Effects of relativistic dynamics in pp → ppπ0 near threshold
نویسندگان
چکیده
منابع مشابه
Effects of Relativistic Dynamics in pp − → ppπ 0 near Threshold
The cross-section for threshold π0 production in proton-proton collisions is evaluated in the framework of the covariant spectator description. The negative energy intermediate states are included non-perturbatively and seen to yield a considerably smaller contribution, when compared to perturbative treatments. A family of OBE-models with different off-shell scalar coupling is considered. Types...
متن کاملThe pp → K + nΣ + reaction near threshold
Inclusive K+ production in proton-proton collisions has been measured at a beam energy of 2.16GeV using the COSY-ANKE magnetic spectrometer. The resulting spectrum, as well as those corresponding to K+p and K+π+ correlated pairs, can all be well described using consistent values of the total cross sections for the pp → K+pΛ, pp → K+pΣ0, and pp → K+nΣ+ reactions. While the resulting values for Λ...
متن کاملNear threshold Λ and Σ production in pp collisions
A model calculation for the reactions pp → pΛK + and pp → NΣK near their thresholds is presented. It is argued that the experimentally observed strong suppression of Σ 0 production compared to Λ production at the same excess energy could be due to a destructive interference between the π and K exchange contributions in the reaction pp → pΣ 0 K +. Predictions for pp → pΣ + K 0 and pp → nΣ + K + ...
متن کاملHigher Partial Waves in Pp ! Ppp near Threshold
Exclusive measurements of the production of-mesons in the pp ! ppp reaction have been carried out at excess energies of 16 and 37 MeV above threshold. The deviations from phase space are dominated by the proton-proton nal state interaction and this innuences particularly the energy distribution of the meson. However, evidence is also presented at the higher energy for the existence of an anisot...
متن کاملTwo-pion-exchange contributions to the pp→ ppπ0 reaction
Our previous study of the near-threshold pp→ ppπ0 reaction based on a hybrid nuclear effective field theory is further elaborated by examining the momentum dependence of the relevant transition operators. We show that the two-pion-exchange diagrams give much larger contributions than the one-pion-exchange diagram, even though the former is of higher order in the Weinberg counting scheme. The re...
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: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00732-6