5,052 research outputs found

    Getting beta-alpha without penguins

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    Oscillation effects in B0 -> Ks D0 and related processes are considered to determine delta=beta-alpha+pi. We suggest that D0 decays to CP eigenstates used in concert with inclusive D0 decays provide a powerful method for determining delta cleanly i.e. without any complication from penguin processes. The CP asymmetry is expected to be <=40% for D0 decays to non-CP eigenstates and <=80% for decays to CP eigenstates. This method can lead to a fairly accurate determination of delta with O(10^8-10^9) B-mesons.Comment: 4 pages 1 figure; Version 2: minor changes; references added; Some changes in response to Referee Comment

    CP Violation in Top Physics at the NLC

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    Top quark is extremely sensitive to non-standard CP violating phases. General strategies for exposing different types of phases at the NLC are outlined. SUSY phase(s) cause PRA in t→Wbt\to Wb. The transverse polarization of the τ\tau in the reaction t→bτνt\to b\tau\nu is extremely sensitive to a phase from the charged Higgs sector. Phase(s) from the neutral Higgs sector cause appreciable dipole moment effects and lead to sizable asymmetries in e+e−→ttˉH0e^+e^-\to t\bar tH^0 and e+e−→ttˉνeνˉee^+e^-\to t\bar t\nu_e\bar\nu_e.}]Comment: 4 pages, Latex, 2 figures. For the Proceedings of the 28th Int. Conf. on HEP, Warsaw(July 1996

    CP Nonconservation in e+e−→ttˉge^+e^-\to t\bar tg

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    CP violation effects in e+e−→ttˉge^+ e^- \to t\bar tg are examined. CP-odd, TnT_n-odd and TnT_n-even observables can both be used to extract information on the real and imaginary parts of Feynman amplitudes. Two Higgs doublet model with CP violating phase from neutral Higgs exchange is used to estimate possible effects.Comment: 9 pages, 4 Figures, Late

    Bounds on charged higgs boson in the 2HDM type III from Tevatron

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    We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level. In the framework of this model we can use an appropriate form of the Yukawa Lagrangian that makes the type II model limit of the general type III couplings apparent. This way is useful in order to compare with the experimental data which is model dependent. The analytical expressions of the partial width Γ(t→H+b)\Gamma (t \to H^+ b) are derived and we compare with the data available at this energy range. We examine the limits on the new parameters λij\lambda_{ij} from the validness of perturbation theory.Comment: 14 pages, 4 figures, Universidad Nacional de Colombia. typos correcte

    The Phenomenology of Language and the Metaphysicalizing of the Real

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    This essay joins Wilhelm Dilthey’s conception of the metaphysical impulse as a flight from the tragedy of human finitude with Ludwig Wittgenstein’s understanding of how language bewitches intelligence. We contend that there are features of the phenomenology of language that play a constitutive and pervasive role in the formation of metaphysical illusion

    The Power of Phenomenology: Psychoanalytic and Philosophical Perspectives

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    This book demonstrates how the authors have experienced the power of phenomenology in their therapeutic work with patients, especially those struggling with horrific trauma; in their encounters with psychological and philosophical theories; and in their efforts to comprehend destructive ideologies and the collective traumas that give rise to them. The Power of Phenomenology presents the trajectory of this work. Each chapter begins with a contribution written by one or both authors, extending the power of phenomenological inquiry to one or more of these diverse contexts. The contributions are followed, one or two at a time, by a dialogue between the authors, illustrating the dialectical process of their long collaboration. The unusual format seeks to bring the phenomenology of their collaborative efforts to life for the reader

    Pure Leptonic Radiative Decays B±,Ds→ℓνγB^\pm, D_s\to\ell\nu\gamma and the Annihilation Graph

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    Pure leptonic radiative decays of heavy-light mesons are calculated using a very simple non-relativistic model. Dominant contribution originates from photon emission from light initial quark. We find BR(B±→ℓνγ)∼3.5×10−6BR(B^\pm\to\ell\nu\gamma)\sim3.5\times10^{-6} and BR(Ds→ℓνγ)∼1.7×10−4BR(D_s\to \ell\nu\gamma)\sim1.7 \times10^{-4}. The importance of these reactions to clarify the dynamics of the annihilation graph is emphasized.Comment: 7 pages, LaTeX, 3 figure

    Role of Charm Factory in Extracting CKM-Phase Information via B --> DK

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    In this paper we study the impact of data that can be obtained from a Charm Factory on the determination of the CKM parameter gamma from decays of the form B -> D0 K where the D0 decays to specific inclusive and exclusive final states. In particular, for each exclusive final state ff, the charm factory can determine the strong phase difference between D0-> f and D0-bar -> f by exploiting correlations in psi(3770)-> D0 D0-bar. This provides crucial input to the determination of gamma via the interference of B+- -> K+- D0 -> f with B+- -> K+- D0-bar -> f. We discuss how the method may be generalized to inclusive final states and illustrate with a toy model how such methods may offer one of the best means to determine gamma with 10^8-10^9 B-mesons.Comment: 12 pages, 7 figures, Version 2: Fixed typos; add reference; Version 3: fixed latex glitc

    Desperately Seeking Non-Standard Phases via Direct CP Violation in b→sg∗b\to sg^\ast Process

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    Attributing the recent CLEO discovery of B→η′+XsB \to \eta' + X_s to originate (primarily) from the fragmentation of an off-shell gluon (g∗g^*) via b→s+g∗b \to s + g^*, g∗→g+η′g^* \to g + \eta', we emphasize that many such states (XgX_g) should materialize. Indeed the hadronic fragments (XgX_g) of g∗g^* states are closely related to those seen in ψ→γ(ϕ,ω)+Xg\psi \to \gamma (\phi, \omega) + X_g. A particular final state of considerable interest is Xg=K+K−X_g=K^+K^-. Signals from such states in BB decays can be combined to provide a very sensitive search for CP violating phase(s) from non-standard physics. The method should work even if the contribution of these source(s) to the rates is rather small (∼10\sim10%) to the point that a comparison between theory and experiment may find it extremely difficult to reveal the presence of such a new physics.Comment: 16 pages, 5 figure
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