Low-energy expansion of the pion-nucleon Lagrangian

The renormalized pion-nucleon Lagrangian is calculated to O(p^3) in heavy baryon chiral perturbation theory. By suitably chosen transformations of the nucleon field, the Lagrangian is brought to a standard form.Comment: 10 pages, Latex, 1 figure in uuencoded postscript file embedded with epsfig.st

Curvature estimates for Weingarten hypersurfaces in Riemannian manifolds

We prove curvature estimates for general curvature functions. As an application we show the existence of closed, strictly convex hypersurfaces with prescribed curvature $F$, where the defining cone of $F$ is \C_+. $F$ is only assumed to be monotone, symmetric, homogeneous of degree 1, concave and of class C^{m,\al}, $m\ge4$.Comment: 9 pages, v2:final version, to be publishe

<VAP> Green Function in the Resonance Region

We analyse the three-point function of vector, axial-vector and pseudoscalar currents. In the spirit of large N_C, a resonance dominated Green function is confronted with the leading high-energy behaviour from the operator product expansion. The matching is shown to be fully compatible with a chiral resonance Lagrangian and it allows to determine some of the chiral low-energy constants of O(p^6).Comment: 13 pages, 2 figures. Published version. Results and conclusions unchange

Anatomy of Mixing-Induced CP Asymmetries in Left-Right-Symmetric Models with Spontaneous CP Violation

We investigate the pattern of CP violation in K, B_d and B_s mixing in a symmetrical SU(2)_R x SU(2)_L x U(1) model with spontaneous CP violation. We calculate the phases of the left and right quark mixing matrices beyond the small phase approximation and perform a careful analysis of all relevant restrictions on the model's parameters from Delta m_K, Delta m_B, epsilon, epsilon'/epsilon and the CP asymmetry in B->J/psi K_S. We find that, with current experimental data, the mass of the right-handed charged gauge boson, M2, is restricted to be in the range 2.75 to 13 TeV and the mass of the flavour-changing neutral Higgs boson, MH, in 10.2 to 14.6 TeV. This means in particular that the decoupling limit M2, MH -> infinity is already excluded by experiment. We also find that the model favours opposite signs of epsilon and sin 2beta and is excluded if sin 2beta > 0.1.Comment: 33 pages Latex with 11 Postscript-Figures (included

The phenomenology of emotion in depressed young adolescents.

Depressive affect and depressive disorders have been shown to increase in the transition from childhood to early adolescence. Furthermore, although Major Depression is classified as an affective disorder and many have asserted the importance that knowledge about emotions holds for understanding the organization, etiology, neurobiology, and treatment of depression, empirical investigation has been lacking. This is particularly true as regards adolescence. The current study explored the subjective experience of emotions, with attention also to emotional expression, associated with depression in groups of 39 psychiatric inpatients and 22 non-clinical control young adolescents. Measures included a self-report measure of depressive symptomatology, the Childhood Depression Inventory (CDI), and a self-report measure of the frequency of experience of individual emotions, the Differential Emotions Scale-IV (DES-IV). Two new emotions scales, Loved and Detached, were added to the DES-IV. There also was a video mood induction procedure accompanied by verbal report of immediate emotional state and detailed analysis of emotional facial expressions using the AFFEX system. Results were analyzed considering differences in depression level and gender. Depressed subjects scored significantly higher on a Dysphoria factor, most saliently comprised of Inward Hostility and Shame but also including Shyness, Fear and Sadness, and significantly lower on a Joy/Loved factor. The depressed subjects also reported being more aware of their emotions. Regarding emotional expression, depressed subjects showed a higher frequency of negative emotions (anger, sadness, disgust) and a lower frequency of joy than their non-depressed counterparts. There were no depression-related differences in self-report of emotional state in response to the video mood induction procedure, though males reported being happier than females. The relationship between emotional experience and emotional expression was stable over all depression level by gender groupings with the exception of highly depressed males. Overall, there were large gender-related differences in the organization of emotions associated with depression, with relationships for males characterized as fragmented. Study results are discussed in reference to research on emotions and depression in children and adults, normal adolescent emotional development, and adolescent development in other domains, most notably the self-concept

Comment on soft-pion emission in DVCS

The soft-pion theorem for pion production in deeply virtual Compton scattering, derived by Guichon, Mosse and Vanderhaegen, is shown to be consistent with chiral perturbation theory. Chiral symmetry requires that the nonsinglet operators corresponding to spin-independent and spin-dependent parton distributions have the same anomalous dimensions in cases where those operators are related by chiral transformations. In chiral perturbation theory, their scale-dependences can thus be absorbed in the coefficents of the corresponding effective operators, without affecting their chiral structures.Comment: 2 pages, RevTe

Long distance contribution to K+→π+ννˉK^+ \to \pi^+ \nu {\bar \nu} decay and O(p4)O(p^4) terms in CHPT

The long distance contribution to $K^+ \to \pi^+ \nu {\bar \nu}$ is calculated using chiral perturbation theory. The leading contribution comes from $O(p^4)$ tree terms. The branching ratio of the $O(p^4)$ long distance contribution is found to be of order $10_{-3}$ smaller than the short distance contributions.Comment: 12 pages, 1 figure (available upon request

Role of Scalar Meson Resonances in $K_{L}^{0} \rightarrow \pi^{0} \gamma \gamma Decay

Corrections to $K_{L}^{0}\rightarrow \pi^{0} \gamma \gamma$ decay induced by scalar meson exchange are studied within chiral perturbation theory. In spite of bad knowledge of scalar-mesons parameters, the calculated branching ratio can be changed by a few percent.Comment: 18 pages of text, 2 figures (available upon request); preprint IJS-TP-16-94 , TUM-T31-63-94