Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>In this paper, we compute the relativistic corrections of the fragmentation functions (FFs) for a heavy quark to <jats:italic>B<jats:sub>c</jats:sub> </jats:italic> and <jats:inline-formula> <jats:tex-math><?CDATA $ B_c^* $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083101_JY0.jpg" xlink:type="simple" /> </jats:inline-formula> within the framework of non-relativistic QCD (NRQCD) factorization. The non-singlet and singlet DGLAP evolutions are also presented. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>A hypergeometric function is proposed to calculate the scalar integrals of Feynman diagrams. In this study, we verify the equivalence between the Feynman parametrization and the hypergeometric technique for the scalar integral of the three-loop vacuum diagram with four propagators. The result can be described in terms of generalized hypergeometric functions of triple variables. Based on the triple hypergeometric functions, we establish the systems of homogeneous linear partial differential equations (PDEs) satisfied by the scalar integral of three-loop vacuum diagram with four propagators. The continuation of the scalar integral from its convergent regions to entire kinematic domains can be achieved numerically through homogeneous linear PDEs by applying the element method.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In past years, several hints of lepton flavor universality (LFU) violation have emerged from the <jats:inline-formula> <jats:tex-math><?CDATA $ b \to c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M2.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ b \to s \ell^+ \ell^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M3.jpg" xlink:type="simple" /> </jats:inline-formula> data. More recently, the Belle Collaboration has reported the first measurement of the <jats:inline-formula> <jats:tex-math><?CDATA $ D^* $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M4.jpg" xlink:type="simple" /> </jats:inline-formula> longitudinal polarization fraction in the <jats:inline-formula> <jats:tex-math><?CDATA $ B \to D^* \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M5.jpg" xlink:type="simple" /> </jats:inline-formula> decay. Motivated by this intriguing result, along with the recent measurements of <jats:inline-formula> <jats:tex-math><?CDATA $ R_{J/\psi} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M6.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \tau $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M7.jpg" xlink:type="simple" /> </jats:inline-formula> polarization, we present the study of <jats:inline-formula> <jats:tex-math><?CDATA $ b \to c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M8.jpg" xlink:type="simple" /> </jats:inline-formula> decays in supersymmetry (SUSY) with <jats:inline-formula> <jats:tex-math><?CDATA $ R $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M9.jpg" xlink:type="simple" /> </jats:inline-formula>-parity violation (RPV). We consider <jats:inline-formula> <jats:tex-math><?CDATA $ B \to D^{(*)} \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M10.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ B_c \to \eta_c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M11.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ B_c \to J/\psi \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M12.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_b \to \Lambda_c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M13.jpg" xlink:type="simple" /> </jats:inline-formula> modes and focus on the branching ratios, LFU ratios, forward-backward asymmetries, polarizations of daughter hadrons, and the <jats:inline-formula> <jats:tex-math><?CDATA $ \tau $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M14.jpg" xlink:type="simple" /> </jats:inline-formula> lepton. The RPV SUSY was capable of explaining the <jats:inline-formula> <jats:tex-math><?CDATA $ R_{D^{(*)}} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M15.jpg" xlink:type="simple" /> </jats:inline-formula> anomalies at the <jats:inline-formula> <jats:tex-math><?CDATA $ 2\sigma $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M16.jpg" xlink:type="simple" /> </jats:inline-formula> level, after taking into account various flavor constraints. In the allowed parameter space, the differential branching fractions and LFU ratios are largely enhanced by the SUSY effects, especially in the large dilepton invariant mass region. Moreover, a lower bound <jats:inline-formula> <jats:tex-math><?CDATA $ {\mathcal B}(B^+ \to K^+ \nu \bar\nu) \gt 7.37 \times $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083103_M17.jpg" xlink:type="simple" /> </jats:inline-formula> 10<jats:sup>−6</jats:sup> is obtained. These observables could provide testable signatures at the high-luminosity LHC and SuperKEKB, and correlate with direct searches for SUSY. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The process <jats:inline-formula> <jats:tex-math><?CDATA $ e^+e^-\to J/\psi +X $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M1.jpg" xlink:type="simple" /> </jats:inline-formula> with the center-of-mass (CM) energy in the range from 3.7 to 10.6 GeV is calculated up to the next-to-leading order (NLO) in quantum chromodynamics (QCD). At 10.6 GeV, the result is consistent with the experimental result from Belle. However, the predictions are much smaller than the background in the measurements at BESIII in the low CM energy range from 3.7 to 4.6 GeV. This indicates that the convergence of the QCD perturbative expansion becomes worse as the CM energy is closer to the inclusive <jats:inline-formula> <jats:tex-math><?CDATA $ J/\psi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M2.jpg" xlink:type="simple" /> </jats:inline-formula> production threshold. For a further study of the QCD mechanism of <jats:inline-formula> <jats:tex-math><?CDATA $ J/\psi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M3.jpg" xlink:type="simple" /> </jats:inline-formula> production in <jats:inline-formula> <jats:tex-math><?CDATA $ e^+e^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M4.jpg" xlink:type="simple" /> </jats:inline-formula> collisions with different CM energies, the initial state radiation effect of <jats:inline-formula> <jats:tex-math><?CDATA $ e^+e^-\to J/\psi+gg $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M5.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ e^+e^-\to J/\psi+c \bar{c} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M6.jpg" xlink:type="simple" /> </jats:inline-formula> are calculated in QCD NLO. The results are plotted and the number of events for different CM energy bins are provided for SuperKEKB. This provides a method to precisely test the validity of perturbative predictions for <jats:inline-formula> <jats:tex-math><?CDATA $ J/\psi $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083104_M7.jpg" xlink:type="simple" /> </jats:inline-formula> production in future measurements. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>During the past few years, signs of lepton flavor universality (LFU) violation have been observed in <jats:inline-formula> <jats:tex-math><?CDATA $ b \to c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M2.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ b \to s \ell^+ \ell^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M3.jpg" xlink:type="simple" /> </jats:inline-formula> transitions. Recently, the <jats:inline-formula> <jats:tex-math><?CDATA $ D^* $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ \tau $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M5.jpg" xlink:type="simple" /> </jats:inline-formula> polarization fractions <jats:inline-formula> <jats:tex-math><?CDATA $ P_L^{D^*} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M6.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ P_L^\tau $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M7.jpg" xlink:type="simple" /> </jats:inline-formula> in <jats:inline-formula> <jats:tex-math><?CDATA $ B \to D^* \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M8.jpg" xlink:type="simple" /> </jats:inline-formula> decay were likewise measured by the Belle collaboration. Motivated by these intriguing results, we revisit the <jats:inline-formula> <jats:tex-math><?CDATA $ R_{D^{(*)}} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M9.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ R_{K^{(*)}} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M10.jpg" xlink:type="simple" /> </jats:inline-formula> anomalies in a scalar leptoquark (LQ) model, where two scalar LQs, one of which is a <jats:inline-formula> <jats:tex-math><?CDATA $ SU(2)_L $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M11.jpg" xlink:type="simple" /> </jats:inline-formula> singlet and the other a <jats:inline-formula> <jats:tex-math><?CDATA $ SU(2)_L $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M12.jpg" xlink:type="simple" /> </jats:inline-formula> triplet, are introduced simultaneously. We consider five <jats:inline-formula> <jats:tex-math><?CDATA $ b \to c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M13.jpg" xlink:type="simple" /> </jats:inline-formula> mediated decays, <jats:inline-formula> <jats:tex-math><?CDATA $ B \to D^{(*)}\tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M14.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ B_c \to \eta_c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M15.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ B_c \to J/\psi \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M16.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $ \Lambda_b \to \Lambda_c \tau \bar\nu $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M17.jpg" xlink:type="simple" /> </jats:inline-formula>, and focus on the LQ effects on 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_43_8_083105_M18.jpg" xlink:type="simple" /> </jats:inline-formula> distributions of the branching fractions, LFU ratios, and various angular observables in these decays. Under the combined constraints of the available data on <jats:inline-formula> <jats:tex-math><?CDATA $ R_{D^{(*)}} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M19.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ R_{J/\psi} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M20.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ P_L^\tau(D^*) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M21.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $ P_L^{D^*} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083105_M22.jpg" xlink:type="simple" /> </jats:inline-formula>, we perform scans for the LQ couplings and make predictions for a number of observables. Numerically it is found that both the differential branching fractions and LFU ratios are largely enhanced by the LQ effects, with the latter expected to provide testable signatures at the SuperKEKB and High-Luminosity LHC experiments. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We investigate the static, spherically symmetric regular black hole solutions in the generalized Rastall gravity. In particular, the prescription of Rastall gravity implies that the present approach does not necessarily involve nonlinear electrodynamics. Subsequently, the resulting regular black hole solutions can be electrically and magnetically neutral. The general properties of the regular black hole solutions are explored. Moreover, specific solutions are derived and discussed, particularly regarding the parameter related to the degree of violation of the energy-momentum conservation in the Rastall theory.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>We give the Buchdahl stability bound in Eddington-inspired Born-Infeld (EiBI) gravity. We show that this bound depends on an energy condition controlled by the model parameter <jats:inline-formula> <jats:tex-math><?CDATA $\kappa$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083107_M1.jpg" xlink:type="simple" /> </jats:inline-formula>. From this bound, we can constrain <jats:inline-formula> <jats:tex-math><?CDATA $\kappa\lesssim 10^{8}\;{\rm{m}}^2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083107_M2.jpg" xlink:type="simple" /> </jats:inline-formula> if a neutron star with a mass around <jats:inline-formula> <jats:tex-math><?CDATA $3M_{\odot}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083107_M3.jpg" xlink:type="simple" /> </jats:inline-formula> is observed in the future. In addition, to avoid the potential pathologies in EiBI, a Hagedorn-like equation of state associated with <jats:inline-formula> <jats:tex-math><?CDATA $\kappa$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_083107_M4.jpg" xlink:type="simple" /> </jats:inline-formula> at the center of a compact star is inevitable, which is similar to the Hagedorn temperature in string theory. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>In the excitation of the resonant state followed by the sequential cluster-decay, the in-plane angular correlation method is usually employed to determine the spin of the mother nucleus. However, the correlation pattern exhibited in a two-dimensional angular-correlation spectrum depends on the selected coordinate system. In particular, the parity-symmetric and axial-symmetric processes should be presented in a way to enhance the correlation pattern, whereas the non-symmetric process should be plotted separately to reduce the background. In this study, three coordinate systems previously adopted for correlation patterns in the literature are described and compared to each other. The consistency among these systems is evaluated based on the experimental data analysis for the 10.29-MeV state in <jats:sup>18</jats:sup>O. A spin-parity of 4<jats:sup>+</jats:sup> is obtained for all three coordinate systems. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The collective rotations of the <jats:inline-formula> <jats:tex-math><?CDATA $ K^\pi = 5^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_084101_M1.jpg" xlink:type="simple" /> </jats:inline-formula> configuration in neutron-rich Mo, Ru and Pd isotopes were systematically investigated by the configuration-constrained cranking shell model based on the Skyrme Hartree-Fock method with pairing treated by shell-model diagonalization. The calculations efficiently reproduce the experimental moments of inertia of both the ground-state and side bands. Rotational bands built on two-particle <jats:inline-formula> <jats:tex-math><?CDATA $ K^\pi = 5^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_084101_M2.jpg" xlink:type="simple" /> </jats:inline-formula> configurations have been the subject of intense study. Possible configurations were assigned to the observed <jats:inline-formula> <jats:tex-math><?CDATA $ 5^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_084101_M3.jpg" xlink:type="simple" /> </jats:inline-formula> bands in <jats:sup>102-106</jats:sup>Mo, <jats:sup>108-112</jats:sup>Ru and <jats:sup>112-114</jats:sup>Pd. We predict the existence of the <jats:inline-formula> <jats:tex-math><?CDATA $ 5^- $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_084101_M7.jpg" xlink:type="simple" /> </jats:inline-formula> bands in <jats:sup>108,110</jats:sup>Mo. These results provide deep insights into the structure of neutron-rich nuclei, and provide useful information for future experiments. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We propose a novel self-consistent mean field approximation method by means of a Fierz transformation, taking the Nambu-Jona-Lasinio model as an example. This new self-consistent mean field approximation introduces a new free parameter <jats:italic>α</jats:italic> to be determined experimentally. When <jats:italic>α</jats:italic> assumes the value of 0.5, the approximation reduces to the mean field calculation commonly used in the past. Subsequently, we study the influence of the undetermined parameter <jats:italic>α</jats:italic> on the phase diagram of the two-flavor strong interaction matter. The value of <jats:italic>α</jats:italic> plays a crucial role in the strong interaction phase diagram, as it not only changes the position of the phase transition point of strong interaction matter, but also affects the order of the phase transition. For example, when <jats:italic>α</jats:italic> is greater than the critical value <jats:inline-formula> <jats:tex-math><?CDATA $ \alpha_c = 0.71$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_8_084102_M100.jpg" xlink:type="simple" /> </jats:inline-formula>, then the strong interaction matter phase diagram no longer has a critical end point. In addition, in the case of zero temperature and finite density, we found that when <jats:italic>α</jats:italic> &gt; 1.044, the pseudo-critical chemical potential corresponds to ~4–5 times the saturation density of the nuclear matter, which agrees with the expected results from the picture of the hadrons degree of freedom. The resulting equations of state of strong interaction matter at low temperatures and high densities will have an important impact on studies concerning the mass radius relationship of neutron stars and the merging process of binary neutron stars. </jats:p>