Proton-proton collisions at production thresholds
نویسنده
چکیده
Recent results obtained by the COSY – 11 collaboration concerning the production of η and η mesons in the pp → ppMeson reaction are presented. A comparison of the production amplitude for the π, η and η mesons at the same phase space volume allows to conclude that the proton η interaction is in the order of, or smaller than, the proton-π one. A total cross section determined in a preliminary analysis of the data of elementary kaon and antikaon production via the pp → ppKK reaction measured at excess energy of Q = 17 MeV is reported.
منابع مشابه
مطالعه تولید منحصر بفرد جفت پایونهای مثبت و منفی در برخوردهای پروتون-پروتون با مرکز جرم 7 ترا الکترون ولت
The exclusive production of charged pions, are reported in the proton-proton collisions, where the π+π- pair is emitted at the central rapidity, y, and the scattered protons stay intact (p) without detection. This measurement is performed with the CMS detector at the LHC, using a data sample corresponding to an integrated luminosity of 450 μb-1 collected at a center-of-mass energy of 7 TeV. Th...
متن کاملMedium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies
Production cross sections of K and K− mesons have been measured in C+C collisions at beam energies per nucleon below and near the nucleon-nucleon threshold. At a given beam energy, the spectral slopes of the K− mesons are significantly steeper than the ones of the K mesons. The excitation functions for K and K− mesons nearly coincide when correcting for the threshold energy. In contrast, the K ...
متن کاملPerturbative QCD Results on Pion Production in pp , pA and AA Collisions
We summarize new pQCD results on pion production in proton-proton (pp), proton-nucleus (pA) and nucleus-nucleus (AA) collisions. Our calculation introduces intrinsic parton transverse momentum (k T) and is performed effectively at next-to-leading order (NLO), applying a K factor extracted for jet events. Two different factorization scales, Q = p T,jet /2 and p T,jet are used. Experimental data ...
متن کاملStrangeness production as a function of charged particle multiplicity in proton-proton collisions
Recent measurements performed in high-multiplicity proton-proton (pp) and proton-lead (p-Pb) collisions have shown features that are reminiscent of those observed in lead-lead (Pb-Pb) collisions. These observations warrant a comprehensive measurement of the production of identified particles. We report on the production of K0 S , Λ, Λ, Ξ ± and Ω± at mid-rapidity measured as a function of multip...
متن کاملStrange Particle Production Mechanisms in Proton-Proton Collisions at RHIC
Abstract. We present data on strange particle production in elementary proton-proton collisions at RHIC energies. Comparison to leading order and next-to-leading order (NLO) calculations shows that the fragmentation process is flavor dependent and that higher order corrections are needed to describe all spectra, in particular at these collision energies, which are modest compared to the Tevatro...
متن کامل