Small eigenvalues of the low temperature linear relaxation Boltzmann equation with a confining potential

We study the linear relaxation Boltzmann equation, a simple semiclassical kinetic model. We provide a resolvent estimate for an associated non-selfadjoint operator as well as an estimate on the return to equilibrium. This is done using a scaling argument and non-semiclassical hypocoercive estimate.Comment: 17 page

Non-leptonic charmless Bc decays and their search at LHCb

We discuss the decay of Bc mesons into two light mesons (pi, K^(*), eta', rho, omega, phi). All these decay channels come from a single type of diagram, namely tree annihilation. This allows us to derive extremely simple SU(3) relations among these processes. The size of annihilation contributions is an important issue in B physics, and we provide two different estimates in the case of non-leptonic charmless Bc decays, either a comparison with annihilation decays of heavy-light mesons or a perturbative model inspired by QCD factorisation. We finally discuss a possible search for these channels at LHCb.Comment: 22 pages, 1 figur

Incidence des contraintes culturales sur le développement et le potentiel de maturation de la mangue (Mangifera indica L. LIRFA)

La culture de mangues est en plein essor sur l'île de la Réunion. La préservation des caractéristiques organoleptiques et nutritionnelles des fruits représente un enjeu important tant pour les marchés locaux que pour l'export. L'incidence des contraintes culturales sur les fruits à la récolte est étudiée afin de relier la qualité initiale acquise au champ à la qualité finale après traitements de conservation. Dans cette optique, des paramètres agronomiques de stress (disponibilité en assimilats carbonés et fourniture en eau) sont appliqués aux manguiers. La caractérisation biochimique et morphologique des mangues est étudiée pour 1 2 stades de récolte. Les mangues bénéficiant d'une disponibilité supérieure en assimilats carbonés sont plus lourds et moins acides. Ils accumulent plus de saccharose, amidon, et cations mobiles (potassium et magnésium).Les teneurs en acides organiques ne sont pas modifiés par les contraintes culturales. L'irrigation ne semble pas avoir d'effet sur la composition biochimique de la mangue. L'effet des stress cumulés (forte charge en fruit, non irrigué) a un impact sur le métabolisme des sucres mis en oeuvre lors de la maturation et sur la synthèse d'ACC libre (Acide 1 -aminocyclopropane- 1 -carboxylique, précurseur de l'éthylène). Le potentiel de maturation de ces fruits est donc modifié par les conditions culturales. (Résumé d’auteur

Prompt Jpsi and b->Jpsi X production in pp collisions

International audienceThe LHCb measurement of the J/ψ production cross-section is presented. The double differential cross-section is measured as a function of the J/ψ transverse momentum pT and of the J/ψ rapidity y in the fiducial region pT∈[0;14],GeV/c and y∈[2.0;4.5]. The analysis is based on a sample of 5.2 pb−1 collected in September 2010 at the pp Large Hadron Collider at CERN, at a centre-of-mass energy of s = 7TeV. The contributions from prompt J/ψ and J/ψ from b are separated using the J/ψ pseudo-proper time

Placing the distant other on the shelf : an analysis and comparison of (fair trade) coffee packages in relation to commodity fetishism

Fair trade has been praised for ‘de-fetishizing’ commodities by providing consumers with information on the production of the commodity. Various empirical studies of fair trade marketing materials have generated critique of this vision. However, these focused on materials produced by engaged fair trade organizations. As the fair trade concept has entered the mainstream, fair trade products have found their way into supermarkets. In this setting, these products are confronted with competition, both internal (with other fair trade products) and external (with non-fair trade products). In this article, we argue for a broader focus when studying the relationship between fair trade and defetishization. Our argument is based on a study of whether and how defetishization is advanced on packages of ground coffee within the retail landscape of Flanders, Belgium. Several categories of packages can be distinguished, based on brand (e.g., fair trade advocate, regular brand, retailer house brand) and label (e.g. fair trade label; other social label; no label, but origin is emphasized in the product name). We demonstrate the difficulty of distinguishing these packages based on the visual and textual information they carry (beyond the label), which complicates the identification of any clearly distinct ‘fair trade message’ on these packages. Instead of serving a clear ‘defetishizing’ function, these messages are mixed, interchanged, and adapted. We argue that this could be a direct consequence of perceived or actual changes in the consumer publics inherent to the mainstreaming of fair trade