Multiboson threshold production by fermion-antifermion pair and hidden symmetry

نویسندگان

  • Joanna Domienik
  • Piotr Kosiński
چکیده

We consider threshold production of arbitrary number of Higgs particles ρ by fermion-antifermion pair f f̄ . The nullification of amplitudes for the special case mρ = 2mf is explained in terms of hidden symmetry of the reduced effective dynamics. supported by the Lódź University grant No.269. supported by KBN grant No. 5 P03B 06021

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ar X iv : 0 71 0 . 20 05 v 1 [ he p - ph ] 1 0 O ct 2 00 7 Hidden Fermion in Stueckelberg Z ′ Models as Milli - charged Dark Matter

The hidden Stueckelberg Z′ model is augmented by a pair of Dirac fermions. If the Z′ has a coupling strength comparable to weak scale coupling, one can show that this hidden fermion-antifermion pair could be a milli-charged dark matter candidate with a viable relic density. Monochromatic photon flux coming from the Galactic center due to pair annihilation of these milli-charged particles is cal...

متن کامل

Two - Loop Corrections to the Electromagnetic Vertex for Energies close to Threshold

Two-loop contributions to the electromagnetic form factors are calculated in the kinematic regime close to the fermion-antifermion threshold. The results are presented in an expansion in the velocity β of the fermions in the c.m. frame up to next-to-next-to leading order in β. The existence of a new Coulomb singularity logarithmic in β, which is closely related to the O(α 2 ln α) corrections kn...

متن کامل

ar X iv : 0 71 0 . 20 05 v 2 [ he p - ph ] 1 5 O ct 2 00 7 Hidden Fermion in Stueckelberg Z ′ Models as Milli - charged Dark Matter

The hidden Stueckelberg Z′ model is augmented by a pair of Dirac fermions. If the Z′ has a coupling strength comparable to weak scale coupling, one can show that this hidden fermion-antifermion pair could be a milli-charged dark matter candidate with a viable relic density. Monochromatic photon flux coming from the Galactic center due to pair annihilation of these milli-charged particles is cal...

متن کامل

Two - Loop Corrections to the Electromagnetic

Two-loop contributions to the electromagnetic form factors are calculated in the kinematic regime close to the fermion-antifermion threshold. The results are presented in an expansion in the velocity of the fermions in the c.m. frame up to next-to-next-to leading order in. The existence of a new Coulomb singularity logarithmic in , which is closely related to the O(2 ln) corrections known from ...

متن کامل

Fermi Ball Detection

The detectability of charged SLAC-bag type structures is considered. These objects, known as Fermi balls, arise from the spontaneous symmetry breaking of a biased discrete symmetry in the early universe. Two classes of experimental searches are discussed. Since Fermi balls in the theoretically favoured mass range are absorbed by the atmosphere, direct experimental searches are confined to space...

متن کامل

ذخیره 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 2003