Scalar form factors f ππ ( Q 2 ) and f KK ( Q 2 ) with light - cone QCD sum rules
نویسنده
چکیده
In this article, we calculate the scalar form factors fππ(Q 2) and fKK(Q 2) within the framework of the light-cone QCD sum rules approach. The numerical value of fππ(Q 2) changes quickly with the variation of Q2 at about Q2 < 0.1GeV 2, while fKK(Q 2) has rather good behavior at small momentum transfer, the value fKK(0) = 2.21 +0.35 −0.19GeV is compatible with the values from the leading order chiral perturbation theory prediction. At large momentum transfer with Q2 > 6GeV 2, the form factor fππ(Q 2) takes up the asymptotic behavior 1 Q , while fKK(Q 2) decreases more quickly than 1 Q . PACS numbers: 12.38.Lg; 12.38.Bx
منابع مشابه
0 v 3 2 2 Ju l 2 00 7 Scalar form - factors f ππ ( Q 2 ) and f KK ( Q 2 ) with light - cone QCD sum rules
In this article, we calculate the scalar form-factors fππ(Q 2) and fKK(Q 2) in the framework of the light-cone QCD sum rules approach. The numerical value of the fππ(Q 2) changes quickly with variation ofQ2 near zero momentum transfer, while the fKK(Q 2) has rather good behavior at small momentum transfer. The value fKK(0) = 2.21 +0.35 −0.19GeV is compatible with the result from the leading ord...
متن کامل0 v 2 1 0 M ay 2 00 7 Scalar form factors f ππ ( Q 2 ) and f KK ( Q 2 ) with light - cone QCD sum rules
In this article, we calculate the scalar form factors fππ(Q 2) and fKK(Q 2) within the framework of the light-cone QCD sum rules approach. The numerical value of fππ(Q 2) changes quickly with variation of Q2 near zero momentum transfer, while the fKK(Q 2) has rather good behavior at small momentum transfer. The value fKK(0) = 2.21 +0.35 −0.19GeV is compatible with the values from the leading or...
متن کاملSe p 20 06 Analysis of the Σ − n form factors with light - cone QCD sum rules
In this work, we study the four form-factors f 1 (Q 2), f 2 (Q 2), g 1 (Q 2) and g 2 (Q 2) of the Σ → n in the framework of the light-cone QCD sum rules approach up to twist-6 three valence quark light-cone distribution amplitudes. The f 1 (0) is the basic input parameter in extracting the CKM matrix element |V us | from the hyperon decays. The four form-factors f 1 (Q 2), f 2 (Q 2), g 1 (Q 2) ...
متن کاملar X iv : h ep - p h / 06 09 15 5 v 2 1 1 N ov 2 00 6 Analysis of the Σ − n form - factors with light - cone QCD sum rules
In this work, we study the four form-factors f 1 (Q 2), f 2 (Q 2), g 1 (Q 2) and g 2 (Q 2) of the Σ → n in the framework of the light-cone QCD sum rules approach up to twist-6 three valence quark light-cone distribution amplitudes. The f 1 (0) is the basic input parameter in extracting the CKM matrix element |V us | from the hyperon decays. The four form-factors f 1 (Q 2), f 2 (Q 2), g 1 (Q 2) ...
متن کاملScalar form-factor of the proton with light-cone QCD sum rules
In this article, we calculate the scalar form-factor of the proton in the framework of the light-cone QCD sum rules approach with the three valence quark light-cone distribution amplitudes up to twist-6, and observe the scalar form-factor σ(t = −Q2) at intermediate and large momentum transfers Q > 2GeV 2 has significant contributions from the end-point (or soft) terms. The numerical values for ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2007