Papers by Alexandra Vásquez
Globalization of Food Retailing and Transformation of Supply Networks: Consequences for Small-scale Agricultural Producers in Southeastern Mexico
Journal of Latin American Geography, 2007
... Emily Morgan, Mount Holyoke College Alexandra Teachout, Western Michigan University Katie Vas... more ... Emily Morgan, Mount Holyoke College Alexandra Teachout, Western Michigan University Katie VasqueZ, Central Michigan University Abstract The previous decade has witnessed an unprecedented expansion and consolidation of supermarket chains on a global scale. ...
Interação cobre, molibdênio e enxofre em ruminantes
Ciencia Rural, 2001
... Molibdênio (Mo) e enxofre (S) têm sido identificados como os antagonistas do Cu de maior impo... more ... Molibdênio (Mo) e enxofre (S) têm sido identificados como os antagonistas do Cu de maior importância (HUMPHRIES et al., 1983). McDOWELL et al. ... Revista de Medicina Veterinaria, v.80, p.14-18, 1999. [ Links ]. CARDOSO, EC, McDOWELL, LR, VALE, WG, et al. ...
Journal of High Energy Physics, 2011
First measurements of dihadron correlations for charged particles are presented for central PbPb ... more First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity (∆η) and the full range of relative azimuthal angle (∆φ). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (∆φ ≈ π) azimuthal correlation is observed at all ∆η, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in ∆η are observed for particles with similar φ values. This phenomenon, also known as the "ridge", persists up to at least |∆η| = 4. For particles with transverse momenta
Results are presented from a search for a W boson using a dataset corresponding to 5.0 fb −1 of i... more Results are presented from a search for a W boson using a dataset corresponding to 5.0 fb −1 of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at √ s = 7 TeV. The W boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both lefthanded and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W → tb, leading to a final state signature with a single electron or muon, missing transverse energy, and jets, at least one of which is identified as a b-jet. A W boson that couples to the right-handed (left-handed) chiral projections of the fermions with the same coupling constants as the W is excluded for masses below 1.85 (1.51) TeV at the 95% confidence level. For the first time using LHC data, constraints on the W gauge couplings for a set of left-and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.
European Physical Journal C, 2011
A measurement of the tt production cross section in proton-proton collisions at a centre-of-mass ... more A measurement of the tt production cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been performed at the LHC with the CMS detector. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb −1 and is based on the reconstruction of the final state with one isolated, high transverse-momentum electron or muon and three or more hadronic jets. The kinematic properties of the events are used to separate the tt signal from W+jets and QCD multijet background events. The measured cross section is 173 +39 −32 (stat. + syst.) pb, consistent with standard model expectations.
Yields of prompt and non-prompt J/ψ, as well as Υ(1S) mesons, are measured by the CMS experiment ... more Yields of prompt and non-prompt J/ψ, as well as Υ(1S) mesons, are measured by the CMS experiment via their µ + µ − decays in PbPb and pp collisions at √ s NN = 2.76 TeV for quarkonium rapidity |y| < 2.4. Differential cross sections and nuclear modification factors are reported as functions of y and transverse momentum p T , as well as collision centrality. For prompt J/ψ with relatively high p T (6.5 < p T < 30 GeV/c), a strong, centrality-dependent suppression is observed in PbPb collisions, compared to the yield in pp collisions scaled by the number of inelastic nucleon-nucleon collisions.
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Papers by Alexandra Vásquez