It is possible that under certain situations, in a relativistic heavy-ion collision, partons may expand out forming a shell like structure. We analyze the process of hadronization in such a picture for the case when the quark-hadron transition is of first order, and argue that the inside region of such a shell must correspond to a supercooled (to T = 0) deconfined vacuum. Hadrons from that regi...

We relate here the vacuum structure of chiral symmetry breaking to a wide class of low energy hadronic properties to examine consistency with experimental results. Phase transition of chiral symmetry breaking is described through explicit vacuum realignment. We find that for the present ansatz, vacuum structure of the light quark sector can be determined from f π = 92 MeV, which then yields tha...

We compute the strong coupling constant gP ∗Pπ, with P and P ∗ respectively pseudoscalar and vector heavy mesons by using the QCD sum rules approach. Our computation is based on the evaluation of the time ordered product of currents between the vacuum and the soft pion state. The so-called parasitic terms are taken into account and give a contribution to the sum rule of the same order of the lo...

We describe in detail the calculation of the two-loop corrections to the QED Bhabha scattering cross section due to the vacuum polarization by heavy fermions. Our approach eliminates one mass scale from the most challenging part of the calculation and allows us to obtain the corrections in a closed analytical form. The result is valid for arbitrary values of the heavy fermion mass and the Mande...

The mass matrices of charged fermions have a simple structure if expressed in powers of the small parameter σ = (mc/mt) 1/2. It is suggested that the mass matrix of the three heavy neutrinos occuring in grand unified theories can be expressed in terms of the same parameter. The requirement that these heavy neutrinos carry different U(1) generation quantum numbers gives rise to an almost unique ...

The spectrum of the 0++, 0−−, 1−+ and 1+− heavy-light hybrids have been calculated in HQET. The interpolated current of the hybrid is chosen as gq̄γαG a αμT hv (x), gq̄γαγ5G a αμT hv (x) and gq̄σμαG a αμT hv (x). Some strong couplings and decay widths of the heavy-light hybrids to B(D)π are calculated by using the QCD sum rules. The mass of 0++ hybrid with gluon in TM(1−−) or TE(1+−) mode is found...