منابع مشابه
Double chiral logs in the ππ scattering amplitude
By using the Renormalization Group Equations in Chiral Perturbation Theory, one can calculate the double chiral logs that appear at two loops in any matrix element. We calculate them in the ππ scattering amplitude, where they represent the potentially largest two loop contribution. It is shown that their correction is reasonably small. ♯ Work supported in part by Schweizerischer Nationalfonds/ ...
متن کاملEvidence for Quenched Chiral Logs *
Using the pole shifting procedure of the modified quenched approximation (MQA) to cure the exceptional configuration problem, accurate hadron spectrum calculations can be obtained at very light quark mass. Here we use the MQA to extend and improve our previous investigation of chiral logs in the pion mass. At β = 5.7 for Wilson fermions, we see clear evidence for quenched chiral logarithms in t...
متن کاملElectroweak Double-logs at Small X
We investigate enhanced EW corrections to inclusive hard processes in the TeV energy region with emphasis on the small-x situation, in which the hard scale Q is significantly smaller than the available energy √ s ≡ Q/x. We first propose and justify a general factorization formula in which the (double-log) EW form factor at scale Q is factorized from EW parton distribution functions, which satis...
متن کاملLarge-N Summation of Chiral Logs for Generalized Parton Distributions
We demonstrate that in the region of Bjorken xBj ∼ m 2 π/(4πFπ) 2 and/or xBj ∼ |t|/(4πFπ) 2 the standard χPT for the pion GPDs fails and one must perform all order resummation of χPT. We perform such resummation in the large-N limit of the O(N + 1) extension of the chiral theory. Explicit resummation allows us to reveal novel phenomena – the form of the leading chiral correction to pion PDFs an...
متن کاملSearching for chiral logs in the static - light decay constant
Using the clover fermion action in unquenched QCD with pion masses as low as 420 MeV, we look for evidence for chiral logs in the static-light decay constant. There is some evidence for a chiral log term, if the original static theory of Eichten and Hill is used. However, the more precise data from the static action of the ALPHA collaboration do not show any evidence for non-linear dependence o...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1998
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(98)01193-9