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Correlations between Polarisation States of W Particles in the Reaction e-e+ -> W-W+ at LEP2 Energies 189-209 GeV

J. Abdallah 1 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 1 W.-D. Apel Y. Arnoud 2 S. Ask B. Asman J.-E. Augustin 1 A. Augustinus P. Baillon A. Ballestrero P. Bambade 3 R. Barbier 4 D. Bardin G. J. Barker A. Baroncelli M. Battaglia M. Baubillier 1 K.-H. Becks M. Begalli A. Behrmann E. Ben-Haim 3 N. Benekos A. Benvenuti C. Bérat M. Berggren 1 D. Bertrand M. Besancon 5 N. Besson 5 D. Bloch 6 M. Blom M. Bluj M. Bonesini M. Boonekamp 5 P.S.L. Booth G. Borisov O. Botner B. Bouquet 3 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 3 F. Cossutti M.J. Costa D. Crennell J. Cuevas J. d'Hondt T. da Silva W. da Silva 1 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 3 J. Fuster M. Gandelman C. Garcia Ph. Gavillet E. Gazis R. Gokieli B. Golob G. Gomez-Ceballos P. Goncalves E. Graziani G. Grosdidier 3 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 5 D. Jeans E.K. Johansson P. Jonsson C. Joram L. Jungermann F. Kapusta 1 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 2 L. Leinonen R. Leitner J. Lemonne V. Lepeltier 3 T. Lesiak W. Liebig D. Liko A. Lipniacka J.H. Lopes J.M. Lopez D. Loukas P. Lutz 5 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 5 M. Nikolenko A. Oblakowska-Mucha V. Obraztsov A. Olshevski A. Onofre R. Orava K. Osterberg A. Ouraou 5 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 5 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 3 J. Ridky M. Rivero D. Rodriguez A. Romero P. Ronchese P. Roudeau 3 T. Rovelli V. Ruhlmann-Kleider 5 D. Ryabtchikov A. Sadovsky L. Salmi J. Salt C. Sander A. Savoy-Navarro 1 U. Schwickerath R. Sekulin M. Siebel A. Sisakian G. Smadja O. Smirnova A. Sokolov A. Sopczak R. Sosnowski T. Spassov M. Stanitzki A. Stocchi 3 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 7 Pablo Tortosa P. Travnicek D. Treille G. Tristram 8 M. Trochimczuk C. Troncon M.-L. Turluer 5 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 4 V. Verzi D. Vilanova 5 L. Vitale V. Vrba H. Wahlen A. J. Washbrook C. Weiser D. Wicke J. Wickens G. Wilkinson M. Winter 6 M. Witek O. Yushchenko A. Zalewska P. Zalewski D. Zavrtanik V. Zhuravlov N.I. Zimin A. Zintchenko M. Zupan
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 (TT), longitudinal-transverse plus transverse-longitudinal (LT) and longitudinal-longitudinal (LL) have been determined using the final states WW -> l nu q qbar (l = e, mu). The two-particle joint polarisation probabilities, i.e. the spin density matrix elements rho_TT, rho_LT, rho_LL, are measured as functions of the W- production angle, theta_W-, at an average reaction energy of 198.2 GeV. Averaged over all cos(theta_W-), the following joint probabilities are obtained: rho_TT = (67 +/- 8)%, rho_LT = (30 +/- 8)%, rho_LL = (3 +/- 7)% . These results are in agreement with the Standard Model predictions of 63.0%, 28.9% and 8.1%, respectively. The related polarisation cross-sections sigma_TT, sigma_LT and sigma_LL are also presented.
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Submitted on : Tuesday, August 11, 2009 - 10:33:39 AM
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J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. Correlations between Polarisation States of W Particles in the Reaction e-e+ -> W-W+ at LEP2 Energies 189-209 GeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2009, 63, pp.611-623. ⟨10.1140/epjc/s10052-009-1123-y⟩. ⟨in2p3-00409629⟩

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