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dc.contributor.advisorMéndez-Mella, Héctor
dc.contributor.authorMalca-Reyes, Carlos Alberto
dc.description.abstractThis thesis present the measurement of the mass of the B+ meson produced in pp colli- sions at a centre-of-mass energy of √s = 7 TeV . The data correspond to an integrated luminosity of 5.05 fb−1 collected by the CMS experiment operating at the LHC. The exclusive decay for this study is B+ → J/ΨK+, where J/Ψ meson is reconstructed via the decay mode J/Ψ → μ+μ−. Certain consideration are evaluated to obtain an acceptable measurement, such as suppress some decays, for example one track appears not reconstructed (B0 → J/ΨK+π−). In this work, we find: M_(B+→J/ΨK+)^(rec) = 5278.4 ± 0.116 MeV/c2 where the mass difference with the PDG mass, is the small value of: M_(B+)^(rec) − MPDG _(B+)^(rec) =0.85±0.28MeV/c2en_US
dc.description.abstractEsta tesis presenta la medida de la masa del mesón B+ producido en colisiones pp a una energía del centro de masa de √s = 7 TeV. Los datos corresponden a una luminosidad integrada de 5.05 fb−1 recolectada por el experimento CMS del LHC. El decaimiento exclusivo del presente estudio es B+ → J/ΨK+, donde el mesón J/Ψ es reconstruido en el modo de decaimiento J/Ψ → μ+μ−. Para obtener una buena medida se evaluan algunas consideraciones que nos permitiran suprimir ciertos decaimiento como por ejemplo una de las trazas no aparesca reconstruida (B0 → J/ΨK+π−). A partir de estos resultados, la masa medida en nuestro estudio es: M_(B+→J/ΨK+)^(rec) = 5278.4 ± 0.116 MeV/c2 y comparada con la masa promedio extraida del PDG (“Particle Data Group”) que es 5279.25 ± 0.26 M eV /c2 obtenemos una diferencia pequeña de: M_(B+)^(rec) − MPDG _(B+)^(rec) =0.85±0.28MeV/c2en_US
dc.titleMedición de la masa del mesón B+ en el detector CMSen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2014 Carlos Alberto Malca-Reyesen_US
dc.contributor.committeeRamírez-Vargas, Juan Eduardo
dc.contributor.committeeSantana-Colon, Samuel
dc.contributor.representativeCortés-Figueroa, José E.
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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