کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9854893 | 1527851 | 2005 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An exploratory lattice study of ÎI=3/2KâÏÏ decays at next-to-leading order in the chiral expansion
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
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چکیده انگلیسی
We present the first direct evaluation of ÎI=3/2KâÏÏ matrix elements with the aim of determining all the low-energy constants at NLO in the chiral expansion. Our numerical investigation demonstrates that it is indeed possible to determine the KâÏÏ matrix elements directly for the masses and momenta used in the simulation with good precision. In this range however, we find that the matrix elements do not satisfy the predictions of NLO chiral perturbation theory. For the chiral extrapolation we therefore use a hybrid procedure which combines the observed polynomial behavior in masses and momenta of our lattice results, with NLO chiral perturbation theory at lower masses. In this way we find stable results for the quenched matrix elements of the electroweak penguin operators (ãÏÏ|O8|K0ãI=2=(0.68±0.09)GeV3 and ãÏÏ|O7|K0ãI=2=(0.12±0.02)GeV3 in the NDR-MS¯ scheme at the scale 2 GeV), but not for the matrix elements of O4 (for which there are too many low-energy constants at NLO for a reliable extrapolation). For all three operators we find that the effect of including the NLO corrections is significant (typically about 30%). We present a detailed discussion of the status of the prospects for the reduction of the systematic uncertainties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 721, Issues 1â3, 15 August 2005, Pages 175-211
Journal: Nuclear Physics B - Volume 721, Issues 1â3, 15 August 2005, Pages 175-211
نویسندگان
Philippe Boucaud, Vicent Giménez, C.-J. David Lin, Vittorio Lubicz, Guido Martinelli, Mauro Papinutto, Chris T. Sachrajda,