On the close to threshold meson production in neutron–neutron collisions
نویسندگان
چکیده
منابع مشابه
Meson production in nucleon–nucleon collisions close to the threshold
The last decade has witnessed great experimental progress that has led to measurements of near threshold cross sections—polarized as well as unpolarized—of high accuracy for various inelastic nucleon–nucleon collision channels. These data, naturally, pose challenges to theorists to develop methods by which they can be understood and explained in commensurate detail. In this work we review the s...
متن کاملOn the close to threshold meson production in neutron-neutron collisions
A method of measuring the close to threshold meson production in neutronneutron collisions is described where the momenta of the colliding neutrons can be determined with the accuracy obtainable for the proton-proton reaction. The technique is based on the double quasi-free nn → nnX reaction, where deuterons are used as a source of neutrons. PACS: 13.60.Le, 13.75.-ni, 13.75.Cs Typeset using REVTEX
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The cross sections for several γγ → V V processes exhibit strong enhancements near threshold, where V denotes a vector meson. The pattern of these enhancements is not well understood; for example, γγ → ρρ shows an appreciable peak, while γγ → ρρ does not. Some possible mechanisms for this behavior are discussed. Tests are proposed involving production of systems containing heavier quarks, e.g.,...
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The PROMICE/WASA collaboration has studied and meson production in nucleon-nucleon collisions near threshold using the CELSIUS ring at the The Svedberg Laboratory, Uppsala. Some of the reaction channels are measured for the rst time in any detail. The results are presented together with an outlook.
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The near threshold total cross section and angular distributions of KK pair production via the reaction pp −→ ppKK have been studied at an excess energy of Q = 17 MeV using the COSY-11 facility at the cooler synchrotron COSY. The obtained cross section as well as an upper limit at an excess energy of Q = 3 MeV represent the first measurements on the KK production in the region of small excess e...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)01016-4