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نویسنده
چکیده
The measured value of Ab, the Zbb asymmetry parameter, disagrees with the Standard Model at 99% confidence level (2.6σ). If genuine the discrepancy could indicate new interactions unique to third generation quarks, implying an enhanced Z penguin amplitude and an enhanced rate for the rare decay K+ → π+νν. Measurements of ǫ/ǫ then suggest there should also be enhanced QCD penguin amplitudes. The Higgs sector of an SU(2)L × SU(2)R gauge theory has some of the features needed to explain these phenomena and would also imply right-handed penguin amplitudes. This work was supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics of the U.S. Department of Energy under Contract DE-AC03-76SF00098. Email: [email protected]
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تاریخ انتشار 1999