Measurement of angular parameters from the decay B⁰ → K⁎0^{⁎0} μ⁺ μ⁻ in proton–proton collisions at √s 8 TeV

Angular distributions of the decay B⁰  → K$^{⁎0}$ μ⁺ μ⁻ are studied using a sample of proton–proton collisions at √s=8TeV collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 20.5fb⁻¹ . An angular analysis is performed to determine the P₁ and P$^{\u27}$₅ parameters, where the P$^{\u27}$₅ parameter is of particular interest because of recent measurements that indicate a potential discrepancy with the standard model predictions. Based on a sample of 1397 signal events, the P₁ and P$^{\u27}$₅ parameters are determined as a function of the dimuon invariant mass squared. The measurements are in agreement with predictions based on the standard model

Search for gauge-mediated supersymmetry in events with at least one photon and missing transverse momentum in pp collisions at √s = 13 TeV

A search for gauge-mediated supersymmetry (SUSY) in final states with photons and large missing transverse momentum is presented. The data sample of pp collisions at s=13TeV was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 35.9 fb−1. Data are compared with models in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape detection. The event selection is optimized for both electroweak (EWK) and strong production SUSY scenarios. The observed data are consistent with standard model predictions, and limits are set in the context of a general gauge mediation model in which gaugino masses up to 980 GeV are excluded at 95% confidence level. Gaugino masses below 780 and 950 GeV are excluded in two simplified models with EWK production of mass-degenerate charginos and neutralinos. Stringent limits are set on simplified models based on gluino and squark pair production, excluding gluino (squark) masses up to 2100 (1750) GeV depending on the assumptions made for the decay modes and intermediate particle masses. This analysis sets the highest mass limits to date in the studied EWK models, and in the considered strong production models when the mass difference between the gauginos and the squarks or gluinos is small

Search for excited quarks of light and heavy flavor in γ + jet final states in proton–proton collisions at √s = 13 TeV

A search is presented for excited quarks of light and heavy flavor that decay to γ+jet final states. The analysis is based on data corresponding to an integrated luminosity of 35.9 fb⁻¹ collected by the CMS experiment in proton–proton collisions at √s=13TeV at the LHC. A signal would appear as a resonant contribution to the invariant mass spectrum of the γ+jet system, above the background expected from standard model processes. No resonant excess is found, and upper limits are set on the product of the excited quark cross section and its branching fraction as a function of its mass. These are the most stringent limits to date in the γ+jet final state, and exclude excited light quarks with masses below 5.5 TeV and excited b quarks with masses below 1.8 TeV, assuming standard model like coupling strengths

Search for pair production of excited top quarks in the lepton + jets final state

A search is performed for the pair production of spin-3/2 excited top quarks, each decaying to a top quark and a gluon. The search uses the data collected with the CMS detector from proton–proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9  fb−1 . Events are selected by requiring an isolated muon or electron, an imbalance in the transverse momentum, and at least six jets of which exactly two must be compatible with originating from the fragmentation of a bottom quark. No significant excess over the standard model predictions is found. A lower limit of 1.2 TeV is set at 95% confidence level on the mass of the spin-3/2 excited top quark in an extension of the Randall–Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. These are the best limits to date in a search for excited top quarks and the first at 13 TeV

Analyse quantitative des obstacles sanitaires, phytosanitaires et techniques au commerce international

International audienceL'article présente une revue de la littérature sur la représentation des barrières non tarifaires dans le commerce international, et donne des pistes sur la façon dont elles peuvent être prises en compte dans les modélisations économiques. Une attention particulière est portée à la quantification des effets des obstacles sanitaires et phytosanitaires dans le domaine de l'agriculture et de l'alimentation

Le commerce agricole et le cycle de Doha : leçons des études sur les produits

Briefing paper ; 03 BP 42 Diffusion du document : CARD Iowa State University 568 Heady Hall Ames IA 5001-1070 (USA) UMR Inra-AgroParisTech Economie publiqueLe travail s'inscrit dans une série d'études de la Banque mondiale sur la libéralisation des échanges agricoles. Il porte sur la dimension Nord-Sud du débat sur le commerce agricole, avec les barrières douanières du Nord, les subventions et l'augmentation des tarifs douaniers. Il souligne aussi les défis Sud-Sud sur la protection des frontières et les impacts négatifs sur les revenus agricoles au Sud du fait des politiques agricoles au Nord. Les négociations commerciales agricoles devraient entraîner des concessions dans d'autres secteurs (services et doits de propriété intellectuelle par exemple) pour identifier des groupes de réformes acceptables pour toutes les parties

Demande urbaine pour les huiles végétales et les graisses végétales en Chine : les données d'ensemble pour les ménages

International audienceLa demande finale d'huiles végétales est estimée dans trois régions de Chine en utilisant des données sur les ménages urbains de 1992 à 1998. L'estimation est basée sur un système incomplet de demande. Pour chaque région, la demande d'huile de base apparaît inélastique, alors que la demande pour les huiles secondaires est plus réactive au changement de prix. La part des graisses animales dans le total des huiles comestibles décroît avec un revenu qui augmente. Les ménages les plus âgés et les plus petits ont une consommation par tête plus importante d'huiles et de graisses. La mesure exacte des pertes de bien-être du consommateur urbain, associée aux restrictions sur le commerce des huiles végétales importées, indique que ces consommateurs urbains supportent une perte significative de surplus de 679 millions de dollars en 1998