TO THE QUESTION OF THE EXISTENCE OF CENTAURS - EVENTS IN COSMIC RAYS

One of the first exotic phenomena observed in the 80s of the last century was an event registered by a calorimetric type installation. In this event, an anomalous relationship was observed between charged and neutral hadrons, arising from the collision of a high-energy particle with a carbon nucleus. In accordance with the principle of isotopic invariance, the number of neutral pions should be equal to the number of charged pions. The event, which was recorded by Japanese physicists, contained only charged peonies with no neutral [1]. This event was named "Centaur". Until now, such events have not been observed in accelerator experiments. The article presents the results of searching for such events in experiments at the DESY HERA collider. For the candidates for Centaur events and for all other events, constructed distributions by the type of fitability of charged tracks in CTD. Since the absence of neutral particles in events is explained by methodological reasons, "Centaur" events were not detected in electron-proton interactions at the ZEUS facility.

Investigation of isospin forbidden 0+ → 0+ Fermi beta decays with Pyatov method

In the present work, the matrix elements, isospin impurities and log ft values of the isospin forbidden 0+ → 0+ beta decays have been investigated. The calculated results have been compared with available experimental and another theoretical data. The isotopic invariance of the Hamiltonian has been restored by Pyatov method. Within the quasi-particle random phase approximation (QRPA), the computations have been performed both in presence and absence of the pairing interactions.

REACTIONS γγ→K+K− AND $\gamma \gamma \to K^0 \bar K^0 $ NEAR THRESHOLD

The absence of the large Born term contribution found experimentally near the γγ→ K+K− reaction threshold is discussed. There are, at least, two reasons of the Born term suppression: i) the presence of a form factor and ii) the compensation of the Born term by the contributions from a0(980) and f0(975) resonances strongly coupled to the [Formula: see text] channel. This compensation is a natural consequence of the unitarity condition. In its turn, the isotopic invariance guarantees a cancellation of the a0(980) and f0(975) contributions in [Formula: see text]