Computation of the improvement coefficient cSW to one loop with improved gluon actions
نویسندگان
چکیده
منابع مشابه
Computation of the improvement coefficient csw to 1-loop with improved gluon actions
The coefficient csw appearing in the Sheikholeslami-Wohlert improved action is computed to one loop perturbation theory for improved gluon actions including six-link loops. The O(a) improvement coefficients for the dimension three isovector composite operators bilinear in the quark fields are also computed to one loop order of perturbation theory with degenerate non-vanishing quark masses. ∗On ...
متن کاملOne Loop Calculation of the Renormalised Anisotropy for Improved Anisotropic Gluon Actions on a Lattice
Using the infrared dispersion relation of the on shell gluon, we calculate the renormali-sation of the the anisotropy, χ, to one loop in perturbation theory for lattice Yang–Mills theories, including the Wilson action and actions with Symanzik and/or tadpole improvement. Using twisted boundary conditions as a gauge invariant infrared regulator, we show for an SU(3) gauge group in D = 3+1 dimens...
متن کاملOne-loop corrections to five-gluon amplitudes.
We present the one-loop helicity amplitudes with five external gluons. The computation employs string-based methods, new techniques for performing tensor integrals, and improvements in the spinor helicity method. Submitted to Physical Review Letters ‡Research supported by the Texas National Research Laboratory Commission grant FCFY9202. Research supported by the Department of Energy under grant...
متن کاملPerturbative determination of cSW with Symanzik improved gauge action and stout smearing
We determine the improvement factor cSW in one-loop lattice perturbation theory for the plaquette and Symanzik improved gauge actions. The fermionic action is O(a) clover improved with onetime stout smearing. cSW is derived from the one-loop correction to the quark-quark-gluon vertex in the off-shell regime. We give a first numerical value for the one-loop contribution to the non gauge-invarian...
متن کاملThe Six Gluon One-Loop Amplitude
The one-loop scattering amplitude for sixgluons in pure QCD has been an interesting test case for the development of analytic techniques in perturbative gauge theories. The amplitude can be decomposed into various subamplitudes which were calculated between 1993 and 2006 [1–13] in thirteen different publications by 23 authors. The results for the amplitude are spread across a large number of pa...
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: Nuclear Physics B
سال: 1999
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00742-1