کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9854945 | 1527855 | 2005 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Light-quark loops in KâÏνν¯
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Light-quark loops in KâÏνν¯ Light-quark loops in KâÏνν¯](/preview/png/9854945.png)
چکیده انگلیسی
We present a comprehensive analysis of the contributions to KâÏνν¯ decays not described by the leading dimension-six effective Hamiltonian. These include both dimension-eight four-fermion operators generated at the charm scale, and genuine long-distance contributions which can be described within the framework of chiral perturbation theory. We show that a consistent treatment of the latter contributions, which turn out to be the dominant effect, requires the introduction of new chiral operators already at O(GF2p2). Using this new chiral Lagrangian, we analyze the long-distance structure of KâÏνν¯ amplitudes at the one-loop level, and discuss the role of the dimension-eight operators in the matching between short- and long-distance components. From the numerical point of view, we find that these O(GF2ÎQCD2) corrections enhance the SM prediction of B(K+âÏ+νν¯) by about â6%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 718, Issues 1â2, 4 July 2005, Pages 319-338
Journal: Nuclear Physics B - Volume 718, Issues 1â2, 4 July 2005, Pages 319-338
نویسندگان
Gino Isidori, Federico Mescia, Christopher Smith,