In this article, we construct both the [sc]T [sc]A + [sc]A[sc]T type and [sc]T [sc]V − [sc]V [sc]T type axialvector currents with J P C = 1 ++ to study the mass of the X(4140) with the QCD sum rules. The predicted masses support assigning the X(4140) to be the [sc]T [sc]V − [sc]V [sc]T type axialvector tetraquark state. Then we study the hadronic coupling constant g XJ/ψφ with the QCD sum rules based on solid quark-hadron duality, and obtain the decay width Γ(X(4140) → J/ψφ) = 86.9±22.6 MeV, which is in excellent agreement with the experimental data 83 ± 21 +21 −14 MeV from the LHCb collaboration.

In this article, we calculate the contributions of the vacuum condensates up to dimension-6 in the operator product expansion, study the masses and decay constants of the heavy tensor mesons D * 2 (2460), D * s2 (2573), B * 2 (5747), B * s2 (5840) using the QCD sum rules. The predicted masses are in excellent agreement with the experimental data, while the ratios of the decaywhere the exp denotes the experimental value.

In this article, we assume that there exist the pseudoscalar D D ¯ s 0 * ( 2317 ) and D * D ¯ s 1 * ( 2460 ) molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formula μ = M X / Y / Z 2 − ( 2 M c ) 2 to determine the energy scales of the QCD spectral densities. The numerical results, M Z 1 = 4.61 − 0.08 + 0.11 GeV and M Z 2 = 4.60 − 0.06 + 0.07 GeV , which lie above the D D ¯ s 0 * ( 2317 ) and D * D ¯ s 1 * ( 2460 ) thresholds respectively, indicate that the D D ¯ s 0 * ( 2317 ) and D * D ¯ s 1 * ( 2460 ) are difficult to form bound state molecular states, the Z1,2 are probably resonance states.

The feasibility study of an underground laboratory in the Polkowice-Sieroszowice mine in Poland (SUNLAB) as a host of a far detector in a long-baseline neutrino oscillation experiment was performed. The SUN-LAB location was previously studied under the LAGUNA FP7 project as a location for the underground multipurpose laboratory. The complementary study of the long-baseline neutrino experiment presented in this paper was performed as a continuation of this idea. A neutrino beam produced at CERN and a far LAr TPC detector hosted in the SUNLAB Laboratory were simulated. The sensitivity of such an experiment for the determination of the CP-symmetry violation in neutrino sector was calculated. The experiment at SUNLAB equipped with the 100 kton LAr TPC detector after 10 years of data taking can give the coverage of δ CP parameter space of 58% (60%) for the normal (inverted) neutrino mass hierarchy at 3σ level and in the both cases reaches 5σ level in the case of the maximal violation.

In this article, we study the masses and pole residues of the pseudoscalar-diquark-pseudoscalarantidiquark type and vector-diquark-vector-antidiquark type scalar hidden-charm cucd (cucs) tetraquark states with QCD sum rules by taking into account the contributions of the vacuum condensates up to dimension-10 in the operator product expansion. The predicted masses can be confronted with the experimental data in the future. Possible decays of those tetraquark states are also discussed.