Heavy-quark mesons in the diabatic approach: string breaking and the quarkoniumlike spectrum

The Born-Oppenheimer approximation provides a description of heavy-quark mesons firmly based on lattice QCD, but its validity is limited to the lightest states lying far below the first open-flavour meson-meson threshold. This limitation can be overcome in the diabatic framework, a formalism first introduced in molecular physics, where the dynamics is encoded in a potential matrix whose elements can be derived from unquenched lattice QCD studies of string breaking. The off-diagonal elements of the potential matrix provide interaction between heavy quark-antiquark and meson-meson pairs, from which the mixing of quarkonium states with molecular components and the OZI-allowed strong decay widths are directly calculated. This allows for a QCD-based unified description of conventional quarkonium and unconventional mesons containing quark-antiquark and meson-meson components, what has proved to be successful for charmoniumlike and bottomoniumlike resonances.

Asymptotic Stability of Minkowski Space-Time with Non-compactly Supported Massless Vlasov Matter

We prove the global asymptotic stability of the Minkowski space for the massless Einstein–Vlasov system in wave coordinates. In contrast with previous work on the subject, no compact support assumptions on the initial data of the Vlasov field in space or the momentum variables are required. In fact, the initial decay in v is optimal. The present proof is based on vector field and weighted vector field techniques for Vlasov fields, as developed in previous work of Fajman, Joudioux, and Smulevici, and heavily relies on several structural properties of the massless Vlasov equation, similar to the null and weak null conditions. To deal with the weak decay rate of the metric, we propagate well-chosen hierarchized weighted energy norms which reflect the strong decay properties satisfied by the particle density far from the light cone. A particular analytical difficulty arises at the top order, when we do not have access to improved pointwise decay estimates for certain metric components. This difficulty is resolved using a novel hierarchy in the massless Einstein–Vlasov system, which exploits the propagation of different growth rates for the energy norms of different metric components.

Quark Structure of the X (4500), X (4700) and χc(4P,5P) States

We study some of the main properties (masses and open-flavor strong decay widths) of 4P and 5P charmonia. While there are two candidates for the χc0(4P,5P) states, the X(4500) and X(4700), the properties of the other members of the χc(4P,5P) multiplets are still completely unknown. With this in mind, we start to explore the charmonium interpretation for these mesons. Our second goal is to investigate if the apparent mismatch between the Quark Model (QM) predictions for χc0(4P,5P) states and the properties of the X(4500) and X(4700) mesons can be overcome by introducing threshold corrections in the QM formalism. According to our coupled-channel model results for the threshold mass shifts, the χc0(5P)→X(4700) assignment is unacceptable, while the χc0(4P)→X(4500) or X(4700) assignments cannot be completely ruled out.

Mass spectrum and strong decays of tetraquark $${\bar{c}}{\bar{s}} qq$$ states

We systematically study the mass spectrum and strong decays of the S-wave $${\bar{c}}{\bar{s}} q q$$ c ¯ s ¯ q q states in the compact tetraquark scenario with the quark model. The key ingredients of the model are the Coulomb, the linear confinement, and the hyperfine interactions. The hyperfine potential leads to the mixing between different color configurations, and to the large mass splitting between the two ground states with $$I(J^P)=0(0^+)$$ I ( J P ) = 0 ( 0 + ) and $$I(J^P)=1(0^+)$$ I ( J P ) = 1 ( 0 + ) . We calculate their strong decay amplitudes into the $${\bar{D}}^{(*)}K^{(*)}$$ D ¯ ( ∗ ) K ( ∗ ) channels with the wave functions from the mass spectrum calculation and the quark-interchange method. We examine the interpretation of the recently observed $$X_0(2900)$$ X 0 ( 2900 ) as a tetraquark state. The mass and decay width of the $$I(J^P)=1(0^+)$$ I ( J P ) = 1 ( 0 + ) state are $$M=2941$$ M = 2941 MeV and $$\Gamma _X=26.6$$ Γ X = 26.6 MeV, respectively, which indicates that it might be a good candidate for $$X_0(2900)$$ X 0 ( 2900 ) . Meanwhile, we also obtain an isospin partner state $$I(J^P)=0(0^+)$$ I ( J P ) = 0 ( 0 + ) with $$M=2649$$ M = 2649 MeV and $$\Gamma _{X\rightarrow {\bar{D}} K}=48.1$$ Γ X → D ¯ K = 48.1 MeV, respectively. Future experimental search for X(2649) will be very helpful.

Strong decays of the newly $$P_{cs}(4459)$$ as a strange hidden-charm $$\Xi _c{\bar{D}}^*$$ molecule

In our former work [arXiv:2011.07214], the $$P_{cs}(4459)$$ P cs ( 4459 ) observed by the LHCb Collaboration can be explained as a coupled strange hidden-charm $$\Xi _c{\bar{D}}^*/\Xi _c^*{\bar{D}}/\Xi _c'{\bar{D}}^*/\Xi _c^*{\bar{D}}^*$$ Ξ c D ¯ ∗ / Ξ c ∗ D ¯ / Ξ c ′ D ¯ ∗ / Ξ c ∗ D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . Here, we further discuss the two-body strong decay behaviors of the $$P_{cs}(4459)$$ P cs ( 4459 ) in the meson-baryon molecular scenario by input the former obtained bound solutions. Our results support the $$P_{cs}(4459)$$ P cs ( 4459 ) as the strange hidden-charm $$\Xi _c{\bar{D}}^*$$ Ξ c D ¯ ∗ molecule with $$I(J^P)=0(3/2^-)$$ I ( J P ) = 0 ( 3 / 2 - ) . The relative decay ratio between $$\Lambda _cD_s^*$$ Λ c D s ∗ and $$J/\psi \Lambda $$ J / ψ Λ is around 10, where the partial decay width for the $$\Lambda _cD_s^*$$ Λ c D s ∗ channel is around 0.6 to 2.0 MeV.

Alpha-emitting nanoparticles and the Warburg Effect, skin diseases, eating disorders, musculoskeletal disorders, alcoholism, cigarette, hypersexuality and neurofibromatosis type 1

Alpha emitting nanoparticulates in internal contamination, an IARC Class 1 carcinogen, have an extremely wide list of effects. New effects are here demonstrated based on a wide epidemiological survey. WHO data in particular is used together with other large sets and juxtaposed to known sources of variations of radioactivity contamination in the environment to demonstrate the link which is always explained by the strong decay energy and its impact on the organism. Some behaviours are shown to be strategies of pain reduction, others of decontamination. This article confirms the simple logic of biophysics (the linear-no-threshold model) outlined by the author in previous publications.