Search for charginos nearly mass degenerate with the lightest neutralino in e+e− collisions at centre-of-mass energies up to 209 GeV

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RESEARCH PRODUCT

Search for charginos nearly mass degenerate with the lightest neutralino in e+e− collisions at centre-of-mass energies up to 209 GeV

A. Trabelsi A. Trabelsi Paul Hanke J.j. Ward J. A. Strong C. N. Booth E. Simopoulou G. Giannini J. Jousset Pierluigi Campana Andrea Giammanco F. Murtas A. J. Finch J. H. Von Wimmersperg-toeller J. Nielsen Fabrizio Palla A. Misiejuk S. Wasserbaech Hasko Stenzel G. Parrini S. Gonzalez K. Tittel P. Colas Konrad Kleinknecht S. Schael H. Hu W. Zhao Piero Giorgio Verdini P. Perez Ramon Miquel A. S. Thompson J. D. Hansen W. Tejessy A. Bonissent Maria Smizanska P. R. Norton B. Michel G. Sanguinetti Patrick Janot Benjamin Trocmé D. Fouchez C. Markou Yuehong Xie Giuseppe Bagliesi Djamel Eddine Boumediene A. Garcia-bellido A. Sciabà G. Merino S.r. Armstrong M. Fernandez-bosman M. De Palma Fabio Cerutti Boris Tuchming R. W. Clifft Duccio Abbaneo Ian R Tomalin Elizabeth Locci Giovanna Selvaggi Christophe Delaere C. Loomis E. Merle John-bjarne Hansen Vitaliano Chiarella Claus Grupen Tommaso Boccali M. Wunsch Timothy Barklow Timothy Barklow R. Bruneliere J.g. Lynch I. Videau Roger Forty Stephane Jezequel Donato Creanza John T Harvey H. G. Moser P. H. Hansen Jie Zhang Marumi Kado Marumi Kado L. Rolandi C. Curtil Alan Litke B. Pietrzyk Alessandro Giassi L. Passalacqua Francesco Ragusa A. Jacholkowska Mario Maggi Gy. Wolf Miriam Lucio Martinez Dominique Pallin Vitaliano Ciulli Lucia Silvestris Giuseppe Zito P. Coyle S. Dhamotharan S. Dhamotharan Andrea Valassi G. A. Cowan A. W. Halley A. Moutoussi Ting Wang Paul Hodgson J. C. Brient Lei Zhang Ettore Focardi John Rander Giuseppe Raso B. Renk K. Affholderbach R. Xu L. Duflot S.a. Rutherford Anna Colaleo J. J. Veillet D.p. Clarke Massimo Antonelli J. Kile F. Ranjard David Paneque G. Mannocchi N. De Filippis J. Boucrot S. Monteil G. Capon Georg Zobernig S. Jin Emmerich Kneringer A. Rosowsky Pere Mato F. Bossi M. G. Green B. Vallage Maria Girone Maria Girone G. Rudolph A. Ngac Paolo Azzurri O. Buchmüller O. Buchmüller Franco Ligabue F. Teubert Günther Dissertori Val O'shea Gunter Quast Gunter Quast J. Putz A.-s. Müller J. Kennedy Eric Lancon J. K. Sedgbeer T. Medcalf M. Davier J. Hess U. Blumenschein K. Zachariadou Arno Heister Xin Wu J. Rothberg N. Konstantinidis R. White Nancy Marinelli K. Hüttmann H. Drevermann Maria Pilar Casado Marco Cattaneo M.-n. Minard A. Ranieri W. Männer C. Goy John H. L. Hansen T.c. Greening T.c. Greening J.m. Pascolo N. A. Robertson Alessia Tricomi Ll. M. Mir M.r. Pearson S. Bravo X. Huang Paolo Laurelli A. Rougé S. Schmeling Chang-zheng Yuan O. Van Der Aa Christian Zeitnitz J. P. Lees A. Vayaki G.a. Blair Gerardo Ganis Gerardo Ganis M. C. Lemaire Y. S. Gao Y. S. Gao R. Beuselinck A. Böhrer P. A. Mcnamara Giacomo Sguazzoni M H. Lehto G. Ellis Ph. Heusse G. B. Taylor P. Tempesta D. Fayolle T. R. Edgecock O. Awunor Gavin Davies M. Chmeissani Laurent Serin Sau Lan Wu A. Tilquin J. M. Crespo H. G. Sander V. M. Ghete G.p. Murtas F. Martin G. Lütjens David Hutchcroft D. Decamp Qun Ouyang Aristotelis Kyriakis J. Nowell K. Berkelman S. Dessagne C. Geweniger U. Sieler E. E. Kluge A. Blondel H. He Alain Falvard R. Barate I. De Bonis H. Wachsmuth D. Schlatter Jean-francois Grivaz P. Negus Werner Wiedenmann Junjie Wu P. J. Dornan A. David E. Fernandez Roberto Tenchini Roberto Tenchini E. Grauges P. Perret F. Machefert G. Leibenguth H. Ruiz W. Cameron F. Hölldorfer F. Foster A. Pacheco Markus Frank F. Gianotti G. Bencivenni Barbara Clerbaux Reisaburo Tanaka F. Combley P. Seager Karl Jakobs T. Ziegler C. K. Bowdery B. Fabbro H. Videau R.d. Hill Andrea Venturi Andrea Venturi H. Dietl F. Badaud S. L. Cartwright Jiali Lin J.c. Thompson D.p.s. Ferguson G. Maggi Pedro Teixeira-dias Salvatore Nuzzo Evelina Vassileva Bouhova-thacker B. Bloch-devaux Richard Cavanaugh Richard Cavanaugh Jairo Alexis Rodriguez Lopez G. Hughes B.s. Nilsson P. Payre S. Xue L.t. Jones Giuseppe Iaselli A. Putzer M. Swynghedauw F. Kayser P. Girtler Lorenzo Foà C. Borean Y. B. Pan F. Ruggieri G. Prange V. Hepp B. Jost Ll. Garrido Alberto Messineo R. W. L. Jones Lester D.r. Thompson Jf Renardy D. Kuhn Kyle Cranmer V. Lemaitre S. Brandt O.j. Hayes R. Settles A. Ealet J. B. De Vivie De Regie A. Antonelli O. Callot G. Boix

subject

Nuclear and High Energy Physics Particle physics Photon Electron–positron annihilation 01 natural sciences Standard Model Luminosity Nuclear physics Chargino atomic particle 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physics Physics energy transfer article; atomic particle; energy; energy transfer; luminance; mass luminance 010308 nuclear & particles physics High Energy Physics::Phenomenology Degenerate energy levels article Supersymmetry Neutralino mass High Energy Physics::Experiment Particle Physics - Experiment energy

description

A search for charginos nearly mass degenerate with the lightest neutralino is performed with the data collected by the ALEPH detector at LEP, at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 628 pb-1. The analysis is based on the detection of isolated and energetic initial state radiation photons, produced in association with chargino pairs whose decay products have little visible energy. The number of candidate events observed is in agreement with that expected from Standard Model background sources. These results are combined with those of other direct searches for charginos, and a lower limit of 88 GeV/c2 at 95 % confidence level is derived for the chargino mass in the case of heavy sfermions, irrespective of the chargino-neutralino mass difference. A search for charginos nearly mass degenerate with the lightest neutralino is performed with the data collected by the ALEPH detector at LEP, at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 628 pb −1 . The analysis is based on the detection of isolated and energetic initial state radiation photons, produced in association with chargino pairs whose decay products have little visible energy. The number of candidate events observed is in agreement with that expected from Standard Model background sources. These results are combined with those of other direct searches for charginos, and a lower limit of 88 GeV/ c 2 at 95% confidence level is derived for the chargino mass in the case of heavy sfermions, irrespective of the chargino-neutralino mass difference. A search for charginos nearly mass degenerate with the lightest neutralino is performed with the data collected by the ALEPH detector at LEP, at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 628 pb-1. The analysis is based on the detection of isolated and energetic initial state radiation photons, produced in association with chargino pairs whose decay products have little visible energy. The number of candidate events observed is in agreement with that expected from Standard Model background sources. These results are combined with those of other direct searches for charginos, and a lower limit of 88 GeV/c2 at 95 % confidence level is derived for the chargino mass in the case of heavy sfermions, irrespective of the chargino-neutralino mass difference.

year	journal	country	edition	language
2002-01-01	Physics Letters B

https://doi.org/10.1016/s0370-2693(02)01584-8