Physics at SuperB

Flavour will play a crucial role in understanding physics beyond the Standard Model. Progress in developing a future programme to investigate this central area of particle physics has recently passed a milestone, with the completion of the conceptual design report for SuperB, a very high luminosity, asymmetric e+e- collider. This article summarizes the important role of SuperB in understanding new physics in the LHC era.Comment: 4 pages, 2 figures. To appear in the proceedings of the International Europhysics Conference on High Energy Physics (EPS-HEP2007), Manchester, England, 19-25 July 200

Detection of non-Gaussian Fluctuations in a Quantum Point Contact

An experimental study of current fluctuations through a tunable transmission barrier, a quantum point contact, are reported. We measure the probability distribution function of transmitted charge with precision sufficient to extract the first three cumulants. To obtain the intrinsic quantities, corresponding to voltage-biased barrier, we employ a procedure that accounts for the response of the external circuit and the amplifier. The third cumulant, obtained with a high precision, is found to agree with the prediction for the statistics of transport in the non-Poissonian regime.Comment: 4 pages, 4 figures; published versio

Scalable solid-state quantum processor using subradiant two-atom states

We propose a realization of a scalable, high-performance quantum processor whose qubits are represented by the ground and subradiant states of effective dimers formed by pairs of two-level systems coupled by resonant dipole-dipole interaction. The dimers are implanted in low-temperature solid host material at controllable nanoscale separations. The two-qubit entanglement either relies on the coherent excitation exchange between the dimers or is mediated by external laser fields.Comment: 4 pages, 3 figure

MODERN AGRICULTURE AND EMPLOYMENT GROWTH IN NIGERIA

Nigeria is blessed with abundant land resources, its agricultural land, has been increasing which means it has a higher advantage in boosting agricultural productivity and employment growth in the economy, but this potential is not being realized. This study is aimed at examining the impact modern agriculture on employment growth in Nigeria. The methodology adopted for the study is the Recursive Ordinary Least Square estimation method. The variables used in the model are: Foreign Direct Investment, Export, Export Price Index, Agricultural Value Added per Worker, Agricultural Output, Agricultural Machineries & Tractor, Agricultural Credit, Inflation Rate, Exchange Rate, Government Expenditure on Education and Employment Rate. Using time series data spanning from 1980 to 2014, the result shows; a significant and positive relationship between agricultural productivity growth and modern agriculture, a significant and negative relationship between export price index and agricultural productivity growth, a significant and positive relationship between export and investment, a significant and positive relationship between investment and employment growth. Based on the findings, the author suggests that government should pursue a balanced growth of both agricultural sector and industrial sector in order to ensure both forward and backward linkages between the two sectors for the overall development of Nigerian econom

MODERN AGRICULTURE AND EMPLOYMENT GROWTH IN NIGERIA

Nigeria is blessed with abundant land resources, its agricultural land, has been increasing which means it has a higher advantage in boosting agricultural productivity and employment growth in the economy, but this potential is not being realized. This study is aimed at examining the impact modern agriculture on employment growth in Nigeria. The methodology adopted for the study is the Recursive Ordinary Least Square estimation method. The variables used in the model are: Foreign Direct Investment, Export, Export Price Index, Agricultural Value Added per Worker, Agricultural Output, Agricultural Machineries & Tractor, Agricultural Credit, Inflation Rate, Exchange Rate, Government Expenditure on Education and Employment Rate. Using time series data spanning from 1980 to 2014, the result shows; a significant and positive relationship between agricultural productivity growth and modern agriculture, a significant and negative relationship between export price index and agricultural productivity growth, a significant and positive relationship between export and investment, a significant and positive relationship between investment and employment growth. Based on the findings, the author suggests that government should pursue a balanced growth of both agricultural sector and industrial sector in order to ensure both forward and backward linkages between the two sectors for the overall development of Nigerian economy

First determination of the CPCP content of D→π+π−π+π−D \to \pi^+\pi^-\pi^+\pi^- and updated determination of the CPCP contents of D→π+π−π0D \to \pi^+\pi^-\pi^0 and D→K+K−π0D \to K^+K^-\pi^0

Quantum-correlated $\psi(3770) \to D\bar{D}$ decays collected by the CLEO-c experiment are used to perform a first measurement of $F_+^{4\pi}$, the fractional $CP$-even content of the self-conjugate decay $D \to \pi^+\pi^-\pi^+\pi^-$, obtaining a value of $0.737 \pm 0.028$. An important input to the measurement comes from the use of $D \to K^0_{\rm S}\pi^+\pi^-$ and $D \to K^0_{\rm L}\pi^+\pi^-$ decays to tag the signal mode. This same technique is applied to the channels $D \to\pi^+\pi^-\pi^0$ and $D \to K^+K^-\pi^0$, yielding $F_+^{\pi\pi\pi^0} = 1.014 \pm 0.045 \pm 0.022$ and $F_+^{KK\pi^0} = 0.734 \pm 0.106 \pm 0.054$, where the first uncertainty is statistical and the second systematic. These measurements are consistent with those of an earlier analysis, based on $CP$-eigenstate tags, and can be combined to give values of $F_+^{\pi\pi\pi^0} = 0.973 \pm 0.017$ and $F_+^{KK\pi^0} = 0.732 \pm 0.055$. The results will enable the three modes to be included in a model-independent manner in measurements of the unitarity triangle angle $\gamma$ using $B^\mp \to DK^\mp$ decays, and in time-dependent studies of $CP$ violation and mixing in the $D\bar{D}$ system.Comment: Minor revisions following journal acceptanc

Measurement of Counting Statistics of Electron Transport in a Tunnel Junction

We present measurements of the time-dependent fluctuations in electrical current in a voltage-biased tunnel junction. We were able to simultaneously extract the first three moments of the tunnel current counting statistics. Detailed comparison of the second and the third moment reveals that counting statistics is accurately described by the Poissonian distribution expected for spontaneous current fluctuations due to electron charge discreteness, realized in tunneling transport at negligible coupling to environment.Comment: bibliography expande