کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1841462 | 1527762 | 2010 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Semileptonic decays of light quarks beyond the Standard Model
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Semileptonic decays of light quarks beyond the Standard Model Semileptonic decays of light quarks beyond the Standard Model](/preview/png/1841462.png)
چکیده انگلیسی
We describe non-standard contributions to semileptonic processes in a model independent way in terms of an SU(2)LÃU(1)Y invariant effective lagrangian at the weak scale, from which we derive the low-energy effective lagrangian governing muon and beta decays. We find that the deviation from Cabibbo universality, ÎCKMâ¡|Vud|2+|Vus|2+|Vub|2â1, receives contributions from four effective operators. The phenomenological bound ÎCKM=(â1±6)Ã10â4 provides strong constraints on all four operators, corresponding to an effective scale Î>11 TeV (90% CL). Depending on the operator, this constraint is at the same level or better then the Z pole observables. Conversely, precision electroweak constraints alone would allow universality violations as large as ÎCKM=â0.01 (90% CL). An observed ÎCKMâ 0 at this level could be explained in terms of a single four-fermion operator which is relatively poorly constrained by electroweak precision measurements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 830, Issues 1â2, 1 May 2010, Pages 95-115
Journal: Nuclear Physics B - Volume 830, Issues 1â2, 1 May 2010, Pages 95-115
نویسندگان
Vincenzo Cirigliano, James P. Jenkins, MartÃn González-Alonso,