTH IJ; BLOOMER JE; BOCK P; BOSCH HM; BOUTEMEUR M; BOUWENS BT; BRAIBANT S; BROWN RM; BURCKHART HJ; BURGARD C; BURGIN R; CAPILUPPI P; CARNEGIE RK; CARTER AA; CARTER JR; CHANG CY; CHARLESWORTH C; CHARLTON DG; CHRISMAN D; CHU SL; CLARKE PEL; COHEN I; CONBOY JE; COOKE OC; CUFFIANI M; DADO S; DALLAPICCOLA C; DALLAVALLE GM; DEJONG S; DELPOZO LA; DESCH K; DIXIT MS; SILVA EDCE; DOUCET M; DUCHOVNI E; DUCKECK G; DUERDOTH IP; EDWARDS JEG; ESTABROOKS PG; EVANS HG; EVANS M; FABBRI F; FATH P; FIEDLER F; FIERRO M; FISCHER HM; FOLMAN R; FONG DG; FOUCHER M; FUKUI H; FURTJES A; GAGNON P; GAIDOT A; GARY JW; GASCON J; GASCONSHOTKIN SM; GEDDES NI; GEICHGIMBEL C; GENTIT FX; GERALIS T; GIACOMELLI G; GIACOMELLI P; GIACOMELLI R; GIBSON V; GIBSON WR; GINGRICH DM; GOLDBERG J; GOODRICK MJ; GORN W; GRANDI C; GROSS E; GRUWE M; HAJDU C; HANSON GG; HANSROUL M; HAPKE M; HARGROVE CK; HART PA; HARTMANN C; HAUSCHILD M; HAWKES CM; HAWKINGS R; HEMINGWAY RJ; HERTEN G; HEUER RD; HILDRETH MD; HILL JC; HILLIER SJ; HILSE T; HOARE J; HOBSON PR; HOMER RJ; HONMA AK; HORVATH D; HOWARD R; HUGHESJONES RE; HUTCHCROFT DE; IGOKEMENES P; IMRIE DC; INGRAM MR; JAWAHERY A; JEFFREYS PW; JEREMIE H; JIMACK M; JOLY A; JONES CR; JONES G; JONES M; JONES RWL; JOST U; JOVANOVIC P; JUNK TR; KARLEN D; KAWAGOE K; KAWAMOTO T; KEELER RK; KELLOGG RG; KENNEDY BW; KING BJ; KIRK J; KLUTH S; KOBAYASHI T; KOBEL M; KOETKE DS; KOKOTT TP; KOMAMIYA S; KOWALEWSKI R; KRESS T; KRIEGER P; VONKROGH J; KYBERD P; LAFFERTY GD; LAFOUX H; LAHMANN R; LAI WP; LANSKE D; LAUBER J; LAUTENSCHLAGER SR; LAYTER JG; LAZIC D; LEE AM; LEFEBVRE E; LELLOUCH D; LETTS J; LEVINSON L; LEWIS C; LLOYD SL; LOEBINGER FK; LONG GD; LOSTY MJ; LUDWIG J; LUIG A; MALIK A; MANNELLI M; MARCELLINI S; MARKUS C; MARTIN AJ; MARTIN JP; MARTINEZ G; MASHIMO T; MATTHEWS W; MATTIG P; MCDONALD WJ; MCKENNA J; MCKIGNEY EA; MCMAHON TJ; MCNAB AI; MCPHERSON RA; MEIJERS F; MENKE S; MERRITT FS; MES H; MEYER J; MICHELINI A; MIKENBERG G; MILLER DJ; MIR R; MOHR W; MONTANARI A; MORI T; MORII M; MULLER U; NEAL HA; NELLEN B; NIJJHAR B; NISIUS R; ONEALE SW; OAKHAM FG; ODORICI F; OGREN HO; OMORI T; OREGLIA MJ; ORITO S; PALINKAS J; PANSART JP; PASZTOR G; PATER JR; PATRICK GN; PEARCE MJ; PETZOLD S; PFEIFENSCHNEIDER P; PILCHER JE; PINFOLD J; PLANE DE; POFFENBERGER P; POLI B; POSTHAUS A; PRZYSIEZNIAK H; REES DL; RIGBY D; ROBINS SA; RODNING N; RONEY JM; ROOKE A; ROS E; ROSSI AM; ROSVICK M; ROUTENBURG P; ROZEN Y; RUNGE K; RUNOLFSSON O; RUPPEL U; RUST DR; RYLKO R; SARKISYAN EKG; SASAKI M; SBARRA C; SCHAILE AD; SCHAILE O; SCHARF F; SCHARFFHANSEN P; SCHENK P; SCHMITT B; SCHMITT S; SCHRODER M; SCHULTZCOULON HC; SCHULZ M; SCHUTZ P; SCOTT WG; SHEARS TG; SHEN BC; SHEPHERDTHEMISTOCLEOUS CH; SHERWOOD P; SIROLI GP; SITTLER A; SKILLMAN A; SKUJA A; SMITH AM; SMITH TJ; SNOW GA; SOBIE R; SOLDNERREMBOLD S; SPRINGER RW; SPROSTON M; STAHL A; STARKS M; STEIERT M; STEPHENS K; STEUERER J; STOCKHAUSEN B; STROM D; STRUMIA F; SZYMANSKI P; TAFIROUT R; TALBOT SD; TANAKA S; TARAS P; TAREM S; TECCHIO M; THIERGEN M; THOMSON MA; VONTORNE E; TOWERS S; TSCHEULIN M; TSUKAMOTO T; TSUR E; TURCOT AS; TURNERWATSON MF; UTZAT P; VANKOOTEN R; VASSEUR G; VERZOCCHI M; VIKAS P; VINCTER M; VOKURKA EH; WACKERLE F; WAGNER A; WARD CP; WARD DR; WARD JJ; WATKINS PM; WATSON AT; WATSON NK; WEBER P; WELLS PS; WERMES N; WHITE JS; WILKENS B; WILSON GW; WILSON JA; WLODEK T; WOLF G; WOTTON S; WYATT TR; YAMASHITA S; YEKUTIELI G; ZACEK V;
Titolo Testata:
Physics letters. Section B
fascicolo: 1-4, volume: 384, anno: 1996,
pagine: 377 - 387
SICI:
0370-2693(1996)384:1-4<377:AFMOTL>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
LUND MONTE-CARLO; OPAL JET CHAMBER; MICROVERTEX DETECTOR; BARYON PRODUCTION; E+E-PHYSICS; FRAGMENTATION; LEP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
G. Alexander et al., "A FIRST MEASUREMENT OF THE LAMBDA(LAMBDA)OVER-BAR AND LAMBDA-LAMBDA ((LAMBDA)OVER-BAR(LAMBDA)OVER-BAR) SPIN COMPOSITIONS IN HADRONIC Z(0) DECAYS", Physics letters. Section B, 384(1-4), 1996, pp. 377-387

Abstract

The spin composition of <Lambda(Lambda)over bar>, Lambda Lambda and <(Lambda)over bar><(Lambda)over bar> pairs at low invariant mass valueshas been measured for the first time in multihadronic Z(0) decays with the OPAL detector at LEP. No single spin state has been observed in the <Lambda(Lambda)over bar> sample, verifying that the low mass enhancement in this sample, attributed to local baryon number compensation,is not a resonance state. The fraction of the spin 1 contribution to the <Lambda(Lambda)over bar> pairs was found to be consistent with thevalue 0.75, as expected from a statistical spin mixture. This may be the net effect of many different QCD processes which contribute to thehyperon anti-hyperon pair production. The spin composition of the identical Lambda Lambda and <(Lambda)over bar(Lambda)over bar> pairs, well above threshold, is found to be similar to that of the <Lambda(Lambda)over bar> sample. A Lambda Lambda emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.

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Documento generato il 05/12/20 alle ore 08:00:28