The momentum correlation functions of S = -2 baryon pairs (p Xi^- and Lambda Lambda) produced in high-energy pp and pA collisions are investigated on the basis of the coupled-channel formalism. The strong interaction is described by the coupled-channel HAL QCD potential obtained by the lattice QCD simulations near physical quark masses, while the hadronic source function is taken to be a static Gaussian form. The coupled-channel effect, the threshold difference, the realistic strong interaction, and the Coulomb interaction are fully taken into account for the first time in the femtoscopic analysis of baryon-baryon correlations. The characteristic features of the experimental data for the p Xi^- and Lambda Lambda pairs at LHC are reproduced quantitatively with a suitable choice of non-femtoscopic parameters and the source size. The agreement between theory and experiment indicates that the N Xi (Lambda Lambda) interaction is moderately (weakly) attractive without having a quasi-bound (bound) state.
We investigate $DD^*$ and $D\bar{D}^*$ momentum correlations in high-energy collisions to elucidate the nature of $T_{cc}$ and $X(3872)$ exotic hadrons. Single range Gaussian potentials with the channel couplings to the isospin partners are constructed based on the empirical data. The momentum correlation functions of the $D^0D^{*+}$, $D^+D^{*0}$, $D^0\bar{D}^{*0}$, and $D^+D^{*-}$ pairs are computed with including the coupled-channel effects. We discuss how the nature of the exotic states are reflected in the behaviors of the correlation results.
We have conducted a study of the femtoscopic correlation functions for the $D^0D^{*+}$ and $D^+D^{*0}$ channels that build the $T_{cc}$ state. We develop a formalism that allows us to factorize the scattering amplitudes outside the integrals in the formulas, and the integrals involve the range of the strong interaction explicitly. For a source of size of 1 fm, we find values for the correlation functions of the $D^0 D^{*+}$ and $D^+D^{*0}$ channels at the origin around 30 and 2.5, respectively, and we see these observables converging to unity already for relative momenta of the order of 200 Me…
Exploring possible $^3_{Λ_c}\text{H}$ bound states through $pΛ_c$ femtoscopic correlations
Changzhou University of Information Technology（常州大学）；Nanjing Normal University（南京师范大学）；Nanjing University（南京大学）；Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所）
Spectroscopy and femtoscopic correlation function of the $B\bar{D}$, $B=(N, Δ)$ system in quark delocalization color screening model
School of Physics, Henan Normal University（河南师范大学物理学院）；School of Physics, Southeast University（东南大学物理学院）；Department of Physics, Nanjing Normal University（南京师范大学物理系）；Lanzhou Center for Theoretical Physics, Lanzhou University（兰州大学理论物理中心）
Off-shell Chiral Dynamics in the $Λ(1405)$ Resonance and $K^-p$ Femtoscopic Correlations
Beihang University（北京航空航天大学）；The University of Tokyo（东京大学）；Shenzhen University（深圳大学）；École Centrale de Pékin/School of General Engineering, Beihang University（北京航空航天大学高等工程学院）；Peng Huanwu Collaborative Center for Research and Education, Beihang University（北京航空航天大学彭桓武研究中心）；Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所南方核科学理论中心）
Revealing the nature of double-strangeness pentaquark states via femtoscopic correlation functions
School of Physics, Beihang University（北京航空航天大学物理学院）；Institute for Advanced Study in Nuclear Energy & Safety, College of Physics and Optoelectronic Engineering, Shenzhen University（深圳大学物理与光电工程学院核能与安全高等研究院）；Universidade de Sao Paulo, Instituto de Física（圣保罗大学物理研究所）；Universidade Federal de São Paulo（圣保罗联邦大学）；Peng Huanwu Collaborative Center for Research and Education, Beihang University（北京航空航天大学彭桓武教研中心）；Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所南方核科学理论中心）
Scattering and Femtoscopic Correlation Functions of the $Σ_c^{++}π^{+}$, $Σ_c^{0}π^{-}$ and $Σ_b^{+}π^{+}$ Systems
Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC（瓦伦西亚大学-西班牙国家研究委员会联合中心理论与物理研究所）；Instituto de Física Corpuscular (centro mixto CSIC-UV)（粒子物理研究所（CSIC-瓦伦西亚大学联合中心））；Institute of Space Sciences (ICE, CSIC)（空间科学研究所（ICE，CSIC））；Institut d’Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚空间研究院（IEEC））
In recent years the femtoscopy technique has been used by the ALICE Collaboration in small colliding systems at the LHC to investigate the strong-interaction of hadron pairs in the low-energy regime. The extension of this technique to the study of many-body correlations aims to deliver in the next years the first experimental measurements of the genuine many-hadron interactions, provided that the contributions due to the lower order terms are properly accounted for. In this paper we present a method that allows to determine the residual lower order contributions to the three-body correlation f…
We study the baryon-baryon interactions with strangeness $S = -2$ and corresponding momentum correlation functions in leading order covariant chiral effective field theory. The relevant low energy constants are determined by fitting to the latest HAL QCD simulations, taking into account all the coupled channels. Extrapolating the so-obtained strong interactions to the physical point and considering both quantum statistical effects and the Coulomb interaction, we calculate the $ΛΛ$ and $Ξ^-p$ correlation functions with a spherical Gaussian source and compare them with the recent experimental da…
$Λ_c N$ correlation functions with leading-order covariant chiral interactions
School of Physics, Beihang University（北京航空航天大学物理学院）；Research Center for Nuclear Physics (RCNP)（核物理研究中心）；Institute for Advanced Study in Nuclear Energy & Safety, College of Physics and Optoelectronic Engineering, Shenzhen University（深圳大学物理与光电工程学院核能与安全高等研究院）；Sino-French Carbon Neutrality Research Center, École Centrale de Pékin/School of General Engineering, Beihang University（北京航空航天大学中法碳中和研究中心/通用工程学院）；Peng Huanwu Collaborative Center for Research and Education, Beihang University（北京航空航天大学彭桓武科教协同中心）；Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所南方核科学理论中心）
From hyperon--nucleon interactions to deuteron--hyperon femtoscopy
Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Physics（黑森亥姆霍兹FAIR研究学院（HFHF），GSI重离子物理中心）；Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität（约翰·沃尔夫冈·歌德大学理论物理研究所）
Coulomb Effects in Momentum-Space Femtoscopy: A Case Study of the $\bar{K}Ω$ System
Universidad de Valencia-CSIC（瓦伦西亚大学-西班牙国家研究委员会）；IFIC, Centro Mixto Universidad de Valencia-CSIC（瓦伦西亚大学-西班牙国家研究委员会混合中心）；Instituto de Física Corpuscular, Centro Mixto Universidad de Valencia-CSIC（粒子物理研究所，瓦伦西亚大学-西班牙国家研究委员会混合中心）；Departamento de Física Teórica（理论物理系）；Istituto Nazionale di Fisica Nucleare（意大利国家核物理研究所）；Sezione di Catania（卡塔尼亚分部）；Università di Catania（卡塔尼亚大学）
We study the width of a two-body resonance in a coupled-channel system. We demonstrate how the width does not come only determined by the available phase space for its decay to the detection channel, but it greatly depends on the relative position of the mass of the resonance with respect to the masses of the coupled-channels generating the state. Our results are consistent with the experimental observation of narrow hadrons lying well above their lowest decay threshold.
A local coupled-channels Kbar N-pi Sigma-pi Lambda potential is constructed, equivalently reproducing the scattering amplitude in chiral SU(3) dynamics. By analyzing the wave function of the Lambda(1405), we show the Kbar N dominance of the upper pole within the two-pole structure of the Lambda(1405). The resulting potential will be useful for investigating Kbar few-nucleon systems including their coupled channels.
We demonstrate how an effective density of states can be derived from the S-matrix describing a coupled-channel system. Besides the locations of poles, the phase of the determinant of the S-matrix encodes essential details in characterizing the dynamics of resonant and non-resonant interactions. The density of states is computed for the two channel scattering problem ($ππ, K \bar{K}$, S-wave), and the influences from the various dynamical structures: poles, roots, branch cuts, and Riemann sheets, are examined.
Universidad de Valencia-CSIC（瓦伦西亚大学-西班牙国家科学研究委员会）；IFIC, Centro Mixto Universidad de Valencia-CSIC（瓦伦西亚大学-CSIC混合中心IFIC）；Instituto de Física Corpuscular, Centro Mixto Universidad de Valencia-CSIC（瓦伦西亚大学-CSIC混合中心粒子物理研究所）
本文提出相对论性动量空间框架计算耦合道飞米尺度关联函数，发现 $D\pi$ 和 $D^*\pi$ 系统理论结果与 ALICE 实验提取不一致，源于实验假设关联函数在高动量达到 1 的错误，需重新分析数据以确立飞米尺度关联函数为可靠定量工具。
The $\bar{K} N \rightarrow K Ξ$ reaction in coupled channel chiral models up to next-to-leading order
本文采用次领先阶的手征SU（3）拉格朗日量，在耦合道中实现么正化，研究了奇异度S=-1扇区中s波中的介子-重子相互作用.拉格朗日的参数已被安装到一个大的实验数据在不同的两体通道，特别注意的$\bar{K} N \rightarrow K Ξ$反应，这是特别敏感的非线性光学条款。为了改进$KΞ$产生通道中的模型，唯象地考虑了高自旋超子共振$Σ(2030)$和$Σ(2250)$的影响.
pi N --> eta N and eta N --> eta N partial wave T-matrices in a coupled, three channel model
在具有明显么正性的三耦合信道模型中，得到了八个最低分波的pi N -> eta N和eta N -> eta N分波T矩阵。两个物理通道是pi_N和eta_N，第三个通道pi_pi_N是一个有效的，但非物理的两体通道，代表所有剩余的进程。选择pi_N弹性相移和pi- p -> eta_n总截面和微分截面的加权数据库作为拟合过程的输入。一个模型包含一个单一的共振，在每一个占主导地位的三个分波的eta生产在较低的能量与以前的分析相比，基于类似的假设。一个多谐振耦合通道模型的引入，显着提高了与所有输入数据的协议。我们的研究结果进行了比较，与一个互补的多共振耦合通道的分析，约束与弹性和连续生产渠道。在1440 - 2200 MeV区域中包含第四P11共振进一步提高了分析与数据之间的一致性。
Two-particle momentum correlation functions as measured in heavy ion collisions or in high-energetic proton-proton collisions are studied. Special emphasis is put on systems like $ΛΛ$ or $K^-p$ where effects from the coupling to other channels could be relevant. In both cases other channels open at relatively low momenta or are already open at the reaction threshold. To have a solid basis, realistic coupled-channel interactions for $ΛΛ-ΞN-ΛΣ-ΣΣ$ and $πΛ-πΣ-\bar KN$ are utilized in the actual calculations. It is found that the opening of the $ΞN$ channel leaves a trace in the $ΛΛ$ correlation f…
We compare and review the theoretical predictions for the $\bar{K}N$ and $ηN$ elastic amplitudes where sizable variations are found among the considered approaches, especially at subthreshold energies relevant for studies of kaonic atoms and meson-nuclear quasi-bound states. Conditions for an appearance of dynamically generated states in meson-baryon multi-channel interactions are established and discussed for the $\bar{K}N$ and $ηN$ systems.
We give an overview of recent progress in the spectroscopic study of nucleon resonances within the dynamical coupled-channels analysis of meson-production reactions. The important role of multichannel reaction dynamics in understanding various properties of nucleon resonances is emphasized.
From dispersion relation approach, a formalism that describes final state interaction among three particles in a coupled-channel system is presented in this work. Different representations of coupled-channel three-body formalism with only spinless particles in both initial and final states are derived.
We consider a unitary coupled channel model to describe the low energy proton-antiproton scattering and the lower Coulomb-like protonium states. The existence of deeper quasi-bound states of nuclear nature is found to be a consequence of the experimental data. The properties of these states as well as the protonium annihilation densities are described and the difference with respect to the optical models description are manifested.
Coupled-channel dynamics for scattering and production processes in partial-wave amplitudes is discussed from a perspective that emphasizes unitarity and analyticity. We elaborate on several methods that have driven to important results in hadron physics, either by themselves or in conjunction with effective field theory. We also develop and compare with the use of the Lippmann-Schwinger equation in near-threshold scattering. The final(initial)-state interactions are discussed in detail for the elastic and coupled-channel case. Emphasis has been put in the derivation and discussion of the meth…
We demonstrate that partial wave amplitudes extracted from $D^+\to K^-π^+π^+$ Dalitz plot with a unitary coupled-channel model are significantly different from those obtained with an isobar model. The unitary coupled-channel model takes account of hadronic rescattering mechanisms involving all three mesons that have been missed in conventioanl isobar model analyses. The rescattering mechanisms contribute largely, and can triplicate the $D^+\to {K}^-π^+π^+$ decay width within our analysis. These findings deliver a warning that analysis results obtained with isobar models should be looked with a…
