The diffractive interaction is a feature of hadron-hadron scattering at high energy corresponding to a t-channel exchange of the vacuum quantum numbers and a small momentum transfer. It has been has been described, in the past, in the framework of Regge theory, where the exchange was interpreted as the Pomeron (IP ) trajectory, characterized by a weak energy dependence, in particular, with resp...

The LHCb Collaboration at the Large Hadron Collider at CERN discovered two pentaquark states P_{c}(4380) and P_{c}(4450). These two hidden-charm states are interpreted as the loosely bound Σ_{c}(2455)D^{*} and Σ_{c}^{*}(2520)D^{*} molecular states in the boson exchange interaction model, which provides an explanation for why the experimental width of P_{c}(4450) is much narrower than that of P_...

In theoretical hadron physics mesons are a center of attention. Constructed in a simpler way than baryons in the quark model, they still present a considerable challenge if one aims at an understanding of all their aspects in terms of quarks and gluons in the context of Quantum Chromodynamics, the quantum field theory of the strong interaction. Complementary to (constituent-) quark models, redu...

We explore a possibility to generate exotic hadrons dynamically in the scattering of hadrons. The s-wave scattering amplitude of an arbitrary hadron with the Nambu-Goldstone boson is constructed so as to satisfy the unitarity condition and the chiral low energy theorem. We find that the chiral interaction for the exotic channels is in most cases repulsive, and that the strength of the possible ...

An analysis of muon and hadron rates observed in the central detector of the KASCADE experiment has been carried out. The data are compared to CORSIKA simulations employing the high-energy hadronic interaction models QGSJET, DPMJET, HDPM, SIBYLL, and VENUS. In addition, first results with the new hadronic interaction model neXus 2 are discussed. Differences of the model predictions, both among ...

The ground states of charmed baryons form an antitriplet and sextet representations of the SU(3) group. The s-wave interaction of the latter with the octet of Goldstone bosons is predicted by the chiral properties of QCD. The Clebsch-Gordon coefficients that describe the relative interaction strength of the various channels reflect the SU(3) multiplet structure of the hadron the Goldstone boson...

The hadron production mechanism in particle collisions is one of the important subjects in the study of strong interaction. In standard model (QCD), hadronization processes belong to a nonperturbative problem for which no practicable calculation is available. Some phenomenological hadronization models were built up, which play important roles in the studies toward the final understanding of str...

We explore the implications for hadron spectroscopy of the "standard" gauge model of weak, electromagnetic, and strong interactions. The model involves four types of fractionally charged quarks, each in three colors, coupling to massless gauge gluons. The quarks are confined within colorless hadrons by a long-range spinindependent force realizing infrared slavery. We use the asymptotic freedom ...

Electroweakly Interacting Massive Particles (EWIMPs), in other words, new massive particles that are charged under the electroweak interaction of Standard Model (SM), often predicted various physics models. EWIMPs probed at hadron collider experiments not only by observing their direct productions but also measuring quantum effects on Drell-Yan processes for SM lepton pair productions. Such kno...

Using the large hadron calorimeter of the KASCADE experiment, hadronic cores of extensive air showers have been studied. The hadron lateral and energy distributions have been investigated in order to study the reliability of the shower simulation program CORSIKA with respect to particle transport, decays, treatment of low–energy particles, etc. A good description of the data has been found at l...