Baryon interactions from lattice QCD with physical masses —S = −3 sector: Ξ∑ and Ξ∑-Λ∑—

Hyperon-nucleon and hyperon-hyperon interactions are important in studying the properties of hypernuclei in hypernuclear physics. However, unlike the nucleons which are quite stable, hyperons are unstable so that the direct scattering experiments are difficult, which leads to the large uncertainty in the phenomenological determination of hyperon potentials. In this talk, we use the gauge configurations generated at the (almost) physical point (mπ = 146 MeV) on a huge spatial volume (8:1fm)4 to present our latest result on the hyperon-hyperon potentials in S = −3 sector (Ξ∑ single channel and Ξ∑- ΞΛ; coupled channel) from the Nambu-Bethe-Salpeter wave functions based on the HAL QCD method with improved statistics.

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Neutron electric dipole moment using lattice QCD simulations at the physical point

Physical Review D ◽

10.1103/physrevd.103.054501 ◽

2021 ◽

Vol 103 (5) ◽

Author(s):

C. Alexandrou ◽

A. Athenodorou ◽

K. Hadjiyiannakou ◽

A. Todaro

Keyword(s):

Dipole Moment ◽

Lattice Qcd ◽

Electric Dipole Moment ◽

Electric Dipole ◽

Neutron Electric Dipole Moment ◽

Physical Point

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Coupled channel approach to hyperonic interactions from lattice QCD

Nuclear Physics A ◽

10.1016/j.nuclphysa.2013.06.003 ◽

2013 ◽

Vol 914 ◽

pp. 231-237 ◽

Cited By ~ 7

Author(s):

Kenji Sasaki

Keyword(s):

Lattice Qcd ◽

Coupled Channel

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Is two-pole’s $$\varLambda (1405)$$ one state or two?

The European Physical Journal C ◽

10.1140/epjc/s10052-021-09633-4 ◽

2021 ◽

Vol 81 (9) ◽

Author(s):

Zhong-Yu Wang ◽

Hiwa A. Ahmed ◽

C. W. Xiao

Keyword(s):

Single Channel ◽

Wave Functions ◽

Riemann Sheet ◽

Lower Mass ◽

Composite State ◽

Channel Interaction ◽

Quantum Numbers ◽

Coupled Channels ◽

Pole Structure

AbstractTo understand the nature of two poles for the $$\varLambda (1405)$$ Λ ( 1405 ) state, we revisit the interactions of $${\bar{K}}N$$ K ¯ N and $$\pi \Sigma $$ π Σ with their coupled channels, where two-pole structure is found in the second Riemann sheet. We also dynamically generate two poles in the single channel interaction of $${\bar{K}}N$$ K ¯ N and $$\pi \Sigma $$ π Σ , respectively. Moreover, we make a further study of two poles’ properties by evaluating the couplings, the compositeness, the wave functions, and the radii for the interactions of four coupled channels, two coupled channels and the single channel. Our results show that the nature of two poles is unique. The higher-mass pole is a pure $${\bar{K}} N$$ K ¯ N molecule, and the lower-mass one is a composite state of mainly $$\pi \Sigma $$ π Σ with tiny component $${\bar{K}} N$$ K ¯ N . From our results, one can conclude that the $$\varLambda (1405)$$ Λ ( 1405 ) state may be overlapped with two different states of the same quantum numbers.

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Charm quark system on the physical point in 2+1 flavor lattice QCD

10.22323/1.139.0132 ◽

2012 ◽

Cited By ~ 1

Author(s):

Yusuke Namekawa

Keyword(s):

Lattice Qcd ◽

Charm Quark ◽

Physical Point ◽

Quark System

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Quantum electrodynamics with self-conjugated equations with spinor wave functions for fermion fields

International Journal of Modern Physics A ◽

10.1142/s0217751x2150086x ◽

2021 ◽

pp. 2150086

Author(s):

V. P. Neznamov ◽

V. E. Shemarulin

Keyword(s):

Cross Sections ◽

Magnetic Moment ◽

Anomalous Magnetic Moment ◽

Quantum Electrodynamics ◽

Lamb Shift ◽

Wave Functions ◽

Self Energy ◽

Fermion Fields ◽

Spinor Wave

Quantum electrodynamics (QED) with self-conjugated equations with spinor wave functions for fermion fields is considered. In the low order of the perturbation theory, matrix elements of some of QED physical processes are calculated. The final results coincide with cross-sections calculated in the standard QED. The self-energy of an electron and amplitudes of processes associated with determination of the anomalous magnetic moment of an electron and Lamb shift are calculated. These results agree with the results in the standard QED. Distinctive feature of the developed theory is the fact that only states with positive energies are present in the intermediate virtual states in the calculations of the electron self-energy, anomalous magnetic moment of an electron and Lamb shift. Besides, in equations, masses of particles and antiparticles have the opposite signs.

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