Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>We initiate the study of exotic Higgs decays to long-lived particles (LLPs) at proposed future lepton colliders, focusing on scenarios with displaced hadronic final states. Our analysis entails a realistic tracker-based search strategy involving the reconstruction of displaced secondary vertices and the imposition of selection cuts appropriate for eliminating the largest irreducible backgrounds. The projected sensitivity is broadly competitive with that of the LHC and potentially superior at lower LLP masses. In addition to forecasting branching ratio limits, which may be freely interpreted in a variety of model frameworks, we interpret our results in the parameter space of a Higgs portal Hidden Valley and various incarnations of neutral naturalness, illustrating the complementarity between direct searches for LLPs and precision Higgs coupling measurements at future lepton colliders.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this study, we explore the entanglement of free spin- <jats:inline-formula> <jats:tex-math><?CDATA $ \displaystyle\frac{1}{2} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_053102_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, spin-1, and spin-2 fields. We start with an example involving Majorana fields in 1+1 and 2+1 dimensions. Subsequently, we perform the Bogoliubov transformation and express the vacuum state with a particle pair state in the configuration space, which is used to calculate the entropy. This clearly demonstrates that the entanglement entropy originates from the particles across the boundary. Finally, we generalize this method to free spin-1 and spin-2 fields. These higher free massless spin fields have well-known complications owing to gauge redundancy. We deal with the redundancy by gauge-fixing in the light-cone gauge. We show that this gauge provides a natural tensor product structure in the Hilbert space, while surrendering explicit Lorentz invariance. We also use the Bogoliubov transformation to calculate the entropy. The area law emerges naturally by this method. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The observed hardening of the spectra of cosmic ray protons and helium nuclei is studied within the model of nonlinear diffusive shock acceleration of supernova remnants (SNRs). In this model, the injected particles with energies below the spectral " knee” are assumed to be described by two populations with different spectral indexes around 200 GeV. The high-energy population is dominated by the particles with energies above 200 GeV released upstream of the shock of SNR, and the low-energy population is attributed to the particles with energies below 200 GeV released downstream of the shock of SNR. In this scenario, the spectral hardening of cosmic ray protons and helium nuclei observed by PAMELA, AMS-02, and CREAM experiments can be reproduced.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The multi-layer computing model is developed to calculate wide-angle neutron spectra, in the range from 0° to 180° with a 5° step, produced by bombarding a thick beryllium target with deuterons. The double-differential cross-sections (DDCSs) for the <jats:sup>9</jats:sup>Be(d, xn) reaction are calculated using the TALYS-1.8 code. They are in agreement with the experimental data, and are much better than the PHITS-JQMD/GEM results at 15° , 30° , 45° and 60° neutron emission angles for deuteron energy of 10.0 MeV. In the TALYS-1.8 code, neutron contributions from direct reactions (break-up, stripping and knock-out reactions) are controlled by adjustable parameters, which describe the basic characteristics of typical direct reactions and control the relative intensity and the position of the ridgy hillock at the tail of DDCSs. It is found that the typical calculated wide-angle neutron spectra for different neutron emission angles and neutron angular distributions agree quite well with the experimental data for 13.5 MeV deuterons. The multi-layer computing model can reproduce the experimental data reasonably well by optimizing the adjustable parameters in the TALYS-1.8 code. Given the good agreement with the experimental data, the multi-layer computing model could provide better predictions of wide-angle neutron energy spectra, neutron angular distributions and neutron yields for the <jats:sup>9</jats:sup>Be(d, xn) reaction neutron source. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The proton and neutron cross-shell excitations across the <jats:italic>Z</jats:italic>= 50 shell are investigated in the southwest quadrant of <jats:sup>132</jats:sup>Sn by large-scale shell-model calculations with extended pairing and multipole-multipole force. The model space allows proton (neutron) core excitations, and both the low- and high-energy states for <jats:sup>130</jats:sup>In are well described, as found by comparison with the experimental data. The monopole effects between the proton orbit <jats:inline-formula> <jats:tex-math><?CDATA $ g_{9/2} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_054101_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and neutron orbit <jats:inline-formula> <jats:tex-math><?CDATA $ g_{7/2} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_054101_M5.jpg" xlink:type="simple" /> </jats:inline-formula> are studied as the new monopole correction that perfectly reproduces the first 1<jats:sup>+</jats:sup> level in <jats:sup>130</jats:sup>In. The energy interval of proton (neutron) core excitations in <jats:sup>130</jats:sup>In lies in the range of 4.5−6.5 (2.0−4.1) MeV, and the high energy yrast states are predicted as neutron core excitations. The <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_43_5_054101_M9.jpg" xlink:type="simple" /> </jats:inline-formula> decays are calculated among the <jats:italic>A</jats:italic>=130 nuclei of <jats:sup>130</jats:sup>In, <jats:sup>130</jats:sup>Sn and <jats:sup>130</jats:sup>Cd. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The constituent counting rule, determining the scaling behavior of the transition amplitudes in an exclusive process at high energies, is applied to probe the internal structure of the newly observed <jats:inline-formula> <jats:tex-math><?CDATA $d^*(2380)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_054102_M2.jpg" xlink:type="simple" /> </jats:inline-formula> resonance. Several selected exclusive processes at high energies for the production of <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_5_054102_M3.jpg" xlink:type="simple" /> </jats:inline-formula> are discussed. Results of two structural scenarios for <jats:inline-formula> <jats:tex-math><?CDATA $d^*(2380)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_054102_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, a hexaquark dominant compact system in the quark degrees of freedom, and a <jats:inline-formula> <jats:tex-math><?CDATA $\pi N\Delta$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_43_5_054102_M5.jpg" xlink:type="simple" /> </jats:inline-formula> three-body bound state in the hadronic degrees of freedom, are analyzed and compared. A rather remarkable difference between the results of these two scenarios for the mentioned processes are addressed. </jats:p>