Estimates of long-distance contributions to the Bs→γγ decay

Estimates of Long - distance Contributions to the B s → γγ Decay

We present first calculations of new long-distance contributions to Bs → γγ decay due to intermediate Ds and D ∗ s meson states. The relevant γ vertices are estimated using charge couplings and transition moment couplings. Within our uncertainties, we find that these long-distance contributions could be comparable to the known short-distance contributions. Since they have different Cabibbo-Koba...

Decay estimates of solutions to the IBq equation

‎In this paper we focus on the Cauchy problem for the generalized‎ ‎IBq equation with damped term in $n$-dimensional space‎. ‎We establish the global existence and decay estimates of solution with $L^q(1leq qleq 2)$ initial value‎, ‎provided that the initial value is suitably small‎. ‎Moreover‎, ‎we also show that the solution is asymptotic to the solution $u_L$ to the corresponding linear equa...

Long-distance contributions to the QCD pressure

The QCD pressure is a most fundamental quantity, for which lattice data is available up to a few times the critical temperature Tc. Perturbation theory, even at very high temperatures, has serious convergence problems. Combining analytical and 3d numerical methods, we show that it is possible to compute the QCD pressure from about 2Tc to infinity. We also describe an algorithm to generate and c...

Long – distance contributions to the K L → μ + μ − decay width

Resumming Long-Distance Contributions to the QCD Pressure.

The strict coupling constant expansion for the free energy of hot QCD plasma shows bad convergence at all reasonable temperatures, and does not agree well with its 4D lattice determination. This has recently led to various refined resummations, whereby the agreement with the lattice result should improve, at the cost of a loss of a formal agreement with the coupling constant expansion and parti...