Searching for new physics in the angular distribution of B^0 -> phi K^* decay

Motivated by the possible discrepancy between the observed CP asymmetry and that of standard model expectation in the decay mode B^0 -> phi K_S, we study the corresponding vector vector decay mode B^0 -> phi K^*. In order to obtain decisive information regarding the CP violating effect, we made the angular distribution analysis of the decay products, where both the outgoing vector mesons decay into two pseudoscalars. Furthermore, we study the possible effects of new physics using the angular distribution observables.Comment: LaTex, 16 pages, 1 figur

Explaining B \to K pi anomaly with non-universal Z' boson

We study the effect of non-universal $Z'$ boson in the decay modes $B \to K \pi$. In the standard model these modes receive dominant contributions from $b \to s$ QCD penguins. Therefore, in this limit one expects $S_{\pi^0 K^0} \approx \sin 2 \beta$, $A_{\pi^0 K^0} \approx 0$ and $A_{\pi^0 K^-} \approx A_{\pi^+ K^-}$. The corrections due to the presence of small non-penguin contributions is found to yield $S_{\pi^0 K^0} > \sin 2 \beta$ and $\Delta A_{CP}(K \pi) \simeq 2.5$. However, the measured value of $S_{\pi^0 K^0}$ is less than $\sin 2 \beta$ and $\Delta A_{CP}(K \pi) \simeq 15$. We show the model with a non-universal $Z'$ boson can successfully explain these anomalies.Comment: 11 pages, 3 figure

Numerical Simulations of a Two Component Advective Flow for The Study of the Spectral and Timing Properties of Black Holes

Two component advective flows are the most physical accretion disks which arise from theoretical consideration. Since viscosity is the determining factor, we investigate the effects of viscous stresses on accretion flows around a nonrotating black hole. As a consequence of angular momentum transfer by viscosity in an accretion flow, the angular momentum distribution is modified. We include cooling effects and found that a Keplerian disk is produced on the equatorial plane and the flow above and below remains sub Keplerian. This gives a complete picture to date, of the formation of a Two component advective flow around a black hole.Comment: 3 pages, 2 figures, 13th Marcel Grossmann Meeting Conference Proceedings, Stockholm University, Swede