Two-loop coefficient function for DVCS: vector contributions
نویسندگان
چکیده
منابع مشابه
Chiral–loop and Vector–meson Contributions to Η → Ππγγ Decays
The process η → π 0 π 0 γγ is discussed in Chiral Perturbation Theory (ChPT). Special attention is devoted to one-loop corrections, η-η ′ mixing effects and vector-meson dominance of ChPT counter-terms. The less interesting η → π + π − γγ transition is briefly discussed too. The rare decay modes η → π 0 π 0 γγ and η → π + π − γγ have been recently discussed by several authors in the context of ...
متن کاملElastic vector meson production and DVCS at HERA
Recent results from the H1 and ZEUS experiments are reviewed. The cross sections of elastic photoand electroproduction of the vector mesons φ and J/ψ are measured as functions of Q2,W and t. The large statistics and the large coverage in t and W allow the determination of the effective Regge exchange trajectories, which are found to be different from the soft pomeron trajectory. Shrinkage is ob...
متن کاملOn the two-loop contributions to the pion mass
We derive a simplified representation for the pion mass to two loops in threeflavour chiral perturbation theory. For this purpose, we first determine the reduced expressions for the tensorial two-loop 2-point sunset integrals arising in chiral perturbation theory calculations. Making use of those relations, we obtain the expression for the pion mass in terms of the minimal set of master integra...
متن کاملNew Two-loop Contributions to Hadronic EDMs in the MSSM
Flavor-changing terms with CP-violating phases in the quark sector may contribute to the hadronic electric dipole moments (EDMs). However, within the Standard Model (SM), the source of CP violation comes from the unique CKM phase, and it turns out that the EDMs are strongly suppressed. This implies that the EDMs are very sensitive to non-minimal flavor violation structures of theories beyond th...
متن کاملTwo-loop contributions to electroweak precision observables in the MSSM
The evaluation of the two-loop MSSM-contributions to the electroweak precision observables MW and sin 2 θeff at O(αt ), O(αtαb), O(α 2 b ) is presented. These contributions enter via ∆ρ, and it is explained in detail how one can retain the true, non-vanishing value of the MSSM Higgs boson mass Mh in spite of using the gauge-less limit in the calculation. The numerical results can be sizeable, i...
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: Journal of High Energy Physics
سال: 2020
ISSN: 1029-8479
DOI: 10.1007/jhep09(2020)117