Weak-decay searches for $$Qs{\bar{u}}{\bar{d}}$$ tetraquarks

Weak Decay of

Weak decay of hypernuclei

The nonmesonic weak decay of L hypernuclei is studied in a shell model framework. A complete strangeness-changing weak LN→NN transition potential, based on one boson exchange, is constructed by including the exchange of the pseudoscalar mesons p , K , h as well as the vector mesons r ,v , and K*, whose weak-coupling constants are obtained from soft meson theorems and SU~6!w . General expression...

Weak decay of hypernuclei

The focus of these lectures is on the weak decay modes of hypernuclei, with special attention to Λ–hypernuclei. The subject involves many fields of modern theoretical and experimental physics, from nuclear structure to the fundamental constituents of matter and their interactions. The peculiar behaviour of matter containing strange quarks has raised in recent years many interesting problems, on...

Hyperspherical harmonic formalism for tetraquarks

We present a generalization of the hyperspherical harmonic formalism to study systems made of quarks and antiquarks of the same flavor. This generalization is based on the symmetrization of the N−body wave function with respect to the symmetric group using the Barnea and Novoselsky algorithm. Our analysis shows that four-quark systems with non-exotic 2 quantum numbers may be bound independently...

Searches for New Particles Produced in 2 Boson Decay

Searches for events with new particle topologies in 455 hadronic 2 decays with the Mark II detector at SLC are presented. 95% confidence level lower limits of 40.7 GeV/c2 for the top quark mass and 42.0 GeV/c2 for the mass of a fourth generation charge-l/3 quark, regardless of decay mode, are obtained. For a fourth generation sequential Dirac neutrino ~4, a significant range of mixing matrix el...