Article
Astronomy & Astrophysics
Qi Meng, Emiko Hiyama, Makoto Oka, Atsushi Hosaka, Chang Xu
Summary: The spectrum of doubly heavy tetraquarks is studied in a quark model, showing that the compact bound states are shifted up due to the repulsive central force between quarks and antiquarks. This effect may explain the small binding energy in Tcc. Additionally, a resonant state is reported.
Article
Physics, Particles & Fields
Yu-Ji Shi, Ulf-G Meissner, Zhen-Xing Zhao
Summary: In this work, we study the resonance contributions to the decay B- -> K+ K-pi(-) and calculate the branching fractions for each resonance. The study utilizes the quasi two-body decay approach and takes into account the effects of non-resonant and final-state interactions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
A. M. Gasparyan, E. Epelbaum
Summary: In this study, we investigate two-nucleon scattering using chiral effective field theory with a finite cutoff to next-to-leading order in the chiral expansion. We propose a scheme where the contributions of the lowest-order interaction to the scattering amplitude are summed up to an arbitrary order, while the corrections beyond leading order are iterated only once. We consider a general form of the regulator for the leading-order potential, including local and non-local structures. The main objective is to address the formal aspects of renormalizability within this scheme, and we provide a rigorous proof that power-counting breaking terms can be absorbed into the renormalization of low energy constants. We also demonstrate that the cutoff dependence of the scattering amplitude can be reduced by perturbatively subtracting the regulator artifacts at next-to-leading order. The numerical results confirm the applicability of our scheme for nucleon-nucleon scattering.
Article
Physics, Nuclear
G. Chanfray, M. Ericson
Summary: The study evaluates the cross section for gamma production by neutrinos through a meson exchange effect, resulting in a slight increase in the cross section, especially at low neutrino energies, which may impact the understanding of the low-energy excess of electron-like events observed in the MiniBooNE experiment.
Article
Astronomy & Astrophysics
Sheng Lu, Mao-Zhi Yang
Summary: In this study, we use a modified perturbative QCD approach to investigate B -xx decay, considering the transverse momenta of partons for calculating branching ratios and CP violation. Sudakov factors associated with each meson are included to suppress soft contribution in QCD. However, the suppression by the Sudakov factor alone is not sufficient, so we introduce a soft scale cutoff and soft form factors for Bx transition and xx production. The main next-to-leading-order contributions, including vertex correction, quark-loop, and magnetic penguin, are taken into account. To address the long-standing puzzle of B0 -x0x0 decay, where the theoretical prediction of the branching ratio is significantly smaller than experimental data, we introduce a color-octet matrix element that captures long-distance dynamics. With reasonable parameter values, all the branching ratios and CP violation are in good agreement with experimental data.
Article
Astronomy & Astrophysics
Zhen-Hua Zhang
Summary: The FBI-CPA is a novel observable for measuring CP asymmetry in multi-body decays of heavy mesons. It can isolate the CP asymmetry associated with interference of different wave amplitudes and effectively double the statistics compared to conventional methods. It is suggested to perform measurements of FBI-CPA in three-body decay channels of charm and beauty mesons.
Article
Engineering, Environmental
Zheng-Jun Fu, Shang-Kun Jiang, Xin-Yi Chao, Chun-Xu Zhang, Qixun Shi, Zhen-Yuan Wang, Mei-Ling Liu, Shi-Peng Sun
Summary: The treatment of wastewater containing heavy metal mixtures is crucial for human and environmental health. We have successfully integrated ion exchange and nanofiltration into a single iNF membrane, allowing for efficient removal of heavy metal ions. This integrated process is simple, scalable, and universally applicable.
Article
Astronomy & Astrophysics
Yuuki Hayashi, Yukinari Sumino, Hiromasa Takaura
Summary: The value of V-cb is determined using perturbative series for the inclusive semileptonic B decay width and the masses of bottomonium 1S states. The study highlights a significant difference in V-cb between two 1S mass schemes, primarily caused by the theoretical inadequacy in describing the observed mass splitting of bottomonium 1S states. The significance of non-perturbative effects in HQET with respect to the current perturbative accuracy is also examined.
Article
Physics, Particles & Fields
Geng Li, Tianhong Wang, Jing-Bo Zhang, Guo-Li Wang
Summary: This paper investigates the FCNC decay processes of B and Bc mesons with the emission of an invisible particle, considering both spin-0 and spin-1 cases. An effective model-independent Lagrangian is introduced to describe the coupling between the light invisible boson and quarks, and the constraints of coupling coefficients are extracted from experimental upper limits. These constraints are used to predict upper limits of branching fractions of corresponding Bc decays, achieving maximum values when the mass of the invisible particle is approximately 3.5-4 GeV.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Correction
Materials Science, Multidisciplinary
Teruo Kurai
Summary: Illegal manipulation was noticed in the second line of Eq. (22), which involved commuting q(1)(+) (z) and q(3)(+) (r - z). By realigning the string part, the manipulation was avoided and the obtained results remained unchanged.
RESULTS IN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Stefan Groote, Mikhail A. Ivanov, Jurgen G. Korner, Valery E. Lyubovitskij, Pietro Santorelli, Chien-Thang Tran
Summary: In the semileptonic decays of heavy mesons and baryons, the lepton-mass dependence plays a role in the quadratic terms of the cosine distribution, known as the convexity parameter. This observation provides a way to test lepton universality independently of form-factor effects. By defining optimized partial rates, one can investigate how new physics effects may affect the identity of the rates in different lepton modes.
Article
Physics, Particles & Fields
A. Gomez Nicola, J. Ruiz de Elvira, A. Vioque-Rodriguez, D. Alvarez-Herrero
Summary: By using Ward identities and lattice data, the study reconstructs scalar and pseudoscalar susceptibilities in the isospin 1/2 channel, finding that χSK reaches a maximum above the QCD chiral transition before degenerating with χPK. The Unitarized Chiral Perturbation Theory at finite temperature reproduces the peak structure of χSK, highlighting the importance of thermal interactions and allowing for examination of χSK dependence on light- and strange-quark masses. The results provide an alternative sign for O(4)xU(1)A restoration, controlled by the ml/ms ratio, and emphasize the role of strangeness in reconciling tensions among lattice results regarding U(1)A restoration.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
C. Ayerbe Gayoso, L. Bibrzycki, S. Diehl, S. Heppelmann, D. W. Higinbotham, G. M. Huber, S. J. D. Kay, S. R. Klein, J. M. Laget, W. B. Li, V Mathieu, K. Park, R. J. Perry, B. Pire, K. Semenov-Tian-Shansky, A. Stanek, J. R. Stevens, L. Szymanowski, C. Weiss, B-G Yu
Summary: Backward angle (u-channel) scattering provides complementary information for hadron spectroscopy and structure studies, with recent progress focusing on measuring and understanding high energy reactions with baryon charge exchange in the backward angle. Different theoretical models and methods have been used to describe backward angle measurements, with planned future measurements aiming to address outstanding questions and challenges in u-channel physics.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Physics, Nuclear
K. J. Eskola, C. A. Flett, V Guzey, T. Loytainen, H. Paukkunen
Summary: This study presents the first NLO perturbative QCD study on the rapidity-differential cross sections of coherent exclusive photoproduction of J/psi mesons in heavy-ion ultraperipheral collisions at the LHC. The research considers the NLO cross sections of photon-nucleon interactions, t dependence using a nuclear form factor, and photon fluxes of colliding nuclei. The study quantifies the NLO contributions, evaluates the uncertainties arising from scale choice and PDFs, and compares the results with experimental data.
Article
Physics, Multidisciplinary
Marat Siddikov, Ivan Schmidt
Summary: The study indicates that the use of three-pomeron contributions can better explain recent data on the multiplicity dependence of cross-sections, particularly for open-heavy flavor mesons and quarkonia.
Article
Physics, Nuclear
Manuel Pavon Valderrama
EUROPEAN PHYSICAL JOURNAL A
(2020)
Article
Physics, Particles & Fields
Tian-Wei Wu, Ming-Zhu Liu, Li-Sheng Geng, Emiko Hiyama, Manuel Pavon Valderrama, Wen-Ling Wang
EUROPEAN PHYSICAL JOURNAL C
(2020)
Article
Physics, Particles & Fields
Fang-Zheng Peng, Mao-Jun Yan, Mario Sanchez Sanchez, Manuel Pavon Valderrama
Summary: The LHCb collaboration's observation of the P-cs(4459) adds to the known hidden-charm pentaquark family, and suggests a molecular explanation for its properties. Additionally, an accidental symmetry between the P-cs(4459) and P-c(4440/4457) potentials is highlighted.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Lorenzo Contessi, Johannes Kirscher, Manuel Pavon Valderrama
Summary: The description of unitary few-boson systems is simple, requiring only the three-body binding energy as a parameter to predict binding energies. The correlation between three- and many-boson systems in the case of resonant interactions between two species of bosons depends on the number of particles of each species. The emergence of distinct three-body scales in few-body clusters with resonant interactions suggests different universal classes of N-body systems with unique scaling properties.
Article
Physics, Multidisciplinary
Daniel Odell, Manuel Pavon Valderrama, Lucas Platter
Summary: Effective field theories require regularization and renormalization to make accurate predictions. Although regularization is not essential for the observable predictions of EFTs, the details of regulatory dependence can provide insights into the inner workings of an EFT. By quantitatively comparing the inferred residual cutoff dependence from different regulators, we demonstrate that cutoff variations provide limited information about uncertainties and power counting (at least in practical settings).
Article
Physics, Particles & Fields
Fang-Zheng Peng, Ming-Zhu Liu, Ya-Wen Pan, Mario Sanchez Sanchez, Manuel Pavon Valderrama
Summary: The discovery of three pentaquark peaks by the LHCb collaboration has implications for hadron spectroscopy and suggests the existence of hidden-charm objects that may be hadronic molecules. The symmetries of heavy-flavor and SU(3)-flavor imply the presence of five-flavor pentaquarks and light-flavor partners. In total, a predicted total of 45 new pentaquarks could extend the understanding of hadron composition.
Article
Astronomy & Astrophysics
Fang-Zheng Peng, Mao-Jun Yan, Mario Sanchez Sanchez, Manuel Pavon Valderrama
Summary: The heavy hadron spectrum is constrained by heavy-quark spin and SU(3)-flavor symmetries. In the molecular picture, the Y(4230), Y(4360), Y(4500), and Y(4620) vectorlike resonances are linked by these two symmetries. By formulating a contact-range effective field theory for charmed meson-antimeson systems, it is found that these resonances can be explained as molecular states with specific partner states and bound states. The predictions can be improved by considering coupled channel dynamics.
Article
Astronomy & Astrophysics
Fang-Zheng Peng, Mario Sanchez Sanchez, Mao-Jun Yan, Manuel Pavon Valderrama
Summary: The spectrum of heavy-hadron molecules can provide insights into the nature of exotic states discovered in experiments. By studying the short-range interaction between heavy hadrons, we can predict the existence of different molecules and use these predictions to validate previous hypotheses. This approach can also be applied to light baryons, recovering a certain level of symmetry and reproducing mass results.
Article
Physics, Particles & Fields
Mao-Jun Yan, Fang-Zheng Peng, Mario Sanchez Sanchez, Manuel Pavon Valderrama
Summary: Recently, the LHCb Collaboration observed a new pentaquark state, the P-c(4337)(+), which may be a meson-baryon bound state. However, its spin and parity have not been determined yet. In this manuscript, we explore several possibilities and propose the existence of a series of anticharmed meson - antitriplet charmed baryon bound states.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Mao-Jun Yan, Manuel Pavon Valderrama
Summary: The LHCb Collaboration has recently announced the discovery of the T-cc(+) tetraquark, which is only a few hundred keV below the D*+D-0 threshold. It is expected to have a molecular component, and theoretical predictions can be made accurately due to the separation of scales. The important decay channels include D+D-0 pi(0), (DD0)-D-0 pi(+), and D+D-0 gamma. The mass and width of the T-cc(+) tetraquark depend on the resonance profile due to its closeness to threshold.
Article
Astronomy & Astrophysics
Mao-Jun Yan, Fang-Zheng Peng, Mario Sanchez Sanchez, Manuel Pavon Valderrama
Summary: Early speculations on heavy hadron molecules were based on the potential binding from light-meson exchange forces, with particular attention to the role of the axial meson. While the contribution to binding from the axial meson is modest, it cannot be neglected especially in the isovector sector where vector meson exchange cancels out, pointing towards the potential existence of two Z(cs) (3985)-like resonances.
Article
Astronomy & Astrophysics
Zhi Yang, Xu Cao, Feng-Kun Guo, Juan Nieves, Manuel Pavon Valderrama
Summary: Quantum chromodynamics reveals various symmetries that can predict new hadrons from existing ones. Based on SU(3)-flavor symmetry, strange partners of Z(c) are expected to exist with certain hadronic molecular configurations. The masses of these partners rely on theoretical schemes and should align with specific thresholds.
Article
Astronomy & Astrophysics
Lorenzo Contessi, Johannes Kirscher, Manuel Pavon Valderrama
Summary: Theoretical investigations were carried out on the X(3872) resonance and other multimeson states, predicting the formation of potential multimeson clusters and explaining the binding energy of meson states and the conditions for tetramer formation.
Article
Astronomy & Astrophysics
Ming-Zhu Liu, Tian-Wei Wu, Mario Sanchez Sanchez, Manuel Pavon Valderrama, Li-Sheng Geng, Ju-Jun Xie
Summary: The LHCb collaboration has recently observed three pentaquark peaks, which are very close to heavy baryon-meson thresholds. The spin-parities of these states are not yet known, but one is assumed to be 1/2- and the other two are of unknown spin-parity. The one-boson-exchange model is used to predict the quantum numbers of the molecular pentaquarks.
Article
Astronomy & Astrophysics
Fang-Zheng Peng, Jun-Xu Lu, Mario Sanchez Sanchez, Mao-Jun Yan, Manuel Pavon Valderrama
Summary: The study explores the possible structures of the LHCb pentaquarks P-c(4312), P-c(4440), and P-c(4457) and analyzes the effects of extra channel dynamics within two effective field theories. It is found that P-c(4440) and P-c(4457) are predominantly Σ(c)(D) over bar* molecules, but the P-c(4457) with quantum numbers J(P) = 1/2(-) may exhibit a Lambda(2595)(D) over bar S-wave molecule state in addition.