Hunting a New Kind of Particle — the bcud Tetra quark : ||Archana Radhakrishnan|| скачать в хорошем качестве

Hunting a New Kind of Particle — the bcud Tetra quark : ||Archana Radhakrishnan||

Speaker: Archana Radhakrishnan, TIFR Mumbai. Title: Hunting a New Kind of Particle — the bcud Tetra quark Abstract: Physicists are beginning to discover “tetraquarks,” exotic particles built from four quarks instead of the usual two (mesons) or three (protons and neutrons). The suitable candidate is a particle that contains two heavy quarks (one charm, c, and one bottom, b) plus two light antiquarks (ū and đ). If it exists, this bcud tetraquark would be the first of its kind and would deepen our understanding of how quarks bind together. To search for the bcud tetraquark, we run super‑computer simulations of quantum chromodynamics (QCD) on a space‑time grid, a technique known as Lattice QCD. Using four separate data sets with slightly different grid spacings and sizes, we watched how a D meson (containing one charm one light quark) and B meson (containing one bottom and one light quark) interact. The key question is: do these two mesons interact together to form a stable tetraquark state? The answer appears to be yes. After carefully removing lattice artefacts, we see a bound state in both the scalar and axial‑vector channels. Thus our calculations predict a bcud tetraquark should form in nature. Confirming this particle experimentally would test QCD in a brand‑new regime, guide future searches at the LHC and Belle II, and help map the rich “periodic table” of multiquark bound states.