Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session D04: Minisymposium: Exotic Hadrons I |
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Chair: Elena Santopinto, INFN-Frascati Rome Room: Hilton Waikoloa Village Kings 2 |
Wednesday, November 29, 2023 9:00AM - 9:30AM |
D04.00001: Cusp spectroscopy: bound, virtual, or something else? Kiyoshi Tanida Near-threshold molecular-like state may appear as threshold cusp especially when the interaction is not strong enough so that a virtual state is formed instead of a bound state. In this talk, I report on experimental identification of a threshold cusp at Belle and some other related results. I also discuss future plans and possibilities at Belle II and J-PARC. |
Wednesday, November 29, 2023 9:30AM - 9:45AM |
D04.00002: Exotic vectors in the bottomonium region Wyatt A Smith, Alessandro Pilloni We discuss candidates for exotic hadrons in the heavy bottomonium region. We perform a coupled-channel N/D analysis of the exclusive and inclusive data of e+e- annihilation into open bottom at Belle. |
Wednesday, November 29, 2023 9:45AM - 10:00AM |
D04.00003: String-like confinement model for multi-quark systems applied to fully-charmed tetraquarks Makoto Oka, Guang-Juan Wang, Daisuke Jido Quark confinement mechanism in multi-quark systems is non-trivial because the color configuration in multiquark systems is not unique. It is important to identify the color basis to represent both a compact multi-quark state and two- (or multi-) hadron asymptotic states. We propose a new color basis system and confinement mechanism for the tetra-quark hadrons according to the string confinement picture of QCD. As a concrete example we take the fully-charmed tetraquark "cc c-bar c-bar" system, where a few resonant states were recently observed at the LHC experiments. |
Wednesday, November 29, 2023 10:00AM - 10:15AM |
D04.00004: On the Impact of the Quark Many-body Effects on Exotic Hadrons Sachiko Takeuchi, Makoto Takizawa, Yasuhiro Yamaguchi, Atsushi Hosaka The constituent quark models successfully explain the features of the single hadrons. The hadron interactions are also well-reproduced. For example, the channel dependence of the short-range part of two-baryon interaction corresponds to those given by the Lattice QCD. |
Wednesday, November 29, 2023 10:15AM - 10:30AM |
D04.00005: Structure of the bottomonium counterpart of X(3872) Makoto Takizawa, Sachiko Takeuchi, Yasuhiro Yamaguchi, Atsushi Hosaka The exotic hadron candidate X(3872) was observed in 2003 by Belle experiment. Although many experimental and theoretical studies have been conducted since the discovery of X(3872), the structure of X(3872) is still not completely understood. X(3872) has numerous interesting properties that have attracted the interest of many researchers. The paper on the discovery of X(3872) has over 2000 citations. X(3872) is thought to contain charm and anti-charm quark pairs as components. From the heavy flavor symmetry of QCD, Xb, a possible botmonium counterpart of X(3872), is believed to be present. We have studied the structure of X(3872) in the charmonimu and hadronic molecule hybrid model. We have studied the effect of the one-pion exchange interaction on BB*-B*B* system in the heavy hadron effective field theory. |
Wednesday, November 29, 2023 10:30AM - 10:45AM |
D04.00006: Compositeness of Tcc and X(3872) with decay and coupled-channel effects Tomona Kinugawa, Tetsuo Hyodo The compositeness is useful to quantitatively characterize the internal structure of states whether it is composite dominant (molecular dominant) or not. There have been many studies to analyze the internal structure of the exotic hadrons with the compositeness, in particular, for weakly bound states [1,2]. It is known that the near-threshold states are dominated by the molecular structure in the limit of the vanishing binding energy [3]. However, the decay and coupled-channel effects modify the compositeness as shown in Ref.[1], and therefore the composite nature of the near-threshold states with finite binding might be affected by these contributions. |
Wednesday, November 29, 2023 10:45AM - 11:00AM |
D04.00007: Dispersive analysis of the γγ→DD data and the confirmation of the DD bound state Igor Danilkin, Oleksandra Deineka, Marc Vanderhaeghen In my talk, I will present our recent data-driven analysis of the γγ→D+D− and γγ→D0D0 reactions from threshold up to 4.0 GeV in the DD invariant mass. For the S-wave contribution, we adopt a partial-wave dispersive representation, which is solved using the N/D ansatz. The left-hand cuts are accounted for using the model-independent conformal expansion. The D-wave χc2(3930) state is described as a Breit-Wigner resonance. The resulting fits are consistent with the data on the invariant mass distribution of the e+e−→J/ψDD process. Performing an analytic continuation to the complex s-plane, we find no evidence of a pole corresponding to the broad resonance X(3860) reported by the Belle Collaboration. Instead, we find a clear bound state below the DD threshold at 3695(4) MeV, confirming the previous phenomenological and lattice predictions. |
Wednesday, November 29, 2023 11:00AM - 11:15AM |
D04.00008: Weak decay of heavy hadrons based on the dynamical supersymmetry of anti s quark and ud diquark Harunobu Akiyama, Daisuke Jido, Leupold Stefan We focus on the symmetry of diquarks in order to study their properties in heavy hadrons. In particular, we focus on the ud good diquark which has spin-0 and color anti-triplet. Comparing ud diquarks and anti s quarks, they have masses of about 500 MeV and the same color structure. Therefore, following the SU(3) flavor symmetry, the ud diquark and the anti s quark are symmetric under strong interactions. This symmetry is a dynamical supersymmetry described by V(3) algebra. Adapting this to charm or bottom hadrons yields a degeneracy of {D+s , D+*s , Λc} or {anti B0s , anti B0*s , Λb}. By taking into account V(3) symmetry breaking and spin-spin interaction, mass formula for these hadron is obtained. |
Wednesday, November 29, 2023 11:15AM - 11:30AM |
D04.00009: Internal structure of Ω(2012) baryon in a coupled-channel approach Hideko Nagahiro, Qi-Fang Lyu, Atsushi Hosaka Recently, KEK/Belle has discovered the negative-party lowest excited state of the Omega baryon, Ω(2012), which contains three strange quarks. The standard quark model suggests that this is the first orbital P-wave excited state of a single strange quark. On the other hand, since the mass of Ω(2012) is close to the Ξ*Kbar threshold, it can also be interpreted as a meson-baryon molecule of Ξ*Kbar . Thus, despite being the lowest energy excited state, the internal structure of Ω(2012) is still poorly understood. |
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