Threshold Cross Section Measurements
نویسنده
چکیده
Accurate measurements of particles masses, couplings and widths are possible by measuring production cross sections near threshold. We discuss the prospects for performing such measurements at a high luminosity muon collider.
منابع مشابه
l - th / 9 61 20 40 v 1 1 6 D ec 1 99 6 Antikaon production in nucleon - nucleon reactions near threshold ∗
The antikaon production cross section from nucleon-nucleon reactions near threshold is studied in a meson exchange model. We include both pion and kaon exchange, but neglect the interference between the amplitudes. In case of pion exchange the antikaon production cross section can be expressed in terms of the antikaon production cross section from a pion-nucleon interaction, which we take from ...
متن کاملFe b 19 98 Final State Interactions in the Near - Threshold Production of Kaons from Proton - Proton Collisions ∗
We analyse the pp → pΛK cross section recently measured at COSY arguing that the enhancement of the production cross section at energies close to the reaction threshold should be due to the Λp final state interaction. We find that the experimental Λp elastic scattering data as well as the predictions from the Jülich-Bonn model are in reasonable agreement with the new results on K +-meson produc...
متن کاملFinal State Interactions in the Near-Threshold Production of Kaons from Proton-Proton Collisions
We analyse the pp → pΛK cross section recently measured at COSY arguing that the enhancement of the production cross section at energies close to the reaction threshold should be due to the Λp final state interaction. We find that the experimental Λp elastic scattering data as well as the predictions from the Jülich-Bonn model are in reasonable agreement with the new results on K-meson producti...
متن کاملTwo-loop QCD corrections to the heavy quark pair production cross section in e+e− annihilation near the threshold
We present the O(αs) corrections to the cross section for the reaction e+e− → γ∗ → QQ̄ in the energy region close to the threshold. We assume that the energy of the reaction is such that both the perturbative expansion in the strong coupling constant αs and expansion in the velocity β of the heavy quarks can be used. We explicitly obtain terms O(αs/β 2, αs/β, α 2 s) in the relative correction to...
متن کاملLow Energy Cross-Sections for Positron Interactions with Cyclic Hydrocarbons
We report total cross-section measurements for positron scattering on cyclic hydrocarbons: benzene, aniline, and cyclohexane. Measurements were done by an absolute transition method in the energy range 1.5–20 eV (0.4–20 eV for cyclohexane). High cross-sections for all measured molecules were observed at low energies. In the case of cyclohexane the cross-section in the zero energy limit tends to...
متن کامل