Higlights

New insights on low energy πN scattering amplitudes: comprehensive analyses at
${{{\cal{O}}\left(p^3\right)}}$ level2019, 43(6): 064110106411022. doi: 10.1088/16741137/43/6/064110A production representation of partialwave S matrix is utilized to construct lowenergy elastic pionnucleon scattering amplitudes from cuts and poles on complex Riemann sheets. Among them, the contribution of lefthand cuts is estimated using the${\cal{O}}\left( {{p^3}} \right)$ results obtained in covariant baryon chiral perturbation theory within the extendedonnassshell scheme. By fitting to data on partialwave phase shifts, it is indicated that the existences of hidden poles in S_{11} and P_{11} channels, as conjectured in our previous paper [Eur. Phys. J. C, 78(7): 543 (2018)], are firmly established. Specifically, the pole mass of the S_{11} hidden resonance is determined to be (895±81)−(164±23)i MeV, whereas, the virtual pole in the P_{11} channel locates at (966±18) MeV. It is found that analyses at the${\cal{O}}\left( {{p^3}} \right)$ level improves significantly the fit quality, comparing with the previous${\cal{O}}\left( {{p^2}} \right)$ one. Quantitative studies with cautious physical discussions are also conducted for the other S and Pwave channels. 
Study of the
$ {{a_1}}$ (1260) resonance in the$ {{\gamma p \to \pi^+\pi^+\pi^ n}} $ reaction2019, 43(6): 06410410641046. doi: 10.1088/16741137/43/6/064104Within an effective Lagrangian approach and resonance model, we study the$ \gamma p \to a_1(1260)^+ n $ and$ \gamma p \to \pi^+\pi^+\pi^ n $ reactions via the$ \pi $ exchange mechanism. For the$ \gamma p \to \pi^+\pi^+\pi^ n $ reaction, we perform a calculation of the differential and total crosssections by considering the contributions of the$ a_1(1260) $ intermediate resonance decaying into$ \rho \pi $ and then into$ \pi^+\pi^+\pi^ $ . Besides, the nonresonance process is also considered. With a lower mass of$ a_1(1260) $ , the experimental data for the invariant$ \pi^+\pi^+\pi^ $ mass distributions can be fairly well reproduced. For the$ \gamma p \to a_1(1260)^+ n $ reaction, with the model parameters, the total crosssection is of the order of 10 μb at the photon beam energy$ E_{\gamma} $ ~2.5 GeV. It is expected that the model calculations in this work could be tested by future experiments. 
Structure, formation, and decay of
${{\bar{K}NN}}$ system by FaddeevAGS calculations2019, 43(6): 064101106410111. doi: 10.1088/16741137/43/6/064101The Faddeev AGS equations for the coupledchannels$\bar{K}NN\pi\Sigma{N}$ system with quantum numbers I = 1/2 and S = 0 are solved. Using separable potentials for the$\bar{K}N\pi\Sigma$ interaction, we calculate the transition probability for the$(Y_{K})_{I=0}+N\rightarrow\pi\Sigma{N}$ reaction. The possibility to observe the trace of the$K^{}pp$ quasibound state in$\pi\Sigma{N}$ mass spectra was studied. Various types of chiralbased and phenomenological potentials are used to describe the$\bar{K}N\pi\Sigma$ interaction. Finally, we show that we can observe the signature of the$K^{}pp$ quasibound state in the mass spectra, as well as the trace of branch points in the observables.
Just Accepted
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The relativistic corrections to the fragmentation functions for a heavy quark to B_{c} and B_{c}^{*}
Published: 20190521, doi: 10.1088/16741137/43/8/083101

Swave contributions in
${{{\bar B}_s^0\to (D^0,{\bar D}^0)\pi^+\pi^}}$ within perturbative QCD approachPublished: 20190521, doi: 10.1088/16741137/43/7/073103 
Restoration of pseudospin symmetry in N = 32 and 34 isotones described by relativistic HartreeFock theory
Published: 20190521, doi: 10.1088/16741137/43/7/074107
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Search for decay modes of heavy and superheavy nuclei
Published: 20190522, doi: 10.1088/16741137/43/7/074102Show AbstractSpontaneous fission (SF) with a new formula based on a liquid drop model is proposed and used in the calculation of the SF halflives of heavy and superheavy nuclei (Z = 90–120). The predicted halflives are in agreement with the experimental SF halflives. The halflives of
$ \alpha $ decay (AD) for the same nuclei are obtained by using the WentzelKramersBrillouin (WKB) method together with BohrSommerfeld (BS) quantization condition considering the isospindependent effects for the cosh potential. The decay modes and branching ratios of superheavy nuclei (Z = 104118) with experimental decay modes are obtained, and the modes are compared with the experimental ones and with the predictions found in the literature. Although some nuclei have predicted decay modes that are different from their experimental decay modes, decay modes same as the experimental ones are predicted for many nuclei. The SF and AD halflives, branching ratios, and decay modes are obtained for superheavy nuclei (Z = 119–120) with unknown decay modes and compared with the predictions obtained in a previous study. The present results provide useful information for future experimental studies performed on both the AD and SF of superheavy nuclei. 
Expected energy spectrum of cosmic ray protons and helium below 4 PeV measured by LHAASO
Published: 20190521, doi: 10.1088/16741137/43/7/075001Show AbstractThe Large High Altitude Air Shower Observatory (LHAASO) is a composite cosmic ray observatory consisting of three detector arrays: kilometer square array (KM2A), which includes the electromagnetic detector array and muon detector array, water Cherenkov detector array (WCDA) and wide fieldofview Cherenkov telescope array (WFCTA). One of the main scientific objectives of LHAASO is to precisely measure the cosmic rays energy spectrum of individual components from
$ 10^{14} $ eV to$ 10^{18} $ eV. The hybrid observation will be employed by the LHAASO experiment, in which the lateral and longitudinal distributions of extensive air shower can be observed simultaneously. Thus, many kinds of parameters can be used for primary nuclei identification. In this paper, high purity cosmic ray simulation samples of the light nuclei component are obtained using multivariable analysis. The apertures of 1/4 LHAASO array for pure proton and mixed proton and helium (H&He) samples are$ 900 \rm\ m^{2}Sr $ and$ 1800 \rm\ m^{2}Sr $ , respectively. Prospect of obtaining proton and H&He spectra from 100 TeV to 4 PeV is discussed. 
Nonparametric reconstruction of dark energy and cosmic expansion from the Pantheon compilation of type Ia supernovae
Published: 20190520, doi: 10.1088/16741137/43/7/075101Show AbstractThe equation of state (EoS) of dark energy plays an important role in the evolution of the universe and has attracted considerable interest in the recent years. With the progress in observational technique, a precise constraint on the EoS of dark energy can be obtained. In this study, we reconstruct the EoS of dark energy and cosmic expansion using Gaussian processes (GP) from the most uptodate Pantheon compilation of type Ia supernovae (SNe Ia), which consists of 1048 finely calibrated SNe Ia. The reconstructed EoS of dark energy has a large uncertainty owing to its dependence on the secondorder derivative of the construction. Adding the direct measurements of Hubble parameters
$H(z)$ as an additional constraint on the firstorder derivative can partially reduce the uncertainty; however, it is still not sufficiently precise to distinguish between the evolving and the constant dark energy. Moreover, the results heavily rely on the prior of the Hubble constant$H_0$ . The$H_0$ value inferred from SNe+$H(z)$ without prior is$H_0=70.5\pm 0.5~{\rm km~s^{1}~Mpc^{1}}$ . Moreover, the matter density$\Omega_M$ has a nonnegligible effect on the reconstruction of dark energy. Therefore, more accurate determinations on$H_0$ and$\Omega_M$ are required to tightly constrain the EoS of dark energy.
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ISSN 16741137 CN 115641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
 Particle physics
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 Particle and nuclear astrophysics
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