Article
Physics, Particles & Fields
Benjamin Alvarez, Johan Bijnens, Mattias Sjo
Summary: The article introduces positivity bounds derived from the principles of analyticity, unitarity and crossing symmetry to constrain the low-energy constants of chiral perturbation theory. These bounds are produced for meson-meson scattering with different flavors, up to and including next-to-next-to-leading order, using second and higher derivatives of the amplitude. The authors enhance these bounds by utilizing the most general isospin combinations possible and analytically integrating the low-energy range of the discontinuities, as well as presenting a general mathematical framework for efficiently managing large numbers of positivity bounds.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Lukas Graf, Brian Henning, Xiaochuan Lu, Tom Melia, Hitoshi Murayama
Summary: In this study, Hilbert series techniques were applied to enumerate operators in the mesonic QCD chiral Lagrangian. The method was extended to incorporate external fields and address the action of charge conjugation by folding su n Dynkin diagrams. New results include enumeration of anomalous operators and various parity terms in the chiral Lagrangian.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Ki-Seok Kim, Mitsuhiro Nishida, Yoonseok Choun
Summary: By implementing a nonperturbative Wilsonian renormalization group (RG) transformation, we establish an effective holographic dual description with an emergent extradimension associated with an RG scale. In the large-N limit, we derive an equation of motion for an order-parameter field, such as the chiral condensate. We demonstrate an intertwined structure between the first-order RG flow equations and the second-order differential equation of the order-parameter field, leading to a nonperturbative RG-improved mean-field theory. Assuming translational symmetry as the vacuum state, we solve the nonlinear coupled mean-field equations by matching the UV and IR solutions, revealing an RG flow from a weakly coupled chiral-symmetric UV fixed point to a strongly correlated chiral-symmetry broken IR fixed point.
Article
Physics, Particles & Fields
Andrea L. Guerrieri, Joao Penedones, Pedro Vieira
Summary: The article demonstrates the use of numerical S-matrix bootstrap method to derive bounds on the Wilson coefficients controlling the low-energy dynamics of massless pions. This approach provides a proof of concept for deriving non-perturbative bounds on massless EFTs in more than two spacetime dimensions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Nuclear
Daren Zhou, Bingwei Long, R. G. E. Timmermans, U. van Kolck
Summary: This study investigates the renormalization of iterated one-pion exchange (OPE) in the antinucleon-nucleon ((N) over barN) system using chiral effective field theory (Chi EFT), finding the need for additional contact interactions compared to naive dimensional analysis for renormalization. Results show the dependence on cutoff radius.
Article
Physics, Particles & Fields
Thomas Vonk, Feng-Kun Guo, Ulf-G Meissner
Summary: This study extends previous research on axion-nucleon coupling to include SU(3) flavor symmetry and shows significant coupling of axions to full SU(3) baryon octet and hyperons. The results have important phenomenological implications related to the so-called axion window, especially in the presence of hyperons in dense nuclear matter in stellar objects like neutron stars.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Tamanna Jain, Piero Rettegno, Michalis Agathos, Alessandro Nagar, Lorenzo Turco
Summary: We determine the general local-in-time effective-one-body (EOB) Hamiltonian for massless scalar-tensor (ST) theories at third post-Newtonian (PN) order, which is useful for building high-accuracy waveform models in ST theory and performing precise tests against general relativity.
Article
Physics, Nuclear
Rui Peng, Songlin Lyu, Sebastian Konig, Bingwei Long
Summary: A momentum-dependent formulation based on a stationary spin-0 and isospin-1 dibaryon field is proposed to improve convergence of chiral effective field theory in the S-1(0) channel of NN scattering. Rapid order-by-order convergence is found in S-1(0). The study also investigates the triton binding energy and compares it to standard chiral effective field theory with partly perturbative pions, while examining the consistency of the chiral Lagrangian for the new formulation.
Article
Astronomy & Astrophysics
Hao Xu
Summary: The chiral interactions of the hidden charm D (D) over bar* system are studied using chiral effective field theory in this paper. The interacting potentials of the S-wave D (D) over bar* system are calculated and their behaviors in coordinate space and bound state properties are investigated. The study indicates an interacting strength ordering among the considered channels and predicts multiple structures in the D (D) over bar* mass region.
Article
Astronomy & Astrophysics
Yi-Lin Li, Xi-Jing Wang, Guoyang Fu, Jian-Pin Wu
Summary: In this paper, a 3-dimensional holographic effective theory with gauge-axion coupling is implemented and an analytical black hole solution is obtained. The Direct current (DC) thermoelectric conductivities are investigated, and it is found that the DC electric conductivity is temperature dependent when the gauge-axion coupling vanishes, unlike the 4-dimensional axion model. Moreover, the gauge-axion coupling induces a metal insulator transition (MIT) at zero temperature. The properties of other DC thermoelectric conductivities are also discussed, and the violation of the Wiedemann-Franz law in this model is discovered.
Article
Physics, Multidisciplinary
Xu Li, Hao Xu, Chengjie Yang, Cen Zhang, Shuang-Yong Zhou
Summary: In this paper, we discuss a general method for obtaining full positivity bounds on multifield effective field theories, showing that the traditional approach only gives incomplete bounds for theories with three or more low-energy modes. We introduce a new method to determine optimal positivity bounds either analytically or numerically, and demonstrate its effectiveness with various examples in particle physics and cosmology. This SDP approach leads to improved or entirely new results, and is numerically more efficient compared to previous methods.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Chia-Jui Chou, Hans B. Lao, Yi Yang
Summary: In this study, the generalized entanglement entropy in the higher-dimensional two-sided eternal black hole is investigated using double holography. By introducing an end of the world ETW brane, a new type of Ryu-Takayanagi surface is discovered alongside the previously known Hartman-Maldacena surface and the island Ryu-Takayanagi surface. The phase transition among the three Ryu-Takayanagi surfaces at different temperatures is explored and the phase diagram as well as the Page curve are obtained.
Article
Physics, Particles & Fields
Yan Liu, Xi-Jing Wang, Jian-Pin Wu, Xin Zhang
Summary: We construct a holographic effective superconducting theory by considering a special gauge-axion coupling. In the normal state, a peak emerges in the mid-IR in the AC conductivity for certain strength of broken translations and the gauge-axion coupling, attributed to the emergence of pseudo-Goldstone mode. In the superconducting phase, the gauge-axion coupling leads to a more evident gap in low-frequency conductivity.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Chiara Arina, Jan Hajer, Philipp Klose
Summary: A framework for constructing portal effective theories (PETs) that couple effective field theories of the Standard Model (SM) to light hidden messenger fields is presented. Electroweak and strong scale PETs coupling the SM to messengers with different spins are constructed within this framework. The strong scale PETs define a set of portal currents coupling hidden sectors to QCD, and also establish portal chiral perturbation theory to relate these currents to light pseudoscalar mesons.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Subhroneel Chakrabarti, Divyanshu Gupta, Arkajyoti Manna, Madhusudhan Raman
Summary: The study examines the TT deformations of chiral bosons and chiral fermions using the formalism developed by Sen. It is found that the TT-deformed Lagrangian can be computed in closed form for arbitrary numbers of left- and right-chiral bosons, resulting in a novel non-local action in Sen's formalism. The stress tensor of the TT-deformed free fermion is shown to coincide with the undeformed seed theory, with the behavior explained by the purely topological nature of the deformation term in the action. This observation also clarifies why the TT deformation of multiple free fermions truncates at linear order.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
D. R. Entem, J. A. Oller
Summary: Chiral Effective Field Theory (chi EFT) has been widely used in studying the NN interaction over the past three decades. This work reviews methods aimed at completely eliminating cut-off dependencies, such as renormalization with boundary conditions, renormalization with one counter term in momentum space, and the exact N/D method. These methods are compared and the exact N/D method is shown to be able to renormalize singular repulsive interactions beyond others.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Editorial Material
Physics, Multidisciplinary
J. A. Oller
Summary: This special issue of the European Journal of Physics: Special Topics discusses problems in physical processes involving particles comprising the lighter part of the strong interactions spectrum. Experts introduce active and timely issues in this field, rooted in known aspects while pushing towards the frontier of knowledge with new techniques. Topics covered include properties of the lightest scalar resonances, the hunt for the lightest glueballs, and advances in QCD scattering amplitudes.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2021)
Article
Physics, Multidisciplinary
Alexandre Salas-Bernardez, Felipe J. Llanes-Estrada, Jose Antonio Oller, Juan Escudero-Pedrosa
Summary: Effective Field Theories (EFTS) constructed as derivative expansions in powers of momentum provide a controllable approximation to strong dynamics, but their predictive power towards new physics at higher energy scales is limited. Unitarized chiral perturbation theory techniques have been devised to extend the reach of EFT, but uncertainties in these extensions have not been thoroughly addressed.
Proceedings Paper
Physics, Particles & Fields
Juan Jose Sanz-Cillero, Antonio Pich, Ignasi Rosell
Summary: This study explores a non-linear realization of the electroweak symmetry-breaking pattern to construct a low-energy effective theory, which is later extended by heavy new-physics resonances. By imposing high-energy constraints from Weinberg sum-rules and form-factor asymptotic behavior, relations between resonance masses and low-energy effective couplings are obtained. These predictions are compared with current experimental data, leading to the inference of some resonance mass bounds.
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2021)
Proceedings Paper
Physics, Particles & Fields
Juan Escudero-Pedrosa, Felipe J. Llanes-Estrada, Jose Antonio Oller, Alexandre Salas-Bernardez
Summary: This passage discusses the Effective Field Theories for Goldstone Boson scattering and raises concerns about theoretical uncertainties, suggesting the need to extend the EFT to regimes where partial waves are saturating unitarity if new-physics deviations from the Standard Model are found in low-energy coefficients. The uncertainties of the well-known Inverse Amplitude Method (IAM) are also analyzed in depth.
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2021)
Article
Physics, Multidisciplinary
J. M. Alarcon, J. A. Oller
Summary: This article reexamines the calculation of energy density of a spin 1/2 fermion many-body system using ladder diagrams, with an emphasis on arbitrary two-body scattering amplitudes in vacuum. It provides a partial-wave decomposition of in-medium two-body scattering amplitudes, as well as an expression for calculating the energy density in a partial-wave amplitude expansion. The study resolves the case of contact interactions and shows that renormalized results can be obtained directly in terms of scattering data parameters within cutoff regularization.
Article
Astronomy & Astrophysics
D. Blas, J. Martin Camalich, J. A. Oller
Summary: In this study, we investigate graviton-graviton scattering in partial-wave amplitudes by unitarizing their Born terms. By introducing an S-matrix associated with this resummation that is free of infrared divergences, based on unitarity and analyticity, we are able to apply S-matrix techniques. A scalar graviton-graviton resonance called the graviball is obtained as a pole in the nonperturbative S-wave amplitude with vacuum quantum numbers. Its resonant effects along the physical real-saxis may peak at values substantially lower than the UV cutoff squared of the theory, potentially leading to phenomenological consequences at relatively low-energy scales, similar to resonance phenomena in QCD.
Article
Physics, Particles & Fields
D. Blas, J. Martin Camalich, J. A. Oller
Summary: A method to unitarize the scattering amplitude produced by infinite-range forces is developed and applied to Born terms. The study finds a scalar graviton-graviton resonance called the graviball, and discusses its corrections in the gravitational effective field theory. Additionally, this method is also applicable to Coulomb scattering and an energy-dependent potential based on the Coulomb one.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
J. A. Oller
Summary: This study compares nonrelativistic Coulomb scattering with two unitarization methods for infinite-range forces and finds that one method accurately reproduces the exact solution, while the other method fails to reproduce the known solution and leads to zero binding energy.
Article
Physics, Particles & Fields
Clara Alvarez-Luna, Sergio de la Calle-leal, Jose A. R. Cembranos, Juan Jose Sanz-Cillero
Summary: The Coleman-Weinberg mechanism is a method by which a scalar field without mass parameters acquires mass due to the anomalous nature of scale symmetry. It triggers spontaneous symmetry breaking and the appearance of a non-trivial vacuum through loop corrections.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Nuclear
J. M. Alarcon, J. A. Oller
Summary: We investigate the effect of P-wave interactions on the energy of a degenerate gas of spin-1/2 fermions. By summing the ladder diagrams, we calculate the energy per particle in the many-body system and obtain a renormalized result. It is found that the resonance poles caused by P-wave interactions contradict the Hermiticity of the Hamiltonian, resulting in the instability of unpolarized spin-1/2 fermionic normal matter.
Article
Astronomy & Astrophysics
Raquel Gomez-Ambrosio, Felipe J. Llanes-Estrada, Alexandre Salas-Bernardez, Juan J. Sanz-Cillero
Summary: The electroweak symmetry-breaking sector, which is an important and unknown part of the Standard Model, may be beyond the reach of current accelerator efforts. Therefore, effective field theory becomes a logical method to use, with Standard Model effective field theory becoming the standard. This article discusses the differences between Higgs effective field theory and Standard Model effective field theory, as well as correlations among corrections to the Higgs effective field theory coefficients that help determine the viability of Standard Model effective field theory.
Article
Astronomy & Astrophysics
Ze-Qiang Wang, Xian-Wei Kang, J. A. Oller, Lu Zhang
Summary: This study investigates the composition and importance of the x-x- ??? KK?? and x-ri ??? KK?? components in the f0(980) and a0(980) resonances. It is found that the meson-meson components dominate in the f0(980) while they are subdominant in the a0(980) resonance. The study also emphasizes the need to distinguish between bare and dressed couplings and widths in the parameterization.
Article
Astronomy & Astrophysics
Meng-Lin Du, Zhi-Hui Guo, J. A. Oller
Summary: The study found that Pcs(4459) has a clear molecular nature, with Xi c over line D* as the dominant component. The results support the existence of two resonances with different spins in the energy region of Pcs(4459).
Article
Astronomy & Astrophysics
Zhi-Hui Guo, J. A. Oller
Summary: The recently discovered fully charmed tetraquark candidate X(6900) was analyzed using various theoretical approaches, showing that the two-meson components do not play dominant roles in X(6900). Resonance poles determined from the coupled-channel study were found to be consistent with experimental analyses, and a new narrow resonance X(6825) was predicted below the chi(c0)chi(c0) threshold.