211 research outputs found
Model-independent determination of the compositeness of near-threshold quasibound states
We study the compositeness of near-threshold states to clarify the internal
structure of exotic hadron candidates. Within the framework of effective field
theory, we extend the Weinberg's weak-binding relation to include the nearby
CDD (Castillejo-Dalitz-Dyson) pole contribution with the help of the Pade
approximant. Finally, using the extended relation, we conclude that the CDD
pole contribution to the Lambda(1405) baryon in the Kbar N amplitude is
negligible.Comment: 5 pages, Proceedings of the 14th International Conference on
Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016), July
25-30, 2016, Kyoto, Japa
Generalized weak-binding relations of compositeness in effective field theory
We study the compositeness of near-threshold states to investigate the
internal structure of exotic hadron candidates. Within the framework of
effective field theory, Weinberg's weak-binding relation is extended to more
general cases by easing several preconditions. First, by evaluating the
contribution from the decay channel, we obtain the generalized relation for
unstable quasibound states. Next, we generalize the relation to include the
nearby CDD (Castillejo-Dalitz-Dyson) pole contribution with the help of the
Pade approximant. The validity of the estimation with the generalized
weak-binding relations is examined by numerical calculations. The method to
systematically evaluate the error in the weak-binding relation is presented.
Finally, by applying the extended relation to Lambda(1405), f0(980) and
a0(980), we discuss their internal structure, in comparison with other
approaches.Comment: 46 pages, 12 figures, published versio
New insights into the nature of the and resonances away from the SU(3) limit
Starting from the SU(3) limit, we consider the nature of the dynamically
generated resonances , and as
the pion and kaon masses are tuned to their physical values. We show that the
accidental symmetry of the two octets due to the leading order
Weinberg-Tomozawa term is broken by the next-to-leading order terms. Most
interestingly, we observe an interchange of the two trajectories of the
and the away from the SU(3) limit at
next-to-leading order. This remarkable phenomenon can be investigated using
lattice QCD calculations that start from the SU(3) limit.Comment: 11 pages, 4 figure
Evidence of a p- bound state
The existence of a nucleon- (N-) bound state has been subject of
theoretical and experimental investigations for decades. In this letter a
re-analysis of the p- correlation measured at the LHC is presented, using
as input recent lattice calculations of the N- interaction in the spin
3/2 channel obtained by the HAL QCD collaboration. A constrained fit of the
experimental data allows to determine the spin 1/2 channel of the p-
interaction with evidence of the formation of a p- bound state. The
scattering length and effective range extracted from the spin 1/2 channel are
fm and
fm, respectively. The corresponding binding energy is estimated to be in the
range MeV. This is the first experimental evidence of a p-
bound state
Femtoscopic study of coupled-channel baryon-baryon interactions with
Particles and Nuclei International Conference - PANIC2021, 5 - 10 September, 2021, OnlineThe correlation functions of pΞ− and ΛΛ pairs from pp and pA collisions are studied in the coupled-channel framework using the NΞ-ΛΛ coupled-channel baryon-baryon potentials obtained in the lattice QCD calculation at almost physical quark masses. The pΞ− correlation function is calculated to be significantly enhanced from the pure Coulomb case, while the ΛΛ correlation function is slightly enhanced from that of the pure fermion quantum statistics. These features reflect the large and small scattering lengths in the pΞ− and ΛΛ channels in magnitude, and agree with the observed data by the ALICE collaboration. The agreement confirms the S = −2 baryon-baryon potentials from lattice QCD
- …