Flores Chalco, Soraya I.

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Estudio de la masa invariante de las partíulas j/ψ y z en la actualización del experimento cms
(2013) Flores Chalco, Soraya I.; Méndez Mella, Héctor; College of Arts and Science - Science; López Berrios, Ángel Colón; Santana Colón, Samuel; Department of Physics; Diáz Rivera, Rubén E.
The purpose of this work is to examine muon reconstruction in the Phase 1 of upgrade of CMS (Compact Muon Solenoid) the detector and compare it to the current geometry at the SLHC (Super Large Hadron Collider) environment.In order to contrast both geometries, it was needed to reconstruct μ+μ− resonance and identify the signal of J/ψ meson and Z boson, to then, proceed to divide into the sample segments of pseudo-rapidity (η) and muons transverse momentum (pT ) to plot the invariant mass as a function of η and pT , respectively. The shape of these histograms is fitted with Gaussian functions from which are extracted relevant parameters as the mass, the standard deviation and the eficiency, in order to do the comparison between the two geometries. From these results we concluded that the average value of the mass of the particles is closer to the nominal value of the mass described in the PDG (Particle Data Group) for the J/ψ meson and the Z boson in both geometries. With the update on the Phase 1 of the CMS, the total number of events detected increased compared to the current the SLHC geometry for the J/ψ meson and the Z boson.