Near-Threshold Production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ω</mml:mi></mml:math>Mesons in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">pp</mml:mi><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi mathvariant="italic">pp</mml:mi><mml:mi mathvariant="italic">ω</mml:mi></mml:math>Reaction

Hibou, F.; Bing, O.; Boivin, M.; Courtat, P.; Gacougnolle, R.; Bornec, Y. Le; Martin, J.; Plouin, F.; Tatischeff, B.; Wilkin, C.; Willis, N.; Wurzinger, R.

doi:10.1103/physrevlett.83.492

Cited by 54 publications

(133 citation statements)

References 20 publications

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“…The calculated angular differential cross sections of the π − p → nφ reaction at ∆s (We would like to mention here, that the extrapolated value of the φ production cross section in NN reactions [16] from the data [10] would require somewhat different parameter sets, which in turn cause also more pronounced differences between the sets A and B.) Contrary to that, for the model C the largest destructive interference appears at forward direction, where the contributions of the two competing channels (a) and (b) are close to each other.…”

Section: A Fixing Parametersmentioning

confidence: 99%

Production of φ mesons in near-threshold π

Титов¹,

Kämpfer²,

Reznik³

2000

EPJ A

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We analyze the production of φ mesons in πN and N N reactions in the nearthreshold region, using throughout the conventional "non-strange" dynamics based on such processes which are allowed by the non-ideal ω − φ mixing.We show that the occurrence of the direct φN N interaction may show up in different unpolarized and polarization observables in πN → N φ reactions.We find a strong non-trivial difference between observables in the reactions pp → ppφ and pn → pnφ caused by the different role of the spin singlet and triplet states in the entrance channel. A series of predictions for the experimental study of this effect is presented.

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Section: A Fixing Parametersmentioning

confidence: 99%

Production of φ mesons in near-threshold π

Титов¹,

Kämpfer²,

Reznik³

2000

EPJ A

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“…As compared to the ω cross section, the φ meson which couples to the strangeness content of the nucleon should be strongly suppressed by the OZI rule which forbids disconnected quark line diagrams. The assumption of only a small OZI violation leads to a φ over ω ratio of ∼ 4 · 10 −3 in pp reactions at comparable excess energies [10] while experimentally this ratio was found to be about one order of magnitude larger [7,8,11].…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the small ω width of 8.4 MeV which allows an identification of the narrow ω peak in missing mass spectra already close to threshold. Data for the ω production in proton-proton (pp → ppω) collisions at small excess energies were recently taken at SATURNE [7] and with the COSY-TOF spectrometer [8]. The excess energy ǫ is thereby defined as ǫ = √ s − (2m p + m ω ) with √ s being the protonproton center-of-mass energy, m p the proton mass and m ω = 782 MeV the physical ω mass at its pole value.…”

Section: Introductionmentioning

confidence: 99%

Off-shellωproduction in proton-proton collisions near threshold

et al. 2003

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“…The COSY-11 acceptance for Figure 3. Experimental total cross sections for the ω production [8][9][10][11][12][13] and η production [11,[14][15][16][17][18][19], together with the present data points. Solid lines present theoretical predictions for the ω and η production cross sections from Ref.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

Near-threshold charged kaon pair production in two protons collisions

Gil

Smyrski

2016

EPJ Web Conf.

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Abstract. The pp → ppK + K − reaction was measured near threshold at excess energy Q = 4.5 MeV using the COSY-11 detection system installed at the COSY-Juelich accelerator. Preliminary value of upper limit of the total cross section was determined. This limit indicates that an enhancement of the total cross section close to the threshold, caused by the final state interaction, is smaller than suggested by extrapolation of data measured at higher energies. Physics motivationThe energy dependence of the pp → ppK + K − total cross section close to threshold is very sensitive to the interactions between particles in the final state, and therefore is well suited for studies of these interactions. There are many interesting topics connected with the interactions of the final state kaons and protons. For example, the K + K − interaction is crucial for understanding the structure of the scalar mesons f 0 (980) and a 0 (980), which according Ref. [1,2] are KK molecules. In turn, the K − p interaction is interesting from the point of view of study the nature of the Λ(1405) hyperon, which is considered as a K − p molecular state [3]. There are also some astrophysical aspects of studying kaons production reactions, like description of neutron stars structure [4]. Elementary reactions of kaon pair production in pp collisions are also important for better understanding of the properties of kaons inside dense baryonic matter [5]. The existing data for the kaon pair production in pp collisions were measured for excess energies higher than Q = 6 MeV, with exception of one point at 3 MeV, for which only upper limit of the total cross section was determined. On the other hand, data very close to threshold (for Q < 6 MeV) are crucial for distinguishing between various models of the final state interaction (FSI) in the ppK + K − system. Therefore, we performed a high luminosity measurement at Q = 4.5 MeV. ExperimentThe measurement was performed with the COSY-11 detection system, described in details in Ref. [6], at the COSY-Juelich accelerator. A principle of the measurement is presented in Fig. 1. Internal proton beam of the COSY was scattered on the COSY-11 H 2 cluster target. The beam momentum

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Near-Threshold Production ofωMesons in thepp→ppωReaction

Cited by 54 publications

References 20 publications

Production of φ mesons in near-threshold π

Production of φ mesons in near-threshold π

Off-shellωproduction in proton-proton collisions near threshold

Near-threshold charged kaon pair production in two protons collisions

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