336,070 research outputs found
Supersymmetric Models and CP violation in B decays
No full textIn this talk CP violation in the supersymmetric models, and especially in B-decays is discussed. We review our analysis of the supersymmetric contributions to the mixing CP asymmetries of and processes. Both gluino and chargino exchanges are considered in a model independent way by using the mass insertion approximation method. The QCD factorization method is used, and parametrization of this method in terms of Wilson coefficients is presented in both decay modes. Correlations between the CP asymmetries of these processes and the direct CP asymmetry in decay are shown.In this talk CP violation in the supersymmetric models, and especially in B-decays is discussed. We review our analysis of the supersymmetric contributions to the mixing CP asymmetries of and processes. Both gluino and chargino exchanges are considered in a model independent way by using the mass insertion approximation method. The QCD factorization method is used, and parametrization of this method in terms of Wilson coefficients is presented in both decay modes. Correlations between the CP asymmetries of these processes and the direct CP asymmetry in decay are shown.In this talk CP violation in the supersymmetric models, and especially in B-decays is discussed. We review our analysis of the supersymmetric contributions to the mixing CP asymmetries of and processes. Both gluino and chargino exchanges are considered in a model independent way by using the mass insertion approximation method. The QCD factorization method is used, and parametrization of this method in terms of Wilson coefficients is presented in both decay modes. Correlations between the CP asymmetries of these processes and the direct CP asymmetry in decay are shown
New resonant behavior in the spin resolved photoionization of the rare gas atoms Kr 3d and Xe 4p
No full textKhalil T. New resonant behavior in the spin resolved photoionization of the rare gas atoms Kr 3d and Xe 4p. Bielefeld (Germany): Bielefeld University; 2002.In the first part of this thesis, the transferred spin polarization of resonantly excited Auger electrons of Kr 3d-1 5p photoionized by circularly polarized light was measured. The transferred spin polarization is related to the orientation A10 (and alignment A20) of core holes induced by the primary photoionization process, and to the intrinsic parameters [xi]1 which characterizes the transferred spin polarization of Auger electrons and [alpha]2, the anisotropy parameter which characterizes the angular intensity distribution of Auger electrons. Due to the selection rules of dipole excitation of Kr 3d-1 5p atoms i.e. Ji=1, A10 and A20 are known, [alpha]2 was calculated and measured by Kitajima et al. The calculation of [xi]1 was performed by N. M. Kabachnik and S. Fritzsche.
In the second part of this thesis, the spin polarization of Xe 4p near the ionization threshold was measured to examine the calculations of Cherepkov of contribution of the lowest order nondipole term; the electric-dipole-electric-quadrupole interference terms to the spin polarization of Xe np photoelectrons. The quadrupol matrix elements of the np->[epsilon]f transitions in Xe calculated in RPAE have strong maxima near the ionization threshold. This behaviour is similar to the well-known maxima in the dipole nd->[epsilon]f transitions. These dipole nd->[epsilon]f transitions are responsible for the so-called giant resonances in the total photoionization cross section. They are attributed to the double-well shape of the effective potential for the dipole [epsilon]f partial waves. Both the RPAE non-relativistic calculation from Cherepkov and the relativistic IPA adapted calculation from Derevianko agree qualitatively with the measured nondipole component of electron spin polarization
On the decays in general supersymmetric models
No full textWe analyze the inclusive semileptonic decays B -> X_s l^+ l^- in the framework of the supersymmetric standard model with non-universal soft-breaking terms at GUT scale. We show that the general trend of universal and non-universal models is a decreasing of branching ratio (BR) and increasing of energy asymmetry (AS). However, only non--universal models can have chances to get very large enhancements in BR and AS, corresponding to large (negative) SUSY contributions to the b -> s \gamma amplitude.We analyze the inclusive semileptonic decays B -> X_s l^+ l^- in the framework of the supersymmetric standard model with non-universal soft-breaking terms at GUT scale. We show that the general trend of universal and non-universal models is a decreasing of branching ratio (BR) and increasing of energy asymmetry (AS). However, only non--universal models can have chances to get very large enhancements in BR and AS, corresponding to large (negative) SUSY contributions to the b -> s \gamma amplitude.We analyze the inclusive semileptonic decays B→X s l + l − in the framework of the supersymmetric standard model with non-universal soft-breaking terms at GUT scale. We show that the general trend of universal and non-universal models is a decreasing of branching ratio (BR) and increasing of energy asymmetry (AS). However, only non-universal models can have chances to get very large enhancements in BR and AS, corresponding to large (negative) SUSY contributions to the b → sγ amplitude
Constraining supersymmetric models from B-d-Bover-bar-(d) mixing and the B-d -> J/psi K-s asymmetry
No full textWe analyze the chargino contributions to B-d-(B) over bar (d) mixing and CP asymmetry of the B-d-->J/psiK(S) decay, in the framework of the mass insertion approximation. We derive model independent bounds on the relevant mass insertions. Moreover, we study these contributions in supersymmetric models with minimal flavor violation, Hermitian flavor structure, and small CP violating phases and universal strength Yukawa couplings. We show that, in supersymmetric models with large flavor mixing, the observed values of sin 2beta may be entirely due to the chargino-up-squark loops
The b -> s gamma decay in SUSY models with non-universal A-terms
No full textWe analyse the predictions for the inclusive branching ratio for B --> X(s)gamma in a class of string-inspired SUSY models with non-universal soft-breaking A-terms. These models are particularly interesting since the non-universality of the A-terms plays an important role in providing new significant contributions to CP violation effects in kaon physics while respecting the severe bounds on electric dipole moments. We show that b --> s gamma do not severely constrain the non-universality of these models. In particular, at low tan B (tan B similar or equal to 2), our predictions are close to the universal case. For large tan beta (tan beta greater than or similar to 15), the effect of non-universality is enhanced and stronger constraints hold. We find that the parameter regions which are important for generating sizeable contribution to epsilon'/epsilon, of order 2 x 10(-3), are not excluded. (C) 2001 Elsevier Science B.V. All rights reserved
Russell–Silver syndrome presenting as early asymmetric IUGR
No full textWe report a case of severe intrauterine growth restriction (IUGR) which was diagnosed as Russell–Silver syndrome (RSS) postnatally. RSS (also known as Silver–Russell syndrome) is one of more than 300 recognised forms of genetic disorder that leads to short stature. Uniparental disomy for chromosome 7 (UPD7), i.e. inheriting two copies of chromosome 7 from the mother, and a change in methylation pattern (biochemical silencing of gene expression) of chromosome 11 are the most frequently associated chromosomal defects. A wide spectrum of appearances and symptoms are associated with the condition. Most characteristics are not easily identifiable with prenatal diagnostic ultrasound. The symptom most likely to be detected sonographically is IUGR. This case seeks to raise awareness of RSS, and encourages clinicians to consider uncommon genetic disorders such as RSS as a possible cause of early asymmetric IUGR. ABSTRACT FROM AUTHOR]; Copyright of Ultrasound is the property of Royal Society of Medicine Press Limited and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)32572957Source type: Electronic(1
THE ANOMALOUS FLUORESCENCE OF N,N-DIALKYL-P-CYANOANILINES
No full textPresent address of Omar S. Khalil: School of Chemistry, Rutgers University New Brunswick, New Jersey, 08903.Author Institution: Coates Chemical Laboratories, Louisiana State UniversityAbsorption and luminescence spectra of N,N-dialkyl-p-cyanoanilines in a variety of solvents are reported. Evidences for ``dimer” and ``excimer” formation are provided and the anomalous luminescences of these molecules, which exhibits three distinctly-different fluorescence emissions and two very dissimilar phosphorescence processes, are interpreted
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