Nietzsches gelijk: Waarom wijsheid achteraf onbillijk is

A search is performed for a massive new vector-like quark T, with charge 2/3, that is pair produced together with its antiparticle in proton-proton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at sqrt(s) = 8 TeV and correspond to an integrated luminosity of 19.5 inverse femtobarns. The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark

Observation of the diphoton decay of the Higgs boson and measurement of its properties

Peer reviewe

Measurement of the Zγ production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings

Open Access, Copyright CERN, for the benefit of the CMS Collaboration. Article funded by SCOAP3.Abstract: The cross section for the production of Zγ in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb−1. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZγ and Zγγ are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson

Search for lepton-flavour-violating decays of the Higgs boson

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Search for neutral resonances decaying into a Z boson and a pair of b jets or tau leptons

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BREMSSTRAHLUNG THERMIQUE COMME SONDE DE LA MULTIFRAGMENTATION NUCLEAIRE DANS LES COLLISIONS NOYAU-NOYAU AUX ENERGIES DE FERMI

CETTE THESE ABORDE L'ETUDE DE LA MATIERE NUCLEAIRE A DES TEMPERATURES ET DES DENSITES MODEREES, TELLE QU'ELLE EST PRODUITE DANS DES COLLISIONS NOYAU-NOYAU A DES ENERGIES INCIDENTES VOISINES DE L'ENERGIE DE FERMI. LA DYNAMIQUE DES REACTIONS ET L'ETAT THERMODYNAMIQUE DES SYSTEMES NUCLEAIRES, CHAUFFES ET COMPRIMES A DES VALEURS OU L'ON S'ATTEND A OBSERVER LA TRANSITION LIQUIDE-GAZ DE LA MATIERE NUCLEAIRE, SONT ETUDIES EN UTILISANT LES PHOTONS DURS (EG>30 MEV) COMME SONDE EXPERIMENTALE. CES PHOTONS DURS SONT EMIS LORS DES COLLISIONS ELEMENTAIRES DE BREMSSTRAHLUNG (RAYONNEMENT DE FREINAGE) ENTRE PROTONS ET NEUTRONS (PN) DANS LA ZONE PARTICIPANTE. POUR LA PREMIERE FOIS, UNE TELLE ETUDE A ETE REALISEE DE FACON SYSTEMATIQUE LORS D'UNE MEME MESURE, EN CONSIDERANT QUATRE SYSTEMES DIFFERENTS (36AR + 197AU, 107AG, 58NI, 12C A 60A MEV), ET EN ANALYSANT DES MODES DE PRODUCTION EXCLUSIFS ET INCLUSIFS. CETTE APPROCHE A ETE RENDUE POSSIBLE EN EXPLOITANT LA COMBINAISON UNIQUE D'UN SPECTROMETRE DE PHOTONS, TAPS, ET DEUX MULTIDETECTORS DE PARTICULES-CHARGES, LE DWARF-BALL ET LE FORWARD-WALL, OFFRANT UNE COUVERTURE DE L'ANGLE SOLIDE VOISINE DE 4PI. NOUS CONFIRMONS L'ORIGINE DOMINANTE DES PHOTONS COMME ETANT DUE AUX COLLISIONS PN DE BREMSSTRAHLUNG DE PREMIER-CHANCE (HORS EQUILIBRE). NOUS ETABLISSONS DE FACON DEFINITIVE L'EXISTENCE D'UNE EMISSION THERMIQUE DE PHOTONS EN REACTIONS SEMI-CENTRALES ET CENTRALES NOYAU-NOYAU IMPLIQUANT DES CIBLES LOURDES ET ATTRIBUONS SON ORIGINE AU BREMSSTRAHLUNG EMIS DANS LES COLLISIONS PN DE DEUXIEME-CHANCE. NOUS EXPLOITONS CETTE OBSERVATION I) POUR DEMONTRER QUE LA MATIERE NUCLEAIRE ATTEINT UN EQUILIBRE THERMIQUE LORS DE LA REACTION, II) POUR VALIDER UN NOUVEAU THERMOMETRE BASE SUR DES PHOTONS DU RAYONNEMENT DE FREINAGE, III) POUR DEDUIRE LES PROPRIETES THERMODYNAMIQUES DE LA MATIERE NUCLEAIRE CHAUDE (EN PARTICULIER, POUR ETABLIR LA COURBE CALORIQUE) ET IV) POUR EVALUER LES ECHELLES DE TEMPS DU PROCESSUS DE FRAGMENTATION. ADDITIONNELLEMENT, DES SIMULATIONS MICROSCOPIQUES DETAILLEES DES QUATRE REACTIONS CONSIDEREES, ONT ETE EFFECTUEES AVEC DEUX MODELES DE TRANSPORT DIFFERENTS BASES SUR L'EQUATION DE TRANSPORT DE BOLTZMANN (BUU) ET SUR LA DYNAMIQUE MOLECULAIRE (QMD), AFIN D'IDENTIFIER DANS L'ESPACE ET LE TEMPS LES SOURCES DES PHOTONS DE BREMSSTRAHLUNG ET DETERMINER LEUR DEGRE DE THERMALIZATION AU MOMENT D'EMISSION DES PHOTONS.CAEN-BU Sciences et STAPS (141182103) / SudocSudocFranceF

Single-inclusive production of large-pT charged particles in hadronic collisions at TeV energies and perturbative QCD predictions

The single inclusive spectrum of charged particles with transverse momenta pT = 3 – 150 GeV/c measured at midrapidity by the CDF experiment in proton-antiproton $\left( {p - \bar{p}} \right)$ collisions at $\sqrt {s} = 1.96{\text{ TeV}}$ is compared to next-to-leading order (NLO) perturbative QCD calculations using the most recent parametrizations of the parton distributions and parton-to-hadron fragmentation functions. Above pT ≈ 20 GeV/c, there is a very sizeable disagreement of the Tevatron data compared to the NLO predictions and to xT-scaling expectations, suggesting a problem in the experimental data. We also present the predictions for the pT-differential charged hadron spectra and the associated theoretical uncertainties for proton-proton (p-p) collisions at LHC energies $\left( {\sqrt {s} = 0.9 - 14{\text{ TeV}}} \right)$. Two procedures to estimate the charged hadron spectra at LHC heavy-ion collision energies $\left(\sqrt {s} = 2.76 \right)$, 5.5 TeV) from p-p measurements are suggested

Partial Replacement of Fish Meal with Plant Protein Sources Singly and in Combination in Diets for Summer Flounder, Paralichthys dentatus

Soybean meal (SBM), corn gluten meal (CGM), and canola protein concentrate (CPC) as alternative protein sources to fish meal (FM) were individually evaluated for growth performance at 0, 20, 30, 40, and 50% replacement with amino acid (AA) supplementation using juvenile summer flounder, Paralichthys dentatus, in an 8-wk feeding. Two-way ANOVA indicated no significant main effect for plant protein source, but a significant main effect for replacement level. Comparison of the individual treatments revealed significant differences in weight gain (WG) between the FM treatment and 50% replacement level for all protein sources, as well as between the FM treatment and 30% replacement with CPC. Replacement of FM with SBM at 40% resulted in the least cost/kg WG. In a follow-up study, a combination of SBM-CGM-CPC at 40% replacement was evaluated with and without AA, phytase (0.2%), or taurine (1%), versus FM and SBM (40% replacement of FM) with AA. The SBM-CGM-CPC diet with either AA or taurine provided a significantly better food conversion ratio and less cost/kg WG than the SBM diet, and the SBM-CGM-CPC diet with taurine provided a significantly better protein efficiency ratio than the SBM diet. On the basis of these results, more study of taurine in plant protein diets for summer flounder appears warranted. © by the World Aquaculture Society 2011

Search for CP violation in D+→K−K+π+ decays

A model-independent search for direct C P violation in the Cabibbo-suppressed decay D + → K − K + π + in a sample of approximately 370 000 decays is carried out. The data were collected by the LHCb experiment in 2010 and correspond to an integrated luminosity of 35     pb − 1 . The normalized Dalitz plot distributions for D + and D − are compared using four different binning schemes that are sensitive to different manifestations of C P violation. No evidence for C P asymmetry is found

Determination of fs/fd for 7 TeV pp Collisions and Measurement of the B0→D−K+ Branching Fraction

The relative abundance of the three decay modes B 0 → D − K + , B 0 → D − π + , and B 0 s → D − s π + produced in 7 TeV p p collisions at the LHC is determined from data corresponding to an integrated luminosity of 35     pb − 1 . The branching fraction of B 0 → D − K + is found to be B ( B 0 → D − K + ) = ( 2.01 ± 0.18 stat ± 0.14 syst ) × 10 − 4 . The ratio of fragmentation fractions f s / f d is determined through the relative abundance of B 0 s → D − s π + to B 0 → D − K + and B 0 → D − π + , leading to f s / f d = 0.253 ± 0.017 ± 0.017 ± 0.020 , where the uncertainties are statistical, systematic, and theoretical, respectively