L. T. Handoko

A Comparative Study of the Decays

Using improved theoretical calculations of the decay form factors in the Light Cone-QCD sum rule approach, we investigate the decay rates, dilepton invariant mass spectra and the forward-backward (FB) asymmetry in the decays B → (K, K ∗ )l + l − (l ± = e ± , µ ± , τ ± ) in the standard model (SM) and a number of popular variants of the supersymmetric (SUSY) models. Theoretical precision on the differential decay rates and FB-asymmetry is estimated in these theories taking into account various parametric uncertainties. We show that existing data on B → Xsγ and the experimental upper limit on the branching ratio B(B → K ∗ µ + µ − ) provide interesting bounds on the coefficients of the underlying effective theory. We argue that the FB-asymmetry in B → K ∗ l + l − constitutes a precision test of the SM and its measurement in forthcoming experiments may reveal new physics. In particular, the presently allowed largetan β solutions in SUGRA models, as well as more general flavor-violating SUSY models, yield FB-asymmetries which are characteristically different from the corresponding ones in the SM.

B \to (K,K^*) \ell^+ \ell^-

We study the implications of a large νμ–ντ mixing angle on flavour changing transitions of quarks and leptons in supersymmetric extensions of the standard model. Two patterns of supersymmetry breaking are considered, models with modular invariance and the standard scenario of universal soft breaking terms at the GUT scale. The analysis is performed for two symmetry groups G⊗U(1)F, with G=SU(5) and G=SU(3)3, where U(1)F is a family symmetry. Models with modular invariance are in agreement with observations only for restricted scalar quark and gaugino masses, Mq2/mg2≃7/9 and mb>350 GeV. A characteristic feature of models with large tanβ and radiatively induced flavour mixing is a large branching ratio for μ→eγ. For both symmetry groups and for the considered range of supersymmetry breaking mass parameters we find BR(μ→eγ)>10−14.

in Standard Model and Supersymmetric Theories

We present a complete set of generators for the rank 5 special unitary group, SU(6), to unify strong, weak and electromagnetic interactions. The unification is realized through the breaking pattern of SU(6){yields}SU(3){sub C}xSU(3){sub H}xU(1){sub C} followed by SU(3){sub H}{yields}SU(2){sub L}xU(1){sub B}. All known elementary particles and its quantum numbers are well accommodated in its {l_brace}6{r_brace} and {l_brace}15{r_brace} multiplets. These multiplets require a new neutral fermion which should be assigned as the heavy Majorana neutrino to realize the seesaw mechanism naturally.

NEUTRINO MIXING AND FLAVOUR CHANGING PROCESSES

The dynamics of Davydov-Scott monomer in a thermal bath with higher order amide-sites displacement leads to anharmonic oscillation effect is investigated using full-quantum approach and the Lindblad formulation of master equation. The specific heat is calculated based on the thermodynamic partition function using the path integral method. The temperature dependence of the specific heat is studied. In the model the specific heat anomaly as pointed out in recent works by Ingold [Phys. Rev. E 79, 061105 (2009)] is also observed. However, it is found that the anomaly occurs at high-temperature region, and the anharmonic oscillation restores the positivity of specific heat.

Grand unified theory based on the SU(6) symmetry

The impact of various types of external potentials to the Peyrard-Bishop DNA denaturation is investigated through statistical mechanics approach. The partition function is obtained using transfer integral method, and further the stretching of hydrogen bond is calculated using time independent perturbation method. It is shown that all types of external potentials accelerate the denaturation processes at lower temperature. In particular, it is argued that the Gaussian potential with infinitesimal width reproduces a constant force at one end of DNA sequence as already done in some previous works.

Anharmonic oscillation effect on the Davydov-Scott monomer in a thermal bath

We argue that one can search for physics beyond the standard model through measurements of the isospin-violating quantity � −0 ≡ ( B − → ρ − γ)/2( B 0 → ρ 0 γ)−1, its charge conjugate � +0 , and direct CP violation in the partial decay rates of B ± → ρ ± γ. We illustrate this by working out theoretical profiles of the charge-conjugate averaged ratio � ≡ 1 (� +0 + � −0 ) and the CP asymmetry ACP(B ± → ρ ± γ) in the standard model and in some variants of the minimal supersymmetric standard model. We find that chargino contributions in the large tan β region may modify ¯ (t)

The thermal denaturation of the Peyrard?Bishop model with an external potential

Abstract The impact of the damping effect and external forces on DNA breathing is investigated within the Peyrard–Bishop model. In the continuum limit, the dynamics of the breathing of DNA is described by the forced-damped nonlinear Schrodinger equation and studied by means of the variational method. The analytical solutions are obtained for special cases. It is shown that the breather propagation is decelerated in the presence of a damping factor without the external force, while the envelope velocity and the amplitude increase significantly with the presence of external force. It is particularly found that the higher harmonic terms are enhanced when the periodic force is applied. It is finally argued that the external force accelerates the DNA breathing.

Supersymmetric effects on isospin symmetry breaking and direct CP violation in B ---> rho gamma

The internal motions of DNA immersed in bio-fluid are investigated. The interactions between the fragments of DNA and the surrounding bio-fluid are modeled using the gauge fluid lagrangian. In the model, the bio-fluid is coupled to the standard gauge invariant bosonic lagrangian describing the DNA. It is shown that at non-relativistic limit various equation of motions, from the well-known Sine-Gordon equation to the simultaneous nonlinear equations, can be constructed within a single framework. The effects of bio-fluid are investigated for two cases : single and double stranded DNA. It is argued that the small and large amplitudes of a single stranded DNA motion immersed in bio-fluid can be explained in a natural way within the model as a solitonic wave regardless with the fluid velocity. In contrary the double stranded DNA behaves as regular or damped harmonic oscillator and is highly depending on the fluid velocity.

Dynamics of DNA breathing in the Peyrard–Bishop model with damping and external force

A novel approach to analyze statistically the network traffic raw data is proposed. The huge amount of raw data of actual network traffic from the Intrusion Detection System is analyzed to determine if a traffic is a normal or harmful one. Using the active ports in each host in a network as sensors, the system continuously monitors the incoming packets, and generates its average behaviors at different time scales including its variances. The average region of behaviors at certain time scale is then being used as the baseline of normal traffic. Deploying the exhaustive search based decission system, the system detects the incoming threats to the whole network under supervision.

The effects of bio-fluid on the internal motion of DNA

The magnetofluid unification is constructed using lagrangian approach by imposing a non-Abelian gauge symmetry to the matter inside the fluid. The model provides a general description for relativistic fluid interacting with either Abelian or non-Abelian gauge field. The differences with the hybrid magnetofluid model are discussed, and some physical consequences of this formalism are briefly worked out.