XYZ-SU3 breakings from Laplace sum rules at higher orders
نویسندگان
چکیده
منابع مشابه
Sum Rules for Higher-twist Parton Distributions
In deep-inelastic scattering experiments, there is a general connection between subtractions in dispersion relations, violations of sum-rules and δ-functions in parton distribution functions. It is explained why one might expect a small violation in sum rules for the twist-3 distribution functions gT (x) and hL(x) when the sumrules are applied to x 6= 0 data only. The non-perturbative predictio...
متن کاملSudakov Resummations at Higher Orders ∗
We summarize our recent results on the resummation of hard-scattering coefficient functions and on-shell form factors in massless perturbative QCD. The threshold resummation has been extended to the fourth logarithmic order for deep-inelastic scattering, Drell-Yan lepton pair production and Higgs production via gluon-gluon fusion. The leading six infrared pole terms have been derived to all ord...
متن کاملPions at Finite Temperature from QCD Sum Rules
The temperature corrections to the current algebra Gell-Mann, Oakes, and Renner (GMOR) relation in SU(2)⊗SU(2) are investigated in the framework of QCD sum rules. There are no corrections at leading order in the quark masses. At the next to leading order we find corrections of the form mq T 2, which are small except near the critical temperature. As a by-product we obtain the temperature behavi...
متن کاملMassive QCD amplitudes at higher orders
We consider the factorization properties of on-shell QCD amplitudes with massive partons in the limit when all kinematical invariants are large compared to the parton mass and discuss the structure of their infrared singularities. The dimensionally regulated soft poles and the large collinear logarithms of the parton masses exponentiate to all orders. Based on this factorization a simple relati...
متن کاملfBs from QCD sum rules
The decay constants of the pseudoscalar mesons B and Bs are evaluated from QCD sum rules for the pseudoscalar two-point function. Recently calculated perturbative three-loop QCD corrections are incorporated into the sum rule. An analysis in terms of the bottom quark pole mass turns out to be unreliable due to large higher order radiative corrections. On the contrary, in the MS scheme the higher...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Modern Physics A
سال: 2018
ISSN: 0217-751X,1793-656X
DOI: 10.1142/s0217751x18500823