Cross section and analyzing power of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>pn</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>near threshold

Fäldt, Göran; Wilkin, C.

doi:10.1103/physrevc.56.2067

Cited by 34 publications

(34 citation statements)

References 24 publications

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“…To large extent, this behavior may plausibly be explained by the difference in strength of the proton-proton and proton-neutron final-state interaction [46]. An influence of the nucleon-nucleon interaction on the shape of the excitation function for the pn → pnη and pp → ppη reactions may be well described by the closed analytical formula derived by Fäldt and Wilkin [47,48] that implies that:…”

Section: Resultsmentioning

confidence: 97%

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Moskal¹,

Czyzykiewicz²,

Adam³

et al. 2009

Phys. Rev. C

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Total cross sections for the quasifree pn → pnη reaction in the range from the kinematical threshold up to 20 MeV excess energy have been determined. At threshold they exceed corresponding cross sections for the pp → ppη reaction by a factor of about 3 in contrast to the factor of 6 established for higher excess energies. To large extent, the observed decrease of the ratio σ (pn → pnη)/σ (pp → ppη) toward threshold may be assigned to the different energy dependence of the proton-proton and proton-neutron final-state interactions. The experiment was conducted using a proton beam of the cooler synchrotron COSY and a cluster jet deuteron target. The proton-neutron reactions were tagged by the spectator proton whose momentum was measured for each event. Protons and neutron outgoing from the pn → pnη reaction have been registered by means of the COSY-11 facility, an apparatus dedicated for threshold meson production.

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Section: Resultsmentioning

confidence: 97%

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Moskal¹,

Czyzykiewicz²,

Adam³

et al. 2009

Phys. Rev. C

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“…[56] and also in Ref. [57]. In this subsection we want to discuss qualitatively the differences between our model and other model calculations in the literature.…”

Section: B Role Of the ηN N Coupling Constantmentioning

confidence: 88%

Production of η mesons in nucleon-nucleon collisions

et al. 2003

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A microscopic calculation of near-threshold η-meson production in the reaction N N → N N η is presented. It is assumed that the η meson is produced via direct emission and via elementary rescattering processes M N → ηN of various mesons M = π, ρ, etc. As a novel feature the amplitudes for the latter production mechanism are taken from a multi-channel meson-exchange model of the πN system developed by the Jülich group which contains explicitly the channels πN , ρN , ηN , σN , and π∆. Furthermore, effects of the N N interaction in the final as well as in the initial state are taken into account microscopically. Our results are compared with recent data from the COSY and CELSIUS accelerator facilities. Reasonable agreement with available near-threshold cross section data for the reactions pp → ppη, pn → pnη, and pn → dη is found.

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“…Solid lines present theoretical predictions for the ω and η production cross sections from Ref. [20] and [21], respectively. the ppK + K − events, determined using Monte Carlo simulations taking into account the pp-FSI, is equal to 2.83%.…”

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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Cross section and analyzing power ofp→p→pnπ+near threshold

Cited by 34 publications

References 24 publications

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Near-threshold production of theηmeson via the quasifreepn→pnηreaction

Production of η mesons in nucleon-nucleon collisions

Near-threshold charged kaon pair production in two protons collisions

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