In a study of the reaction e−e+→W−W+ with the DELPHI detector, the probabilities of the two W particles occurring in the joint polarisation states transverse–transverse (T T ), longitudinal–transverse plus transverse–longitudinal (LT ) and longitudinal–longitudinal (LL) have been determined using the final states WW→lνq¯q (l = e,μ). The two-particle joint polarisation probabilities, i.e. the spin density matrix elements ρT T , ρLT , ρLL, are measured as functions of the W− production angle, θW−, at an average reaction energy of 198.2 GeV. Averaged over all cos θW−, the following joint probabilities are obtained: ρ¯T T = (67±8)%, ρ¯LT = (30± 8)%, ρ¯LL = (3 ±7)%. These results are in agreement with the StandardModel predictions of 63.0%, 28.9% and 8.1%, respectively. The related polarisation cross-sections σT T , σLT and σLL are also presented.

Correlations between polarisation states of W particles in the reaction e− e+ → W− W+ at LEP2 energies 189–209 GeV

NAVARRIA, FRANCESCO LUIGI;PAIANO, SIMONE;PERROTTA, ANDREA;ROVELLI, TIZIANO;
2009

Abstract

In a study of the reaction e−e+→W−W+ with the DELPHI detector, the probabilities of the two W particles occurring in the joint polarisation states transverse–transverse (T T ), longitudinal–transverse plus transverse–longitudinal (LT ) and longitudinal–longitudinal (LL) have been determined using the final states WW→lνq¯q (l = e,μ). The two-particle joint polarisation probabilities, i.e. the spin density matrix elements ρT T , ρLT , ρLL, are measured as functions of the W− production angle, θW−, at an average reaction energy of 198.2 GeV. Averaged over all cos θW−, the following joint probabilities are obtained: ρ¯T T = (67±8)%, ρ¯LT = (30± 8)%, ρ¯LL = (3 ±7)%. These results are in agreement with the StandardModel predictions of 63.0%, 28.9% and 8.1%, respectively. The related polarisation cross-sections σT T , σLT and σLL are also presented.
J. ABDALLAH; P. ABREU; W. ADAM; P. ADZIC; T. ALBRECHT; R. ALEMANY-FERNANDEZ; T. ALLMENDINGER; P. P. ALLPORT; U. AMALDI; N. AMAPANE; S. AMATO; E. ANASHKIN; A. ANDREAZZA; S. ANDRINGA; N. ANJOS; P. ANTILOGUS; W-D. APEL; Y. ARNOUD; S. ASK; B. ASMAN; J. E. AUGUSTIN; A. AUGUSTINUS; P. BAILLON; A. BALLESTRERO; P. BAMBADE; R. BARBIER; D. BARDIN; G. J. BARKER; A. BARONCELLI; M. BATTAGLIA; M. BAUBILLIER; K-H. BECKS; M. BEGALLI; A. BEHRMANN; E. BEN-HAIM; N. BENEKOS; A. BENVENUTI; C. BERAT; M. BERGGREN; D. BERTRAND; M. BESANCON; N. BESSON; D. BLOCH; M. BLOM; M. BLUJ; M. BONESINI; M. BOONEKAMP; P. S. L. BOOTH; G. BORISOV; O. BOTNER; B. BOUQUET; T. J. V. BOWCOCK; I. BOYKO; M. BRACKO; R. BRENNER; E. BRODET; P. BRUCKMAN; J. M. BRUNET; B. BUSCHBECK; P. BUSCHMANN; M. CALVI; T. CAMPORESI; V. CANALE; F. CARENA; N. CASTRO; F. CAVALLO; M. CHAPKIN; PH. CHARPENTIER; P. CHECCHIA; R. CHIERICI; P. CHLIAPNIKOV; J. CHUDOBA; S. U. CHUNG; K. CIESLIK; P. COLLINS; R. CONTRI; G. COSME; F. COSSUTTI; M. J. COSTA; D. CRENNELL; J. CUEVAS; J. D’HONDT; T. DA SILVA; W. DA SILVA; G. DELLA RICCA; A. DE ANGELIS; W. DE BOER; C. DE CLERCQ; B. DE LOTTO; N. DE MARIA; A. DE MIN; L. DE PAULA; L. DI CIACCIO; A. DI SIMONE; K. DOROBA; J. DREES; G. EIGEN; T. EKELOF; M. ELLERT; M. ELSING; M. C. ESPIRITO SANTO; G. FANOURAKIS; D. FASSOULIOTIS; M. FEINDT; J. FERNANDEZ; A. FERRER; F. FERRO; U. FLAGMEYER; H. FOETH; E. FOKITIS; F. FULDA-QUENZER; J. FUSTER; M. GANDELMAN; C. GARCIA; PH. GAVILLET; E. GAZIS; R. GOKIELI; B. GOLOB; G. GOMEZ-CEBALLOS; P. GONCALVES; E. GRAZIANI; G. GROSDIDIER; K. GRZELAK; J. GUY; C. HAAG; A. HALLGREN; K. HAMACHER; K. HAMILTON; S. HAUG; F. HAULER; V. HEDBERG; M. HENNECKE; J. HOFFMAN; S-O. HOLMGREN; P. J. HOLT; M. A. HOULDEN; J. N. JACKSON; G. JARLSKOG; P. JARRY; D. JEANS; E. K. JOHANSSON; P. JONSSON; C. JORAM; L. JUNGERMANN; F. KAPUSTA; S. KATSANEVAS; E. KATSOUFIS; G. KERNEL; B. P. KERSEVAN; U. KERZEL; B. T. KING; N. J. KJAER; P. KLUIT; P. KOKKINIAS; C. KOURKOUMELIS; O. KOUZNETSOV; Z. KRUMSTEIN; M. KUCHARCZYK; J. LAMSA; G. LEDER; F. LEDROIT; L. LEINONEN; R. LEITNER; J. LEMONNE; V. LEPELTIER; T. LESIAK; W. LIEBIG; D. LIKO; A. LIPNIACKA; J. H. LOPES; J. M. LOPEZ; D. LOUKAS; P. LUTZ; L. LYONS; J. MACNAUGHTON; A. MALEK; S. MALTEZOS; F. MANDL; J. MARCO; R. MARCO; B. MARECHAL; M. MARGONI; J-C. MARIN; C. MARIOTTI; A. MARKOU; C. MARTINEZ-RIVERO; J. MASIK; N. MASTROYIANNOPOULOS; F. MATORRAS; C. MATTEUZZI; F. MAZZUCATO; M. MAZZUCATO; R. MC NULTY; C. MERONI; E. MIGLIORE; W. MITAROFF; U. MJOERNMARK; T. MOA; M. MOCH; K. MOENIG; R. MONGE; J. MONTENEGRO; D. MORAES; S. MORENO; P. MORETTINI; U. MUELLER; K. MUENICH; M. MULDERS; L. MUNDIM; W. MURRAY; B. MURYN; G. MYATT; T. MYKLEBUST; M. NASSIAKOU; F. NAVARRIA; K. NAWROCKI; S. NEMECEK; R. NICOLAIDOU; M. NIKOLENKO; A. OBLAKOWSKA-MUCHA; V. OBRAZTSOV; A. OLSHEVSKI; A. ONOFRE; R. ORAVA; K. OSTERBERG; A. OURAOU; A. OYANGUREN; M. PAGANONI; S. PAIANO; J. P. PALACIOS; H. PALKA; TH. D. PAPADOPOULOU; L. PAPE; C. PARKES; F. PARODI; U. PARZEFALL; A. PASSERI; O. PASSON; L. PERALTA; V. PEREPELITSA; A. PERROTTA; A. PETROLINI; J. PIEDRA; L. PIERI; F. PIERRE; M. PIMENTA; E. PIOTTO; T. PODOBNIK; V. POIREAU; M. E. POL; G. POLOK; V. POZDNIAKOV; N. PUKHAEVA; A. PULLIA; D. RADOJICIC; P. REBECCHI; J. REHN; D. REID; R. REINHARDT; P. RENTON; F. RICHARD; J. RIDKY; M. RIVERO; D. RODRIGUEZ; A. ROMERO; P. RONCHESE; P. ROUDEAU; T. ROVELLI; V. RUHLMANN-KLEIDER; D. RYABTCHIKOV; A. SADOVSKY; L. SALMI; J. SALT; C. SANDER; A. SAVOY-NAVARRO; U. SCHWICKERATH; R. SEKULIN; M. SIEBEL; A. SISAKIAN; G. SMADJA; O. SMIRNOVA; A. SOKOLOV; A. SOPCZAK; R. SOSNOWSKI; T. SPASSOV; M. STANITZKI; A. STOCCHI; J. STRAUSS; B. STUGU; M. SZCZEKOWSKI; M. SZEPTYCKA; T. SZUMLAK; T. TABARELLI; F. TEGENFELDT; J. TIMMERMANS; L. TKATCHEV; M. TOBIN; S. TODOROVOVA; B. TOME; A. TONAZZO; P. TORTOSA; P. TRAVNICEK; D. TREILLE; G. TRISTRAM; M. TROCHIMCZUK; C. TRONCON; M-L. TURLUER; I. A. TYAPKIN; P. TYAPKIN; S. TZAMARIAS; V. UVAROV; G. VALENTI; P. VAN DAM; J. VAN ELDIK; N. VAN REMORTEL; I. VAN VULPEN; G. VEGNI; F. VELOSO; W. VENUS; P. VERDIER; V. VERZI; D. VILANOVA; L. VITALE; V. VRBA; H. WAHLEN; A. J. WASHBROOK; C. WEISER; D. WICKE; J. WICKENS; G. WILKINSON; M. WINTER; M. WITEK; O. YUSHCHENKO; A. ZALEWSKA; P. ZALEWSKI; D. ZAVRTANIK; V. ZHURAVLOV; N. I. ZIMIN; A. ZINTCHENKO; M. ZUPAN
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/82397
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