98 research outputs found
Multi-Moment Advection scheme for Vlasov simulations
We present a new numerical scheme for solving the advection equation and its
application to Vlasov simulations. The scheme treats not only point values of a
profile but also its zeroth to second order piecewise moments as dependent
variables, for better conservation of the information entropy. We have
developed one- and two-dimensional schemes and show that they provide quite
accurate solutions within reasonable usage of computational resources compared
to other existing schemes. The two-dimensional scheme can accurately solve the
solid body rotation problem of a gaussian profile for more than hundred
rotation periods with little numerical diffusion. This is crucially important
for Vlasov simulations of magnetized plasmas. Applications of the one- and
two-dimensional schemes to electrostatic and electromagnetic Vlasov simulations
are presented with some benchmark tests.Comment: 52 pages, 18 figures, accepted for the publication in Journal of
Computational Physic
Combination of glycopyrronium and indacaterol inhibits carbachol-induced ERK5 signal in fibrotic processes
Search for Axionlike Particles Produced in e⁺ e⁻ Collisions at Belle II
International audienceWe present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e+e-→γa, a→γγ in the mass range 0.2
Erratum to: Combined analysis of Belle and Belle II data to determine the CKM angle ϕ3 using B+ → D(K0Sh+h−)h+ decays
Precise measurement of the lifetime at Belle II
We measure the lifetime of the meson using a data sample of 207
fb collected by the Belle II experiment running at the SuperKEKB
asymmetric-energy collider. The lifetime is determined by fitting the
decay-time distribution of a sample of
decays. Our result is \tau^{}_{D^+_s} = (498.7\pm
1.7\,^{+1.1}_{-0.8}) fs, where the first uncertainty is statistical and the
second is systematic. This result is significantly more precise than previous
measurements.Comment: 7 pages, 4 figures, to be submitted to Physical Review Letter
Measurement of the lifetime
An absolute measurement of the lifetime is reported using
decays in events reconstructed from data
collected by the Belle II experiment at the SuperKEKB asymmetric-energy
electron-positron collider. The total integrated luminosity of the data sample,
which was collected at center-of-mass energies at or near the
resonance, is 207.2~\mbox{fb}^{-1}. The result, fs, is the most precise
measurement to date and is consistent with previous determinations.Comment: Accepted for publication in PR
Precise Measurement of the D and D Lifetimes at Belle II
We report a measurement of the D and D lifetimes using D→Kπ and D→Kππ decays reconstructed in ee→ data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy ee collider. The data, collected at center-of-mass energies at or near the Υ(4S) resonance, correspond to an integrated luminosity of 72 fb. The results, τ(D)=410.5±1.1(stat)±0.8(syst) fs and τ(D)=1030.4±4.7(stat)±3.1(syst) fs, are the most precise to date and are consistent with previous determinations
First measurement of as an inclusive test of the anomaly
We measure the tau-to-light-lepton ratio of inclusive -meson branching
fractions , where indicates an electron or muon, and thereby test
the universality of charged-current weak interactions. We select events that
have one fully reconstructed meson and a charged lepton candidate from
of electron-positron collision data collected with the
Belle II detector. We find , in agreement with standard-model expectations. This
is the first direct measurement of
Measurement of branching fractions and direct asymmetries for and decays at Belle II
We report measurements of the branching fractions and direct
asymmetries of the decays , , , and , and use these for testing the standard
model through an isospin-based sum rule. In addition, we measure the branching
fraction and direct asymmetry of the decay and
the branching fraction of the decay . The data are
collected with the Belle II detector from collisions at the
resonance produced by the SuperKEKB asymmetric-energy collider
and contain bottom-antibottom meson pairs. Signal yields are
determined in two-dimensional fits to background-discriminating variables, and
range from 500 to 3900 decays, depending on the channel. We obtain for the sum rule, in agreement with the standard model
expectation of zero and with a precision comparable to the best existing
determinations
Measurement of asymmetries and branching-fraction ratios for and with using Belle and Belle II data
We measure asymmetries and branching-fraction ratios for and decays with , where
is a superposition of and . We use the full data set of the
Belle experiment, containing pairs, and data from the
Belle~II experiment, containing pairs, both collected
in electron-positron collisions at the resonance. Our results
provide model-independent information on the unitarity triangle angle .Comment: 26 pages, 8 figure
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