منابع مشابه
Two - loop corrections to gg → γγ
An overview of the calculation of the two-loop helicity amplitudes for scattering of two gluons into two photons is presented. These matrix elements enter into the recent improved calculation of the QCD background to Higgs boson decay into a pair of photons, which is the preferred search mode at the LHC for the case of a light Higgs boson. Recent years have seen an enormous improvement in our a...
متن کاملComplete three - loop QCD corrections to the decay H → γγ
We present the result for the three-loop singlet QCD corrections to the decay of a Higgs boson into two photons and improve the calculation for the non-singlet case. With the new result presented, the decay width Γ(H → γγ) is completely known at O(GFααs, GFα).
متن کاملTwo - loop electroweak corrections to the Higgs - boson decay H → γγ
The complete set of two-loop electroweak corrections to the decay width of the Higgs boson into two photons is presented. Two-loop contributions involving weak bosons and the top quark are computed in terms of an expansion in the Higgs external momentum. Adding these results to the previously known light fermion contributions, we find that the total electroweak corrections for a Higgs boson wit...
متن کاملTwo-loop Corrections-to- the Cosmological Constant*
The two-loop contributions to the induced cosmological constant are computed in a matterless Einstein theory of gravity expanded about a Minkowski background with no cosmological term present in the classical action. The regularization-independent cancellation of the contribution to one-loop order is found not to occur to two-loop order. Submitted to Physics Letters B * Work supported by the De...
متن کاملTwo-loop corrections to Bhabha scattering.
The two-loop radiative photonic corrections to Bhabha scattering are computed in the leading order of the small electron mass expansion up to the nonlogarithmic term. After including the soft photon bremsstrahlung, we obtain the infrared-finite result for the differential cross section, which can directly be applied to a precise luminosity determination of the present and future e+ e- colliders.
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2003
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)80164-0