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dc.contributor.advisorRamírez-Vargas, Juan E.
dc.contributor.authorSantiesteban, Sandra N.
dc.description.abstractA 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.abstractEsta 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.sponsorshipCMS projecten_US
dc.titleStudy of the Ξ_(b)^(-) baryon decay at cmsen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2014 Sandra Nathaly Santiestebanen_US
dc.contributor.committeeSantana-Colón, Samuel A.
dc.contributor.committeeMéndez-Mella, Héctor
dc.contributor.representativeOrtíz, Juan A.
dc.contributor.collegeCollege of Arts and Science - Scienceen_US
dc.contributor.departmentDepartment of Physicsen_US
dc.description.graduationSemesterSpring (2nd semester)en_US

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