Search for a new weakly interacting particle

6533b7dcfe1ef96bd12716ac

RESEARCH PRODUCT

Search for a new weakly interacting particle

D. Decamp B. Deschizeaux C. Goy J.-p. Lees M.-n. Minard R. Alemany J.m. Crespo M. Delfino E. Fernandez V. Gaitan Ll. Garrido P. Mato Mir Ll.m.A. Pacheco M.g. Catanesi D. Creanza M. De Palma A. Farilla G. Iaselli G. Maggi M. Maggi S. Natali S. Nuzzo M. Quattromini A. Ranieri G. Raso F. Romano F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta G. Zito Y. Gao H. Hu D. Huang X. Huang J. Lin J. Lou C. Qiao T. Ruan T. Wang Y. Xie D. Xu R. Xu J. Zhang W. Zhao W.b. Atwood F. Bird E. Blucher G. Bonvicini F. Bossi D. Brown T.h. Burnett H. Drevermann F. Dydak R.w. Forty C. Grab R. Hagelberg S. Haywood J. Hilgart B. Jost M. Kasemann J. Knobloch A. Lacourt E. Lançon I. Lehraus T. Lohse A. Marchioro M. Martinez S. Menary A. Minten A. Miotto R. Miguel H.-g. Moser J. Nash P. Palazzi F. Ranjard G. Redlinger A. Roth J. Rothberg H. Rotscheidt R. St. Denis D. Schlatter M. Takashima M. Talby W. Tejessy H. Wachsmuth S. Wasserbaech S. Wheeler W. Wiedenmann W. Witzeling J. Wotschack Z. Ajaltouni M. Bardadin-otwinowska A. Falvard R. El Fellous P. Gay J. Harvey P. Henrard J. Jousset B. Michel J.-c. Montret D. Pallin P. Perret J. Proriol F. Prulhière G. Stimpfl J.d. Hansen J.r. Hansen P.h. Hansen R. Møllerud E.r. Nielsen B.s. Nilsson I. Efthymiopoulos E. Simopoulou A. Vayaki J. Badier A. Blondel G. Bonneaud J. Bourotte F. Braems J.c. Brient G. Fouque A. Gamess R. Guirlet S. Orteu A. Rosowsky A. Rougé M. Rumpf R. Tanaka H. Videau D.j. Candlin E. Veitch G. Parrini M. Corden C. Georgiopoulos M. Ikeda J. Lannutti D. Levinthal M. Mermikides L. Sawyer A. Antonelli R. Baldini G. Bencivenni G. Bologna P. Campana G. Capon V. Chiarella B. D'ettorre-piazzoli G. Felici P. Laurelli G. Mannocchi F. Murtas G.p. Murtas G. Nicoletti L. Passalacqua M. Pepe-altarelli P. Picchi P. Zografou B. Altoon O. Boyle A.w. Halley I. Ten Have J.l. Hearns J.g. Lynch W.t. Morton C. Raine J.m. Scarr K. Smith A.s. Thompson R.m. Turnbull B. Brandl O. Braun R. Geiges C. Geweniger P. Hanke V. Hepp E.e. Kluge Y. Maumary A. Putzer B. Rensch A. Stahl K. Tittel M. Wunsch A.t. Belk R. Beuselinck D.m. Binnie W. Cameron M. Cattaneo P.j. Dornan S. Dugeay A.m. Greene J.f. Hassard N.m. Lieske S.j. Patton D.g. Payne M.j. Phillips J.k. Sedgbeer G. Taylor I.r. Tomalin A.g. Wright P. Girtler D. Kuhn G. Rudolph C.k. Bowdery T.j. Brodbeck A.j. Finch F. Foster G. Hughes N.r. Keemer M. Nuttall A. Patel B.s. Rowlingson T. Sloan S.w. Snow E.p. Whelan T. Barczewski L.a.t. Bauerdick K. Kleinknecht B. Renk S. Roehn H.-g. Sander M. Schmelling H. Schmidt F. Steeg J.-p. Albanese J.-j. Aubert C. Benchouk V. Bernard A. Bonissent D. Courvoisier F. Etienne S. Papalexiou P. Payre B. Pietrzyk Z. Qian H. Becker W. Blum P. Cattaneo G. Cowan B. Dehning H. Dietl M. Fernandez-bosman T. Hansl-kozanecka A. Jahn W. Kozanecki E. Lange J. Lauber G. Lütjens G. Lutz W. Männer Y. Pan R. Richter J. Schröder A.s. Schwarz R. Settles U. Stierlin J. Thomas G. Wolf V. Bertin J. Boucrot O. Callot X. Chen A. Cordier M. Davier G. Ganis J.-f. Grivaz Ph. Heusse P. Janot D.w. Kim F. Le Diberder J. Lefrançois A.-m. Lutz J.-j. Veillet I. Videau Z. Zhang F. Zomer S.r. Amendolia G. Bagliesi G. Batignani L. Bosisio U. Bottigli C. Bradaschia M. Carpinelli M.a. Ciocci R. Dell'orso I. Ferrante F. Fidecaro L. Foà E. Focardi F. Forti A. Giassi M.a. Giorgi F. Ligabue A. Lusiani E.b. Mannelli P.s. Marrocchesi A. Messineo L. Moneta F. Palla G. Sanguinetti J. Steinberger R. Tenchini G. Tonelli G. Triggiani C. Vannini A. Venturi P.g. Verdini J. Walsh J.m. Carter M.g. Green P.v. March T. Medcalf I.s. Quazi M.r. Saich J.a. Strong R.m. Thomas L.r. West T. Wildish D.r. Botterill R.w. Clifft T.r. Edgecock M. Edwards S.m. Fisher T.j. Jones P.r. Norton D.p. Salmon J.c. Thompson B. Bloch-devaux P. Colas C. Klopfenstein E. Locci S. Loucatos E. Monnier P. Perez J.a. Perlas F. Perrier J. Rander J.-f. Renardy A. Roussarie J.-p. Schuller J. Schwindling B. Vallage J.g. Ashman C.n. Booth C. Buttar R. Carney S. Cartwright F. Combley M. Dinsdale M. Dogru F. Hatfield J. Martin D. Parker P. Reeves L.f. Thompson S. Brandt H. Burkhardt C. Grupen H. Meinhard L. Mirabito E. Neugebauer U. Schäfer H. Seywerd G. Apollinari G. Giannini B. Gobbo F. Liello F. Ragusa L. Rolandi U. Stiegler L. Bellantoni J.f. Boudreau D. Cinabro J.s. Conway D.f. Cowen A.j. Deweerd Z. Feng D.p.s. Ferguson Y.s. Gao J. Grahl J.l. Harton J.e. Jacobsen R.c. Jared R.p. Johnson B.w. Leclaire Y.b. Pan J.r. Pater Y. Saadi V. Sharma A.m. Walsh J.a. Wear F.v. Weber M.h. Whitney Null Sau Lan Wu Z.l. Zhou G. Zobernig

subject

Physics Nuclear physics Nuclear and High Energy Physics Aleph Particle physics Gauge boson Isospin Electron–positron annihilation High Energy Physics::Phenomenology Higgs boson High Energy Physics::Experiment Particle Physics - Experiment Lepton

description

Abstract A search for events of the type e + e − →l + l − X 0 , where X 0 can be any weakly interacting particle which couples to the Z, has been performed with the ALEPH detector at LEP, by searching for acollinear lepton pairs. Such particles can be excluded up to a mass of 7.0 GeV/c 2 for a value of the ratio of branching fractions, Br( Z →X 0 l + l − )/Br(Z→ l + l − ), greater than 2.5 × 10 −3 if the X 0 has third component of isospin, I 3 greater than 1 2 and decays to a pair of virtual gauge bosons. When this analysis is combined with the previous results of the Higgs particle searches from ALEPH, this limit can be extended to an X 0 mass of 60 GeV/c 2 .

year	journal	country	edition	language
1991-01-01

10.1016/0370-2693(91)90657-c http://hdl.handle.net/11588/509975