Two-Loop Amplitudes for Gluon Fusion into Two Photons
نویسندگان
چکیده
We present the two-loop matrix elements for the scattering of two gluons into two photons in QCD. These matrix elements will enter into improved estimates of the QCD background to Higgs production at the LHC when the Higgs decays into two photons. The photon mode is especially important if MH < 140 GeV. We also give the amplitudes for the crossed process, gγ → gγ.
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 کاملTwo-loop helicity amplitudes for the production of two off-shell electroweak bosons in gluon fusion
We compute the part of the two-loop virtual amplitude for the process gg → V1V2 → (l1 l̄ ′ 1)(l2 l̄ ′ 2), where V1,2 are arbitrary electroweak gauge bosons, that receives contributions from loops of massless quarks. Invariant masses of electroweak bosons are allowed to be different from each other. Our result provides an important ingredient for improving the description of gluon fusion contribut...
متن کاملGluon - fusion contributions to H + 2 jet production
Real emission corrections to Higgs production via gluon fusion, at order αs, lead to a Higgs plus two-jet final state. We present the calculation of these scattering amplitudes, as induced by top-quark triangle-, boxand pentagon-loop diagrams. These diagrams are evaluated analytically for arbitrary top mass mt. We study the renormalization and factorization scale-dependence of the resulting H +...
متن کاملTwo-Loop Four-Gluon Amplitudes in N=4 Super-Yang-Mills
Using cutting techniques we obtain the two-loop N = 4 super-Yang-Mills helicity amplitudes for four-gluon scattering in terms of scalar integral functions. The N = 4 amplitudes are considerably simpler than corresponding QCD amplitudes and therefore provide a testing ground for exploring two-loop amplitudes. The amplitudes are constructed directly in terms of gauge invariant quantities and ther...
متن کاملMultigluon helicity amplitudes involving a quark loop.
We apply the solution to the recursion relation for the double-off-shell quark current to the problem of computing one loop amplitudes with an arbitrary number of gluons. We are able to compute amplitudes for photon-gluon scattering, electron-positron annihilation to gluons, and gluon-gluon scattering via a quark loop in the case of like-helicity gluons. In addition, we present the result for t...
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 2008