Download or read book Two loop Leading colour QCD Helicity Amplitudes for Two photon Plus Jet Production at the LHC written by Herschel A. Chawdhry and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Next to Leading Order Gamma Gamme Plus 2 Jet Production at the LHC written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present next-to-leading-order QCD predictions for cross sections and for a comprehensive set of distributions in [gamma][gamma]+2-jet production at the Large Hadron Collider. We consider the contributions from loop amplitudes for two photons and four gluons, but we neglect top quarks. We use BlackHat together with SHERPA to carry out the computation. We use a Frixione cone isolation for the photons. We study standard sets of cuts on the jets and the photons and also sets of cuts appropriate for studying backgrounds to Higgs-boson production via vector-boson fusion.
Download or read book Next to leading Order 2 jet Production at the LHC written by and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present next-to-leading-order QCD predictions for cross sections and for a comprehensive set of distributions in ??+2-jet production at the Large Hadron Collider. We consider the contributions from loop amplitudes for two photons and four gluons, but we neglect top quarks. We use BlackHat together with SHERPA to carry out the computation. We use a Frixione cone isolation for the photons. We study standard sets of cuts on the jets and the photons and also sets of cuts appropriate for studying backgrounds to Higgs-boson production via vector-boson fusion.
Download or read book Two Loop Helicity Amplitudes for Quark Gluon Scattering in QCD and Supersymmetric Yang Mills Theory written by and published by . This book was released on 2003 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the two-loop QCD helicity amplitudes for quark-gluon scattering, and for quark-antiquark annihilation into two gluons. These amplitudes are relevant for next-to-next-to-leading order corrections to (polarized) jet production at hadron colliders. We give the results in the 't Hooft-Veltman and four-dimensional helicity (FDH) variants of dimensional regularization. The transition rules for converting the amplitudes between the different variants are much more intricate than for the previously discussed case of gluon-gluon scattering. Summing our two-loop expressions over helicities and colors, and converting to conventional dimensional regularization, gives results in complete agreement with those of Anastasiou, Glover, Oleari and Tejeda-Yeomans. We describe the amplitudes for 2 --> 2 scattering in pure N = 1 supersymmetric Yang-Mills theory, obtained from the QCD amplitudes by modifying the color representation and multiplicities, and verify supersymmetry Ward identities in the FDH scheme.
Download or read book Two loop Helicity Amplitudes in QCD written by Lee W. Garland and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two Loop Helicity Amplitudes for Gluon Gluon Scattering in QCD and Supersymmetric Yang Mills Theory written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the two-loop helicity amplitudes for the scattering of two gluons into two gluons in QCD, which are relevant for next-to-next-to-leading order corrections to jet production at hadron colliders. We give the results in the 't Hooft-Veltman and four-dimensional helicity variants of dimensional regularization. Summing our expressions over helicities and colors, and converting to conventional dimensional regularization, gives results in complete agreement with those of Glover, Oleari and Tejeda-Yeomans. We also present the amplitudes for 2 --> 2 scattering in pure N = 1 supersymmetric Yang-Mills theory.
Download or read book Two Loop Amplitudes for Gluon Fusion Into Two Photons written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 M[sub H]
Download or read book Two photon Physics written by F. Kapusta and published by World Scientific. This book was released on 1994 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leading colour Two loop QCD Corrections for Top quark Pair Production in Association with a Jet at a Lepton Collider written by Sascha Peitzsch and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two loop Corrections to Gluon Fusion Into Two Photons written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book QCD Corrections for Two Jet Production in Photon photon Collisions written by F. A. Berends and published by . This book was released on 1980 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two loop Helicity Amplitudes for Quark gluon Scattering in QCD and Gluino gluon Scattering in Supersymmetric Yang Mills Theory written by Zvi Bern and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inclusive Two jet Production in Photon Photon Collisions written by Thorsten Kleinwort and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Next to leading Order Diphoton 2 jet Production at the LHC written by and published by . This book was released on 2014 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exclusive Two photon Processes written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exclusive two-photon processes at large momentum transfer, particularly Compton scattering [gamma]p→[gamma]p and its crossed-channel reactions [gamma][gamma]→{bar p}p and {bar p}p→[gamma][gamma], can provide definitive information on the bound-state distributions of quarks in hadrons at the amplitude level. Recent theoretical work has shown that QCD predictions based on the factorization of long and short distance physics are already applicable at momentum transfers of order of a few GeV.
Download or read book Two Photon Processes at Intermediate Energies written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes and skewed parton distributions. The determination of the shape and normalization of the distribution amplitudes has become particularly important in view of their importance in the analysis of exclusive semi-leptonic and two-body hadronic B-decays. Interesting two-photon physics, including doubly-tagged[gamma]*[gamma]* reactions, will be accessible at low energy, high luminosity e[sup+]e[sup -] colliders, including measurements of channels important in the light-by-light contribution to the muon g-2 and the study of the transition between threshold production controlled by low-energy effective chiral theories and the domain where leading-twist perturbative QCD becomes applicable. The threshold regime of hadron production in photon-photon and e[sup+]e[sup -] annihilation, where hadrons are formed at small relative velocity, is particularly interesting as a test of low energy theorems, soliton models, and new types of resonance production. Such studies will be particularly valuable in double-tagged reactions where polarization correlations, as well as the photon virtuality dependence, can be studied.
Download or read book Large angle Two photon Exclusive Channels in Quantum Chromodynamics written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed leading order QCD predictions are given for the scaling, angular, and helicity dependence of the reactions .gamma gamma. .-->. M anti M (M = .pi., K, rho, etc.) at large momentum transfer. In addition to providing a basic test of QCD at short distances, measurements can be used to determine the process-independent meson distribution amplitudes phi/sub M/(x, Q). Other related two-photon channels such as .gamma gamma. .-->. .gamma.rho, .gamma.*.gamma. .-->. .pi.°, eta°, eta' and eta/sub c/ .-->. .gamma gamma. are also discussed. The existence of a fixed Regge singularity at J = 0 which couples to .gamma.rho .-->. .gamma.rho in the t-channel but not .gamma pi. .-->. .gamma pi. is also proved.
