Catálogo de publicaciones - revistas

<jats:title>Abstract</jats:title> <jats:p>We study the potential of the LHCb 13 TeV single <jats:italic>W</jats:italic> <jats:sup>±</jats:sup> and <jats:italic>Z</jats:italic> boson pseudo-data for constraining the parton distribution functions (PDFs) of the proton. As an example, we demonstrate the sensitivity of the LHCb 13 TeV data, collected with integrated luminosities of 5 <jats:inline-formula> <jats:tex-math><?CDATA $ {\rm{fb}}^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023110_M1.jpg" xlink:type="simple" /> </jats:inline-formula> and 300 <jats:inline-formula> <jats:tex-math><?CDATA $ {\rm{fb}}^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023110_M2.jpg" xlink:type="simple" /> </jats:inline-formula>, to reducing the PDF uncertainty bands of the CT14HERA2 PDFs, using the error PDF updating package EPUMP. The sensitivities of various experimental observables are compared. Generally, sizable reductions in PDF uncertainties can be observed in the 300 <jats:inline-formula> <jats:tex-math><?CDATA $ {\rm{fb}}^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023110_M3.jpg" xlink:type="simple" /> </jats:inline-formula> data sample, particularly in the small-<jats:italic>x</jats:italic> region. The double-differential cross section measurement of <jats:italic>Z</jats:italic> boson <jats:italic>p</jats:italic> <jats:sub>T</jats:sub> and rapidity can greatly reduce the uncertainty bands of <jats:italic>u</jats:italic> and <jats:italic>d</jats:italic> quarks in almost the whole <jats:italic>x</jats:italic> range, as compared to various single observable measurements. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>By applying the Error PDF Updating Method, we analyze the impact of the absolute and normalized single differential cross-sections for top-quark pair production data from the ATLAS and CMS experiments at the Large Hadron Collider, at a center-of-mass energy of <jats:inline-formula> <jats:tex-math><?CDATA $ \sqrt{s} = 8 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023111_M2.jpg" xlink:type="simple" /> </jats:inline-formula> TeV, on the CT14HERA2 PDFs. We find that the top quark pair single differential distributions provide minor constraints on the CT14HERA2 gluon PDF when the nominal CT14HERA2 inclusive jet production data are included in the fit. Larger constraints on the gluon distribution are present when the jet data are removed (CT14HERA2mJ) and/or when increased weights are given to the top data in the CT14HERA2 fits. The weighted <jats:inline-formula> <jats:tex-math><?CDATA $ t\bar t $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023111_M3.jpg" xlink:type="simple" /> </jats:inline-formula> data provide significant constraints on the CT14HERA2mJ gluon PDF, which are comparable to those obtained from inclusive jet production data. Furthermore, we examine the top quark mass sensitivity of the top-quark pair single differential distributions. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Inclusive <jats:inline-formula> <jats:tex-math><?CDATA $ \Upsilon(1S,2S,3S) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023112_M2.jpg" xlink:type="simple" /> </jats:inline-formula> photoproduction at the future Circular-Electron-Positron-Collider (CEPC) is studied, using the non-relativistic quantum chromodynamics (NRQCD) factorization formalism. Including the contributions from both direct and resolved photons, we present different distributions for the <jats:inline-formula> <jats:tex-math><?CDATA $ \Upsilon(1S,2S,3S) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023112_M3.jpg" xlink:type="simple" /> </jats:inline-formula> production. Our results suggest that there will be considerable events, implying that well measurements of the <jats:inline-formula> <jats:tex-math><?CDATA $ \Upsilon $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023112_M4.jpg" xlink:type="simple" /> </jats:inline-formula> photoproduction can be performed to further study heavy quarkonium physics at electron-positron colliders, in addition to hadron colliders. This supplemental study is very important for clarifying the current situation regarding the heavy quarkonium production mechanism. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>The next-to minimal supersymmetric standard model (NMSSM) with non-universal Higgs masses, i.e., the semi-constrained NMSSM (scNMSSM), extends the minimal supersymmetric standard model (MSSM) by a singlet superfield and assumes universal conditions, except for the Higgs sector. It can not only maintain the simplicity and grace of the fully constrained MSSM and NMSSM and relieve the tension they have been facing since the discovery of the 125-GeV Higgs boson but also allow for an exotic phenomenon wherein the Higgs decay into a pair of light ( <jats:inline-formula> <jats:tex-math><?CDATA $10\sim 60\;{\rm{GeV}}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023113_M1.jpg" xlink:type="simple" /> </jats:inline-formula>) singlet-dominated (pseudo)scalars (hereafter, in this paper, we use "scalar" for both scalars and pseudoscalars, considering pseudoscalars can also be called <jats:italic>CP</jats:italic>-odd scalars). This condition can be classified into three scenarios according to the identitiesof the SM-like Higgs and the light scalar: (i) the light scalar is <jats:italic>CP</jats:italic>-odd, and the SM-like Higgs is <jats:inline-formula> <jats:tex-math><?CDATA $h_2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023113_M2.jpg" xlink:type="simple" /> </jats:inline-formula>; (ii) the light scalar is <jats:italic>CP</jats:italic>-odd, and the SM-like Higgs is <jats:inline-formula> <jats:tex-math><?CDATA $h_1$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023113_M3.jpg" xlink:type="simple" /> </jats:inline-formula>; and (iii) the light scalar is <jats:italic>CP</jats:italic>-even, and the SM-like Higgs is <jats:inline-formula> <jats:tex-math><?CDATA $h_2$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023113_M4.jpg" xlink:type="simple" /> </jats:inline-formula>. In this work, we compare the three scenarios, checking the interesting parameter regions that lead to the scenarios, the mixing levels of the doublets and singlets, the tri-scalar coupling between the SM-like Higgs and a pair of light scalars, the branching ratio of Higgs decay to the light scalars, and sensitivities in the detection of the exotic decay at the HL-LHC and future lepton colliders such as CEPC, FCC-ee, and ILC. Finally, several interesting conclusions are drawn, which are useful for understanding the different delicate mechanisms of the exotic decay and designing colliders in future. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We study self-conjugate dark matter (DM) particles interacting primarily with Standard Model (SM) leptons in an effective field theoretical framework. We consider SM gauge-invariant effective contact interactions between Majorana fermion, real scalar and real vector DM with leptons by evaluating the Wilson coefficients appropriate for interaction terms up to dimension 8, and obtain constraints on the parameters of the theory from the observed relic density, indirect detection observations and from the DM-electron scattering cross-sections in direct detection experiments. Low energy LEP data has been used to study sensitivity in the pair production of low mass ( <jats:inline-formula> <jats:tex-math><?CDATA $ \leqslant$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023114_M1.jpg" xlink:type="simple" /> </jats:inline-formula> 80 GeV) DM particles. Pair production of DM particles of mass <jats:inline-formula> <jats:tex-math><?CDATA $\geqslant$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023114_M2.jpg" xlink:type="simple" /> </jats:inline-formula> 50 GeV in association with mono-photons at the proposed ILC has rich potential to probe such effective operators. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Various quantum theories of gravity predict the existence of a minimal measurable length. In this paper, we study effects of the minimal length on the motion of a particle in the Rindler space under a harmonic potential. This toy model captures key features of particle dynamics near a black hole horizon and allows us to make three observations. First, we find that chaotic behavior becomes stronger with increases in minimal length effects, leading predominantly to growth in the maximum Lyapunov characteristic exponents, while the KAM curves on Poincaré surfaces of a section tend to disintegrate into chaotic layers. Second, in the presence of the minimal length effects, it can take a finite amount of Rindler time for a particle to cross the Rindler horizon, which implies a shorter scrambling time of black holes. Finally, the model shows that some Lyapunov characteristic exponents can be greater than the surface gravity of the horizon, violating the recently conjectured universal upper bound. In short, our results reveal that quantum gravity effects may make black holes prone to more chaos and faster scrambling.</jats:p>

<jats:title>Abstract</jats:title> <jats:p>In this work we calculate the mass spectrum of strangeonium up to the <jats:inline-formula> <jats:tex-math><?CDATA $ 3D $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M1.jpg" xlink:type="simple" /> </jats:inline-formula> multiplet within a nonrelativistic linear potential quark model. Furthermore, using the obtained wave functions, we also evaluate the strong decays of the strangeonium states with the <jats:inline-formula> <jats:tex-math><?CDATA $ ^3P_0 $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M2.jpg" xlink:type="simple" /> </jats:inline-formula> model. Based on our successful explanations of the well established states <jats:inline-formula> <jats:tex-math><?CDATA $ \phi(1020) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ \phi(1680) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M4.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ h_1(1415) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M5.jpg" xlink:type="simple" /> </jats:inline-formula>, <jats:inline-formula> <jats:tex-math><?CDATA $ f'_2(1525) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M6.jpg" xlink:type="simple" /> </jats:inline-formula>, and <jats:inline-formula> <jats:tex-math><?CDATA $ \phi_3(1850) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M7.jpg" xlink:type="simple" /> </jats:inline-formula>, we further discuss the possible assignments of strangeonium-like states from experiments by combining our theoretical results with observations. It is found that some resonances, such as <jats:inline-formula> <jats:tex-math><?CDATA $ f_2(2010) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M8.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ f_2(2150) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M9.jpg" xlink:type="simple" /> </jats:inline-formula>, listed by the Particle Data Group, and <jats:inline-formula> <jats:tex-math><?CDATA $ X(2062) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M10.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $ X(2500) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M11.jpg" xlink:type="simple" /> </jats:inline-formula>, newly observed by BESIII, may be interpreted as strangeonium states. The possibility of <jats:inline-formula> <jats:tex-math><?CDATA $ \phi(2170) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M12.jpg" xlink:type="simple" /> </jats:inline-formula> as a candidate for <jats:inline-formula> <jats:tex-math><?CDATA $ \phi(3S) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M13.jpg" xlink:type="simple" /> </jats:inline-formula> or <jats:inline-formula> <jats:tex-math><?CDATA $ \phi(2D) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M14.jpg" xlink:type="simple" /> </jats:inline-formula> cannot be excluded. We expect our results to provide useful references for looking for the missing <jats:inline-formula> <jats:tex-math><?CDATA $ s\bar{s} $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023116_M15.jpg" xlink:type="simple" /> </jats:inline-formula> states in future experiments. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We propose a new dihedral angle observable for measuring the CP property of the interaction between the top quark and Higgs boson in <jats:inline-formula> <jats:tex-math><?CDATA $t\bar{t}H$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023117_M1.jpg" xlink:type="simple" /> </jats:inline-formula> production at the 14 TeV Large Hadron Collider (LHC). We consider two decay modes of the Higgs boson, <jats:inline-formula> <jats:tex-math><?CDATA $H\to b\bar{b}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023117_M2.jpg" xlink:type="simple" /> </jats:inline-formula> and <jats:inline-formula> <jats:tex-math><?CDATA $H\to \gamma\gamma$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023117_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, and demonstrate that the dihedral angle distribution is able to distinguish between the CP-even and the CP-odd hypothesis at a 95% confidence level, with an integrated luminosity of <jats:inline-formula> <jats:tex-math><?CDATA $\sim 180~{\rm{fb}}^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023117_M4.jpg" xlink:type="simple" /> </jats:inline-formula>. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>We present a SUSY model with four Higgs doublets of the "private type," in which all fermion types (up, down, and charged leptons) obtain their masses from a different Higgs doublet <jats:inline-formula> <jats:tex-math><?CDATA $H_f\,( f = u_1, d, e)$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M1.jpg" xlink:type="simple" /> </jats:inline-formula>. The conditions for anomaly cancellation imply that the remaining Higgs doublet of the model ( <jats:inline-formula> <jats:tex-math><?CDATA $H_{u_2}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M2.jpg" xlink:type="simple" /> </jats:inline-formula>) must have the same hypercharge as <jats:inline-formula> <jats:tex-math><?CDATA $H_{u_1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M3.jpg" xlink:type="simple" /> </jats:inline-formula>, and thus, can only couple to up-type quarks, which opens the possibility to have FCNCs only in this sector. We study the Lagrangian of the model, and in particular, the Higgs potential, to identify the Higgs mass-eigenstates and their interactions; for the Yukawa matrices, we consider the four-texture case. We obtain constraints on the model parameters by using LHC measurements on the properties of the 125 GeV Higgs boson (<jats:italic>h</jats:italic>), and identify viable regions of the parameter space. Subsequently, these constraints are used to evaluate the prospects for detecting the FCNC decay mode <jats:inline-formula> <jats:tex-math><?CDATA $t \to ch$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M4.jpg" xlink:type="simple" /> </jats:inline-formula> at the future high-luminosity (HL) option for the LHC, which are compared with current limits from LHC-run2. Moreover, we evaluate the FCNC decay of the next heavier Higgs boson <jats:inline-formula> <jats:tex-math><?CDATA $H_2\to tc$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M5.jpg" xlink:type="simple" /> </jats:inline-formula>, which can typically reach <jats:inline-formula> <jats:tex-math><?CDATA $BR(H_2 \rightarrow tc) \approx {\cal{O}}(10^{-4}-10^{-5} )$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023118_M6.jpg" xlink:type="simple" /> </jats:inline-formula>. The search for the signal at HL-LHC is also studied, and it is found that it may be detectable for specific regions of the model parameter space. </jats:p>

<jats:title>Abstract</jats:title> <jats:p>Using the light-cone QCD sum rules, we evaluate the magnetic moment of the <jats:inline-formula> <jats:tex-math><?CDATA $ P_c(4312) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023119_M1.jpg" xlink:type="simple" /> </jats:inline-formula> pentaquark state by considering both the <jats:inline-formula> <jats:tex-math><?CDATA $ \bar D\Sigma_c $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023119_M2.jpg" xlink:type="simple" /> </jats:inline-formula> molecular and diquark-diquark-antiquark state, with quantum numbers <jats:inline-formula> <jats:tex-math><?CDATA $J^P = \dfrac{1}{2}^-$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023119_M3.jpg" xlink:type="simple" /> </jats:inline-formula>. In the calculations, we use the diquark-diquark-antiquark and molecular form of the interpolating currents for the <jats:inline-formula> <jats:tex-math><?CDATA $ P_c(4312) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023119_M4.jpg" xlink:type="simple" /> </jats:inline-formula> pentaquark and the distribution amplitudes of the photon. The numerical results for the magnetic moment obtained using the two different pictures are quite different from each other, which can be used to pin down the underlying structure of <jats:inline-formula> <jats:tex-math><?CDATA $ P_c (4312) $?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_2_023119_M5.jpg" xlink:type="simple" /> </jats:inline-formula>. Any experimental measurement of the magnetic moment in the near future will provide an understanding of the internal structure of this pentaquark state. </jats:p>