Highlights

Lattice study of twophoton decay widths for scalar and pseudoscalar charmonium
2020, 44(8): 083108. doi: 10.1088/16741137/44/8/083108This exploratory study computes twophoton decay widths of pseudoscalar (
$ \eta_c $ ) and scalar ($ \chi_{c0} $ ) charmonium using two ensembles of$ N_f = 2 $ twisted mass lattice QCD gauge configurations. The simulation is performed using two lattice ensembles with lattice spacings$ a = 0.067 $ fm with size$ 32^3\times{64} $ and$ a = 0.085 $ fm with size$ 24^3\times{48} $ . The decay widths for the two charmonia are obtained within the expected ballpark, but are however smaller than the experimental ones. Possible reasons for these discrepancies are discussed. 
Expected LHAASO sensitivity to decaying dark matter signatures from dwarf galaxies gammaray emission
2020, 44(8): 085001. doi: 10.1088/16741137/44/8/085001As a nextgeneration complex extensive air shower array with a large field of view, the large high altitude air shower observatory (LHAASO) is very sensitive to the veryhighenergy gamma rays from ~300 GeV to 1 PeV and may thus serve as an important probe for the heavy dark matter (DM) particles. In this study, we make a forecast for the LHAASO sensitivities to the gammaray signatures resulting from DM decay in dwarf spheroidal satellite galaxies (dSphs) within the LHAASO field of view. Both individual and combined limits for 19 dSphs incorporating the uncertainties of the DM density profile are explored. Owing to the large effective area and strong capability of the photonproton discrimination, we find that LHASSSO is sensitive to the signatures from decaying DM particles above
${\cal{O}}(1)$ TeV. The LHAASO sensitivity to the DM decay lifetime reaches${\cal{O}} (10^{26}) \sim {\cal{O}} (10^{28})$ s for several decay channels at the DM mass scale from 1 TeV to 100 TeV. 
Top quark pair production at complete NLO accuracy with NNLO+NNLL′ corrections in QCD
2020, 44(8): 083104. doi: 10.1088/16741137/44/8/083104We describe predictions for top quark pair differential distributions at hadron colliders, by combining the nexttonexttoleading order quantum chromodynamics calculations and nexttoleading order electroweak corrections with double resummation at the nexttonexttoleading logarithmic accuracy of threshold logarithms and smallmass logarithms. To the best of our knowledge, this is the first study to present such a combination, which incorporates all known perturbative information. Numerical results are presented for the invariantmass distribution, transversemomentum distribution, and rapidity distributions.
Just Accepted
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Thermodynamics in Rotating Antide Sitter Black Holes with Massive Scalar Field in Three Dimensions
Published: 20200807

Fast Heating Dissociation of
${ \Upsilon(1S) }$ in Heavy Ion Collisions at RHICPublished: 20200807 
Results of Dark Matter Search using the Full PandaXII Exposure
Published: 20200807
In Press
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Equation of state and chiral transition in softwall AdS/QCD with a more realistic gravitational background
Published: 20200811, doi: 10.1088/16741137/abab90Show AbstractWe construct an improved softwall AdS/QCD model with a cubic coupling term of the dilaton and the bulk scalar field. The background fields in this model are solved by the Einsteindilaton system with a nontrivial dilaton potential, which has been shown to reproduce the equation of state from the lattice QCD with two flavors. The chiral transition behaviors are investigated in the improved softwall AdS/QCD model with the solved gravitational background, and the crossover transition can be realized. Our study provides the possibility to address the deconfining and chiral phase transitions simultaneously in the bottomup holographic framework.

Studying the localized CP violation and the branching fraction of the
${\bar{B}^0\rightarrow K^\pi^+\pi^+\pi^}$ decayPublished: 20200811, doi: 10.1088/16741137/abac00Show AbstractIn this work, we study the localized$ CP $ violation and the branching fraction of the fourbody decay$ \bar{B}^0\rightarrow K^\pi^+\pi^\pi^+ $ by employing a quasitwobody QCD factorization approach. Considering the interference of$ \bar{B}^0\rightarrow \bar{K}_0^*(700)\rho^0(770)\rightarrow K^\pi^+\pi^\pi^+ $ and$ \bar{B}^0\rightarrow \bar{K}^*(892)f_0(500)\rightarrow K^\pi^+\pi^\pi^+ $ channels, we predict$ \mathcal{A_{CP}}(\bar{B}^0\rightarrow K^\pi^+\pi^\pi^+)\in [0.15,0.28] $ and$ {\cal{B}}(\bar{B}^0\rightarrow K^\pi^+\pi^\pi^+)\in[1.73,5.10]\times10^{7} $ , respectively, which shows that the interference mechanism of these two channels can induce the localized$ CP $ violation to this fourbody decay. Meanwhile, within the two quark model framework for the scalar mesons$ f_0(500) $ and$ \bar{K}_0^*(700) $ , we calculate the direct CP violations and branching fractions of the$ \bar{B}^0\rightarrow \bar{K}_0^*(700)\rho^0(770) $ and$ \bar{B}^0\rightarrow \bar{K}^*(892)f_0(500) $ decays, respectively. The corresponding results are$ \mathcal{A_{CP}}(\bar{B}^0\rightarrow \bar{K}_0^*(700)\rho^0(770)) \in [0.20, 0.36] $ ,$ \mathcal{A_{CP}}(\bar{B}^0\rightarrow \bar{K}^*(892)f_0(500))\in [0.08, 0.12] $ ,${\cal{B}} (\bar{B}^0\rightarrow \bar{K}_0^*(700) \rho^0(770)\in [6.76, 18.93]\times10^{8}$ and$ {\cal{B}} (\bar{B}^0\rightarrow \bar{K}^*(892)f_0(500))\in [2.66, 4.80]\times10^{6} $ , indicating that the$ CP $ violations of these twobody decays are both positive and the branching fractions quite different. These studies provide a new way to investigate the aforementioned fourbody decay and can be helpful in clarifying the configuration of the structure of the light scalar meson. 
A massless scalar field in RobertsonWalker spacetimes: Adiabatic regularization and Green’s function
Published: 20200811, doi: 10.1088/16741137/44/9/095104Show AbstractWe study adiabatic regularization of a coupling massless scalar field in general spatially flat RobertsonWalker (RW) spacetimes. For the conformal coupling, the 2ndorder regularized power spectrum and 4thorder regularized stress tensor are zero, and no trace anomaly exists in general RW spacetimes. This is a new result that exceeds those found in de Sitter space. For the minimal coupling, the regularized spectra are also zero in the radiationdominant and matterdominant stages, as well as in de Sitter space. The vanishing of these adiabatically regularized spectra is further confirmed by direct regularization of the Green's function. For a general coupling and general RW spacetimes, the regularized spectra can be negative under the conventional prescription. At a higher order of regularization, the spectra will generally become positive, but will also acquire IR divergence, which is inevitable for a massless field. To avoid the IR divergence, the insidehorizon regularization is applied. Through these procedures, nonnegative UV and IRconvergent power spectrum and spectral energy density will eventually be achieved.
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Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
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