Measurements of the tau polarisation in Z0 decays

6533b81ffe1ef96bd1278790

RESEARCH PRODUCT

Measurements of the tau polarisation in Z0 decays

Tiziano Rovelli G. A. Chelkov B. Muryn T. Tabarelli P. Herquet Chiara Mariotti H. Palka J. W. Lamsa M. Blume M. Feindt F. Barao S. Sánchez Navas P. Negri R. Contri E. Higon M. Verlato G. Wormser S. Bosworth F. Scuri F. Scuri A. Passeri A. M. Wetherell C. Lambropoulos Ugo Amaldi W. De Boer E. Zevgolatakos L. Lanceri L. Lanceri Stéphane Plaszczynski Winfried Mitaroff S. Hahn Francesca Romana Cavallo Louis Lyons R. Aleksan N. Neumeister J. Chauveau G. Sciolla P. Rebecchi I. A. Tyapkin H. Rahmani D. Fassouliotis V. V. Lapin Göran Jarlskog Manolis Dris W. Krupinski Stefano Ragazzi G. Vegni R. Henriques P. Roudeau Demetrios Loukas C. De Clercq L. Mundim L. Mundim A. G. Olshevski K. Stepaniak G. Valenti V. Chabaud M. Espirito Santo W. Venus W. Van Doninck J. Dolbeau W. J. Murray H. J. Hilke V. Cassio W. D. Apel Alberto Benvenuti Mariusz Witek Ariella Cattai H. Furstenau M. Gunther F. Ledroit O. Ullaland Leif J. Jönsson I. V. Ajinenko R. Strub Rupert Leitner G. Piana Maria Roberta Monge A. Zalewska Luc Pape R. Nicolaidou F. Pierre H. Wahlen I. Kronkvist Vincent Hedberg O. Podobrin F. Formenti F. Cao C. Defoix P. Bambade Antonio Ferrer G. Smadja J. Van Eldik W. T. Meyer P. Jalocha F. Fulda-quenzer P.s.l. Booth D. W. Lane G. Matthiae B. Dalmagne Lucio Cerrito A. N. Sisakian J.d. Richardson M. A. Winter Richard Jacobsson Jacques Lemonne G. Ekspong J. H. Koehne A. Sadovsky J. P. Gerber P. Carrilho Andrei Nomerotski V. Ruhlmann-kleider Andrea Perrotta K. H. Becks T. S. Hill Laurent Mirabito J. Macnaughton F. Carena Charles Bricman A. Maio P. N. Ratoff E. Graziani J. M. Brunet K. Rybicki Denis Gelé E. Vallazza A. Petrolini S. Simonetti M. Begalli M. Begalli Klaus Hamacher R. Lauhakangas Ph. Charpentier N. Ershaidat B. De Lotto B. De Lotto G. Crosetti Evgueni Vlasov A. Daum B. Franek M. Michelotto R. A. Brenner H. Foeth S. J. Alvsvaag E. Agasi R. Mc Nulty A. Tomaradze M. Battaglia H. Herr G. W. Van Apeldoorn B. Nijjhar F. Zach B. Ueberschaer L. G. Tkatchev J. Bjarne O. Kouznetsov H. De Boeck B. Jean-marie M. Tyndel C. Kreuter Juan Fuster A. G. Frodesen D. J. Holthuizen A. Seitz W. Neumann Martino Margoni L. Ventura K. Yip M. Pernicka Stanislav Nemecek M. Donszelmann M. Berggren A. De Angelis Lydia Roos B. Tome Jesus Marco G. Lenzen C. Martinez-rivero J. Drees E. Fokitis Y. Dufour P. Antilogus Y. Sacquin Danilo Zavrtanik P. Collins Maurizio Canepa G. D. Alekseev E. Torassa R. Lindner Y. Lemoigne P. Abreu T. L. Hessing Sandor Czellar Z. Hajduk Milos Lokajicek Maria Elena Pol Maria Elena Pol J. Dahm S. Katsanevas D. Y. Bardin M. Karlsson V. Kostioukhine M. Koratzinos Pierre Juillot E. Boudinov Evangelos Gazis B. Koene Daniel Bloch Mario Sannino Wolfgang Adam B. Boštjančič G. Polok M. Weierstall P. Bruckman Maciej Górski Ahmimed Ouraou J. Garcia T. A. Filippas M. Regler Juan Abel Barrio Mogens Dam M. Mc Cubbin O. Yushchenko Yu. Belokopytov Phillip Allport F. Hahn G. Della Ricca G. Della Ricca A. Hakansson Tiziano Camporesi Ernesto Migliore Dietrich Liko G. E. Theodosiou K. Hultqvist Georgios Stavropoulos R. Sekulin J. J. Hernandez Christine Kourkoumelis E. Dahl-jensen D. Gillespie Chariclia Petridou Chariclia Petridou Paolo Morettini V. Obraztsov G. Cosme P. J. Holt N. G. Redaelli Branislav Sitar B. Golob R. Ehret L. Chaussard S. C. Blyth G. Wilkinson M. Reale T. Moa G. Maehlum P. V. Chliapnikov Daniel Treille M. Bigi T. Buran Markus Elsing J. Ridky Yu. Sedykh M. Bonesini Sandra Amato José Salt Fares Djama H. Mueller Paolo Ronchese T. Todorov W.s.c. Williams Marco Bozzo I. Roncagliolo P. Frenkiel N. J. Kjaer Kathy Huet Valeriy Pozdniakov Imad Baptiste Laktineh T. Bolognese S. Squarcia H. Saarikko I. Stavitski P. B. Renton William Trischuk Nikita Smirnov D. C. Fries L. Tortora J. G. Loken Paul Baillon Cristian Stanescu C. De Saint-jean P. Beilliere V. Bocci P. Branchini A. Markou E. Cortina R. Zuberi Olga Botner W. Bonivento D. Zontar Alexander Lincoln Read G. Tristram M. Szeptycka Th D. Papadopoulou B. Marechal L. Yu F. J. Harris J. Baudot C. Walck H. Schneider R. Barate G. E. Kalmus V. Chorowicz A. Firestone A. Buys F. Stichelbaut R. Mc Kay A. Andreazza G. Transtromer Carmen García M. Gandelman M. Gandelman M. A. Lopez Aguera S. Lamblot Kerem Cankocak Ugo Gasparini K. A. Drees Carlos Lacasta F. M. L. Almeida Guido Barbiellini Guido Barbiellini J. Guy W. Hao O. Barring A. Baroncelli Marta Calvi P. Van Dam Geoffrey Smith M. Zito A. Normand M. Prest M. Prest Allan Hallgren P. Niss U. Haedinger R. Orava Fernand Grard G. Eigen A. Sokolov Marcos Dracos Tim Adye B. Bouquet R. Keranen Francisco Matorras D. Souza-santos D. Souza-santos Paolo Privitera M. Mazzucato C. De La Vaissiere M. Voutilainen D. Edsall J. M. Lopez Themistocles Bowcock A. Tilquin G. Grosdidier Alessandra Romero Barry King E. Spiriti A. Ruiz R. Frühwirth J. Timmermans A. Lipniacka M. A E Schyns P. H. Kramer Pierre Billoir A. Onofre A. Klovning Y. Arnoud U. Mjoernmark C. Bosio Vaclav Vrba Hans Dijkstra Piotr Zalewski F. Simonetto G. Leder H. T. Phillips Vladimir Cindro M. J. Bates B. ÅSman V. Lefebure D. Crennell F. Dupont Toralf Bernhard Skaali V.a. Uvarov D. Bertrand F. Mandl D. Gamba L. Di Ciaccio J. N. Jackson J. Rames Jan Krolikowski N. N. Khovanski W. Bartl P. Kokkinias A. Lopez-fernandez C. K. Legan R. Sosnowski C. Gaspar F. Verbeure P. Vincent F. Naraghi W. Ruckstuhl G. C. Zucchelli J. P. Laugier R. Moeller V. Lepeltier M. L. Andrieux Paolo Checchia Ph. Gavillet M. Kaiser Wojciech Kucewicz L. K. Resvanis Claire Bourdarios P. Paganini P. Beltran P. Kubinec Massimo Caccia B. Stugu Vladimir Nikolaenko Clara Troncon J. P. Tavernet M. S. Bilenky L.j. Carroll J. Medbo Borge Svane Nielsen Fabio Cossutti Fabio Cossutti Luis Peralta F. Kapusta S. De Brabandere Krzysztof Doroba P. Weilhammer G. Borisov Chiara Meroni T. Lesiak A. Pullia M. Baubillier Achille Stocchi V. Canale I. Lippi Peter Kluit J. H. Wickens Marco Paganoni Jose Luis Contreras A. M. Zaitsev Alexander Vodopyanov F. Bianchi L. Vitale L. Vitale F. Martinez-vidal D. Radojicic M. Pimenta B. A. Khomenko P. Delpierre Francesco Navarria H. Pernegger Manfred Krammer P. Lutz P. Langefeld T. Maron G. Myatt L. Gorn Marek Szczekowski E. Karvelas Z. Krumstein A. De Min E. Rosso H. Klein J. Cuevas Maestro K. D. Brand J. Pennanen Tord Ekelof A. Trombini I. Siccama G. Sajot K. Osterberg H. Staeck N. I. Zimin B. Loerstad S. Ueberschaer M. Wielers E. K. Johansson O. Smirnova Robert S. Brown Steinar Stapnes A. Maltezos A. Miagkov C. Joram Matteo Pegoraro M. L. Turluer D. Reid Patrick Jarry G. Rinaudo V. Malychev P. Pages E. I. Rosenberg L. Bugge A. J. Camacho Rozas Gary John Barker K. Kurvinen D. Z. Toet P. Siegrist D. Wicke Javier Sánchez K. Woschnagg I. Ripp Gianni Zumerle R. Janik E. C. Katsoufis G. Gopal L. De Paula P. Poropat P. Poropat Andromachi Tsirou Andre Augustinus A. Wehr D. Vilanova J-c. Marin R. Gokieli P. Gunnarsson Spyros Tzamarias O. Tchikilev M. Davenport S. O. Holmgren L. S. Vertogradov W. Oberschulte-beckmann R. C. Shellard R. C. Shellard Josef Hrubec A. M. Segar F. Fontanelli J. P. Engel M. V. Castillo Gimenez Paul Dauncey N. Demaria G. Damgaard V. Gracco Pavlos Ioannou Klaus Mönig Fabrizio Parodi M. A. Houlden S. Marti I Garcia J. E. Augustin S. Haider C. Caso H. B. Crawley L. Brillault W. Da Silva F. Richard P. Chochula C. Matteuzzi M. Hahn S. Almehed C. Vander Velde

subject

Particle physics POLARIZATION Physics and Astronomy (miscellaneous)LUND MONTE-CARLO Electron–positron annihilation Hadron LEP-SLC ENERGIES Electron 01 natural sciences Partícules (Física nuclear)JET FRAGMENTATION PARAMETERS Nuclear physics PHYSICS BHABHA SCATTERING Z-RESONANCE 0103 physical sciences radiative correction [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RADIATIVE-CORRECTIONS 010306 general physics Engineering (miscellaneous)Detectors de radiació Bhabha scattering DELPHI Physics 010308 nuclear & particles physics Detector tau polarization Polarization (waves)LARGE ELECTRON POSITRON COLLIDER Universality (dynamical systems)Z resonance LUND MONTE-CARLO; LEP-SLC ENERGIES; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; JET FRAGMENTATION; Z-RESONANCE; POLARIZATION; PHYSICS; SIMULATION; PARAMETERS SIMULATION PARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHI PARTICLE PHYSICS High Energy Physics::Experiment DELPHI; tau polarization; radiative correction; Z resonance Particle Physics - Experiment Lepton

description

A sample of Z0→τ+τ- events observed in the DELPHI detector at LEP in 1991 and 1992 is analysed to measure the τ polarisation in the exclusive decay channels {Mathematical expression}, {Mathematical expression}, πν, ρν and a1ν. The τ polarisation is also measured with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision than the use of the exclusive decay modes. The results have been combined with those published on the 1990 data. A measurement of the τ polarisation as a function of production angle yields the values for the mean τ polarisation 〈P〉τ=-0.148±0.022 and for the Z0 polarisation PZ=-0.136±0.027. These results are used to determine the ratio of vector to axial-vector effective couplings for taus {Mathematical expression}, and for electrons {Mathematical expression}, compatible with e-τ universality. With the assumption of lepton universality, the ratio of vector to axial-vector effective couplings for leptons {Mathematical expression} is obtained, implying a value of the effective weak mixing angle sin2θefflept=0.2320±0.0021 . © 1995 Springer-Verlag.

year	journal	country	edition	language
1995-06-01

10.1007/bf01571280 http://hdl.handle.net/11368/2574843