The results of a search for pair production of light top squarks are presented, using 4.7 fb(-1) of root s = 7 TeV proton-proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e, mu), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large t (t) over bar background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123-167 GeV are excluded for neutralino masses around 55 GeV.
Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in proton–proton collisions / G. Aad;T. Abajyan;B. Abbott;J. Abdallah;S. Abdel Khalek;A.A. Abdelalim;O. Abdinov;R. Aben;B. Abi;M. Abolins;O.S. AbouZeid;H. Abramowicz;H. Abreu;E. Acerbi;B.S. Acharya;L. Adamczyk;D.L. Adams;T.N. Addy;J. Adelman;S. Adomeit;P. Adragna;T. Adye;S. Aefsky;J.A. Aguilar-Saavedra;M. Agustoni;M. Aharrouche;S.P. Ahlen;F. Ahles;A. Ahmad;M. Ahsan;G. Aielli;T. Akdogan;T.P.A. Åkesson;G. Akimoto;A.V. Akimov;M.S. Alam;M.A. Alam;J. Albert;S. Albrand;M. Aleksa;I.N. Aleksandrov;F. Alessandria;C. Alexa;G. Alexander;G. Alexandre;T. Alexopoulos;M. Alhroob;M. Aliev;G. Alimonti;J. Alison;B.M.M. Allbrooke;P.P. Allport;S.E. Allwood-Spiers;J. Almond;A. Aloisio;R. Alon;A. Alonso;F. Alonso;B. Alvarez Gonzalez;M.G. Alviggi;K. Amako;C. Amelung;V.V. Ammosov;S.P. Amor Dos Santos;A. Amorim;N. Amram;C. Anastopoulos;L.S. Ancu;N. Andari;T. Andeen;C.F. Anders;G. Anders;K.J. Anderson;A. 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Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in proton–proton collisions
BELLAGAMBA, LORENZO;BERTIN, ANTONIO;BOSCHERINI, DAVIDE;BRUNI, ALESSIA;BRUNI, GRAZIANO;CAFORIO, DAVIDE;DE CASTRO, STEFANO;DI SIPIO, RICCARDO;FABBRI, LAURA;FRANCHINI, MATTEO;GIACOBBE, BENEDETTO;MASSA, IGNAZIO GIACOMO;MENGARELLI, ALBERTO;MONZANI, SIMONE;PICCININI, MAURIZIO;RINALDI, LORENZO;ROMANO, MARINO;SBARRA, CARLA;SBRIZZI, ANTONIO;SEMPRINI CESARI, NICOLA;SPIGHI, ROBERTO;VALENTINETTI, SARA;VILLA, MAURO;I. Vivarelli;ZOCCOLI, ANTONIO;
2013
Abstract
The results of a search for pair production of light top squarks are presented, using 4.7 fb(-1) of root s = 7 TeV proton-proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e, mu), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large t (t) over bar background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123-167 GeV are excluded for neutralino masses around 55 GeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.