Investigation of the subthreshold production of K − mesons in proton-nucleus collisions

Akindinov, A.; Kiselev, Yu.T.; Martemyanov, A.N.; Mikhailov, K.; Paryev, É. Ya.; Smirnitsky, V. A.; Terekhov, Yu.V.; Chumakov, M.M.; Sheǐnkman, V. A.

doi:10.1134/s0021364007030034

Cited by 6 publications

(31 citation statements)

References 23 publications

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“…the same conclusion as drawn above). The K − excitation functions in pBe and pCu interactions have also been determined for a K − momentum of 1.28 GeV/c for bombarding energies < 3 GeV at the ITEP/Moscow accelerator [64,166]. They are reasonably reproduced as well by the above folding model, assuming vacuum K + , K − masses [64].…”

Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 79%

“…Since the actual magnitude of the antikaon scalar potential, entering into the dispersion relation (53) through the Eq. (54), is not reliably known also at finite momenta (see Section 4.3.2), it has been adopted in the momentum-independent form (56) or is treated as a free parameter to be extracted in the analysis of inclusive [64,166] and exclusive [167] data on K − production in pA collisions, taken at the ITEP/Moscow and COSY/Jülich accelerators, in the framework of the nuclear spectral function approach [77,78,86]. We note in passing that the "free particle" dispersion relation (53) for the K − energy in matter with the effective momentum-independent antikaon mass (and momentum-independent scalar potential V K − )…”

Section: In-medium Antikaon Potential Theoretical Predictionsmentioning

confidence: 99%

“…The in-medium modifications of K − meson properties have also been studied experimentally in proton-nucleus reactions at beam energies close to or below the production threshold in N N collisions over the last years (see, for example, [46,58,64,166,167]). The advantage of such reactions compared to heavy-ion collisions is that the processes of hadron production and propagation proceed in cold static nuclear matter of well-defined density at zero temperature.…”

Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 99%

“…The K − excitation functions in pBe and pCu interactions have also been determined for a K − momentum of 1.28 GeV/c for bombarding energies < 3 GeV at the ITEP/Moscow accelerator [64,166]. They are reasonably reproduced as well by the above folding model, assuming vacuum K + , K − masses [64]. On the other hand, these data do not contradict the results of calculations within the spectral function approach [78] for incoherent primary proton-nucleon and secondary pion-nucleon antikaon production processes (but without accounting for the φ feed-down effect on K − yield which is insignificant at this high momentum [64,58]), carried out in the scenario with zero kaon potential and antikaon potential of about -126 MeV at density ρ 0 .…”

Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 99%

See 3 more Smart Citations

Meson–nucleus potentials and the search for meson–nucleus bound states

Metag

Nanova

Paryev

2017

Progress in Particle and Nuclear Physics

108

102

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Recent experiments studying the meson-nucleus interaction to extract meson-nucleus potentials are reviewed. The real part of the potentials quantifies whether the interaction is attractive or repulsive while the imaginary part describes the meson absorption in nuclei. The review is focused on mesons which are sufficiently long-lived to potentially form meson-nucleus quasi-bound states. The presentation is confined to meson production off nuclei in photon-, pion-, proton-, and lightion induced reactions and heavy-ion collisions at energies near the production threshold. Tools to extract the potential parameters are presented. In most cases, the real part of the potential is determined by comparing measured meson momentum distributions or excitation functions with collision model or transport model calculations. The imaginary part is extracted from transparency ratio measurements. Results on K + , K 0 , K − , η, η , ω, and φ mesons are presented and compared with theoretical predictions. The interaction of K + and K 0 mesons with nuclei is found to be weakly repulsive, while the K − , η, η , ω and φ meson-nucleus potentials are attractive, however, with widely different strengths. Because of meson absorption in the nuclear medium the imaginary parts of the meson-nucleus potentials are all negative, again with a large spread. An outlook on planned experiments in the charm sector is given. In view of the determined potential parameters, the criteria and chances for experimentally observing meson-nucleus quasi-bound states are discussed. The most promising candidates appear to be the η and η mesons.

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Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 79%

Section: In-medium Antikaon Potential Theoretical Predictionsmentioning

confidence: 99%

Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 99%

Section: Determination Of the K − -Nucleus Real Potentialmentioning

confidence: 99%

See 2 more Smart Citations

Meson–nucleus potentials and the search for meson–nucleus bound states

Metag

Nanova

Paryev

2017

Progress in Particle and Nuclear Physics

108

102

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“…Analysis of the KaoS data on the ratio of K − and K + inclusive momentum spectra from reactions p + A → K ± + X with A =C and Au at laboratory angles from 36 • to 60 • and beam energy of 2.5 GeV within the BUU transport model has shown that these data are consistent with the in-medium K − A potential of the order of -80 MeV at normal nuclear density [36]. Reasonable description of the measured at ITEP accelerator both inclusive antikaon momentum distributions in the momentum range from 0.6 to 1.3 GeV/c at a lab angle of 10.5 • in pBe, pCu interactions at 2.25, 2.4 GeV beam energies and K − excitation functions in these interactions for K − momentum of 1.28 GeV/c at bombarding energies < 3 GeV was, respectively, reached in [37] and in [38] in the frame of folding model, based on the target nucleon momentum distribution and on free elementary cross sections, assuming vacuum K + , K − masses. The K − potential of ≈ -28 MeV at density ρ 0 and an antikaon momentum of 800 MeV/c has been extracted in [39] from the data on elastic K − A scattering within Glauber theory.…”

Section: Introductionmentioning

confidence: 98%

Non-resonant kaon pair production and medium effects in proton–nucleus collisions

Paryev

Hartmann

Kiselev

2015

J. Phys. G: Nucl. Part. Phys.

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We study the non-resonant (non-φ) production of K + K − pairs by protons of 2.83 GeV kinetic energy on C, Cu, Ag, and Au targets within the collision model, based on the nuclear spectral function, for incoherent primary proton-nucleon and secondary pion-nucleon creation processes. The model takes into account the initial proton and final kaon absorption, target nucleon binding and Fermi motion as well as nuclear mean-field potential effects on these processes. We calculate the antikaon momentum dependences of the exclusive absolute and relative K + K − pair yields in the acceptance window of the ANKE magnetic spectrometer, used in a recent experiment performed at COSY, within the different scenarios for the antikaon-nucleus optical potential. We demonstrate that the above observables are strongly sensitive to this potential. Therefore, they can be useful to help determine the K − optical potential from the direct comparison of the results of our calculations with the data from the respective ANKE-at-COSY experiment. We also show that the pion-nucleon production channels dominate in the low-momentum K − , K + production in the considered kinematics and, hence, they have to be accounted for in the analysis of these data.

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Subthreshold and near-threshold kaon and antikaon production in proton–nucleus reactions

Akindinov¹,

Chumakov²,

Firoozabadi³

et al. 2009

J. Phys. G: Nucl. Part. Phys.

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The differential production cross sections of K + and K − mesons have been measured at the ITEP proton synchrotron in p + Be, p + Cu collisions under lab angle of 10.5 • , respectively, at 1.7 and 2.25, 2.4 GeV beam energies. A detailed comparison of these data with the results of calculations within an appropriate folding model for incoherent primary proton-nucleon, secondary pion-nucleon kaon and antikaon production processes and processes associated with the creation of antikaons via the decay of intermediate phi mesons is given. We show that the strangeness exchange process Y N → N N K − gives a small contribution to the antikaon yield in the kinematics of the performed experiment. We argue that in the case when antikaon production processes are dominated by the channels with KK − in the final state, the cross sections of the corresponding reactions are weakly influenced by the in-medium kaon and antikaon mean fields.

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Investigation of the subthreshold production of K − mesons in proton-nucleus collisions

Cited by 6 publications

References 23 publications

Meson–nucleus potentials and the search for meson–nucleus bound states

Meson–nucleus potentials and the search for meson–nucleus bound states

Non-resonant kaon pair production and medium effects in proton–nucleus collisions

Subthreshold and near-threshold kaon and antikaon production in proton–nucleus reactions

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