Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb−1. No evidence for the production of such particles is found in the decay channels , , , or in the stop four-body decay channel studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios.

Search for scalar quarks in e+e− collisions at up to 209 GeV / A Heister;S Schael;R Barate;R Brunelière;I De Bonis;D Decamp;C Goy;S Jezequel;J.-P Lees;F Martin;E Merle;M.-N Minard;B Pietrzyk;B Trocmé;G Boix;S Bravo;M.P Casado;M Chmeissani;J.M Crespo;E Fernandez;M Fernandez-Bosman;Ll Garrido;E Graugés;J Lopez;M Martinez;G Merino;R Miquel;Ll.M Mir;A Pacheco;D Paneque;H Ruiz;A Colaleo;D Creanza;N De Filippis;M de Palma;G Iaselli;G Maggi;M Maggi;S Nuzzo;A Ranieri;G Raso;F Ruggieri;G Selvaggi;L Silvestris;P Tempesta;A Tricomi;G Zito;X Huang;J Lin;Q Ouyang;T Wang;Y Xie;R Xu;S Xue;J Zhang;L Zhang;W Zhao;D Abbaneo;P Azzurri;T Barklow;O Buchmüller;M Cattaneo;F Cerutti;B Clerbaux;H Drevermann;R.W Forty;M Frank;F Gianotti;T.C Greening;J.B Hansen;J Harvey;D.E Hutchcroft;P Janot;B Jost;M Kado;P Mato;A Moutoussi;F Ranjard;L Rolandi;D Schlatter;G Sguazzoni;W Tejessy;F Teubert;A Valassi;I Videau;J.J Ward;F Badaud;S Dessagne;A Falvard;D Fayolle;P Gay;J Jousset;B Michel;S Monteil;D Pallin;J.M Pascolo;P Perret;J.D Hansen;J.R Hansen;P.H Hansen;B.S Nilsson;A Kyriakis;C Markou;E Simopoulou;A Vayaki;K Zachariadou;A Blondel;J.-C Brient;F Machefert;A Rougé;M Swynghedauw;R Tanaka;H Videau;V Ciulli;E Focardi;G Parrini;A Antonelli;M Antonelli;G Bencivenni;F Bossi;G Capon;V Chiarella;P Laurelli;G Mannocchi;G.P Murtas;L Passalacqua;J Kennedy;J.G Lynch;P Negus;V O'Shea;A.S Thompson;S Wasserbaech;R Cavanaugh;S Dhamotharan;C Geweniger;P Hanke;V Hepp;E.E Kluge;G Leibenguth;A Putzer;H Stenzel;K Tittel;M Wunsch;R Beuselinck;W Cameron;G Davies;P.J Dornan;M Girone;R.D Hill;N Marinelli;J Nowell;S.A Rutherford;J.K Sedgbeer;J.C Thompson;R White;V.M Ghete;P Girtler;E Kneringer;D Kuhn;G Rudolph;E Bouhova-Thacker;C.K Bowdery;D.P Clarke;G Ellis;A.J Finch;F Foster;G Hughes;R.W.L Jones;M.R Pearson;N.A Robertson;M Smizanska;O van der Aa;C Delaere;V Lemaitre;U Blumenschein;F Hölldorfer;K Jakobs;F Kayser;K Kleinknecht;A.-S Müller;G Quast;B Renk;H.-G Sander;S Schmeling;H Wachsmuth;C Zeitnitz;T Ziegler;A Bonissent;P Coyle;C Curtil;A Ealet;D Fouchez;P Payre;A Tilquin;F Ragusa;A David;H Dietl;G Ganis;K Hüttmann;G Lütjens;W Männer;H.-G Moser;R Settles;G Wolf;J Boucrot;O Callot;M Davier;L Duflot;J.-F Grivaz;Ph Heusse;A Jacholkowska;C Loomis;L Serin;J.-J Veillet;J.-B de Vivie de Régie;C Yuan;G Bagliesi;T Boccali;L Foà;A Giammanco;A Giassi;F Ligabue;A Messineo;F Palla;G Sanguinetti;A Sciabà;R Tenchini;A Venturi;P.G Verdini;O Awunor;G.A Blair;G Cowan;A Garcia-Bellido;M.G Green;L.T Jones;T Medcalf;A Misiejuk;J.A Strong;P Teixeira-Dias;R.W Clifft;T.R Edgecock;P.R Norton;I.R Tomalin;B Bloch-Devaux;D Boumediene;P Colas;B Fabbro;E Lançon;M.-C Lemaire;E Locci;P Perez;J Rander;B Tuchming;B Vallage;N Konstantinidis;A.M Litke;G Taylor;C.N Booth;S Cartwright;F Combley;P.N Hodgson;M Lehto;L.F Thompson;K Affholderbach;A Böhrer;S Brandt;C Grupen;J Hess;A Ngac;G Prange;U Sieler;C Borean;G Giannini;H He;J Putz;J Rothberg;S.R Armstrong;K Berkelman;K Cranmer;D.P.S Ferguson;Y Gao;S González;O.J Hayes;H Hu;S Jin;J Kile;P.A McNamara;J Nielsen;Y.B Pan;J.H von Wimmersperg-Toeller;W Wiedenmann;J Wu;Sau Lan Wu;X Wu;G Zobernig;G Dissertori. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 537:(2002), pp. 5-20. [10.1016/S0370-2693(02)01827-0]

Search for scalar quarks in e+e− collisions at up to 209 GeV

FOCARDI, ETTORE;CIULLI, VITALIANO;
2002

Abstract

Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb−1. No evidence for the production of such particles is found in the decay channels , , , or in the stop four-body decay channel studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios.
2002
537
5
20
A Heister;S Schael;R Barate;R Brunelière;I De Bonis;D Decamp;C Goy;S Jezequel;J.-P Lees;F Martin;E Merle;M.-N Minard;B Pietrzyk;B Trocmé;G Boix;S Bravo;M.P Casado;M Chmeissani;J.M Crespo;E Fernandez;M Fernandez-Bosman;Ll Garrido;E Graugés;J Lopez;M Martinez;G Merino;R Miquel;Ll.M Mir;A Pacheco;D Paneque;H Ruiz;A Colaleo;D Creanza;N De Filippis;M de Palma;G Iaselli;G Maggi;M Maggi;S Nuzzo;A Ranieri;G Raso;F Ruggieri;G Selvaggi;L Silvestris;P Tempesta;A Tricomi;G Zito;X Huang;J Lin;Q Ouyang;T Wang;Y Xie;R Xu;S Xue;J Zhang;L Zhang;W Zhao;D Abbaneo;P Azzurri;T Barklow;O Buchmüller;M Cattaneo;F Cerutti;B Clerbaux;H Drevermann;R.W Forty;M Frank;F Gianotti;T.C Greening;J.B Hansen;J Harvey;D.E Hutchcroft;P Janot;B Jost;M Kado;P Mato;A Moutoussi;F Ranjard;L Rolandi;D Schlatter;G Sguazzoni;W Tejessy;F Teubert;A Valassi;I Videau;J.J Ward;F Badaud;S Dessagne;A Falvard;D Fayolle;P Gay;J Jousset;B Michel;S Monteil;D Pallin;J.M Pascolo;P Perret;J.D Hansen;J.R Hansen;P.H Hansen;B.S Nilsson;A Kyriakis;C Markou;E Simopoulou;A Vayaki;K Zachariadou;A Blondel;J.-C Brient;F Machefert;A Rougé;M Swynghedauw;R Tanaka;H Videau;V Ciulli;E Focardi;G Parrini;A Antonelli;M Antonelli;G Bencivenni;F Bossi;G Capon;V Chiarella;P Laurelli;G Mannocchi;G.P Murtas;L Passalacqua;J Kennedy;J.G Lynch;P Negus;V O'Shea;A.S Thompson;S Wasserbaech;R Cavanaugh;S Dhamotharan;C Geweniger;P Hanke;V Hepp;E.E Kluge;G Leibenguth;A Putzer;H Stenzel;K Tittel;M Wunsch;R Beuselinck;W Cameron;G Davies;P.J Dornan;M Girone;R.D Hill;N Marinelli;J Nowell;S.A Rutherford;J.K Sedgbeer;J.C Thompson;R White;V.M Ghete;P Girtler;E Kneringer;D Kuhn;G Rudolph;E Bouhova-Thacker;C.K Bowdery;D.P Clarke;G Ellis;A.J Finch;F Foster;G Hughes;R.W.L Jones;M.R Pearson;N.A Robertson;M Smizanska;O van der Aa;C Delaere;V Lemaitre;U Blumenschein;F Hölldorfer;K Jakobs;F Kayser;K Kleinknecht;A.-S Müller;G Quast;B Renk;H.-G Sander;S Schmeling;H Wachsmuth;C Zeitnitz;T Ziegler;A Bonissent;P Coyle;C Curtil;A Ealet;D Fouchez;P Payre;A Tilquin;F Ragusa;A David;H Dietl;G Ganis;K Hüttmann;G Lütjens;W Männer;H.-G Moser;R Settles;G Wolf;J Boucrot;O Callot;M Davier;L Duflot;J.-F Grivaz;Ph Heusse;A Jacholkowska;C Loomis;L Serin;J.-J Veillet;J.-B de Vivie de Régie;C Yuan;G Bagliesi;T Boccali;L Foà;A Giammanco;A Giassi;F Ligabue;A Messineo;F Palla;G Sanguinetti;A Sciabà;R Tenchini;A Venturi;P.G Verdini;O Awunor;G.A Blair;G Cowan;A Garcia-Bellido;M.G Green;L.T Jones;T Medcalf;A Misiejuk;J.A Strong;P Teixeira-Dias;R.W Clifft;T.R Edgecock;P.R Norton;I.R Tomalin;B Bloch-Devaux;D Boumediene;P Colas;B Fabbro;E Lançon;M.-C Lemaire;E Locci;P Perez;J Rander;B Tuchming;B Vallage;N Konstantinidis;A.M Litke;G Taylor;C.N Booth;S Cartwright;F Combley;P.N Hodgson;M Lehto;L.F Thompson;K Affholderbach;A Böhrer;S Brandt;C Grupen;J Hess;A Ngac;G Prange;U Sieler;C Borean;G Giannini;H He;J Putz;J Rothberg;S.R Armstrong;K Berkelman;K Cranmer;D.P.S Ferguson;Y Gao;S González;O.J Hayes;H Hu;S Jin;J Kile;P.A McNamara;J Nielsen;Y.B Pan;J.H von Wimmersperg-Toeller;W Wiedenmann;J Wu;Sau Lan Wu;X Wu;G Zobernig;G Dissertori
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/658514
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