1,059 research outputs found
Testing the Rule with Exclusive Semi-Leptonic Kaon Decays
We consider the possibility of violations of the selection rule at an appreciable level in {\it exclusive} semi-leptonic decays of
Kaons. At -Factories, intense Kaon beams will be available and will probe
among others, the semi-leptonic decays and in addition
to and could provide novel testing grounds for the
rule. In particular, the branching ratio of is non-negligible
and could be used to probe new phenomena associated with the violation of this
selection rule. Furthermore, we modify certain di-lepton event rate ratios and
asymmetries and time asymmetries that have been constructed by Dass and Sarma
for di-lepton events from Beon decays to test the at the
, to the Kaon system at the . We find that the large
width of the relative to that of plays an important role in
enhancing some of the time asymmetries.Comment: 10 pages, Plain Latex, To be run twice
String-like behaviour of 4d SU(3) Yang-Mills flux tubes
We present here results on the fine structure of the static q\bar q potential
in d=4 SU(3) Yang-Mills theory. The potential is obtained from Polyakov loop
correlators having separations between 0.3 and 1.2 fermi. Measurements were
carried out on lattices of spatial extents of about 4 and 5.4 fermi. The
temporal extent was 5.4 fermi in both cases. The results are analyzed in terms
of the force between a q\bar q pair as well as in terms of a scaled second
derivative of the potential. The data is accurate enough to distinguish between
different effective string models and it seems to favour the expression for
ground state energy of a Nambu-Goto string.Comment: 9 pages in LaTeX with 2 figures and 2 tables in JHEP style. Replaced
to match with shortened published versio
The confining string beyond the free-string approximation in the gauge dual of percolation
We simulate five different systems belonging to the universality class of the
gauge dual of three-dimensional random percolation to study the underlying
effective string theory at finite temperature. All the data for the finite
temperature string tension, when expressed by means of adimensional variables,
are nicely described by a unique scaling function. We calculate the first few
terms of the string tension up to order and compare to different
theoretical predictions. We obtain unambiguous evidence that the coefficients
of and terms coincide with those of the Nambu-Goto string, as
expected, while the term strongly differs and is characteristic of the
universality class of this specific gauge theory.Comment: 13 pages, 3 figure
The Effects of Flame Retardants on Combustion of Some Tropical Woods
Penta-erythritol, melamine and diammonium hydrogen orthophosphate were doped into emulsion paint and painted into some tropical woods that are commonly used for building, furniture, and other construction. These woods are Daniellia oliveri, Anogeissus leiocarpa, Mansonia altissima and Vitex doniana. The woods were also doped with a combination of urea fertilizer and alum dissolved in water. Paint formulations were prepared by using a combination of penta-erythritol, melamine and diammonium hydrogen orthophosphate and alone with gypsum. Some woods were painted with the formulations. The flame retardation effects of each of these formulations on the combustion of these tropical woods were determined through the following combustion parameters; ignition time, flame time, after glow, char length, flame propagation rate, moisture content and percent add-on. It was observed that the flame retardants really had retardation effect on the combustion of these tropical woods. The order of the degree of their retardation effects, a combination of urea fertilizer and alum is the highest, followed by paint mixed with gypsum and lastly, paint doped with penta-erythritol, melamine and diammonium hydrogen orthophosphate. Keywords: Flame retardants, wood, combustion, paint, perservative
Effects of Possible Transitions in Neutral Meson Decays}
We explore the possibility that the existing data on like-sign dileptons at
the resonance consist of events arising from mixing and also from transitions. The
consequences of these nonstandard transitions for certain time-asymmetries
which are likely to be measured at the factories are studied.Comment: {\LARGE \bf 10 pages, no figures, process using latex, TIFR/TH/93-5
Knowledge, attitude, perceptions and assessment of effectiveness of educational intervention on Pharmacovigilance among undergraduate medical students at Gulbarga Institute of Medical Sciences, Kalaburagi, India
Background: The Study was designed to assess the awareness of Pharmacovigilance and to evaluate the impact of an educational intervention.Methods: This was a questionnaire-based pre- and post-test educational interventional study. Students were given handouts containing information about pharmacovigilance one month before the educational intervention. A pre-validated 20-point questionnaire on (KAP) Knowledge, attitude, perception about Pharmacovigilance was distributed to second year medical students (n=115). An interactive educational intervention (Power point presentation) was designed. The chi-square test and unpaired paired t-test was used for statistical calculation.Results: The overall response rates were expressed as percentages, Mean±SD. The knowledge, attitude and perceptions of pharmacovigilance when compared before (pre-KAP) and after (post-KAP) the educational intervention, the correct response rates were found to be statistically significant (P<0.001). The feedback from the students was encouraging, handouts before the lecture classes helped them to easily grasp the pharmacovigilance concepts better during lectures.Conclusions: The study concluded that imparting the knowledge about pharmacovigilance and ADR reporting promotes drug safety and rational use of medicines in future
Detecting new physics contributions to the D0-D0bar mixing through their effects on B decays
New physics effects may yield a detectable mass difference in the D0-D0bar
system, Delta m_D. Here we show that this has an important impact on some B -->
D decays. The effect involves a new source of CP violation, which arises from
the interference between the phases in the B --> D decays and those in the
D0-D0bar system. This interference is naturally large. New physics may well
manifest itself through Delta m_D contributions to these B decays.Comment: 10 pages, Revtex, no figures. To appear in PR
CP Violation and Lifetime Differences of Neutral B Mesons from Correlated B^0-B^0bar Pairs
We present a technique to determine the CP violating phases, as well as, the
lifetime differences of the mass eigenstates for both and , by
considering correlated pairs produced at the resonances.
We do not require a detailed time dependent study, but only partial time
integrated rates, with the tag time, either preceding or following the decay of
the other meson to a final state f. f may be a CP eigenstate or a non-CP
eigenstate.Comment: 11 Pages Revte
High precision Monte Carlo simulations of interfaces in the three-dimensional Ising model: a comparison with the Nambu-Goto effective string model
Motivated by the recent progress in the effective string description of the
interquark potential in lattice gauge theory, we study interfaces with periodic
boundary conditions in the three-dimensional Ising model. Our Monte Carlo
results for the associated free energy are compared with the next-to-leading
order (NLO) approximation of the Nambu-Goto string model. We find clear
evidence for the validity of the effective string model at the level of the NLO
truncation.Comment: 20 pages, 1 figur
Quantum Tests of the Foundations of General Relativity
The role of the equivalence principle in the context of non-relativistic
quantum mechanics and matter wave interferometry, especially atom beam
interferometry, will be discussed. A generalised form of the weak equivalence
principle which is capable of covering quantum phenomena too, will be proposed.
It is shown that this generalised equivalence principle is valid for matter
wave interferometry and for the dynamics of expectation values. In addition,
the use of this equivalence principle makes it possible to determine the
structure of the interaction of quantum systems with gravitational and inertial
fields. It is also shown that the path of the mean value of the position
operator in the case of gravitational interaction does fulfill this generalised
equivalence principle.Comment: Classical and Quantum Gravity 15, 13 (1998
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