6,529 research outputs found
Determination of P(c -> D*(+)) and BR(c -> l(+)) at LEP 1
No full textThe probability P(c --> D*(+)) that a charm quark fragments into a D*+ meson and the c --> l(+) semileptonic branching fraction were measured in Z(0) decay into c (c) over bar events. From the analysis of 3.5 Million Z(0) events collected from 1992 to 1995, a sample of charm meson decays with 81% c (c) over bar purity was selected. The product of the c --> D*(+) fragmentation probability times the D*(+) --> D(0)pi(+) branching fraction was measured to be: P(c --> D*(+)).BR(D*(+) --> D(0)pi(+)) = 0.174 +/- 0.010(stat) +/- 0.004(syst). Using the world averaged value for BR(D*+ --> D(0)pi(+)), the fragmentation probability is inferred: P(c --> D*(+)) = 0.255 +/- 0.015(stat) +/- 0.006(syst) +/- 0.005(syst.BR). From the same sample, 1828 +/- 51 identified leptons in the opposite hemisphere were selected. From this sample, the charm semileptonic branching fraction was measured to be: BR(c --> l(+)) = 0.0958 +/- 0.0042(stat) +/- 0.0028(syst)
A novel and efficient approach to discriminate between pre- and post-transcription HIV inhibitors.
No full textCoherent production of the K-π+π- system in K-d interactions at 4.5 GeV/c
No full textThe reaction K-d→K-π+π-d has been studied at an incident K--momentum of 4.5 GeV/c. A fractional analysis has been performed. A spin density matrix analysis and a partial wave analysis indicate that the events in the Q-region mainly originate from {Mathematical expression} production in a JPℓmη=(1+S0+) wave state. A comparison has been made with the reaction K+d→K+π-π+d at 4.6 GeV/c and the combined results have been compared to K+/-p→K+/-π+π-p at 13 GeV/c. It is found that the Kππ-mass spectra produced on a proton or deuteron target can be described by one single Deck type mechanism on which direct Q-meson production is superimposed. © 1980 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Quantitative analysis of transmission parameters for bluetongue virus serotype 8 in Western Europe in 2006
No full textAbstract The recent bluetongue virus serotype 8 (BTV-8) epidemic in Western Europe struck hard. Controlling the infection was difficult and a good and safe vaccine was not available until the spring of 2008. Little was known regarding BTV transmission in Western Europe or the efficacy of control measures. Quantitative details on transmission are essential to assess the potential and efficacy of such measures. To quantify virus transmission between herds, a temporal and a spatio-temporal analysis were applied to data on reported infected herds in 2006. We calculated the basic reproduction number between herds (Rh: expected number of new infections, generated by one initial infected herd in a susceptible environment). It was found to be of the same order of magnitude as that of an infection with Foot and Mouth Disease (FMD) in The Netherlands, e.g. around 4. We concluded that an average day temperature of at least 15°C is required for BTV-8 transmission between herds in Western Europe. A few degrees increase in temperature is found to lead to a major increase in BTV-8 transmission. We also found that the applied disease control (spatial zones based on 20 km radius restricting animal transport to outside regions) led to a spatial transmission pattern of BTV-8, with 85% of transmission restricted to a 20 km range. This 20 km equals the scale of the protection zones. We concluded that free animal movement led to substantial faster spread of the BTV-8 epidemic over space as compared to a situation with animal movement restrictions.</p
Nonenzymic Polycyclisation of Analogues of Oxidosqualene with a Preformed C-ring, Organic Biomolecular Chemistry
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Nuclear modification factor of D-0 mesons in PbPb collisions at root s(NN)=5.02 TeV
No full textThe transverse momentum (p(T)) spectrum of prompt D-0 mesons and their antiparticles has been measured via the hadronic decay channels D-0 -> K- pi(+) and (D) over bar (0) -> K+ pi(-) in pp and PbPb collisions at a centre-of-mass energy of 5.02 TeV per nucleon pair with the CMS detector at the LHC. The measurement is performed in the D-0 meson p(T) range of 2-100GeV/c and in the rapidity range of vertical bar y vertical bar < 1. The pp (PbPb) dataset used for this analysis corresponds to an integrated luminosity of 27.4 pb(-1) (530 mu b(-1)). The measured D-0 meson p(T) spectrum in pp collisions is well described by perturbative QCD calculations. The nuclear modification factor, comparing D-0 meson yields in PbPb and pp collisions, was extracted for both minimum-bias and the 10% most central PbPb interactions. For central events, the D-0 meson yield in the PbPb collisions is suppressed by a factor of 5-6 compared to the pp reference in the p(T) range of 6-10GeV/c. For D-0 mesons in the high-p(T) range of 60-100GeV/c, a significantly smaller suppression is observed. The results are also compared to theoretical calculations. (C) 2018 The Author(s). Published by Elsevier B.V
Determination of P(c → D*+) and BR(c → l+) at LEP 1
No full textThe probability P(c → D*+) that a charm quark fragments into a D*+ meson and the c → l+ semileptonic branching fraction were measured in Z0 decay into cc̄ events. From the analysis of 3.5 Million Z0 events collected from 1992 to 1995, a sample of charm meson decays with 81% cc̄ purity was selected. The product of the c → D*+ fragmentation probability times the D*+ → D0π+ branching fraction was measured to be: P(c → D*+) · BR(D*+ → D0π+) = 0.174 ± 0.010(stat) ± 0.004(syst). Using the world averaged value for BR(D*+ → D0π+), the fragmentation probability is inferred: P(c → D*+) = 0.255 ± 0.015(stat) ± 0.006(syst) ± 0.005(syst.BR). From the same sample, 1828 ± 51 identified leptons in the opposite hemisphere were selected. From this sample, the charm semileptonic branching fraction was measured to be: BR(c → l+) = 0.0958 ± 0.0042(stat) ± 0.0028(syst).0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
S-adenosylhomocysteine hydrolase inhibitors interfere with the replication of human immunodeficiency virus type 1 through inhibition of the LTR transactivation
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