Search for jet extinction in the inclusive jet-pT spectrum from proton-proton collisions at s=8 TeV

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published articles title, journal citation, and DOI.The first search at the LHC for the extinction of QCD jet production is presented, using data collected with the CMS detector corresponding to an integrated luminosity of 10.7  fb−1 of proton-proton collisions at a center-of-mass energy of 8 TeV. The extinction model studied in this analysis is motivated by the search for signatures of strong gravity at the TeV scale (terascale gravity) and assumes the existence of string couplings in the strong-coupling limit. In this limit, the string model predicts the suppression of all high-transverse-momentum standard model processes, including jet production, beyond a certain energy scale. To test this prediction, the measured transverse-momentum spectrum is compared to the theoretical prediction of the standard model. No significant deficit of events is found at high transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on the extinction mass scale

Searches for electroweak neutralino and chargino production in channels with Higgs, Z, and W bosons in pp collisions at 8 TeV

Searches for supersymmetry (SUSY) are presented based on the electroweak pair production of neutralinos and charginos, leading to decay channels with Higgs, Z, and W bosons and undetected lightest SUSY particles (LSPs). The data sample corresponds to an integrated luminosity of about 19.5 fb(-1) of proton-proton collisions at a center-of-mass energy of 8 TeV collected in 2012 with the CMS detector at the LHC. The main emphasis is neutralino pair production in which each neutralino decays either to a Higgs boson (h) and an LSP or to a Z boson and an LSP, leading to hh, hZ, and ZZ states with missing transverse energy (E-T(miss)). A second aspect is chargino-neutralino pair production, leading to hW states with E-T(miss). The decays of a Higgs boson to a bottom-quark pair, to a photon pair, and to final states with leptons are considered in conjunction with hadronic and leptonic decay modes of the Z and W bosons. No evidence is found for supersymmetric particles, and 95% confidence level upper limits are evaluated for the respective pair production cross sections and for neutralino and chargino mass values

Copaíba (copaifera Sp.) Leaf Extracts Obtained By Co2 Supercritical Fluid Extraction: Isotherms Of Global Yield, Kinetics Data, Antioxidant Activity And Neuroprotective Effects

Copaíba (Copaifera sp.) is a tree with a wide application in Brazilian folk medicine. The copaíba leaf extract obtained using supercritical CO2 might be applied to afford neuroprotection following experimental stroke. This study aimed to obtain leaf extracts of Copaifera sp. via supercritical fluid extraction, assessing the global yield isotherms, process variables through the kinetic parameters of extraction, as well as antioxidant activity and neuroprotective effects. Three isotherms (40°C, 50°C and 60°C) were studied in the pressure range of 10-30MPa. The overall higher mass on dry basis yield (~3.8%) and antioxidant activity (~64%) were observed at 20MPa and 60°C. For the kinetic study of extraction, the extracts obtained with higher and lower antioxidant activity were chosen, and the models of Martinez et al., Tan and Liou and Sovová showed good and similar adjustments, as presented values of residual sum of squares in the order 10-2. The results of histological and immunohistochemical analyzes suggest that the extract obtained at 60°C and 20MPa has anti-inflammatory and neuroprotective effects on experimental stroke induced by microinjections of endothelin-1 (ET-1) into the rat brain