Universidad Iberoamericana Ciudad de México

About: Universidad Iberoamericana Ciudad de México is a education organization based out in Mexico City, Mexico. It is known for research contribution in the topics: Large Hadron Collider & Standard Model. The organization has 2259 authors who have published 3981 publications receiving 109298 citations.

Search for anomalous triple gauge couplings in WW and WZ production in lepton + jet events in proton-proton collisions at s√ = 13 TeV

Abstract: A search is presented for three additional operators that would lead to anomalous WWγ or WWZ couplings with respect to those in the standard model. They are constrained by studying events with two vector bosons, a W boson decaying to eν or μν, and a W or Z boson decaying hadronically, reconstructed as a single, massive, large- radius jet. The search uses a data set of proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 35.9 fb$^{−1}$. Using the reconstructed diboson invariant mass, 95% confidence intervals are obtained for the anomalous coupling parameters of −1.58 < $c_{WWW}$/Λ$^{2}$< 1.59 TeV$^{−2}$, −2.00 < c$_{W}$/Λ$^{2}$< 2.65 TeV$^{−2}$, and −8.78 < c$_{B}$/Λ$^{2}$< 8.54 TeV$^{−2}$, in agreement with standard model expectations of zero for each parameter. These are the strictest bounds on these parameters to date.

Autopoiesis, la unidad de una diferencia: Luhmann y Maturana

Abstract: El articulo ofrece una resena de la fructifera relacion teorica entre Niklas Luhmann y Humberto Maturana. La teoria luhmanniana es un edificio conceptual cuyas dimensiones abarcan la comprension de todo lo social. Pese al fallecimiento del autor en 1998, todavia hoy se continuan publicando escritos postumos y la influencia de su pensamiento se extiende paulatinamente a diversos ambitos de las ciencias sociales. Parte central de este complejo pensamiento se desarrolla con la ayuda de conceptos que Luhmann adapto de la biologia de Humberto Maturana. En este trabajo se explica el modo de esta vinculacion y los alcances que tiene para la comprension de la sociedad globalizada moderna.

Measurements of the ZZ production cross sections in the 2l2ν channel in proton–proton collisions at √s = 7 and 8 TeV and combined constraints on triple gauge couplings

Abstract: Measurements of the ZZ production cross sections in proton-proton collisions at center-of-mass energies of 7 and 8 TeV are presented. Candidate events for the leptonic decay mode ZZ to 2 l 2 nu, where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6) inverse femtobarns at 7 (8) TeV collected with the CMS experiment. The measured cross sections, sigma(pp to ZZ) = 5.2 -1.4 +1.5 (stat) -1.1 +1.4 (syst) +/- 0.2 (lumi) pb at 7 TeV, and 6.9 -0.8 +0.8 (stat.) -1.4 +1.8 (syst) +/- 0.3 (lumi) pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. The selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. These limits are then combined with the previously published CMS results for ZZ in 4 l final states, yielding the most stringent constraints on the anomalous couplings.

Efficient numerical integration of stiff differential equations in polymerisation reaction engineering: Computational aspects and applications

Abstract: The modelling of the full molecular weight distribution in addition polymerisation gives rise to very large dimension (103–106) systems of ordinary differential equations, often exhibiting serious stiffness issues. This article summarises a methodology recently implemented by our group, in which the QSSA is applied on the fast dynamic species in order to reduce the stiffness, and then the remaining equations are solved by computationally inexpensive explicit algorithms (such as Euler). Specific features of the methodology are illustrated by application to the academically and industrially relevant systems of controlled radical polymerisation (RAFT and NMP cases) and coordination catalysis polymerisation. © 2012 Canadian Society for Chemical Engineering