Photon-photon scattering and tests of gauge invariance
نویسندگان
چکیده
منابع مشابه
Time invariance violation in photon-atom and photon-molecule interactions.
Time invariance violation in photon-atom and photon-molecule interactions. Abstract A direct experimental proof of strong T-invariance violation in interactions of the photons with atoms and molecules exists in the molecular physics. PACS number: 42.50.-p " Even for the physicist [a] description in plain language will be a criterion of the degree of understanding that has been reached ". The se...
متن کاملHadronic photon-photon scattering at LEP
Hadronic interactions of two quasi-real photons have been studied extensively both during the LEP1 and the LEP2 data taking periods. The higher energies available at LEP2 in particular opened regions of phase space where hadronic processes can be predicted reliably by perturbative QCD calculations, usually available to next-to-leading order in the strong coupling constant for the process concer...
متن کاملEffective QCD coupling and power corrections to photon-photon scattering
The scattering of two off-shell photons is an infrared-safe process in QCD. For photon virtualities Q in the range of a few GeV, accessible at LEPII, powerbehaved contributions in (ΛQCD/Q) n to the total cross section may become non-negligible. Based on a dispersion relation for the running coupling, we discuss these contributions and calculate the coefficients of the leading power correction f...
متن کاملPhoton-photon scattering, pion polarizability, and chiral symmetry.
Recent attempts to detect the pion polarizability via analysis of γγ → ππ measurements are examined. The connection between calculations based on dispersion relations and on chiral perturbation theory is established by matching the low energy chiral amplitude with that given by a full dispersive treatment. Using the values for the polarizability required by chiral symmetry, predicted and experi...
متن کاملCritical Scattering and Two Photon
At the Mott transition of a quark/meson plasma, mesons become un-bound. This leads to the eeect of critical scattering, which is studied by investigating photon pair production due to the process q q !. This process can proceed either via direct annihilation or via the formation of a mesonic resonance. It is shown that the latter channel leads to an enhancement of photon pairs with invariant ma...
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: Physical Review D
سال: 2013
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.87.036005