Comparison of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Σ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Production near Threshold in Proton-Proton Collisions

Sewerin, Sebastian; Schepers, G.; Balewski, J. T.; Budzanowski, A.; Eyrich, W.; Fritsch, M.; Goodman, C.D.; Grzonka, D.; Haidenbauer, J.; Hanhart, C.; Hofmann, M.; Jarczyk, L.; Jochmann, M.; Khoukaz, A.; Kilian, K.; Köhler, M. K.; Lister, Tim; Moskal, P.; Oelert, W.; Pellmann, I.; Quentmeier, C.; Santo, R.; Seddik, U.; Sefzick, T.; Smyrski, J.; Stinzing, F.; Strzalkowski, A.; Wilkin, C.; Wolke, M.; Wüstner, P.; Wyrwa, D.

doi:10.1103/physrevlett.83.682

Cited by 90 publications

(99 citation statements)

References 32 publications

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“…In the energy range up to Q = 13 MeV the energy dependence is better described by a phase space behaviour modified by the proton-hyperon final state interaction (FSI) than by a pure phase space behaviour [2]. However, the most striking feature of the data is the observed Σ 0 suppression with…”

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 66%

“…Exclusive data on Λ and Σ 0 production in proton-proton scattering have been taken at the COSY-11 facility at equal excess energies close to threshold [1,2]. In the energy range up to Q = 13 MeV the energy dependence is better described by a phase space behaviour modified by the proton-hyperon final state interaction (FSI) than by a pure phase space behaviour [2].…”

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

“…Total cross sections for the reactions pp → pK + Λ/Σ 0 obtained at the COSY-11 (circles and squares [1,2,16]) and COSY-TOF (triangle [22]) facilities up to excess energies of Q = 60 MeV are shown in figure 2. [1,2], solid triangle from [22], open symbols from [16]) as functions of the excess energy.…”

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

“…[1,2], solid triangle from [22], open symbols from [16]) as functions of the excess energy. Dotted and solid lines denote fits of the energy dependence assuming a pure phase space behaviour and a phase space dependence modified by the proton hyperon FSI parameterized according to [23].…”

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

“…0 production ratio in proton-proton collisions as a function of the excess energy. Experimental data within the shaded area, which corresponds to the range given in relation (1), are from [2], data at higher excess energies from [16]. Calculations [17] are performed within the Jülich meson exchange model, assuming a destructive interference of K and π exchange and employing the microscopic Y N interaction models Nijmegen NSC89 (dashed line [18]) and the new Jülich model (solid line [19]), respectively.…”

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

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Kaon Production and Interaction

Wolke¹

2003

Meson 2002

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Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 66%

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

Section: Exclusive Kaon-hyperon Experiments In Proton-proton Collisionsmentioning

confidence: 99%

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Kaon Production and Interaction

Wolke¹

2003

Meson 2002

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Near threshold production of the pseudoscalar mesons at the COSY-11 facility

et al. 2008

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We summarise measurements of the COSY-11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the proton-proton interaction. The results are discussed in the context of the meson-nucleon and hyperon-nucleon interactions. We conclude that the η-proton interaction is significantly stronger than the η ′ -proton interaction. Similarly, we found that the hyperon Λ interacts with the nucleon considerably stronger than the hyperon Σ, and that the interaction of K − -proton is much stronger than this of the K + -proton.

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Associated strangeness production at threshold

Kowina

Wolke

Adam

et al. 2003

Refereed and Selected Contributions From International Conference on Quark Nuclear Physics

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The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon-and the K + K − meson pair production. Measurements of the near threshold Λ and Σ 0 production via the pp → pK + Λ/Σ 0 reaction [1] at COSY-11 have shown that the Λ/Σ 0 cross section ratio exceeds the value at high excess energies (Q ≥ 300 MeV [2]) by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. The near threshold production of the charged kaon-antikaon pair is related to the discussion about the nature of the scalar states in the 1 GeV/c 2 mass range, i.e. the f0 (980) and a0 (980) [3]. The interpretation as a KK molecule is strongly dependent on the K-K interaction which can be studied via the production channel. A first total cross section value on the reaction pp → ppK + K − at an excess energy of 17 MeV [4] i.e. below the φ production threshold was measured. PACS. 13.75.-n , 14.20.Jn, 14.40.Aq, 25.40.Ep 1 THE Λ/Σ 0 PRODUCTION RATIO CLOSE TO THRESHOLD One of the main investigations of the COSY-11 collaboration is the associated strangeness production of the neutral Λ and Σ 0 hyperons in the reactions pp → pK + Λ/Σ 0. Since the quark structures of these hyperons are analogous to each other one can expect similar production mechanisms. In such a case the cross section ratio R Λ/Σ 0 ≡ σ(pp→pK + Λ) σ(pp→pK + Σ 0) should be mainly determined by the isospin relation which leads to R Λ/Σ 0 = 3 what is in line with the ratio of about 2.5 observed at high excess energies (Q ≥ 300 MeV) [2]. Very close to threshold, in the range of excess energies Q ≤ 13 MeV, the total cross sections for the Λ and Σ 0 hyperon production were measured exclusively at the COSY-11 facility [5,6] at COSY Jülich [7]. The most remarkable feature of the data [1,8] was that at the same excess energy the total cross section for the Σ 0 production appeared to be about a factor of 28 +6 −9 smaller than for the Λ particle. Enhancements in the missing mass distribution at the Λp and ΣN thresholds observed in inclusive K + production data, taken at SPES 4 [9] in proton-proton scattering at Q = 252 MeV, both having about the same magnitude, suggest a strong ΣN → Λp final state conversion. This conversion might be responsible for the decrease of the Σ 0 production yield close to threshold as seen in the COSY-11 data. Strong ΣN → Λp conversion effects are also suggested when interpreting the results of K − scattering on deuterons [10] where a sharp peak is clearly seen at an effective mass of the Λ-proton system m Λp = 2131 MeV/c 2 corresponding exactly to the Σ 0 p threshold. However, in calculations within the Jülich meson exchange model [11] the final state conversion is rather excluded as a dominant origin of the observed Σ 0 suppression. In these calculations both π and K exchange are taken into account with inclusion of the final state interaction (FSI) effects. Λ production is found to be dominated by kaon exchange, what is in line with the experimental re...

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Comparison ofΛandΣ0Production near Threshold in Proton-Proton Collisions

Cited by 90 publications

References 32 publications

Kaon Production and Interaction

Kaon Production and Interaction

Near threshold production of the pseudoscalar mesons at the COSY-11 facility

Associated strangeness production at threshold

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