926 citations · 10.4k across the 147 of their papers we have counts for
104 papers · 1 filter
Gravitational waves decay in vacuum
Diego Blas, José Antonio Oller
We show that gravitational waves (GW), treated as coherent graviton states, decay into photon pairs in vacuum. The process, even if suppressed by , is lifted by two effects co…
Pole properties of a resonance: When to subtract partial-decay widths to obtain the pole widths
J. A. Oller
When a resonance lies near the threshold of a heavier channel, an interesting feature can occur. The paradigmatic example employed here is the scalar isoscalar resonance…
Compositeness and several applications to exotic hadronic states with heavy quarks
J. A. Oller, Z. -H. Guo
Several methods for studying the nature of a resonance are applied to resonances recently discovered in the bottonomium and charmonium sectors. We employ the effective-range expans…
Axion-pion thermalization rate in unitarized NLO chiral perturbation theory
Luca Di Luzio, Jorge Martin Camalich, Guido Martinelli +2
We compute the axion-pion scattering , relevant for the axion thermalization rate in the early universe, within unitarized NLO chiral perturbation theory. The latter ext…
Axion-meson mixing in light of recent lattice - simulations and their two-photon couplings within chiral theory
Rui Gao, Zhi-Hui Guo, J. A. Oller +1
We study the mixing of the QCD/QCD-like axion and light-flavor mesons within the framework of chiral perturbation theory up to next-to-leading order in this wor…
Note on the definitions of branching ratios of overlapping resonances
V. Burkert, V. Crede, E. Klempt +8
Branching ratios for the decay of hadrons with large width or near thresholds depend on their definition. We test different definitions and show that rather different branching rat…
Analysis on the composite nature of the light scalar mesons and
Ze-Qiang Wang, Xian-Wei Kang, J. A. Oller +1
We study the weight or compositeness of the - and - in the composition of the and resonances, respectively. Either we use the satu…
Insights into the nature of the
Meng-Lin Du, Zhi-Hui Guo, J. A. Oller
We study the nature of the recently observed by the LHCb collaboration by employing three methods based on the elastic effective-range expansion and the resulting si…
Revisiting the nature of the pentaquarks
Meng-Lin Du, Vadim Baru, Feng-Kun Guo +4
The nature of the three narrow states, i.e., , and , is under intense discussion since their discovery from the updated analysis by LHCb. In…
Assessment of systematic theory uncertainties in IAM unitarization
Juan Escudero-Pedrosa, Felipe J. Llanes-Estrada, José Antonio Oller +1
Effective Field Theories (EFTs) for Goldstone Boson scattering at a low order allow the computation of near--threshold observables in terms of a few coefficients arranged by a coun…
A unified description of the hidden-charm tetraquark states , and
Zhi-Hui Guo, J. A. Oller
The newly observed hidden-charm tetraquark state , together with and , are studied in the combined theoretical framework of the effective range e…
Insights into the inner structures of the fully charmed tetraquark state
Zhi-Hui Guo, J. A. Oller
The recently discovered fully charmed tetraquark candidate is analyzed within the frameworks of effective-range expansion, compositeness relation and width saturation, an…
Systematizing and addressing theory uncertainties of unitarization with the Inverse Amplitude Method
Alexandre Salas-Bernárdez, Felipe J. Llanes-Estrada, Juan Escudero-Pedrosa +1
Effective Field Theories (EFTs) constructed as derivative expansions in powers of momentum, in the spirit of Chiral Perturbation Theory (ChPT), are a controllable approximation to…
Unitarization Technics in Hadron Physics with Historical Remarks
J. A. Oller
We review a series of unitarization techniques that have been used during the last decades, many of them in connection with the advent and development of current algebra and later…
Hyperon resonances and meson-baryon interactions in isospin 1
K. P. Khemchandani, A. Martinez Torres, J. A. Oller
In this work we extend our formalism to study meson-baryon interactions by including - and -channel diagrams for pseudoscalar-baryon systems. We study the coupled systems wit…
Nature of from the line shape
Xian-Wei Kang, J. A. Oller
Using a general parameterization of two-body scattering amplitude, we systematically analyze the corresponding data on , more explicitly, the CDF data on inclusive $p\bar{…
Interpretation of the LHCb States as Hadronic Molecules and Hints of a Narrow
Meng-Lin Du, Vadim Baru, Feng-Kun Guo +4
Three hidden-charm pentaquark states, , , and were revealed in the process measured by LHCb using both run I and run II…
Coupled-channel approach in hadron-hadron scattering
J. A. Oller
Coupled-channel dynamics for scattering and production processes in partial-wave amplitudes is discussed from a perspective that emphasizes unitarity and analyticity. We elaborate…
Investigation of radiative decays including final-state interactions
C. W. Xiao, U. -G. Meißner, J. A. Oller
We revisit the coupled channel interactions and dynamically generate the resonances and within both the isospin and the physical bases. The $f_0(98…
Anatomy of the newly observed hidden-charm pentaquark states: , and
Zhi-Hui Guo, J. A. Oller
We study the newly reported hidden-charm pentaquark candidates , and from the LHCb Collaboration, in the framework of the effective-range expansi…
Effective-range-expansion study of near threshold heavy-flavor resonances
Rui Gao, Zhi-Hui Guo, Xian-Wei Kang +1
In this work we study the resonances near the thresholds of the open heavy-flavor hadrons using the effective-range-expansion method. The unitarity, analyticity and compositeness c…
Towards a precise determination of the scattering amplitudes of the charmed and light-flavor pseudoscalar mesons
Zhi-Hui Guo, Liuming Liu, Ulf-G. Meissner +2
We study the scattering of the light-flavor pseudoscalar mesons () off the ground-state charmed mesons () within chiral effective field theory. The recent lattice s…
The exact discontinuity of a partial wave along the left-hand cut and the exact method in non-relativistic scattering
J. A. Oller, D. R. Entem
We first deduce the analytical continuation in the complex planes of the initial and final three-momenta of the Lippmann-Schwinger equation in coupled or uncoupled partial-wave amp…
Hyperon resonances coupled to pseudoscalar- and vector-baryon channels
K. P. Khemchandani, A. Martínez Torres, J. A. Oller
We study hyperon resonances by solving coupled channel scattering equations. The coupled systems include pseudoscalar- and vector-baryon channels. The parameters of the model are r…