55 research outputs found

    Multiscale Technicolor and bsγb \to s \gamma

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    Correction to the bsγb\rightarrow s\gamma branching ratio in the multiscale walking technicolor model (MWTCM) is examined. For the original MWTCM, the correction is too large to explain the recent CLEO data. We show that if topcolor is further introduced, the branching ratio in the topcolor assisted MWTCM can be in agreement with the CLEO data for a certain range of the parameters.Comment: 11 pages, Latex, no macros, 3 figures, hard copy is available upon request. to appear in Z. Phys.

    Incremental Discriminant Analysis on Interval-Valued Parameters for Emitter Identification

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    Emitter identification has been widely recognized as one crucial issue for communication, electronic reconnaissance, and radar intelligence analysis. However, the measurements of emitter signal parameters typically take the form of uncertain intervals rather than precise values. In addition, the measurements are generally accumulated dynamically and continuously. As a result, one imminent task has become how to carry out discriminant analysis of interval-valued parameters incrementally for emitter identification. Existing machine learning approaches for interval-valued data analysis are unfit for this purpose as they generally assume a uniform distribution and are usually restricted to static data analysis. To address the above problems, we bring forward an incremental discriminant analysis method on interval-valued parameters (IDAIP) for emitter identification. Extensive experiments on both synthetic and real-life data sets have validated the efficiency and effectiveness of our method

    Probing neutrino oscillations jointly in long and very long baseline experiments

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    We examine the prospects of making a joint analysis of neutrino oscillation at two baselines with neutrino superbeams. Assuming narrow band superbeams and a 100 kt water Cerenkov calorimeter, we calculate the event rates and sensitivities to the matter effect, the signs of the neutrino mass differences, the CP phase and the mixing angle \theta_{13}. Taking into account all possible experimental errors under general consideration, we explored the optimum cases of narrow band beam to measure the matter effect and the CP violation effect at all baselines up to 3000 km. We then focus on two specific baselines, a long baseline of 300 km and a very long baseline of 2100 km, and analyze their joint capabilities. We found that the joint analysis can offer extra leverage to resolve some of the ambiguities that are associated with the measurement at a single baseline.Comment: 23 pages, 11 figure

    Muon anomalous magnetic moment in technicolor models

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    Contributions to the muon anomalous magnetic moment are evaluated in the technicolor model with scalars and topcolor assisted technicolor model. In the technicolor model with scalars, the additional contributions come from the loops of scalars, which were found sizable only for a very large f/ff/f^{'} disfavored by the experiment of bsγb\to s\gamma. The topcolor effect is also found to be large only for an unnaturally large tanθ\tan\theta', and thus the previously evaluated loop effects of extended technicolor bosons, suppressed by mμ2/METC2m_{\mu}^2/M_{ETC}^2, must be resorted to account for the E821 experiment. So, if the E821 experiment result persists, it would be a challenge to technicolor models.Comment: refs and comments adde

    B_{s,d}--> mu^+ mu^- in technicolor model with scalars

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    Rare decays B_{s,d}-->mu^+ mu^- are evaluated in technicolor model with scalars. R_b is revisited to constrain the model parameter space. It is found that restriction on f/f' arising from R_b which was not considered in previous studies requires f/f' no larger than 1.9 at 95% confidence level, implying no significantly enhancement for Br(B_{s,d}-->mu^+\mu^-) from neutral scalars in the model. However, the branching ratio of B_s--> mu^+ mu^- can still be enhanced by a factor of 5 relative to the standard model prediction. With the value of f/f' about 1.9, an upgraded Tevatron with an integrated luminosity 20fb^-1 will be sensitive to enhancement of B_s-->mu^+ mu^- in this model provided that neutral scalar mass m_sigma is below 580 GeV.Comment: 6 Pages, 4 Figures, use ReVtex4, the model description rewritten and some references adde

    Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology

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    As discussed recently by Hooper and Tait, the singlino-like dark matter in the Minimal Supersymmetric Standard Model (MSSM) extended by a singlet Higgs superfield can give a perfect explanation for both the relic density and the Pamela result through the Sommerfeld-enhanced annihilation into singlet Higgs bosons (aa or hh followed by h>aah->a a) with aa being light enough to decay dominantly to muons or electrons. In this work we analyze the parameter space required by such a dark matter explanation and also consider the constraints from the LEP experiments. We find that although the light singlet Higgs bosons have small mixings with the Higgs doublets in the allowed parameter space, their couplings with the SM-like Higgs boson hSMh_{SM} (the lightest doublet-dominant Higgs boson) can be enhanced by the soft parameter AκA_\kappa and, in order to meet the stringent LEP constraints, the hSMh_{SM} tends to decay into the singlet Higgs pairs aaaa or hhhh instead of bbˉb\bar b. So the hSMh_{SM} produced at the LHC will give a multi-muon signal, h_{SM} -> aa -> 4 muons or h_{SM} -> hh -> 4 a -> 8 muons.Comment: Version in JHE