In this article, we take the point of view that the strange-bottomed (0, 1) mesons Bs0 and Bs1 are the conventional bs̄ mesons, and calculate the electromagnetic coupling constants d, g1, g2 and g3 with the light-cone QCD sum rules. Then we study the radiative decays Bs0 → B sγ, Bs1 → Bsγ, Bs1 → B sγ and Bs1 → Bs0γ, and observe the decay widths are rather narrow. We can search the strange-bottom...

A SU(4) flavor symmetrical Lagrangian is constructed for the interaction of the pseudo-scalar mesons with the vector mesons. SU(4) symmetry is broken to SU(3) by suppression of terms in the Lagrangian where the interaction should be driven by charmed mesons. Chiral symmetry can be restored by setting this new SU(4) symmetry breaking parameters to zero. Unitarization in coupled channels leads to...

In this short review the results of detailed studies for dilepton production from p + A and A + A reactions at SIS energies are presented. The calculations are based on a semi-classical BUU transport model that includes the off-shell propagation of vector mesons and evaluates the width of the vector mesons dynamically. Different scenarios of in-medium modifications of vector mesons, such as col...

The 0 glueball in pure gauge theory is a well defined quantity that can be used to test our understanding and ability to solve theory. It is also interesting to understand how, or if, the 0 glueball contributes to the physical light flavour singlet 0 mesons. Finding glueball degrees of freedom in the flavour singlet mesons is complicated, because other non-perturbative objects such as tetraquar...

We performed a calculation of matrix elements of heavy mesons on a quenched lattice, generated with Wilson gauge fields at β = 6.6 with a lattice size of 403 ×80 and a lattice spacing a−1 ≃ 5 GeV determined from the Sommer parameter r0 = 0.5 fm. We use a non-perturbatively O(a) improved Wilson fermion action and improved currents. We have calculated the charmonium spectrum as well as form facto...