Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session EL: QCD Theory I |
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Chair: Makoto Oka, Tokyo Tech & JAEA Room: Hilton Queen's 5 |
Thursday, October 25, 2018 7:00PM - 7:15PM |
EL.00001: Heavy quark spin multiplet structure of Pbar^{(*) } Σ_{Q}^{(*)} molecular states Yuki Shimizu, Yasuhiro Yamaguchi, Masayasu Harada We study the structure of heavy quark spin multiplets for heavy meson-baryon molecular states in a coupled system of $\bar{P}^{(*)}\Sigma_{Q}^{(*)}$, with constructing the one-pion exchange potential. We find that there are four(seven) types of HQS multiplets for S(P)-wave state classified by the structure of heavy quark spin and light cloud spin. The multiplets which have attractive potential are determined by the sign of the coupling constant for the heavy meson-pion interactions. Furthermore, the difference in the structure of light cloud spin gives the restrictions of the decay channel, which implies that the partial decay width has the information for the structure of HQS multiplets. |
Thursday, October 25, 2018 7:15PM - 7:30PM |
EL.00002: Short range πJ/ψ-DDbar* interaction by the quark exchange diagram Yasuhiro Yamaguchi, Yukihiro Abe, Kenji Fukukawa, Atsushi Hosaka Exotic hadrons reported in the heavy flavor sector have been one of the interesting topics in hadron and nuclear physics. Especially near the thresholds, the appearance of the hadron-hadron bound states, called hadronic molecules, is expected. On the other hand, an existence of thresholds induces the cusp structure which may be misinterpreted as a physical resonance. |
Thursday, October 25, 2018 7:30PM - 7:45PM |
EL.00003: Effects of attractive KK^bar and repulsive KK interactions in KKK^bar three-body resonance Kento Hara, Shoji Shinmura Using the complex scaling method, we discuss the properties of the coupled-channel KKK^bar-Kpipi three-body resonance. This resonance can be interpreted as K(1460) resonance. Our model can explain not only its mass but also its large width by introducing the Kpipi channel and repulsive KK interaction. The relativistic kinematics is also essential. We will discuss the structure of the three-body resonance based on the strongly attractive KK^bar interactions and repulsive KK interactions. |
Thursday, October 25, 2018 7:45PM - 8:00PM |
EL.00004: Kbar Dbar N molecular state as a “uudscbar pentaquark" in a three-body calculation Junko Yamagata-Sekihara, Takayasu Sekihara Kbar, anti-charm meson Dbar, and nucleon N in total isospin 1/2. This state behaves like an explicit pentaquark state because its minimal quark configuration is u u d s cbar. The Kbar Dbar N system is bound by the three kinds of attraction: the strong Kbar N attraction which generates Lambda(1405), Kbar Dbar attraction which generates Ds0(2317)^-, and weak Dbar N attraction. In this contribution, by employing a simple three-body potential model, we show that the system can be bound and discuss properties of the Kbar Dbar N bound state. |
Thursday, October 25, 2018 8:00PM - 8:15PM |
EL.00005: Large-Nc Relationships Among Two-Derivative Pionless EFT Couplings Roxanne Patricia Springer, Matthias R Schindler, Hershdeep Singh As the number of colors (Nc) becomes large, QCD develops an additional symmetry. This symmetry can be used to relate otherwise unknown low-energy constants (LECs) in effective field theories (EFTs) of QCD. Corrections to the large-Nc limit are perturbative in 1/Nc. We have used this large-Nc symmetry to make predictions for low-energy few-body parity-violation experiments, but sufficient data does not yet exist to test these predictions. Here we consider higher order (two derivative) large-Nc relationships and test them against existing parity-conserving two-nucleon scattering data. We find agreement, but also note subtleties involving subtraction-point dependence when the LECs themselves are not observables. This subtraction point-dependence is a typical feature of EFT LECs. |
Thursday, October 25, 2018 8:15PM - 8:30PM |
EL.00006: Hadronic Paschen-Back effect in P-wave charmonia under strong magnetic fields Sachio Iwasaki, Makoto Oka, Kei Suzuki, Tetsuya Yoshida
QCD dynamics under a strong magnetic field is of great interest to the field of relativistic heavy-ion collisions and magnetars. In this talk, I will discuss a new effect we recently found in Ref.[1], 'Hadronic Paschen-Back effect (HPBE)', which is analogous to the Paschen-Back effect observed in atomic physics. This effect is induced by the interplay between a strong magnetic field and finite orbital angular momenta in hadronic systems. It allows the wave functions to drastically deform and leads to anisotropic decays. Such a decay gives a possibility to measure the strength of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has not experimentally been measured. As an example of HPBE, I will report our results [1] of the mass spectra, wave functions, and mixing rates of P-wave charmonia in a wide range of magnetic fields by using the potential model and a numerical few-body technique. Furthermore, I will talk about a systematic study for the radiative decays of P-wave quarkonia by HPBE based on potential non-relativistic QCD in Ref.[2]. [1] arXiv:1802.04971 [2] arXiv:1805.09787 |
Thursday, October 25, 2018 8:30PM - 8:45PM |
EL.00007: Exact vector channel sum rules at finite temperature Philipp Gubler, Daisuke Satow The thermal behavior of the spectral function of the electromagnetic current plays an important |
Thursday, October 25, 2018 8:45PM - 9:00PM |
EL.00008: Analysis of the deconfinement transition using persistent homology Takehiro Hirakida, Kouji Kashiwa, Junpei Sugano, Junichi Takahashi, Hiroaki Kouno, Masanobu Yahiro In low temperature region, quarks are confined in hadrons, while they behave like free particles in high temperature. This is called deconfinement phase transition. In quenched QCD, Polyakov loop is the order parameter of the deconfinement phase transition. However, considering QCD with dynamical quarks, we cannot define this as a strictly order parameter. Then, we applied analysis based on "persistent homology" to Polyakov loop and investigated deconfinement phase transition in the effective Polyakov-line model. |
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