We present a combined analysis of the electromagnetic form factors nucleon in space- and timelike regions using dispersion theory. Our framework provides consistent description experimental data over full range momentum transfer, line with strictures from analyticity unitarity. The statistical uncertainties extracted are estimated bootstrap method, while systematic errors determined variations spectral functions. also perform high-precision extraction radii find good agreement previous...

Abstract The heaviest rainfall in 6 decades fell Beijing on 21 July 2012 with a record‐breaking amount of 460 mm 18 h and hourly rates exceeding 85 mm. This extreme event appeared to be reasonably well predicted by current operational models, albeit notable timing location errors. However, our analysis reveals that the model‐predicted results mainly from topographical lifting passage cold front, whereas observed was mostly generated convective cells were triggered local topography then...

We investigate the observed pentaquark candidates $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ from latest LHCb measurement, as well four possible spin partners in $\bar{D}^{(*)}\Sigma_c^*$ system predicted heavy quark symmetry with hadronic molecule scenarios. Similar to previous calculation on $P_c(4380)$ $P_c(4450)$, partial widths of all allowed decay channels for these $P_c$ states are estimated effective Lagrangian method. The cutoff dependence our numerical results also presented....

The ${P}_{c}(4380)$ and ${P}_{c}(4450)$ states observed recently by the LHCb experiment were proposed to be either $\overline{D}{\mathrm{\ensuremath{\Sigma}}}_{c}^{*}$ or ${\overline{D}}^{*}{\mathrm{\ensuremath{\Sigma}}}_{c}$ bound states. We analyze decay behaviors of two such types hadronic molecules within effective Lagrangian framework. With branching ratios ten possible channels calculated, it is found that have distinguishable patterns. While molecule decays dominantly...

We review the dispersion-theoretical analysis of electromagnetic form factors nucleon. emphasize in particular role unitarity and analyticity construction isoscalar isovector spectral functions. present new results on extraction nucleon radii, electric magnetic $\omega$-meson couplings. All this is supplemented by a detailed calculation theoretical uncertainties, using bootstrap Bayesian methods to pin down statistical errors, while systematic errors are determined from variations also...

Using dispersion theory with an improved description of the two-pion continuum based on precise Roy-Steiner analysis pion-nucleon scattering, we analyze recent data from electron-proton scattering. This allows for a high-precision determination electric and magnetic radius proton, rE=(0.838−0.004+0.005−0.003+0.004) fm rM=(0.847±0.004±0.004) fm, where first error refers to fitting procedure using bootstrap while second one systematic uncertainty related underlying spectral functions.

The effects of the $\Sigma_c\bar{D}^*$-$\Lambda_{c}(2595)\bar{D}$ coupled-channel dynamics and various one-boson-exchange (OBE) forces for LHCb pentaquark states, $P_c(4440)$ $P_c(4457)$, are reinvestigated. Both pion $\rho$-meson exchanges considered dynamics. It is found that role $\Lambda_{c}(2595)\bar{D}$ channel in descriptions $P_c(4457)$ states not significant with OBE parameters constrained by other experimental sources. naive models short-distance $\delta(\vec{r})$ term one-pion...

Abstract In the era of accelerated development in artificial intelligence as well explosive growth information and data throughput, underlying hardware devices that can integrate perception memory while simultaneously offering benefits low power consumption high transmission rates are particularly valuable. Neuromorphic inspired by human brain considered to be one most promising successors efficient in-sensory process. this paper, a homojunction-based multi-functional optoelectronic synapse...

Very recently, a new $\Omega^{*}$ state was reported by the Belle Collaboration, with its mass of $2012.4 \pm 0.7\ \text{(stat)}\pm 0.6\ \text{(syst)}\ \mathrm{MeV}$, which locates just below $K\Xi^*$ threshold and hence hints to be possible hadronic molecule. Using effective Lagrangian approach as same our previous works for other molecular states, we investigate decay behavior this $\Omega^*$ within picture. The results show that measured width can reproduced well dominant channel is...

The possibility of the Y(4260) being molecular state $D{\overline{D}}_{1}(2420)+\mathrm{c}.\mathrm{c}.$ is investigated in one boson exchange model. It turns out that potential ${J}^{PC}={1}^{\ensuremath{-}\ensuremath{-}}$ formed by attractive and strong enough to bind them together when momentum cutoff $\mathrm{\ensuremath{\Lambda}}\ensuremath{\gtrsim}1.4\text{ }\text{ }\mathrm{GeV}$. To produce with correct binding energy, we need...

Abstract Using a two-dimensional Fourier decomposition and four-dimensional ray-tracing technique, the propagating characteristics source mechanisms of mesoscale gravity waves simulated in idealized baroclinic jet-front systems are investigated. The successfully separates from complex background flow troposphere. Four groups lower stratosphere identified spectral decomposition. One is northward-propagating short-scale wave packet with horizontal wavelength ∼150 km, another...

We present a high-precision calculation of the recoil--finite-size correction to hyperfine splitting (HFS) in muonic and electronic hydrogen based on nucleon electromagnetic form factors obtained from dispersion theory. This will help guide upcoming searches HFS transition hydrogen, allow precise determination polarizability Zemach radius contributions when this is found.

Starting from an effective Lagrangian with heavy quark spin symmetry embedded, the coupled-channel dynamics of doubly charmed systems $D^{(*)} \Sigma_c^{(*)}$ is investigated. The potential underlying our investigation includes $t$-channel pseudoscalar and vector meson exchanges. A series $S$-wave bound states isospin $I=1/2$ found by applying first iterated solution $N/D$ method: one state binding energy $23$ MeV in $5/2^-$ $D^*\Sigma_c^*$ channel, three $26$, $30$ $7$ (relative to...

The ab initio valence bond (VB) methods, VBSCF and VBCI, are applied to the ground states covalent excited of polyenes C2nH2n+2 (n = 2-8) polyenyl radicals C2n-1H2n+1 2-8). excitation energy gap was computed at VB level, which is in good agreement with semiempirical method, VBDFT(s), experimental values as well molecular orbital theory based CASPT3 MRCI. wave functions systems also very those VBDFT(s) even though former on scheme while latter a Hückel type no optimization procedure...

Abstract The electromagnetic form factors of the $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math> hyperon in time-like region are determined precisely through a dispersion-theoretical analysis world data for cross section annihilation process $$e^+e^-\rightarrow {\bar{\Lambda }}{\Lambda }$$ <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>-</mml:mo> <mml:mo>→</mml:mo> <mml:mover> </mml:mrow>...

After the recent discovery of new ${\mathrm{\ensuremath{\Omega}}}^{*}$ state, ratio branching fractions $\mathrm{\ensuremath{\Omega}}(2012)\ensuremath{\rightarrow}\overline{K}\ensuremath{\pi}\mathrm{\ensuremath{\Xi}}$ relative to $\overline{K}\mathrm{\ensuremath{\Xi}}$ decay channel was investigated by Belle Collaboration. The measured 11.9% upper limit this is in sharp tension with $S$-wave $\overline{K}\mathrm{\ensuremath{\Xi}}(1530)$ molecule interpretation for...

Using dispersion theory, the electromagnetic Sigma-to-Lambda transition form factors are expressed as product of pion factor and $\Sigma\bar{\Lambda}\to\pi\pi$ scattering amplitudes with latter estimated from SU(3) chiral perturbation theory including baryon decuplet explicit degrees freedom. The contribution $K\bar{K}$ channel is also taken into account $\pi\pi$-$K\bar{K}$ coupled-channel effect included by means a two-channel Muskhelishvili-Omn\`{e}s representation. It found that electric...

The internal structure of the charm-strange mesons $D_{s0}^*(2317)$ and $D_{s1}(2460)$ are subject intensive studies. Their widths small because they decay dominantly through isospin-breaking hadronic channels $D_{s0}^*(2317)^+\to D_s^+\pi^0$ $D_{s1}(2460)^+\to D_s^{*+}\pi^0$. can also into final states $D_s^+\pi\pi$, conserving isospin. In that case there is, however, a strong suppression from phase space. We study transition D_s^+\pi^+\pi^-$ in scenario is $D^*K$ molecule. $\pi\pi$ state...