Some Novel Contributions to Radiative B Decay in Supersymmetry without R-parity

We present a systematic analysis at the leading log order of the influence of combination of bilinear and trilinear R-parity violating couplings on the decay b-->s gamma. Such contributions have never been explored in the context of this decay. We show that influence of charged-slepton-Higgs mixing mediated loops can dominate the SM and MSSM contributions and hence can provide strong bounds on the combination of bilinear-trilinear R-parity violating couplings. Such contributions are also enhanced by large tan beta. With substantially extended basis of operators (28 operators), we provide illustrative analytical formulae of the major contributions to complement our complete numerical results which demonstrate the importance of QCD running effects.Comment: 4 pages, 2 figure

Quark Loop Contributions to Neutron, Deuteron, and Mercury EDMs from Supersymmetry without R parity

We present a detailed analysis of the neutron, deuteron and mercury electric dipole moment from supersymmetry without R parity, focusing on the quark-scalar loop contributions. Being proportional to top Yukawa and top mass, such contributions are often large. Analytical expressions illustrating the explicit role of the R-parity violating parameters are given following perturbative diagonalization of mass-squared matrices for the scalars. Dominant contributions come from the combinations $B_i \lambda^{\prime}_{ij1}$ for which we obtain robust bounds. It turns out that neutron and deuteron EDMs receive much stronger contributions than mercury EDM and any null result at the future deuteron EDM experiment or Los Alamos neutron EDM experiment can lead to extra-ordinary constraints on RPV parameter space. Even if R-parity violating couplings are real, CKM phase does induce RPV contribution and for some cases such a contribution is as strong as contribution from phases in the R-parity violating couplings.Hence, we have bounds directly on $|B_i \lambda^{\prime}_{ij1}|$ even if the RPV parameters are all real. Interestingly, even if slepton mass and/or $\mu_0$ is as high as 1 TeV, it still leads to neutron EDM that is an order of magnitude larger than the sensitivity at Los Alamos experiment. Since the results are not much sensitive to $\tan \beta$, our constraints will survive even if other observables tighten the constraints on $\tan \beta$.Comment: 16 pages, 10 figures, accepted for publication in Physical Review

CP violation in the mass matrix of heavy neutrinos

We discuss the question of CP-violation in the effective Hamiltonian approach in models of leptogenesis through heavy right handed neutrino decays. We first formulate the problem in four component notation and then point out that before the heavy neutrinos have decayed away, the universe becomes CP-asymmetric in the heavy neutrinos. However, the lepton asymmetry generated after they completely decay are independent of this asymmetry.Comment: 9 pages latex file, minor change

Development and validation of a novel RP-HPLC method for the simultaneous quantification of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol in a polyherbal formulation

307-311A novel, accurate, precise, and linear RP-HPLC method for the simultaneous estimation of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol in a polyherbal formulation was developed and validated as per ICH guidelines. A good chromatographic separation was achieved using gradient profile with the help of Shim-pack RP-HPLC column (250 mm*4.6 mm, 5 µm) and a mobile phase consisting of acetonitrile and 1% acetic acid was used. The column temperature was maintained at 28 °C throughout the run with a wavelength of 272 nm using UV-Visible detector. The retention time of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol was found to be 3.9, 6.7, 21.5, 44.6, and 45.9 min respectively. The linearity of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol was found to be in a range of 10-100, 5-50, 1-10, 5-50, and 2-20 µg/mL, respectively with correlation coefficient >0.99. The high recovery values (98-102%) indicate satisfactory accuracy. The % RSD values were found to be less than 2% in the precision study which reveals that the method is precise. Hence the developed method can be used for quality control and quantitative analysis of extracts and commercial containing these selected phytoconstituents

Development and validation of a novel RP-HPLC method for the simultaneous quantification of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol in a polyherbal formulation

A novel, accurate, precise, and linear RP-HPLC method for the simultaneous estimation of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol in a polyherbal formulation was developed and validated as per ICH guidelines. A good chromatographic separation was achieved using gradient profile with the help of Shim-pack RP-HPLC column (250 mm*4.6 mm, 5 µm) and a mobile phase consisting of acetonitrile and 1% acetic acid was used. The column temperature was maintained at 28 °C throughout the run with a wavelength of 272 nm using UV-Visible detector. The retention time of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol was found to be 3.9, 6.7, 21.5, 44.6, and 45.9 min respectively. The linearity of ascorbic acid, gallic acid, ferulic acid, piperine, and thymol was found to be in a range of 10-100, 5-50, 1-10, 5-50, and 2-20 µg/mL, respectively with correlation coefficient >0.99. The high recovery values (98-102%) indicate satisfactory accuracy. The % RSD values were found to be less than 2% in the precision study which reveals that the method is precise. Hence the developed method can be used for quality control and quantitative analysis of extracts and commercial containing these selected phytoconstituents

Flavor Changing Higgs Decays in Supersymmetry with Minimal Flavor Violation

We study the flavor changing neutral current decays of the MSSM Higgs bosons into strange and bottom quarks. We focus on a scenario of minimum flavor violation here, namely only that induced by the CKM matrix. Taking into account constraint from $b\to s \gamma$, $\delta\rho$ as well as experimental constraints on the MSSM spectrum, we show that the branching ratio of $(\Phi\to b\bar{s})$ and $(\Phi \to \bar{b}s)$ combined, for $\Phi$ being either one of the CP even Higgs states, can reach the order $10^{-4}$-$10^{-3}$ for large $\tan\beta$, large $\mu$, and large $A_t$. The result illustrates the significance of minimal flavor violation scenario which can induce competitive branching fraction for flavor changing Higgs decays. This can be compared with the previous studies where similar branching fraction has been reported, but with additional sources of flavor violations in squark mass matrices. We also discuss some basic features of the flavor violating decays in the generic case.Comment: 16 pages on Revtex, with 5 figures from 10 eps files incorporated; discussion on issues related more precise calculations elaborated; proof-edited version to appear in Phys. Lett.