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| Título: | Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in pp̅ Collisions at √s=1.96 TeV |
Autor: | Aaltonen, T.; Álvarez González, B.; Casal, Bruno CSIC; Cuevas, Javier CSIC ORCID; Gómez, Gervasio CSIC ORCID ; Palencia, Enrique CSIC ORCID; Rodrigo, Teresa CSIC ORCID ; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar Cortabitarte, R. CSIC ORCID; Vizán, J. CSIC ORCID | Fecha de publicación: | may-2011 | Editor: | American Physical Society | Citación: | Physical Review Letters 106(19): 191801 (2010) | Resumen: | We present a search for a new particle T′ decaying to top quark via T′→t+X, where X is an invisible particle. In a data sample with 4.8 fb-1 of integrated luminosity collected by the CDF II detector at Fermilab in pp̅ collisions with √s=1.96 TeV, we search for pair production of T′ in the lepton+jets channel, pp̅ →tt̅ +X+X→ℓνbqq′b+X+X. We interpret our results primarily in terms of a model where T′ are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600 GeV/c2, the dark matter particle mass being anywhere below mT′. The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T′T̅ ′→tt̅ +X+X. For the dark matter model we exclude T′ at 95% confidence level up to mT′=360 GeV/c2 for mX≤100 GeV/c2. | Descripción: | 7 páginas, 3 figuras, 2 tablas.-- PACS numbers: 14.65.Jk, 12.60.-i, 13.85.Rm, 14.80.-j,-- CDF Collaboration: et al. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.106.191801 | URI: | http://hdl.handle.net/10261/46632 | DOI: | 10.1103/PhysRevLett.106.191801 | ISSN: | 0031-9007 | E-ISSN: | 1079-7114 |
| Aparece en las colecciones: | (IFCA) Artículos |
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| Fichero | Descripción | Tamaño | Formato | |
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| e191801.pdf | 239,22 kB | Adobe PDF |  Visualizar/Abrir |
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