497 research outputs found
Measurement of the CKM angles gamma and 2 beta+gamma at B-factories
On behalf of the Babar and Belle collaborations, we report on the measurement
of the angle gamma and on the sum of angles 2 beta+gamma of the Unitarity
Triangle.Comment: Flavor Physics and CP Violation Conference, Vancouver, 2006. 10 pages
13 figures - corrected one referenc
Authors' Reply to Coste et al.: "LevothyroxÂź New and Old Formulations: Are they Switchable for Millions of Patients?"
"Authors'Reply to Coste et al"International audienc
Why Were More Than 200 Subjects Required to Demonstrate the Bioequivalence of a New Formulation of Levothyroxine with an Old One?
At the request of French Regulatory Authorities, a new formulation of LevothyroxÂź was licensed in France in 2017, with the objective of avoiding the stability deficiencies of an existing licensed formulation. Before launching the new formulation, an average bioequivalence (ABE) trial was conducted, having enrolled 204 subjects and selected for interpretation a narrow a priori bioequivalence range of 0.90â1.11. Bioequivalence was concluded. In a previous publication, we questioned the ability of an ABE trial to guarantee the switchability within patients of the new and old levothyroxine formulations. It was suggested that the two formulations should be compared using the conceptual framework of individual bioequivalence. The present paper is a response to those claiming that, despite the fact that ABE analysis does not formally address the switchability of the two formulations, future patients will nevertheless be fully protected. The basis for this claim is that the ABE study was established in a large trial and analyzed using a stringent a priori acceptance interval of equivalence. These claims are questionable, because the use of a very large number of subjects nullifies the implicit precautionary intention of the European guideline when, for a Narrow Therapeutic Index drug, it recommends shortening the a priori acceptance interval from 0.80â1.25 to 0.90â1.11
NectarCAM : a camera for the medium size telescopes of the Cherenkov Telescope Array
NectarCAM is a camera proposed for the medium-sized telescopes of the
Cherenkov Telescope Array (CTA) covering the central energy range of ~100 GeV
to ~30 TeV. It has a modular design and is based on the NECTAr chip, at the
heart of which is a GHz sampling Switched Capacitor Array and a 12-bit Analog
to Digital converter. The camera will be equipped with 265 7-photomultiplier
modules, covering a field of view of 8 degrees. Each module includes the
photomultiplier bases, high voltage supply, pre-amplifier, trigger, readout and
Ethernet transceiver. The recorded events last between a few nanoseconds and
tens of nanoseconds. The camera trigger will be flexible so as to minimize the
read-out dead-time of the NECTAr chips. NectarCAM is designed to sustain a data
rate of more than 4 kHz with less than 5\% dead time. The camera concept, the
design and tests of the various subcomponents and results of thermal and
electrical prototypes are presented. The design includes the mechanical
structure, cooling of the electronics, read-out, clock distribution, slow
control, data-acquisition, triggering, monitoring and services.Comment: In Proceedings of the 34th International Cosmic Ray Conference
(ICRC2015), The Hague, The Netherlands. All CTA contributions at
arXiv:1508.0589
LevothyroxÂź new and old formulations: are they switchable for millions of patients?
International audienceIn France, more than 2.5 million patients are currently treated with levothyroxine, mainly as the marketed product Levothyrox Âź. In March 2017, at the request of French authorities, a new formulation of Levothyrox Âź was licensed, with the objective of avoiding stability deficiencies of the old formulation. Before launching this new formulation, an average bioequivalence trial, based on European Union recommended guidelines, was performed. The implicit rationale was the assumption that the two products, being bioequivalent, would also be switchable, allowing substitution of the new for the old formulation, thus avoiding the need for individual calibration of the dosage regimen of thyroxine, using the thyroid-stimulating hormone level as the endpoint, as required for a new patient on initiating treatment. Despite the fact that both formulations were shown to be bioequivalent, adverse drug reactions were reported in several thousands of patients after taking the new formulation. In this opinion paper, we report that more than 50% of healthy volunteers enrolled in a successful regulatory average bioequivalence trial were actually outside the a priori bioequivalence range. Therefore, we question the ability of an average bioequivalence trial to guarantee the switchability within patients of the new and old levothyroxine formulations. We further propose an analysis of this problem using the conceptual framework of individual bioequivalence. This involves investigating the bioavailability of the two formulations within a subject, by comparing not only the population means (as established by average bioequivalence) but also by assessing two variance terms, namely the within-subject variance and the variance estimating subject-by-formulation interaction. A higher within individual variability for the new formulation would lead to reconsideration of the appropriateness of the new formulation. Alternatively, a possible subject-by-formulation interaction would allow a judgement on the ability, or not, of doctors to manage patients effectively during transition from the old to the new formulation
Search for rare or forbidden decays of the D0 meson
We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type D0âh'âhââ'+â+ and D0âh'âh+â'±ââ, where h and hâČ represent a K or Ï meson and â and ââČ an electron or muon. The analysis is based on 468 fbâ1 of e+eâ annihilation data collected at or close to the ΄(4S) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes, and we establish 90% confidence level upper limits on the branching fractions in the range (1.0â30.6)Ă10â7. The limits are between 1 and 3 orders of magnitude more stringent than previous measurements.publishedVersio
Light meson spectroscopy from Dalitz plot analyses of ηc decays to η0 K+Kâ , η0 Ï + Ï â , and Î·Ï + Ï â produced in two-photon interactions
We study the processes γγâηcâηâČK+Kâ, ηâČÏ+Ïâ, and ηÏ+Ïâ using a data sample of 519ââfbâ1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+eâ collider at center-of-mass energies at and near the ΄(nS) (n=2, 3, 4) resonances. This is the first observation of the decay ηcâηâČK+Kâ and we measure the branching fraction Î(ηcâηâČK+Kâ)/(Î(ηcâηâČÏ+Ïâ)=0.644±0.039stat±0.032sys. Significant interference is observed between γγâηcâηÏ+Ïâ and the nonresonant two-photon process γγâηÏ+Ïâ. A Dalitz plot analysis is performed of ηc decays to ηâČK+Kâ, ηâČÏ+Ïâ, and ηÏ+Ïâ. Combined with our previous analysis of ηcâKÂŻKÏ, we measure the Kâ0(1430) parameters and the ratio between its ηâČK and ÏK couplings. The decay ηcâηâČÏ+Ïâ is dominated by the f0(2100) resonance, also observed in J/Ï radiative decays. A new a0(1700)âÎ·Ï resonance is observed in the ηcâηÏ+Ïâ channel. We also compare ηc decays to η and ηâČ final states in association with scalar mesons as they relate to the identification of the scalar glueball.publishedVersio
Measurements of the absolute branching fractions of B± âk±Xc c
A study of the two-body decays B±âXcÂŻcK±, where XcÂŻc refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fbâ1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+âX(3872)K+ at the 3Ï level. The absolute branching fraction B[B+âX(3872)K+]=[2.1±0.6(stat)±0.3(syst)]Ă10â4 is measured for the first time. It follows that B[X(3872)âJ/ÏÏ+Ïâ]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.publishedVersio
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