K- C12 --> 2LAMBDA K+ X
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Enhanced production of Lambda Lambda pairs near threshold in the (K-,K+) reaction.

The KEK-PS E224 collaboration Ahn, J.K. ; Aoki, S. ; Chung, K.S. ; et al.
Nucl.Phys.A 639 (1998) 379-384, 1998.
Inspire Record 481839 DOI 10.17182/hepdata.38519

Enhanced production of ΛΛ pairs, above the prediction of a two-step process model, is observed near threshold (around the masses of 2.23 – 2.26 GeV/c 2 ) in the 12 C(K − ,K + ) reaction at P K − = 1.66GeV/c using a scintillating fiber target. The differential cross section for the ΛΛ production averaged over 2.3° ≤ $$ K + ≤ 14.7° in the momentum region 0.95 ≤ p K + ≤ 1.3GeV/c was found to be 7.6 ± 1.3 μb/sr, and that for the enhancement approximately 3 μb/sr.

4 data tables
Table 1

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Table 2

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Table 3

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Enhanced Lambda Lambda production near threshold in the C-12(K-,K+) reaction.

The KEK-PS E224 collaboration Ahn, J.K. ; Aoki, S. ; Chung, K.S. ; et al.
Phys.Lett.B 444 (1998) 267-272, 1998.
Inspire Record 471664 DOI 10.17182/hepdata.38417

Enhanced production of ΛΛ pairs, above levels predicted by a two-step process model, has been observed near threshold (in the mass range 2.23-2.26 GeV/ c 2 ) in the 12 C( K − , K + ) reaction at 1.66 GeV/ c using a scintillating fiber target. The differential cross section for ΛΛ production in the momentum region 0.95≤ p K + ≤1.3 GeV/ c averaged over the range 2.3 o ≤ θ K + ≤14.7 o was found to be 7.6±1.3 ±0.9 μ b/sr, and that for the enhancement was found to be approximately 3 μ b/sr.

1 data table
Table 1

No description provided.


Scalar and vector meson production and two-step processes in the (K-,K+) reaction on C-12.

The E224 collaboration Ahn, J.K. ; Aoki, S. ; Chung, K.S. ; et al.
Nucl.Phys.A 625 (1997) 231-250, 1997.
Inspire Record 439760 DOI 10.17182/hepdata.36465

The double strangeness exchange reaction ( K − , K + ) is investigated with respect to the sub-threshold production of scalar and vector mesons ( f 0 / a 0 / φ ) decaying into K + K − and the two-step processes induced by intermediate mesons and Ξ − hyperons at p k − = 1.66 GeV/ c using a scintillating fiber active target. The differential cross section ( 〈 dσ dΩ L 〉) averaged over the angular interval (2.3° ⩽ θ K + L ⩽ 14.7°) for the sub-threshold f 0 / a 0 / φ meson production with the K + K − decay is 11 ± 6 μ b/sr at 0.6 ⩽ p K 1 < 0.95 GeV/ c . The present result differs significantly from the theoretical calculation which predicts the contribution of the f 0 / a 0 / φ meson production to be predominant in the ( K − , K + ) reaction below p K + = 0.95 GeV/ c . We found a sizable contribution from two-step ( K − , K + processes, characterized by production of two S = −1 hyperons, consistent with the result of the intra-nuclear cascade (INC) model calculation with respect to the meson-induced hyperon (or hyperon resonance) pair production in the momentum region 0.6 ⩽ p K + < 0.95 GeV/ c . The observed enhancement of the cross section for the two-step ΛΛ production beyond the prediction of the INC model at p K + ⋍ 1.1 GeV /c could be due to the Ξ − p → ΛΛ reaction in 12 C.

6 data tables
Table 1

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Table 2

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Table 3

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