Electroweak Corrections to the Deacy H+→W+hH^+\to W^+h in the Minimal Supersymmetric Model

We calculate the $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew} m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the process $H^+\to W^+h$ in the Minimal Supersymmetric Model. These corrections arise from the virtual effects of the third family quaurks (top and bottom) and squarks (top-squark and bottom-squark). We find that for $m_{H^+}>200$GeV at low $\tan\beta(\leq 3)$, the corrections can increase the tree-level decay widths and the branching radios more than 20% and 40%, respectively.Comment: 20 pages, including 7 ps figure

High-ranked social science journal articles can be identified from early citation information

Do citations accumulate too slowly in the social sciences to be used to assess the quality of recent articles? I investigate whether this is the case using citation data for all articles in economics and political science published in 2006 and indexed in the Web of Science. I find that citations in the first two years after publication explain more than half of the variation in cumulative citations received over a longer period. Journal impact factors improve the correlation between the predicted and actual future ranks of journal articles when using citation data from 2006 alone but the effect declines sharply thereafter. Finally, more than half of the papers in the top 20% in 2012 were already in the top 20% in the year of publication (2006)

The Top Story

This is an overview of top quark search, with particular emphasis on the more recent results. After a brief introduction to the basic constituents of matter and their interactions, I shall discuss the indirect evidences for the existence of top quark and its mass from LEP and finally the direct observation of a top quark signal recently reported from the Tevatron collider. I shall try to put these results in perspective and provide some insight into the physics issues involved in the top quark search.Comment: 15 pages, 8 figures available on request. Based on the talks given at The Seminar on Recent Advances in Theoretical Physics, Hyderabad, 7-8 Apr 1995 and The Meeting on Particle Physics, Calcutta, 20-21 Apr 199

Top quark properties

The top quark physics has entered the precision era. The CDF and D0 collaborations are finalizing their legacy results of the properties of the top quark after the shutdown of the Fermilab Tevatron three years ago. The ATLAS and CMS collaborations have been publishing results from the LHC Run I with 7 TeV and 8 TeV proton-proton collisions, with many more forthcoming. We present a selection of recent results produced by the Tevatron and LHC experiments.Comment: Presented at XXXIV Physics in Collision Symposium, Bloomington, Indiana, September 16-20, 2014, 10 pages, 5 figure

Does Logarithm Transformation of Microarray Data Affect Ranking Order of Differentially Expressed Genes?

A common practice in microarray analysis is to transform the microarray raw data (light intensity) by a logarithmic transformation, and the justification for this transformation is to make the distribution more symmetric and Gaussian-like. Since this transformation is not universally practiced in all microarray analysis, we examined whether the discrepancy of this treatment of raw data affect the "high level" analysis result. In particular, whether the differentially expressed genes as obtained by $t$-test, regularized t-test, or logistic regression have altered rank orders due to presence or absence of the transformation. We show that as much as 20%--40% of significant genes are "discordant" (significant only in one form of the data and not in both), depending on the test being used and the threshold value for claiming significance. The t-test is more likely to be affected by logarithmic transformation than logistic regression, and regularized $t$-test more affected than t-test. On the other hand, the very top ranking genes (e.g. up to top 20--50 genes, depending on the test) are not affected by the logarithmic transformation.Comment: submitted to IEEE/EMBS Conference'0

Lepton Flavour Violating top decays at the LHC

We consider lepton flavour violating decays of the top quark, mediated by four-fermion operators. We compile constraints on a complete set of SU(3)*U(1)-invariant operators, arising from their loop contributions to rare decays and from HERA's single top search. The bounds on e-mu flavour change are more restrictive than l-tau; nonetheless the top could decay to a jet $+ e \bar{\mu}$ with a branching ratio of order $10^{-3}$. We estimate that the currently available LHC data (20 inverse-fb at 8 TeV) could be sensitive to $BR(t \to e \bar{\mu}$+ jet) $\sim 6\times 10^{-5}$, and extrapolate that 100 inverse-fb at 13 TeV could reach a sensitivity of $\sim 1 \times 10^{-5}$.Comment: 10 pages + Appendice

The Evolution of Top Incomes in an Egalitarian Society: Sweden, 1903–2004

This study presents new homogenous series of top income shares in Sweden over the period 1903 to 2004. We find that, starting from higher levels of inequality than in other Western countries, the income share of the Swedish top decile drops sharply over the first eighty years of the century. The fall is almost entirely due to a dramatic drop in the top percentile, while the lower half of the top decile experiences virtually no change over this period. Most of the decrease takes place before the expansion of the welfare state, in fact, by 1950 Swedish top income shares were already lower than in other countries. In the past decades the Swedish top income shares developed very differently depending on whether capital gains are included or not. Including them, Sweden’s experience resembles that in the U.S. and the U.K. with sharp increases in top incomes, whereas excluding them Sweden looks more like the Continental European countries where top income shares have remained relatively constant. A possible interpretation of our results is that Sweden over the past 20 years has become a country where it is more important make the right investments than to have a high salary to become rich.Income inequality; Income distribution; Wealth distribution; Top incomes; Welfare State; Sweden; Taxation; Capital gains

Recent CMS results in top and Higgs physics

After the Higgs boson discovery in 2012, the investigation of its properties and compatibility with the standard model predictions is central to the physics program of the LHC experiments. Likewise, the study of the top quark is still relevant at the LHC, more than two decades after its discovery at the Tevatron. Top quarks and Higgs bosons are produced at the LHC on a large scale and share a deep connection based on the large mass of the top quark. Both particles provide an excellent laboratory in which to search for new physics: the measurement of their properties tests the foundations of the standard model; and they feature prominently in a variety of exotic signals. The coupling of the Higgs boson to the top quark, a fundamental standard model parameter, can only be measured directly in processes where the two particles are produced together. The production of a Higgs boson together with one or two top quarks is also sensitive to several exciting new physics effects. A brief overview of the current experimental status of top quark and Higgs boson physics is presented using results from the CMS Collaboration.Comment: Updated version of the Wine & Cheese: Joint Experimental-Theoretical Physics Seminar 'Recent CMS results in top and Higgs physics' given at Fermilab, 20 November 2015. To appear in Mod. Phys. Lett.