Publication:
Study of the Ξ_(b)^(-) baryon decay at cms
Study of the Ξ_(b)^(-) baryon decay at cms
dc.contributor.advisor | Ramírez-Vargas, Juan E. | |
dc.contributor.author | Santiesteban, Sandra N. | |
dc.contributor.college | College of Arts and Science - Science | en_US |
dc.contributor.committee | Santana-Colón, Samuel A. | |
dc.contributor.committee | Méndez-Mella, Héctor | |
dc.contributor.department | Department of Physics | en_US |
dc.contributor.representative | Ortíz, Juan A. | |
dc.date.accessioned | 2019-04-15T17:19:18Z | |
dc.date.available | 2019-04-15T17:19:18Z | |
dc.date.issued | 2014 | |
dc.description.abstract | A preliminary measurement of the Ξ _(b)^(-) baryon lifetime through the decay chain Ξ _(b)^(-) → J/ψΞ−, where J/ψ → μ+μ−, Ξ− → Λ0π− and Λ0 → pπ−, using 5.1 fb−1 of integrated luminosity of data from proton-proton collisions with a center-of-mass energy of 7 TeV collected by the Compact Muon Solenoid CMS at CERN is presented. After the reconstruction and selection of the Ξ _(b)^(-) baryon from the data, 65 candidates with a mass of 5.798 ± 0.015 GeV /c2 were found. Then, the reduced proper time of the Ξ _(b)^(-) candidates were calculated in order to use the binned maximum likelihood method to measure the lifetime of the particle. Finally, the preliminary lifetime τ = 1.597 ±_(0.262)^(±0.293) ±0.060 ps was measured, where the first error is statistical and the second is systematic. | en_US |
dc.description.abstract | Esta tesis presenta una medida preliminar del tiempo de vida del barión Ξ _(b)^(-) a través del canal de decaimiento Ξ _(b)^(-) → J/ψΞ−, donde J/ψ → μ+μ−, Ξ− → Λ0π− y Λ0 → pπ−, con 5.1 f b−1 de luminosidad integrada y centro de masa de 7 T eV , de datos provenientes de colisiones protón-protón en el Solenoide Compacto de Muones CMS en CERN. Después de la reconstrucción y selección de los bariones Ξ _(b)^(-) de la muestra de datos, se encontraron 65 candidatos con una masa de 5.798±0.015 GeV/c2. Posteriormente, se calculó el tiempo propio reducido de los candidatos a Ξ _(b)^(-) con el fin de utilizar el método de máxima probabilidad para medir el tiempo de vida de la partícula. Finalmente, el tiempo de vida preliminar τ = 1.597 ±_(0.262)^(±0.293) ±0.060 ps fue medido, en donde el primer error es estadístico y el segundo es sistemático. | en_US |
dc.description.graduationSemester | Spring (2nd semester) | en_US |
dc.description.graduationYear | 2014 | en_US |
dc.description.sponsorship | CMS project | en_US |
dc.identifier.uri | https://hdl.handle.net/20.500.11801/2023 | |
dc.language.iso | English | en_US |
dc.rights.holder | (c) 2014 Sandra Nathaly Santiesteban | en_US |
dc.rights.license | All rights reserved | en_US |
dc.title | Study of the Ξ_(b)^(-) baryon decay at cms | en_US |
dc.type | Thesis | en_US |
dspace.entity.type | Publication | |
thesis.degree.discipline | Physics | en_US |
thesis.degree.level | M.S. | en_US |
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