meson

CERN, the European Organization for Nuclear Research, announced in Switzerland this morning that researchers on two separate LHC experiments succeeded in measuring the decay of B-subscript-s mesons into two muons.

Seventeen contributions describe the early history of CP violation theory; discuss experiments on CP violation with K and B mesons; discuss the measurement of leptonic CP violation in future neutrino facilities; examine CP violation in cosmology; and consider B physics at hadron colliders, among other topics.

The first step is to map QCD to an effective theory expressed in terms of the important degrees of freedom of low energy QCD, mesons and nucleons.

By now it was well established that quarks (see 1961) combine two at a time (a quark and an anti-quark) to form mesons and three at a time to form protons, neutrons, and other hadrons.

Thanks to the fruitful running of the B factories and Large Hadron Collider (LHC) in the past years, most of the [B.sub.u,d] mesons decays with branching fractions [??] O([10.sup.-7]) have been measured.

So, while the DZero collaboration spotted an excess 133 pairs of BS mesons and pi mesons - produced when X(5568) decays - the CERN scientists spotted none.

All of these particles fall into two categories: mesons, which contain two quarks, and baryons (including protons and neutrons), which contain three.

Mesons are part of a large family of particles made up of the fundamental particles known as quarks.

Further we will investigate the distribution of hadrons (baryons and mesons) in dependence on their rest masses.

of Munich, Germany) explains elementary particles, specifically the discoveries of scientists concerning electrons and atomic nuclei, the quantum properties of atoms and particles, quarks, particle accelerators, quantum electrodynamics and chromodynamics, mesons and baryons, electroweak interactions, and grand unification.

On the theoretical side, calculations based on W and Z exchange between quarks are notoriously unreliable in the hadronic sector at low energies, where quarks are unavoidably bound by the strong interaction into nucleons and mesons. On the experimental side, studies of the weak nucleon-nucleon interaction are confined to measurements of parity-violating observables which constitute a unique but usually tiny signature of the weak interaction.