Exotic dibaryons with a heavy antiquark

Yamaguchi, Yoshio; Yasui, Shigehiro

doi:10.1142/9789814618229_0041

Cited by 3 publications

(4 citation statements)

References 44 publications

(85 reference statements)

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“…5, we obtain bound and resonant states. 30 We perform the variational calculation where the wave function is expressed by the Gaussian expansion method. 31 For calculating the poles for resonances, we use the complex scaling method.…”

Section: Numerical Resultsmentioning

confidence: 99%

$\bar{D}$ and B nuclei with one pion exchange potential

Yamaguchi

Yasui

2014

Int. J. Mod. Phys. Conf. Ser.

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We discuss the possible existence of exotic dibaryons with a heavy antiquark, being realized three-body systems, [Formula: see text] and B(*)NN. These are genuinely exotic states with no quark-antiquark annihilation. We consider the heavy quark spin symmetry and chiral symmetry, and introduce the one pion exchange potential between a [Formula: see text] meson and a nucleon N. As for the NN interaction, we employ the Argonne [Formula: see text] potential. By solving the coupled-channel equations for PNN and [Formula: see text], we find bound and resonant states near the thresholds both in charm and bottom sectors.

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Section: Numerical Resultsmentioning

confidence: 99%

$\bar{D}$ and B nuclei with one pion exchange potential

Yamaguchi

Yasui

2014

Int. J. Mod. Phys. Conf. Ser.

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“…Note that the number of¯ is larger than that inD ( * ) and B mesons, because the number of light quarks in the exotic heavy baryons is larger. Recently,D ( * ) NN (B ( * ) NN) systems, anticharm (bottom) dibaryons, have been studied as exotic nuclei with minimal baryon numbers [78]. There, the bound states were found in 0 − in the isospin singlet sector, and the resonant states were also found in 1 − , leading to the degenerate states in the heavy-quark limit.…”

Section: Discussion Of Matrix Elements In Heavy Baryonsmentioning

confidence: 99%

“…There, the bound states were found in 0 − in the isospin singlet sector, and the resonant states were also found in 1 − , leading to the degenerate states in the heavy-quark limit. In those two states, the quantum number of the brown muck commonly contained was assigned as 1/2(1/2 + ) [78]. We obtained the matrix elements¯ , λ 1 , λ 2 (m c ), and λ 2 (m b ) as shown in Table III.…”

Section: Discussion Of Matrix Elements In Heavy Baryonsmentioning

confidence: 99%

Probing gluon dynamics by charm and bottom mesons in nuclear matter in heavy-meson effective theory with1/Mcorrections

Yasui

Sudoh

2014

Phys. Rev. C

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We consider heavy mesons with charm and bottom in nuclear medium. We construct an effective Lagrangian with axial-vector coupling including 1/M corrections for the heavy-meson mass M by following the velocityrearrangement invariance. As an application, we consider heavy mesons,D andD * mesons for charm and B and B * mesons for bottom, bound in nuclear matter, and we discuss their in-medium masses modified by the interaction with nucleons via pion exchanges including the 1/M corrections. The mass modifications are affected by the gluon dynamics in nuclear medium. By comparison with the heavy-quark effective theory, we find that the effects of scale anomaly are suppressed in nuclear medium. We also find that the contributions from the chromoelectric gluon are enhanced in nuclear medium, while those from the chromomagnetic gluon are reduced. We propose to use heavy mesons as probes to research the gluon fields in nuclear medium in experimental studies.

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“…Recently the three-body systemP ( * ) NN with baryon number two has been investigated, and has been shown to be the HQS doublet in the heavy quark mass limit [9]. There, the spin-complex (qNN from q fromP ( * ) and two nucleons NN) has the total spin and parity 1/2 + .…”

Section: Spin-complex In Nuclear Mattermentioning

confidence: 99%

Heavy hadron spectroscopy theory

Yasui¹

2014

Proceedings of XV International Conference on Hadron Spectroscopy — PoS(Hadron 2013)

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We discuss the multi-hadron systems containing a heavy hadron. We consider the heavy quark spin symmetry at leading order in the 1/m Q expansion with a heavy quark mass m Q . We discuss that there exist doublet/singlet states as degenerate/non-degenerate states in mass for any internal structure of the multi-hadron systems. As concrete examples, we adopt the heavy meson effective theory conserving the heavy quark spin, and apply it to the hadron moleculeP ( * )N composed of the heavy mesonP ( * ) = (Qq) spin 0(1) (a heavy antiquarkQ and a light quark q) and a nucleon N, which leads to the doublet state. We further show thatP ( * ) mesons are degenerate in mass in nuclear matter, and that the doublet state exists. Behind the mass degeneracy in the multihadron systems, a new structure called the spin-complex is proposed as a specific form of the brown muck. At next-to-leading order, we show that, in the heavy hadron mass formula, the terms conserving (breaking) the heavy quark spin symmetry are related to the interaction vertices of the chromoelectric (chromomagnetic) gluon and the heavy quark. By utilizing this property, we propose to use heavy hadrons as probes to investigate the modifications of the gluon fields in medium. Concretely, we perform the analysis of the in-medium masses ofP ( * ) meson in nuclear matter based on the heavy meson effective theory, and predict that the chromoelectric gluon is enhanced, while the chromomagnetic gluon is suppressed.

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Exotic dibaryons with a heavy antiquark

Cited by 3 publications

References 44 publications

$\bar{D}$ and B nuclei with one pion exchange potential

$\bar{D}$ and B nuclei with one pion exchange potential

Probing gluon dynamics by charm and bottom mesons in nuclear matter in heavy-meson effective theory with1/Mcorrections

Heavy hadron spectroscopy theory

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