Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>The LHAASO-WFCTA experiment, which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique, uses a new generation of high-performance telescopes. To ensure that the experiment has excellent detection capability associated with the measurement of the energy spectrum, the primary composition of cosmic rays, and so on, an accurate geometrical reconstruction of air-shower events is fundamental. This paper describes the development and testing of geometrical reconstruction for stereo viewed events using the WFCTA (Wide Field of view Cherenkov/Fluorescence Telescope Array) detectors. Two approaches, which take full advantage of the WFCTA detectors, are investigated. One is the stereo-angular method, which uses the pointing of triggered SiPMs in the shower trajectory, and the other is the stereo-timing method, which uses the triggering time of the fired SiPMs. The results show that both methods have good geometrical resolution; the resolution of the stereo-timing method is slightly better than the stereo-angular method because the resolution of the latter is slightly limited by the shower track length.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>This work suggests a new model for anisotropic compact stars with quintessence in <jats:inline-formula> <jats:tex-math><?CDATA $f(T)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M2.jpg" xlink:type="simple" /> </jats:inline-formula> gravity by using the off-diagonal tetrad and the power-law as <jats:inline-formula> <jats:tex-math><?CDATA $f(T)=\beta T^n$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, where <jats:italic>T</jats:italic> is the scalar torsion and <jats:inline-formula> <jats:tex-math><?CDATA $\beta$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M5.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:italic>n</jats:italic> are real constants. The acquired field equations incorporating the anisotropic matter source along with the quintessence field, in <jats:inline-formula> <jats:tex-math><?CDATA $f(T)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M7.jpg" xlink:type="simple" /> </jats:inline-formula> gravity, are investigated by making use of the specific character of the scalar torsion <jats:italic>T</jats:italic> for the observed stars <jats:inline-formula> <jats:tex-math><?CDATA ${\rm{PSRJ1614}}-2230$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M9.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $4U 1608-52$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M10.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA ${\rm{Cen}} X-3$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M11.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA ${\rm{EXO1785}}-248$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M12.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $SMC X-1$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045102_M13.jpg" xlink:type="simple" /> </jats:inline-formula>. It is suggested that all the stellar structures under examination are advantageously independent of any central singularity and are stable. Comprehensive graphical analysis shows that various physical features which are crucially important for the emergence of the stellar structures are conferred. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this paper, we study three scalar fields, namely the quintessence, phantom, and tachyon fields, to explore the source of dark energy via the Gaussian processes method from the background and perturbation growth rate data. The corresponding reconstructions suggest that the dark energy should be dynamical. Moreover, the quintom field, which is a combination of the quintessence and phantom fields, is powerfully favored by the reconstruction. The mean values indicate that the potential <jats:inline-formula> <jats:tex-math><?CDATA $ V(\phi) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045103_M1.jpg" xlink:type="simple" /> </jats:inline-formula> in the quintessence field is a double exponential function, whereas <jats:inline-formula> <jats:tex-math><?CDATA $ V(\phi) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045103_M2.jpg" xlink:type="simple" /> </jats:inline-formula> in the phantom field is a double Gaussian function. This reconstruction can provide an important reference for the scalar field study. The two types of data employed reveal that the tachyon field is disadvantageous for describing the cosmic acceleration. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this paper, we study the dynamics of k-essence in loop quantum cosmology (LQC). The study indicates that the loop quantum gravity (LQG) effect plays a key role only in the early epoch of the universe and is diluted in the later stages. The fixed points in LQC are basically consistent with those in standard Friedmann-Robertson-Walker (FRW) cosmology. For most of the attractor solutions, the stability conditions in LQC are in agreement with those for the standard FRW universe. For some special fixed points, however, tighter constraints are imposed thanks to the LQG effect.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In four-dimensional Einstein-Gauss-Bonnet (EGB) gravity, we consider the thermodynamic and phase transitions of (charged) AdS black holes. For the negative GB coefficient <jats:inline-formula> <jats:tex-math><?CDATA $ \alpha \lt 0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045105_M1.jpg" xlink:type="simple" /> </jats:inline-formula>, the system allows two physical critical points, corresponding to the reentrant phase transition, when the charge <jats:inline-formula> <jats:tex-math><?CDATA $ Q\gt 2\sqrt{-\alpha} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045105_M2.jpg" xlink:type="simple" /> </jats:inline-formula>. For arbitrary <jats:inline-formula> <jats:tex-math><?CDATA $ \alpha\gt 0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_4_045105_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, the system always leads to a van der Waals phase transition. We then study the quasinormal modes (QNMs) of massless scalar perturbations to probe the van der Waals-like phase transition between small and large black holes (SBH/LBH) for (charged) AdS black holes. We find that the signature of this SBH/LBH phase transition in the isobaric process can be detected since the slopes of the QNM frequencies change dramatically in small and large black holes near the critical point. The obtained results further support that QNMs can be a dynamic probe of thermodynamic properties in black holes. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this work, we study the implications of Higgs precision measurements at future Higgs factories for the MSSM parameter space, focusing on the dominant stop sector contributions. We perform a multi-variable fit to both the signal strength for various Higgs decay channels at Higgs factories and the Higgs mass. The <jats:italic>χ</jats:italic> <jats:sup>2</jats:sup> fit results show sensitivity to <jats:italic>m<jats:sub>A</jats:sub> </jats:italic>, tan <jats:italic>β</jats:italic>, stop mass parameter <jats:italic>m</jats:italic> <jats:sub>SUSY</jats:sub> , and the stop left-right mixing parameter Xt. We also study the impact of the Higgs mass prediction on the MSSM and compare the sensitivities of different Higgs factories. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We investigate the parton distribution function (PDF) uncertainty in the measurement of the effective weak mixing angle <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M1.jpg" xlink:type="simple" /> </jats:inline-formula> at the CERN Large Hadron Collider (LHC). The PDF-induced uncertainty is large in proton-proton collisions at the LHC due to the dilution effect. The measurement of the Drell-Yan forward-backward asymmetry ( <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm FB}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M2.jpg" xlink:type="simple" /> </jats:inline-formula>) at the LHC can be used to reduce the PDF uncertainty in the <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M3.jpg" xlink:type="simple" /> </jats:inline-formula> measurement. However, when including the full mass range of lepton pairs in the <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm FB}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M4.jpg" xlink:type="simple" /> </jats:inline-formula> data analysis, the correlation between the PDF updating procedure and the <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M5.jpg" xlink:type="simple" /> </jats:inline-formula> extraction leads to a sizable bias in the obtained <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M6.jpg" xlink:type="simple" /> </jats:inline-formula> value. From our studies, we find that the bias can be significantly reduced by removing Drell-Yan events with invariant mass around the <jats:italic>Z-</jats:italic>pole region, while most of the sensitivity in reducing the PDF uncertainty remains. Furthermore, the lepton charge asymmetry in the <jats:italic>W</jats:italic> boson events as a function of the rapidity of the charged leptons, <jats:inline-formula> <jats:tex-math><?CDATA $A_\pm(\eta_\ell)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M7.jpg" xlink:type="simple" /> </jats:inline-formula>, is known to be another observable which can be used to reduce the PDF uncertainty in the <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M8.jpg" xlink:type="simple" /> </jats:inline-formula> measurement. The constraint from <jats:inline-formula> <jats:tex-math><?CDATA $A_\pm(\eta_\ell)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M9.jpg" xlink:type="simple" /> </jats:inline-formula> is complementary to that from <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm FB}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M10.jpg" xlink:type="simple" /> </jats:inline-formula>, and thus no bias affects the <jats:inline-formula> <jats:tex-math><?CDATA $\sin^2 \theta _{{\rm{eff}}}^{\ell}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053001_M11.jpg" xlink:type="simple" /> </jats:inline-formula> extraction. The studies are performed using the error PDF Updating Method Package (ePump), which is based on Hessian updating methods. In this article, the CT14HERA2 PDF set is used as an example. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Measuring the pionic structure function is of high interest, as it provides a new area for understanding the strong interaction among quarks and testing QCD predictions. To this end, we investigate the feasibility and expected impact of a possible experiment at EicC (Electron-ion collider in China). We show the simulation results on the statistical precision of an EicC measurement, based on the model of leading neutron tagged DIS process and the parton distribution functions of the pion from JAM18 global analysis. The simulation shows that at EicC, the kinematics cover the <jats:inline-formula> <jats:tex-math><?CDATA $x_{\pi}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M1.jpg" xlink:type="simple" /> </jats:inline-formula> range from 0.01 to 1, and the <jats:inline-formula> <jats:tex-math><?CDATA $Q^2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M2.jpg" xlink:type="simple" /> </jats:inline-formula> range from 1 to 50 GeV <jats:inline-formula> <jats:tex-math><?CDATA $^2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, within the acceptable statistical uncertainty. Assuming an integrated luminosity of 50 fb <jats:inline-formula> <jats:tex-math><?CDATA $^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M5.jpg" xlink:type="simple" /> </jats:inline-formula>, in the low- <jats:inline-formula> <jats:tex-math><?CDATA $Q^{2}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M6.jpg" xlink:type="simple" /> </jats:inline-formula> region ( <jats:inline-formula> <jats:tex-math><?CDATA $\lt 10$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M7.jpg" xlink:type="simple" /> </jats:inline-formula> GeV <jats:inline-formula> <jats:tex-math><?CDATA $^2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M8.jpg" xlink:type="simple" /> </jats:inline-formula>), the Monte Carlo data show that the suggested measurement in the whole <jats:inline-formula> <jats:tex-math><?CDATA $x_{\rm{\pi}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M9.jpg" xlink:type="simple" /> </jats:inline-formula> range reaches very high precision ( <jats:inline-formula> <jats:tex-math><?CDATA $\lt 3$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053002_M10.jpg" xlink:type="simple" /> </jats:inline-formula>%). To perform such an experiment, only the addition of a far-forward neutron calorimeter is needed. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We report a feasibility study for violation in <jats:inline-formula> <jats:tex-math><?CDATA $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M2.jpg" xlink:type="simple" /> </jats:inline-formula> decays at a Super Tau Charm Facility (STCF). With an expected luminosity of 1 ab <jats:inline-formula> <jats:tex-math><?CDATA $^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M3.jpg" xlink:type="simple" /> </jats:inline-formula> collected by STCF per year at a center-of-mass energy of 4.26 GeV, the statistical sensitivity for CP violation is determined to be of order <jats:inline-formula> <jats:tex-math><?CDATA $9.7\times10^{-4}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M5.jpg" xlink:type="simple" /> </jats:inline-formula> by measuring the decay-rate difference between <jats:inline-formula> <jats:tex-math><?CDATA $\tau^{+}\rightarrow K_{S}\pi^{+}\bar{\nu}_{\tau}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M6.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M7.jpg" xlink:type="simple" /> </jats:inline-formula>. The analysis is performed using a reliable fast simulation software package, which can describe the detector responses properly and vary the responses flexibly for further optimization. Moreover, the energy-dependent efficiencies for reconstructing <jats:inline-formula> <jats:tex-math><?CDATA $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M8.jpg" xlink:type="simple" /> </jats:inline-formula> are presented. The expected CP sensitivity is proportional to <jats:inline-formula> <jats:tex-math><?CDATA $1/\sqrt{\cal{L}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M10.jpg" xlink:type="simple" /> </jats:inline-formula> in the energy region from 4.0 to 5.0 GeV. The sensitivity of CP violation is of order <jats:inline-formula> <jats:tex-math><?CDATA $3.1\times10^{-4}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M12.jpg" xlink:type="simple" /> </jats:inline-formula> with 10 ab <jats:inline-formula> <jats:tex-math><?CDATA $^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053003_M13.jpg" xlink:type="simple" /> </jats:inline-formula> integrated luminosity, which is equivalent to ten years' data taking in this energy region at STCF. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Applying the effective Lagrangian method, we study the flavor changing neutral current process <jats:inline-formula> <jats:tex-math><?CDATA $b\to s\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M3.jpg" xlink:type="simple" /> </jats:inline-formula> within the minimal supersymmetric extension of the Standard Model, where baryon and lepton numbers are local gauge symmetries. Constraints on the parameters are investigated numerically with the experimental data for the branching ratio of <jats:inline-formula> <jats:tex-math><?CDATA $\bar{B}\to X_s\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M4.jpg" xlink:type="simple" /> </jats:inline-formula>. Additionally, we present the corrections to direct CP-violation in <jats:inline-formula> <jats:tex-math><?CDATA $\bar{B}\rightarrow X_s\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M5.jpg" xlink:type="simple" /> </jats:inline-formula> and time-dependent CP-asymmetry in <jats:inline-formula> <jats:tex-math><?CDATA $B\rightarrow K^*\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M6.jpg" xlink:type="simple" /> </jats:inline-formula>. With appropriate assumptions on the parameters, we find the direct CP-violation <jats:inline-formula> <jats:tex-math><?CDATA $A_{\rm CP}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M7.jpg" xlink:type="simple" /> </jats:inline-formula> is very small, while one-loop contributions to <jats:inline-formula> <jats:tex-math><?CDATA $S_{K^*\gamma}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_5_053101_M8.jpg" xlink:type="simple" /> </jats:inline-formula> can be significant. </jats:p>