Search for heavy bottomlike quarks decaying to an electron or muon and jets in pp̅ collisions at √s=1.96  TeV

We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b′) each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse mom...

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Detalles Bibliográficos
Autores: Aaltonen, Timo Antero, Álvarez González, Bárbara, Casal Laraña, Bruno, Cuevas Maestro, Francisco Javier, Gómez Gramuglio, Gervasio|||0000-0002-1077-6553, Palencia Cortezón, José Enrique, Rodrigo Anoro, Teresa, Ruiz Jimeno, Alberto|||0000-0002-3639-0368, Scodellaro, Luca|||0000-0002-4974-8330, Vila Álvarez, Iván |||0000-0002-6797-7209, Vilar Cortabitarte, Rocío|||0000-0003-2045-8054, Vizán García, Jesús Manuel|||0000-0002-6823-8854
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/1942
Acceso en línea:http://hdl.handle.net/10902/1942
Access Level:acceso abierto
Descripción
Sumario:We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b′) each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from p¯p collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8 fb−1. We observe events consistent with background expectation, calculate upper limits on the b′ pair-production cross section (σb¯ b′≲30fb for mb′>375 GeV/c2), and exclude mb′<372 GeV/c2 at 95% confidence level assuming a 100% branching ratio of b′ to tW. .

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