Ueber eine neue Verf?lschung der Schwefels?ure

Ohne Zusammenfassung     

B-->pipi, new physics in B-->piK, and implications for rare K and B decays

The measured B-->pipi,piK branching ratios (BRs) exhibit puzzling patterns. We point out that the B-->pipi hierarchy can be nicely accommodated in the standard model (SM) through nonfactorizable hadronic interference effects, whereas the B-->piK system may indicate new physics (NP) in the electroweak (EW) penguin sector. Using the B-->pipi data and the SU(3) flavor symmetry, we fix the hadronic B-->piK parameters and show that any currently observed feature of the B-->piK system can be easily explained through enhanced EW penguin diagrams with a large CP-violating NP phase. This in turn implies in particular an enhancement of the K(L)-->pi(0)nunu rate by 1 order of magnitude, with BR(K(L)-->pi(0)nunu) approximately 4BR(K+-->pi(+)nunu), BR(K(L)-->pi(0)e(+)e(-))=O(10(-10)), and (sin(2beta)(pinunu)<0. We address also other rare K and B decays and B(d)-->phiK(S).     

The $ B\to\pi K$ puzzle and its relation to rare B and K decays

The standard-model interpretation of the ratios of charged and neutral rates, R _c and R _n, respectively, points towards a puzzling picture. Since these observables are affected significantly by colour-allowed electroweak (EW) penguins, this puzzle could be a manifestation of new physics in the EW penguin sector. Performing the analysis in the R _n- R _c plane, which is very suitable for monitoring various effects, we demonstrate that we may, in fact, move straightforwardly to the experimental region in this plane through an enhancement of the relevant EW penguin parameter q. We derive analytical bounds for q in terms of a quantity L, which measures the violation of the Lipkin sum rule, and point out that strong phases around are favoured by the data, in contrast to QCD factorisation. The modes imply a correlation between q and the angle that, in the limit of negligible rescattering effects and colour-suppressed EW penguins, depends only on the value of L. Concentrating on a minimal flavour-violating new-physics scenario with enhanced Z ⁰ penguins, we find that the current experimental values on require roughly . As the data give , L has either to move to smaller values once the data improve or new sources of flavour and CP violation are needed. In turn, the enhanced values of L seen in the data could be accompanied by enhanced branching ratios for the rare decays , , and . Most interesting turns out to be the correlation between the modes and , with the latter depending approximately on a single scaling variable .Received: 8 September 2003, Published online: 12 November 2003     

Eine Diskrepanzabschätzung für stetige Funktionen

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Polymerisation von makro cyclischen Formalen

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Eine Kennzeichnung der symplektischen und orthogonalen Gruppen überGF(4)

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Das polarographische Verhalten von Thorium verbindungen in 1,2-Propandiolcarbonat und N,N-Dimethylacetamid

Zusammenfassung Es wird das polarographische Verhalten von Thorium (IV)-Verbindungen in 1,2-Propandiolcarbonat und N,N-Dimethylacetamid untersucht. Die Lage der Halbwellenpotentiale (gegen die wäßr. gesätt. Kalomelelektrode), die Art der Grenzströme, die analytische Verwertbarkeit der Wellen und der Einfluß von Wasser werden beschrieben.

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Anhydrous and hydrated thorium compounds were investigated polarographically in both propanediol-1.2-carbonate and N,N-dimethylacetamide. The half-wave potentials (vs. aqueous saturated calomel electrode), the nature of the limiting currents, the analytical applicability of the waves and the influence of water are described.

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