RadiativeBdecays to the axialKmesons at next-to-leading order

Abstract

We calculate the branching ratios of B → K 1 γ at next-to-leading order (NLO) of α s where K 1 is the orbitally excited axial vector meson. The NLO decay amplitude is divided into the vertex correction and the hard spectator interaction part. The one is proportional to the weak form factor of B → K 1 transition while the other is a convolution between light-cone distribution amplitudes and hard scattering kernel. Using the light-cone sum rule results for the form factor, we have B(B 0 → K 0 1 (1270)γ) = (0.828 ± 0.335) × 10 −5 and B(B 0 → K 0 1 (1400)γ) = (0.393 ± 0.151) × 10 −5 .

Dynamical analysis of Brans–Dicke universe with inverse power-law effective potential

“…P B1 → P B9,10 → P B5,6 4. P B2 → P B9,10 → P B5, 6 We show also that these trajectories pass well from the radiationlike matter era to the dark energy-dominaed era (as ΛCDM cosmological model), as one can see in Figs. 3-5.…”

“…P A1 → P A5,6 2. P A2,3 → P A5, 6 It is shown that the paths in a phase space pass well from the radiation-like matter era to dark energy-dominated era of the Universe, as one can see in Figs. 1 and 2.…”

“…The variability 3 of the gravitational constant in this Brans-Dicke theory is given by |Ġ G | 0 ≈ 2.9 × 10 −10 /yr for P A5, 6 and |Ġ G | 0 ≈ 3.2 × 10 −11 /yr for P B5,6 , respectively, when the age of the Universe τ 0 = 1/H 0 ≈ 13.8 × 10 9 yr. These are consistent with the observational results given by [75].…”

“…The recent acceleration of our Universe is thought to be caused by the mysterious dark energy, which composes about 68% [1][2][3][4]. Roughly 27% of the Universe consists of dark matter [5,6] and the remainder ordinary matter. One of the simplest candidate for dark energy is the well-known cosmological constant.…”

Black holes from multiplets of scalar fields in 2 + 1- and 3 + 1 dimensions

“…Let's add that multiple field scalar-tensor has been studied before [8][9][10][11][12][13][14][15][16][17][18][19]. Triplet scalar field in the context of global monopole has been studied extensively in literature [20][21][22][23][24][25][26][27][28][29]. One has to keep in order that the single scalar field coupled with gravity has been studied more rigorously.…”