We briefly review the status of various conventional quark-antiquark mesons below 2 GeV and outline some open questions: strangeantistrange orbitally excited vector meson, nonet axial-tensor (chiral partners well known tensor mesons), isoscalar mixing angle in pseudotensor sector, which can eventually represent a novel manifestation chiral anomaly.

The effect of the interaction mesons in final state is additionally considered within description [Formula: see text] decays. This taken into account at level production intermediate pions. One them, turn, might be transited or mesons. Our results do not exceed experimentally established branching fractions, and they are agreement with other theoretical studies.

We compute the potential between a pair of nucleons in the D4-D8 holographic QCD. In the large ’t Hooft coupling limit, λ ≫ 1, the hadronic size of the baryon is small ∼ 1/ √ λMKK , and their interaction with mesons are well approximated by a set of dimension four and five operators. The nucleon-nucleon potential emerges from one-boson exchange picture involving massless pseudo-scalars and an i...

Measurement of leptonic and hadronic decays of ω-and φ-mesons at RHIC by PHENIX Abstract. The PHENIX experiment at RHIC measured production of the ω-and φ-mesons in p + p, d + Au and Au + Au collisions at √ s N N = 63 and 200 GeV. Particle properties were studied using hadronic and di-electron decay channels. Transverse momentum (mass) spectra measured in different decay modes are found to be i...

We perform a Faddeev calculation for the three mesons system, φKK̄, taking the interaction between two pseudoscalar mesons and between a vector and a pseudoscalar meson from the chiral unitary approach which generates dynamically the low lying scalar mesons in the first case and the low lying axial vector mesons in the second. We obtain a neat resonance peak around a total mass of 2150 MeV and a...

Many of the XYZ mesons discovered in the last decade can be identified as bound states of a heavy quark and antiquark in Born-Oppenheimer (BO) potentials defined by the energy of gluon and light-quark fields in the presence of static color sources. The mesons include quarkonium hybrids, which are bound states in excited flavor-singlet BO potentials, and quarkonium tetraquarks, which are bound s...

A recent renormalization group analysis of the effective light-cone Hamiltonian yields 5 flavor masses and 2 mass shifts as free parameters. These are determined in the present note and used to calculate the masses of all 30 physical mesons (The topped mesons have been omitted). The agreement between experiment and theoretical estimate is quite satisfactory over the whole dynamical range, from ...

The mass spectrum of S and P-wave mesons containing a single heavy quark is computed in the quenched approximation, using NRQCD up to third order in the inverse heavy quark mass expansion. Previous results found the expansion to break down near the charm quark mass for the S-wave spin splitting. The present work considers variations such as anisotropic lattices, Landau link tadpole improvement,...

We analyze the properties of mesons in 1+1 dimensional QCD with bosonic and fermionic “quarks” in the large Nc limit. We study the spectrum in detail and show that it is impossible to obtain massless mesons including boson constituents in this model. We quantitatively show how the QCD mass inequality is realized in two dimensional QCD. We find that the mass inequality is close to being an equal...