Measurements of differential tt production cross sections are presented in the single-lepton decay channel, as a function of a number of kinematic event variables. The measurements are performed with proton-proton collision data at √ s = 13 TeV, collected by the CMS experiment at the LHC during 2016, with an integrated luminosity of 35.9 fb −1 . The data are compared to a variety of state-of-the-art leading-order and next-to-leadingorder tt simulations. A Tabulated normalized differential tt production cross sections 25 B Tabulated absolute differential tt production cross sections 29 C Tabulated minimum and maximum relative uncertainties for absolute cross sections 32The CMS collaboration 38 IntroductionIn 2016 the CERN LHC collided protons at √ s = 13 TeV, resulting in a data set recorded by the CMS experiment [1], with an integrated luminosity of 35.9 fb −1 . Approximately 30 million top quark-antiquark pairs (tt) are present in this data set, which allows detailed studies of the production properties of tt events to be performed.Measurements of kinematic distributions in tt events are important for verifying current theoretical models of tt production and decay. As tt production and top quark decay can be a significant source of background events in many searches for physics beyond the standard model, for example in searches for supersymmetric models with top-quark-like signatures, it is important that tt production be well understood and modeled. In addition to physics beyond the standard model, a good understanding of tt production is necessary -1 - JHEP06(2018)002for measurements of rare standard model processes, such as tt production in association with a W, Z, or Higgs boson.In this paper, we present measurements of differential tt production cross sections, as a function of kinematic event variables that do not require the reconstruction of the tt system. Events are considered when the final state includes exactly one isolated lepton ( = e or µ) with large transverse momentum p T and at least four jets, of which at least two are tagged as originating from a bottom (b) quark. The kinematic event variables are the jet multiplicity (N jets ), the scalar sum of the jet p T (H T ), the scalar sum of the p T of all particles (S T ), the transverse momentum imbalance (p miss T ), the magnitude of the p T of the leptonically decaying W boson (p W T ), and the magnitudes of the p T and pseudorapidity of the lepton (p T and |η |).The measurements of the differential tt production cross sections are presented at particle level, i.e. with respect to generated "stable" particles (with a mean lifetime longer than 30 ps), in a phase space that closely resembles that accessible by the CMS detector (the visible phase space). This avoids the influence of large theoretical uncertainties that would be introduced by extrapolating the measurements to a larger phase space, or by presenting the measurements at parton level.Several measurements of the differential tt production cross sections as a function of the pro...
Este estudio se enfoca en analizar la percepción que presentan los clientes, en un proceso de servicio brindado por una organización objeto de estudio. Considerando que una percepción positiva brinda mejores resultados y crea lealtad, convirtiéndose en una estrategia que genera una ventaja competitiva. Ser capaz de proporcionar un servicio de calidad no solo es la entrega del producto, sino toda la experiencia brindada desde las condiciones del establecimiento hasta la capacidad de atención de los empleados. Los restaurantes Ángelus de la franquicia Tutto Freddo fueron el objeto de estudio por la gran variedad y diversidad de su segmento de mercado. Se aplicó el método SERVQUAL con un proceso de validación de atributos y se analizó la calidad del servicio con la aplicación de encuestas validadas a una muestra representativa. El caso expone un análisis a diez atributos, tres de ellos presentaron un margen de brechas considerable, como la rapidez en el servicio, comunicación y proporción producto/precio; las actividades de mejora deben imponer un mayor enfoque en estos atributos para una mejor valoración del cliente.
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