Conveners
Parallel Session (A)
- Takatsugu Ishikawa
Parallel Session (A)
- Natsumi Ikeno
Parallel Session (A)
- Tomona Kinugawa (Tokyo Metropolitan University)
Parallel Session (A)
- Tetsuo Hyodo (Tokyo Metropolitan University)
Parallel Session (A)
- Daiki Suenaga (KMI, Nagoya University)
Hadrons are elementary excitations of the QCD vacuum and reflect its fundamental properties. A large fraction of their mass originates from chiral symmetry breaking, which is expected to be partially restored under high-temperature or high-density conditions. In such environments, the modification of hadron mass spectra is expected.
To investigate in-medium modifications of hadron masses,...
The spectral functions of chiral partners should become degenerate when the QCD chiral symmetry is restored. The axial-vector spectra are experimentally more challenging to construct than those of vector mesons that directly couple to virtual photons and then to dileptons.
Chiral mixing of the vector with axial-vector mesons is thus a key phenomenon to probe in-medium modifications of vector...
The possibility of observing mass and width modifications of phi mesons in dense matter is an important tool to better understand the behaviour of strongly interacting matter in extreme conditions. Here, I used a BUU transport approach to examine the mass modification of phi mesons and its consequences on the dilepton and kaon invariant mass spectra in several proton-induced reactions with Cu...
Recently, there has been active research on how the properties of the $\phi$ meson change in nuclear matter. Understanding the $\phi$-nucleon interaction is essential for clarifying the behavior of the $\phi$ meson in a nuclear environment. Also, the $\phi$-$N$ interaction is a unique hadronic system where quark exchange is forbidden at the first order, making gluon exchange the dominant...
Elucidating the mechanisms by which quarks and gluons are confined within hadrons is one of the most fundamental challenges in QCD. Addressing this problem requires an understanding of the role of non perturbative properties, such as chiral and gluon condensates, as well as the associated spontaneous and anomaly-induced symmetry breaking, in hadron formation. Recently, the stress distribution...
We study the electromagnetic and axial structure of the octet baryons in a nuclear medium in terms of the nuclear matter density $\rho$. The experimental information about the internal structure of baryons in nuclear medium is very scarce. Theoretical studies are then fundamental for the understanding of environments with dense nuclear matter, from the high energy nucleus-nucleus collisions to...
"In recent years, as experimental data on the excited states of Xi, Xi(1620) and Xi(1690), have been collected, theoretical analyses have also been actively conducted.
In our previous study, we have constructed theoretical models with the chiral unitary method based on the Belle and ALICE results [1-3].
In this work, we classify the eigenstates in order to investigate the physical origin...
Since most hadrons are unstable, we study nature of hadrons using complex potentials. In general, an eigenmomentum of the system is expressed as a pole of the scattering amplitude that is analyticaly continued to the complex momentum plane. Bound states are described by real potentials and their pole appears on the positive imaginary axis. By using complex potentials, we can describe unstable...
One of the most compelling topics in interaction studies in recent years is the investigation of the proton-deuteron (\textit{p-d}) system. This system is of particular interest because it involves interactions between three nucleons, as the deuteron is composed of both a proton and a neutron. Therefore, it serves as a valuable laboratory for exploring many-body physics. A widely used method...
One of the most effective techniques for investigating the mechanism of baryon production is the study of angular correlations between two particles. Angular correlations represent a convolution of various physical processes, such as mini-jets, Bose-Einstein quantum statistics, conservation of momentum, resonances, and other phenomena that contribute to the unique behavior observed for...
[based on Phys.Rev.D 110 (2024) 114052 ]
We discuss the relation between the Koonin-Pratt femtoscopic correlation function (CF) and invariant mass distributions from production experiments. We show that the equivalence is total for a zero source-size and that a Gaussian finite-size source provides a form-factor for the virtual production of the particles. Motivated by this remarkable...
The correlation function between deuteron and Xi particles produced in high-energy nuclear collisions has attracted attention as a quantity that provides information on the spatial distribution of these particles and the interaction between them. The two-baryon and three-baryon forces acting on subsystems of the three-baryon system are considered as possible interactions, but the role of the...
The photoproduction of π+π− pairs at forward angles has traditionally been attributed to Pomeron exchange. However, recent analyses of CLAS data at photon energies below 4 GeV reveal that for ∣t∣≳0.5 ~GeV^2, this mechanism alone fails to fully describe the observed angular moments. To address this, we develop a new theoretical model incorporating both two-pion and pion-nucleon resonant...
Until recently, it was widely believed that every hadron is a composite state of either three quarks or one quark and one antiquark. In the last 20 years, dozens of exotic heavy hadrons have been discovered, and yet no theoretical scheme has unveiled the general pattern. For hadrons that contain more than one heavy quark or antiquark, the Born-Oppenheimer approximation for QCD provides a...
Based on the recent findings of the pentaquark states and tetraquark states in the experiments, we exploit the coupled channel formalism to investigate the mass spectrum of these multiquark states. In our results, we explain the molecular nature for the Pc and Pcs states within the coupled channel interactions. Furthermore, we extrapolate our study to the meson systems with the strangeness,...
We study the properties of the hadron-hadron potentials and quark-antiquark potentials from the viewpoint of the channel coupling[1]. We introduce the effective hadron-hadron potential with coupled to the quark channel.
As an application, we construct a coupled-channel model of $c\bar{c}$ and $D\bar{D}$ to describe exotic hadron $X(3872)$[2].
To investigate the internal structure of the...
Motivated by recent advancements in tetraquark studies, we analyze the mass spectra and decay properties of singly bottom tetraquarks using the diquark-antidiquark formalism. By examining various internal quark configurations and color structures, we calculate the mass spectra within a non-relativistic framework. Additionally, several resonances are proposed as potential candidates for these...
