Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>We adopt a bottom-up Effective Field Theory (EFT) approach to derive a model-independent Veltman condition to cancel out the quadratic divergences in the Higgs mass. We show using the equivalence theorem that all the deviations in the Higgs couplings to the <jats:inline-formula> <jats:tex-math><?CDATA $ W $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013101_M1.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ Z $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013101_M2.jpg" xlink:type="simple" /> </jats:inline-formula> from the SM predictions should vanish. We argue based on tree-level unitarity that any new physics that naturally cancels out the quadratic divergences should be <jats:inline-formula> <jats:tex-math><?CDATA $ \lesssim 19 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013101_M3.jpg" xlink:type="simple" /> </jats:inline-formula> TeV. We show that the level of fine-tuning required is <jats:inline-formula> <jats:tex-math><?CDATA $ O(0.1\%-1\%) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013101_M4.jpg" xlink:type="simple" /> </jats:inline-formula> unless the UV sector has a symmetry that forces the satisfaction of the model-independent Veltman condition, in which case all fine-tuning is eliminated. We also conjecture that, if no new physics that couples to the Higgs is observed up to <jats:inline-formula> <jats:tex-math><?CDATA $ \sim 19 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013101_M5.jpg" xlink:type="simple" /> </jats:inline-formula> TeV, or if the Higgs couplings to the SM particles conform to the SM predictions, then the Higgs either does not couple to any UV sector or is fine-tuned. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Using an extended chromomagnetic model, we perform a systematic study of the masses of doubly heavy tetraquarks. We find that the ground states of the doubly heavy tetraquarks are dominated by the color-triplet <jats:inline-formula> <jats:tex-math><?CDATA $\left| {(qq)^{\bar{3}_{c}}(\bar{Q}\bar{Q})^{3_{c}}} \right\rangle $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M1.jpg" xlink:type="simple" /> </jats:inline-formula> configuration, which is opposite to that of fully heavy tetraquarks. The combined results suggest that the color-triplet configuration becomes more important when the mass difference between the quarks and antiquarks increases. We find three stable states that lie below the thresholds of two pseudoscalar mesons. They are the <jats:inline-formula> <jats:tex-math><?CDATA $IJ^{P}=01^{+}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M2.jpg" xlink:type="simple" /> </jats:inline-formula> <jats:inline-formula> <jats:tex-math><?CDATA $nn\bar{b}\bar{b}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M3.jpg" xlink:type="simple" /> </jats:inline-formula> tetraquark, <jats:inline-formula> <jats:tex-math><?CDATA $IJ^{P}=00^{+}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M4.jpg" xlink:type="simple" /> </jats:inline-formula> <jats:inline-formula> <jats:tex-math><?CDATA $nn\bar{c}\bar{b}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M5.jpg" xlink:type="simple" /> </jats:inline-formula> tetraquark, and <jats:inline-formula> <jats:tex-math><?CDATA $J^{P}=1^{+}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M6.jpg" xlink:type="simple" /> </jats:inline-formula> <jats:inline-formula> <jats:tex-math><?CDATA $ns\bar{b}\bar{b}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013102_M7.jpg" xlink:type="simple" /> </jats:inline-formula> tetraquark. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The Nambu–Jona-Lasinio (NJL) model is one of the most useful tools for studying non-perturbative strong interactions in matter. Because it is a nonrenormalizable model, the choice of regularization is a subtle issue. In this paper, we discuss one of the general issues regarding regularization in the NJL model, which is whether we need to use regularization for the thermal part by evaluating the quark chiral condensate and thermal properties in the two-flavor NJL model. The calculations in this work include three regularization schemes that contain both gauge covariant and invariant schemes. We found that, regardless of the regularization scheme we choose, it is necessary to use regularization for the thermal part when calculating physical quantities related to the chiral condensate and to not use regularization for the thermal part when calculating physical quantities related to the grand potential.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>The proposed Circular Electron Positron Collider (CEPC) with a center-of-mass energy <jats:inline-formula> <jats:tex-math><?CDATA $ \sqrt{s} = 240$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013104_M1.jpg" xlink:type="simple" /> </jats:inline-formula> GeV will primarily serve as a Higgs factory. Additionally, it will offer good opportunities to search for new physics phenomena at low energies, which can be challenging with hadron colliders; however, these discoveries are highly motivated by theoretical models developed to explain, e.g., the relic abundance of dark matter. This paper presents sensitivity studies for chargino pair production by considering scenarios for both a Bino-like and a Higgsino-like neutralino as the lightest supersymmetric particle and using a full Monte Carlo (MC) simulation. By assuming systematic uncertainties at the level of 5%, the CEPC has the ability to discover chargino pair production up to the kinematic limit of <jats:inline-formula> <jats:tex-math><?CDATA $ \sqrt{s}/2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013104_M2.jpg" xlink:type="simple" /> </jats:inline-formula> for both scenarios. The results have a minor dependence on the reconstruction model and detector geometry. These results can also be considered as a reference and benchmark for similar searches at other proposed electron-positron colliders, such as the Future Circular Collider ee (FCC-ee) or the International Linear Collider (ILC), given the similar nature of the facilities, detectors, center-of-mass energies, and target luminosities. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Clear windows onto emergent hadron mass (EHM) and modulations thereof by Higgs boson interactions are provided by observable measures of pion and kaon structure, many of which are accessible via generalised parton distributions (GPDs). Beginning with algebraic GPD <jats:italic>Ansätze</jats:italic>, constrained entirely by hadron-scale <jats:inline-formula> <jats:tex-math><?CDATA $\pi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013105_M1.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:italic>K</jats:italic> valence-parton distribution functions (DFs), in whose forms both EHM and Higgs boson influences are manifest, numerous illustrations are provided. They include the properties of electromagnetic form factors, impact parameter space GPDs, gravitational form factors and associated pressure profiles, and the character and consequences of all-orders evolution. The analyses predict that mass-squared gravitational form factors are stiffer than electromagnetic form factors; reveal that <jats:italic>K</jats:italic> pressure profiles are tighter than <jats:inline-formula> <jats:tex-math><?CDATA $\pi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013105_M2.jpg" xlink:type="simple" /> </jats:inline-formula> profiles, with both mesons sustaining near-core pressures at magnitudes similar to that expected at the core of neutron stars; deliver parameter-free predictions for <jats:inline-formula> <jats:tex-math><?CDATA $\pi$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013105_M3.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:italic>K</jats:italic> valence, glue, and sea GPDs at the resolving scale <jats:inline-formula> <jats:tex-math><?CDATA $\zeta=2\,$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_013105_M4.jpg" xlink:type="simple" /> </jats:inline-formula> GeV; and predict that at this scale the fraction of meson mass-squared carried by glue and sea combined matches that lodged with the valence degrees-of-freedom, with a similar statement holding for mass-squared radii. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The photoneutron reaction <jats:inline-formula> <jats:tex-math><?CDATA $^{181}{\rm{Ta}}(\gamma,3{n})^{178{\rm{m,g}}}{\rm{Ta}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M1.jpg" xlink:type="simple" /> </jats:inline-formula> was investigated with the beam from the NSC KIPT electron linear accelerator LUE-40. The measurements were performed using the residual <jats:italic>γ</jats:italic>-activity method. The bremsstrahlung flux-averaged cross-sections <jats:inline-formula> <jats:tex-math><?CDATA $\langle{\sigma(E_{\rm{\gamma max}})}\rangle$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $\langle{\sigma(E_{\rm{\gamma max}})}\rangle_{\rm{m}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $\langle{\sigma(E_{\rm{\gamma max}})}\rangle_{\rm{g}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M4.jpg" xlink:type="simple" /> </jats:inline-formula> and the isomeric ratio of the reaction products <jats:inline-formula> <jats:tex-math><?CDATA $d(E_{\rm{\gamma max}})$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M5.jpg" xlink:type="simple" /> </jats:inline-formula> were measured. The theoretical values of the averaged cross-sections and isomeric ratio were calculated using the partial cross-sections from the TALYS1.95 code for different level density models <jats:inline-formula> <jats:tex-math><?CDATA $LD$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M6.jpg" xlink:type="simple" /> </jats:inline-formula> 1-6. The obtained experimental <jats:inline-formula> <jats:tex-math><?CDATA $d(E_{\rm{\gamma max}})$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M7.jpg" xlink:type="simple" /> </jats:inline-formula> agree with the data in the literature, but differ from the theoretical values in absolute magnitude and the behavior of the energy dependence. A comparison of the determined averaged cross-sections with the calculated cross-sections showed the best agreement for the case of the <jats:inline-formula> <jats:tex-math><?CDATA $LD$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014001_M8.jpg" xlink:type="simple" /> </jats:inline-formula> 5 model. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Experimentally measured neutron activation cross sections are presented for the <jats:inline-formula> <jats:tex-math><?CDATA $^{65}{\rm{Cu}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M1.jpg" xlink:type="simple" /> </jats:inline-formula>(<jats:italic>n</jats:italic>,<jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $^{62m}{\rm{Cu}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $^{41}{\rm{K}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M3.jpg" xlink:type="simple" /> </jats:inline-formula>(<jats:italic>n</jats:italic>,<jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $^{38}{\rm{Cl}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $^{65}{\rm{Cu}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M5.jpg" xlink:type="simple" /> </jats:inline-formula>(<jats:italic>n</jats:italic>,<jats:italic>2n</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $^{64}{\rm{Cu}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M6.jpg" xlink:type="simple" /> </jats:inline-formula> reactions with detailed uncertainty propagation. The neutron cross sections were measured at an incident energy of 14.92 ± 0.02 MeV, and the neutrons were based on the <jats:italic>t</jats:italic>(<jats:italic>d</jats:italic>,<jats:italic>n</jats:italic>)<jats:italic>α</jats:italic> fusion reaction. The <jats:inline-formula> <jats:tex-math><?CDATA $^{27}{\rm{Al}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M7.jpg" xlink:type="simple" /> </jats:inline-formula>(<jats:italic>n</jats:italic>,<jats:italic>α</jats:italic>) <jats:inline-formula> <jats:tex-math><?CDATA $^{24}{\rm{Na}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014002_M8.jpg" xlink:type="simple" /> </jats:inline-formula> reaction was used as a reference reaction for the normalization of the neutron flux. The pre-calibrated lead-shielded HPGe detector was used to detect the residues' <jats:italic>γ</jats:italic>-ray spectra. The data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database, theoretically calculated cross sections using the TALYS and EMPIRE codes, and evaluated nuclear data. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The elemental fragmentation cross sections of boron fragments produced by stable and neutron-rich <jats:sup>12-16</jats:sup>C beams with a carbon target were systematically measured at an incident beam energy of approximately 240 MeV/nucleon. The measured cross sections were found to increase as the projectile mass number increases. The observed feature is explained qualitatively based on the abrasion-ablation two-stage reaction model and is compared quantitatively with predictions from various reaction models, including empirical and statistical models. All models agree with the measured cross sections within a factor of 2. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Understanding the EMC effect and its relation to the short-range nucleon-nucleon correlations (SRC) in nuclei is a major challenge for modern nuclear physics. One of the key aspects of the connection between these phenomena is the universality. The universality states that the SRC is responsible for the EMC effect and that the modification of the partonic structure of the SRC is the same in different nuclei. The flavor dependence of the universality is one of the unanswered questions. The investigations conducted to date have demonstrated the existence and universality of the SRC for light <jats:inline-formula> <jats:tex-math><?CDATA $ u $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014004_M1.jpg" xlink:type="simple" /> </jats:inline-formula> and <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_46_1_014004_M2.jpg" xlink:type="simple" /> </jats:inline-formula> quarks. Recently, it was suggested that the universality for heavy flavors can be studied through their deep subthreshold production in <jats:inline-formula> <jats:tex-math><?CDATA $ \gamma A $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014004_M3.jpg" xlink:type="simple" /> </jats:inline-formula> and eA collisions. In this paper, we discuss an alternative possibility to access the strange and gluon high-<jats:italic>X</jats:italic> structure of the SRC and to establish universality for heavy flavors using nuclear semi-inclusive deep inelastic scattering (nSIDIS), which probes different quark flavor combinations depending on the final state hadron. The specific reaction can be "tagged" by observation of a strange or charmed particle registered in coincidence with the scattering lepton. The universality of the SRC can be tested in the kinematic region, i.e., <jats:inline-formula> <jats:tex-math><?CDATA $ X \gt, 1 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014004_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, where the contribution to the cross section from SRC becomes dominant. Exploring the strangeness, charmonium, and open charm will shed light on the role of quarks and gluons in nuclei, thereby developing an understanding of how nuclei emerge within QCD. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The chiral magnetic effect (CME) is a novel transport phenomenon, arising from the interplay between quantum anomalies and strong magnetic fields in chiral systems. In high-energy nuclear collisions, the CME may survive the expansion of the quark-gluon plasma fireball and be detected in experiments. Over the past two decades, experimental searches for the CME have attracted extensive interest at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). The main goal of this study is to investigate three pertinent experimental approaches: the <jats:inline-formula> <jats:tex-math><?CDATA $\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_46_1_014101_M1.jpg" xlink:type="simple" /> </jats:inline-formula> correlator, the <jats:italic>R</jats:italic> correlator, and the signed balance functions. We exploit simple Monte Carlo simulations and a realistic event generator (EBE-AVFD) to verify the equivalence of the core components among these methods and to ascertain their sensitivities to the CME signal and the background contributions for the isobar collisions at the RHIC. </jats:p>