5 M ay 2 00 8 Electroproduction of electron - positron pair in a medium
نویسنده
چکیده
The process of electron-positron pair creation by a high-energy electron in a medium is analyzed. The spectral distribution over energies of created particles is calculated for the direct and cascade mechanisms of the process. The Coulomb corrections are included. The new formulation of the equivalent photons method is developed which takes into account the influence of multiple scattering. It is shown the effects of multiple scattering can be quite effectively studied in the process under consideration.
منابع مشابه
ar X iv : h ep - p h / 03 07 38 8 v 2 1 3 M ay 2 00 4 Analytical calculation of Coulomb corrections to e + e − pair production at intermediate photon energies
First correction to the high-energy asymptotics of the total e + e − photoproduction cross section in the electric field of a heavy atom is obtained with the exact account of this field. The consideration is based on the use of the quasiclassical electron Green function in an external electric field. The influence of screening on the Coulomb corrections is examined in the leading approximation....
متن کاملar X iv : h ep - p h / 01 05 03 3 v 1 3 M ay 2 00 1 Threshold η and η ′ electroproduction off nucleons 1
The electroproduction of η and η ′ mesons on the proton and the neutron is investigated at tree level within the framework of U (3) chiral perturbation theory. In addition to the Born terms low-lying resonances such as the vector mesons and J P = 1/2 + , 1/2 − baryon resonances are included explicitly and their contributions are calculated. Results for the separated differential cross sections ...
متن کاملar X iv : h ep - p h / 05 05 10 4 v 1 1 2 M ay 2 00 5 Invisible Higgs in theories of large extra dimensions
We discuss the possibility of detecting a Higgs boson in electron-positron collider experiments if large extra dimensions are realized in nature. In such a case, the Higgs boson can decay invisibly by oscillating into a graviscalar Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an ee linear collider entails more complications than are usually thought of in relation to an i...
متن کاملar X iv : h ep - p h / 01 05 27 3 v 1 2 5 M ay 2 00 1 Production of the D - wave bb̄ states 1
The first and second families of D-wave bb̄ quarkonium states are expected to have masses near 10.16 and 10.44 GeV/c. The accuracy of these predictions is discussed, and the prospects of two methods for producing these states in electron-positron collisions are updated. Direct scans in the ee center-of-mass can give rise to the D1 states. The 1 DJ states have also been searched for in the electr...
متن کاملar X iv : 0 80 5 . 19 70 v 1 [ he p - ph ] 1 4 M ay 2 00 8 Macro - coherent two photon and radiative neutrino pair emission
We discuss a possibility of detecting a coherent photon pair emission and related radiative neutrino pair emission from excited atoms. It is shown that atoms of lambdaand ladder-type three level system placed in a pencil-like cylinder give a back to back emission of two photons of equal energy ∆/2, sharply peaked with a width ∝ 1/( target size) and well collimated along the cylinder axis. This ...
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