Kamaluddin Ahmed

Lepton polarization asymmetry in B→l+l- decays in R-parity–violating minimal supersymmetric standard model

We study the implications of R-parity-violating () Minimal Supersymmetric Standard Model (MSSM) in lepton polarization asymmetry (ALP) in B→l+l- decays. The analysis shows that the ALP is significant only in a certain phenomenological parametric region of Yukawa coupling products and branching fraction. The analysis further shows how tanβ arising from type-II Higgs Doublet Model (2HDM) is constrained in the presence of Yukawa interactions.

Search for a signal on QCD critical point in central nucleusnucleus collisions

We discuss that the QCD critical point could appear in central collisions in percolation cluster. We suggest to use the effects of nuclear transparency and that of the light nuclear production to identify the critical point.

SOME PROPERTIES OF THE CENTRAL π--MESON CARBON INTERACTIONS AT 40 GeV/c

We discuss some properties of the central π--meson carbon reactions at 40 GeV/c. While these results were obtained many years ago they have not been explained completely. We attempt to interpret following: results regime change on the behavior of some characteristics of the events as a function of the centrality; anomaly peak on the angular distributions of the slow protons emitted in these reactions; charge asymmetry on the π--mesons production in the back hemisphere in lcs. Understanding of the results could help to explain the new ones coming from the modern central experiments at high and ultrarelativistic energies.

Search for deconfinement in the cluster at ultrarelativistic heavy ion collisions

Some of the centrality experiments indicate regime change and saturation in the behavior of characteristics of the secondary particles. It is observed as a critical phenomenon for hadron-nuclear, nuclear-nuclear interactions and ultrarelativistic heavy ion collisions. The existing simple models do not explain the effect. We believe that the responsible mechanism to explain the phenomena could be the percolation cluster formation and expect appearance of deconfinement in the cluster.

IMPLOSION DYNAMICS OF HIGH-DENSITY FIBER PLASMA DRIVEN BY IMPLODING MULTICASCADE LINER

The dynamics of a high density D-T fiber plasma driven by a multi cascade system (N multiple shells of finite thicknesses) has been investigated with a view to suppress Rayleigh–Taylor (R–T) instability. Our numerical results show that the plasma parameters of the D-T fiber sensitively depends upon the shell mass ratios and thicknesses. Large values of puff-thickness and mass-ratios provide stabilization against the R–T instability in the final stage of compression but adversely affect fusion conditions. Our analysis, however, suggests that optimum values of the puff-thicknesses and mass ratios are needed to achieve fusion parameters in a multi cascade liner staged Z-pinch devices. The relevance of our present investigation to ultra high magnetic fluxes, X-ray lasers as well as controlled thermonuclear fusion is also pointed out.

Study of plasma parameters in a staged pinch device using current-stepping technique

The implosion dynamics and fusion parameters of a high density D-T fibre plasma driven by Z-pinch with current stepping technique is investigated. Our numerical results demonstrate that a current-stepping technique reduces the minimum pinch radius, and as a result high density, high temperature plasma can be formed. Thus a staged pinch device with current-stepping technique can be used as an alternative approach to achieve fusion conditions with relatively small values of discharge current and with a long pulse duration.