134,043 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
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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
Atmospheric Methane Concentrations
No full textIt was first discovered that the atmospheric concentration of methane was increasing based upon samples collected in the late seventies and early eighties at Cape Meares, Oregon (Rasmussen and Khalil, 1981). Since that time, more detailed and extensive data sets have allowed estimation of sources and sinks of methane on the global scale. As attempts are made to refine these estimates, the value of the current databases will be greatly increased, as will the need for more current data
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Radiative B-L symmetry breaking in supersymmetric models
No full textWe propose a scheme where the three relevant physics scales related to the supersymmetry, electroweak, and
baryon minus lepton (B − L) breakings are linked together and occur at the TeV scale. The phenomenological
implications in the Higgs and leptonic sectors are discussed
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
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
Learning Arabic in Ashwat Science (Khalil Bin Ahmad Perspective)
No full textIn learning Arabic, Al-Ashwat plays an important role in understanding a language. There is a lot of literature that states that studying and studying al-Ashwat must take precedence before studying and studying other components and skills of language. There are several Arab figures or scientists who study the science of ashwat, but in this study the author only focuses on the figure of ashwat, namely Khalil bun Ahmad. The purpose of this study is to find out the role, contribution, and thoughts of Khalil bin Ahmad in the science of ashwat in Arabic language learning. And to know the development of Arabic sciences in the hands of al-Khalil bin Ahmad al-Farahidi. This research is included in the type of qualitative research using library research methods. The source of data from this study is the book 'Ilmu al-Aswad al-'Arabiyyah by Muhammad Jawad An-Nuuri, articles, journals, papers, theses, and encyclopedias. Data collection techniques in this study by a) collecting literature related to Khalil bin Ahmad's thoughts in ashwat, b) classifying books, documents, or other sources, c) quoting Khalil bin Ahmad's views according to the context of the research focus, and d) grouping data according to research systematics. And the results of this study are: That Khalil bin Ahmad's role in the science of ashwat was to introduce the use of dots and harakat, he also marked the sound of dhammah with a small waw letter above the letter, the sound of fathah with alif written horizontally, and the sound of kasrah with a lowercase ya' that connects under the letter. And as for the contribution and development of Arabic language sciences in the hands of khalil bin Ahmad in the science of ashwat including in pioneering the formulation of Nahwu and Sharf rules.
Dalam pembelajaran bahasa Arab, Al-Ashwat memegang peranan penting dalam memahami suatu bahasa. Telah banyak literatur yang menyebutkan bahwa mempelajari dan mengkaji al-Ashwat wajib untuk didahulukan sebelum mempelajari dan mengkaji komponen dan keterampilan kebahasaan yang lainnya. Ada beberapa tokoh atau ilmuwan Arab yang mengkaji tentang ilmu ashwat, tetapi pada penelitian ini penulis hanya berfokus pada tokoh ilmu ashwat yakni Khalil bun Ahmad. Adapun tujuan dari penelitian ini adalah untuk mengetahui peran, kontribusi, serta pemikiran Khalil bin Ahmad dalam ilmu ashwat pada pembelajaran bahasa Arab. Dan untuk mengetahui perkembangan ilmu-ilmu bahasa Arab di tangan al-Khalil bin Ahmad al-Farahidi. Penelitian ini termasuk kedalam jenis penelitian kualitatif dengan menggunakan metode library research. Sumber data dari penelitian ini berupa kitab ‘Ilmu al-Aswad al-‘Arabiyyah karya Muhammad Jawad An-Nuuri, artikel, jurnal, makalah, skripsi, dan ensiklopedia. Teknik pengumpulan data pada penelitian ini dengan a) menghimpun literatur yang berkaitan dengan pemikiran Khalil bin Ahmad dalam ilmu ashwat, b) mengklasifikasi buku, dokumen, atau sumber lainnya, c) mengutip pandangan-pandangan Khalil bin Ahmad sesuai dengan konteks fokus penelitian, dan d) mengelompokkan data sesuai dengan sistematika penelitian.Dan hasil dari penelitian ini adalah bahwasanya peran khalil bin ahmad dalam ilmu ashwat yakni memperkenalkan penggunaan titik dan harakat, beliau juga menandai bunyi dhammah dengan huruf waw kecil diatas huruf, bunyi fathah dengan dengan alif yang ditulis horizontal, dan bunyi kasrah dengan huruf ya’ kecil yang menyambung dibawah huruf. Dan adapun kontribusi dan perkembangan ilmu-ilmu bahasa Arab di tangan khalil bin Ahmad dalam ilmu ashwat diantaranya yaitu dalam merintis formulasi kaidah-kaidah Nahwu dan Sharf
- …
