The Dipion Mass Spectrum In e+e- Annihilation and tau Decay: A Dynamical (rho0, omega, phi) Mixing Approach

We readdress the problem of finding a simultaneous description of the pion form factor data in e+e- annihilations and in tau decays. For this purpose, we work in the framework of the Hidden Local Symmetry (HLS) Lagrangian and modify the vector meson mass term by including the pion and kaon loop contributions. This leads us to define the physical rho, omega and phi fields as linear combinations of their ideal partners, with coefficients being meromorphic functions of s, the square of the 4--momentum flowing into the vector meson lines. This allows us to define a dynamical, i.e. s-dependent, vector meson mixing scheme. The model is overconstrained by extending the framework in order to include the description of all meson radiative (V P gamma and P gamma gamma couplings) and leptonic (Ve+e- couplings) decays and also the isospin breaking (omega/ phi --> pi+ pi-) decay modes. The model provides a simultaneous, consistent and good description of the e+e- and tau dipion spectra. The expression for pion form factor in the latter case is derived from those in the former case by switching off the isospin breaking effects specific to e+e- and switching on those for tau decays. Besides, the model also provides a good account of all decay modes of the form V P gamma, Pgamma gamma as well as the isospin breaking decay modes. It leads us to propose new reference values for the rho^0 --> e+ e- and omega --> pi+ pi- partial widths which are part of our description of the pion form factor. Other topics (phi --> K anti K, the rho meson mass and width parameters) are briefly discussed. Therefore, we confirm the 3.3 sigma discrepancy between the theoretical estimate of a_mu based on e+e- and its direct BNL measurement.Comment: 71 pages, 8 figures. Accepted by EPJ C. Version 3: correct minor typos, minor changes spread out into the text. Extension of Sections 12.2 and 12.3.5 and introduction of the new Appendix

A Historiometric Examination of Machiavellianism and a New Taxonomy of Leadership

Although researchers have extensively examined the relationship between charismatic leadership and Machiavellianism (Deluga, 2001; Gardner & Avolio, 1995; House & Howell, 1992), there has been a lack of investigation of Machiavellianism in relation to alternative forms of outstanding leadership. Thus, the purpose of this investigation was to examine the relationship between Machiavellianism and a new taxonomy of outstanding leadership comprised of charismatic, ideological, and pragmatic leaders. Using an historiometric approach, raters assessed Machiavellianism via the communications of 120 outstanding leaders in organizations across the domains of business, political, military, and religious institutions. Academic biographies were used to assess twelve general performance measures as well as twelve general controls and five communication specific controls. The results indicated that differing levels of Machiavellianism is evidenced across the differing leader types as well as differing leader orientation. Additionally, Machiavellianism appears negatively related to performance, though less so when type and orientation are taken into account.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline

Right on to France, we\u27ll take a chance, we\u27ll lick you Kaiser [first line of chorus]

Performance Medium: Piano and Voice (with lyrics

Modelling the survival of British Lapwings Vanellus vanellus using ring-recovery data and weather covariates

Two sets of data are considered. One describes recovery data from Lapwings ringed as young in Britain in 1963-92. The other provides several weather covariates for the same period, and our objective is to try to relate these two data sets. We use score tests, provided by the computer package Eagle, to build a simple model which describes the data well. We first establish a need for time variation in the three basic elements of the model: first-year annual survival probability, adult annual survival probability and reporting probability. We then investigate the direct incorporation of covariates, using score tests, to give a limited set of models to compare. The final choice between these models is based on the Akaike information criterion (Alc). We find that adult annual survival is negatively related to measures of winter weather severity. In contrast to previous work, we have found a pronounced decline of reporting rate with time. Our methods produce appreciably higher estimates of adult survival than those previously obtained using methods which assumed reporting rates to be constant over time

In situ X-ray Absorption Spectroscopic Studies of Magnetic Fe@FexOy/Pd Nanoparticle Catalysts for Hydrogenation Reactions

Core@shell Fe@FexOy nano particles ( have attracted a great deal of interest as potential magnetic supports for catalytic metals via galvanic exchange reactions. In this study Fe@Fe x O y /Pd bimetallic NPs were synthesized through galvanic exchange reaction s using 50:1, 20:1 and 5:1 molar ratio s of Fe@Fe x O y NPs to Pd(NO 3 2 . The resulting Fe@Fe x O y /Pd NPs have Pd nanoparticles on the Fe ox ide surfaces, and the NPs are linked in chains as shown by TEM analysis and EDX mapping. After galvanic reactions with Pd , the particles still retain their response to external magnetic fields . The magnetic properties of the resulting materials led to the ir successful application as nanometer sized magnetic stir bars for hydrogenation reactions. The Fe@Fe x O y /Pd NPs derived f rom the 5:1 molar ratio of their respective salts (Fe:Pd) exhibit ed a higher catalytic activity than particles synthesized from 20:1 and 50:1 molar ratios for the hydrogenation of 2 methyl 3 buten 2 ol . T he highest turnover frequency reach ed 3600 h 1 using ethanol as a solvent. In situ X ray absorption near edge structure (XANES) spectra show that the Fe@Fe x O y core shell particles in the Fe@Fe x O y /Pd system are easily oxidized when dispersed in water, while they are very stable if ethanol is used as a solvent. This oxidative stability has important implications for the use of such particles in real world applications

Upgraded breaking of the HLS model: a full solution to the τ\tau-e+e^{+}e−e^{-} and ϕ\phi decay issues and its consequences on g\mathit{g}-2 VMD estimates

The muon anomalous magnetic moment $a_\mu$ and the hadronic vacuum polarization are examined using data analyzed within the framework of a suitably broken HLS model. The analysis relies on all available scan data samples and leaves provisionally aside the existing ISR data. Our HLS model based global fit approach allows for a better check of consistency between data sets and we investigate how results depend on different strategies which may be followed. Relying on global fit qualities, we find several acceptable solutions leading to ambiguities in the reconstructed value for $(a_\mu)_{th}$. Among these, the most conservative solution is $a_\mu^{\rm had,LO}[{\rm HLS \ improved}]=687.72(4.63) \times 10^{-10}$and$(a_\mu)_{th}=11\,659\,175.37(5.31)\times 10^{-10}$corresponding to a$4.1 \sigma$significance for the difference$\Delta a_\mu=(a_\mu)_{exp}-(a_\mu)_{th}$. It is also shown that the various contributions accessible through the model yield uniformly a factor 2 improvement of their uncertainty. The breaking procedure implemented in the HLS model is an extension of the former procedure based on the BKY mechanism. This yields a quite satisfactory simultaneous description of most$e^+e^-$annihilation channels up to and including the$\phi$meson ($\pi^+\pi^-$,$\pi^0\gamma$,$\eta\gamma$,$\pi^+\pi^-\pi^0$,$K^+K^-$,$K^0 \bar{K}^0$) and of a set of 10 (mostly radiative) decay widths of light mesons. It also allows to achieve the proof of consistency between the$e^+e^- \to \pi^+\pi^-$annihilation and the$\tau^\pm \ra \pi^\pm\pi^0 \nu$decay and gives a solution to the reported problem concerning the measured partial width ratio$\Gamma(\phi \to K^+K^-)/\Gamma(\phi \to K^0 \bar{K}^0)$. Prospects for improving the VMD based estimates of$a_\mu$ are emphasized.Comment: 97 pages, 13 figures accepted for Publication in Eur. Phys. Journ.