The influence of motivations and barriers in the benefits. An empirical study of EMAS certified business in Spain

The main objective of this research is to analyze through a structured questionnaire, the influence of the motivations that lead companies to implement Eco-Management and Audit Scheme (EMAS) and the barriers found in the benefits perceived by companies, as well as, the degree of difficulty perceived for the implementation of the different requirements to be fulfilled, which are established in the regulation. An extensive review of the academic literature published on motivations, barriers, difficulties and benefits in environmental standards has been carried out in order to establish the working hypotheses which refer to the relationship between motivations, barriers with the benefits and degree of difficulty in implementing the requirements. The empirical investigation was carried out in a sample of 114 of the 255 companies of the Autonomous Community of Galicia (Spain) that have EMAS certification. The methodology used was the use of the application of a regression analysis to test the hypotheses; previously the measurement scales were validated and an exploratory factorial analysis was applied in order to determine the structure of the different variables considered in the study. The results show that the motivations affect the benefits positively and on the contrary, affect the barriers negatively (reduce them) and it was observed that the greater the barriers, the lower the benefits obtained from the implementation of EMAS (negative influence). The proposed regression models show the joint influence of the motivations and barriers on the benefits considered.info:eu-repo/semantics/acceptedVersio

Measurement of ϒ production in pp collisions at √s = 2.76 TeV

The production of ϒ(1S), ϒ(2S) and ϒ(3S) mesons decaying into the dimuon final state is studied with the LHCb detector using a data sample corresponding to an integrated luminosity of 3.3 pb−1 collected in proton–proton collisions at a centre-of-mass energy of √s = 2.76 TeV. The differential production cross-sections times dimuon branching fractions are measured as functions of the ϒ transverse momentum and rapidity, over the ranges pT < 15 GeV/c and 2.0 < y < 4.5. The total cross-sections in this kinematic region, assuming unpolarised production, are measured to be σ (pp → ϒ(1S)X) × B ϒ(1S)→μ+μ− = 1.111 ± 0.043 ± 0.044 nb, σ (pp → ϒ(2S)X) × B ϒ(2S)→μ+μ− = 0.264 ± 0.023 ± 0.011 nb, σ (pp → ϒ(3S)X) × B ϒ(3S)→μ+μ− = 0.159 ± 0.020 ± 0.007 nb, where the first uncertainty is statistical and the second systematic

Study of the doubly charmed tetraquark T+cc

Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T+cc tetraquark with a quark content of ccu⎯⎯⎯d⎯⎯⎯ and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector T+cc state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T+cc state. In addition, an unexpected dependence of the production rate on track multiplicity is observed