The prototype of a K̄ nuclear cluster, K−pp, has been investigated using effective K̄N potentials based on chiral SU(3) dynamics. Variational calculation shows a bound state solution with shallow binding energy B(K−pp) = 20±3 MeV and broad mesonic decay width Γ (K̄NN → πY N) = 40 70 MeV. The K̄N(I = 0) pair in the K−pp system exhibits a similar structure as the Λ(1405). We have also estimated the d...

Two coupled channel effects connected with kaon pair production in proton-proton collisions are discussed. (1) Although there is ample evidence that the antikaon is strongly attracted to the recoil protons in pp → Kp {K−p}, residual effects of the KK interaction are seen, including a possible cusp at the KK̄ threshold. This is investigated within a simple K-matrix approach. (2) The production ra...

References 1. I. Gelfand, Normierte Ringe, Rec. Math. (Mat. Sbornik) N.S. vol. 9 (1941) pp. 3-24. 2. I. Gelfand and M. Neumark, On the embedding of normed rings into the ring of operators in Hubert Space, Rec. Math. (Mat. Sbornik) N.S. vol. 12 (1943) pp. 197213. 3. L. J. Heider, A note on a theorem of K. G. Wolf son, Proc. Amer. Math. Soc. vol. 6 (1955) pp. 305-308. 4. N. Jacobson, The theory o...

Consider the ( n 2 ) (or O(n2)) min-cut problems on a graph with n nodes and nonnegative edge weights. Gomory and Hu [J. Soc. Indust. Appl. Math., 9 (1961), pp. 551–570] showed (essentially) that there are at most n−1 different min-cuts. They also described a compact structure (the flow equivalent tree) of size O(n) with the following property: for any pair of nodes, the value of a min-cut can ...

We have studied the structure of K−pp comprehensively by solving this threebody system in a variational method, starting from the Ansatz that the Λ(1405) resonance (≡ Λ∗) is a K−p bound state. The structure of K−pp reveals a molecular feature, namely, the K− in Λ∗ as an “atomic center” plays a key role in producing strong covalent bonding with the other proton. We point out that strongly bound ...

Three strains of facultatively anaerobic thermotolerant and moderately halophilic bacteria were isolated from two Jordanian hot spring locations. The novel Bacillus strains were short rods, Gram-positive, motile and spore formers. The strains were capable of anaerobic (but not aerobic) growth at 63C, moderately halophilic, able to grow at NaCl concentration range of 12 15 % and at temperatures ...

The aim of this study was to test the genotypes effect of DGAT1 gene on breeding value in Iranian Holstein milk production traits. For this purpose, 103 semen samples of registered bulls were collected and then genotyped for partial region of DGAT1 gene. The studied traits were milk yield (MY), fat yield (FY), protein yield (PY), fat percentage (FP) and protein percentage (PP). First lactation ...

Measurements of the pp→ ppK+K− reaction, performed near the kinematical threshold with the experiment COSY-11 at the Cooler Synchrotron COSY, reveal a significant discrepancy between obtained excitation function and theoretical expectations neglecting interactions of kaons. In order to deepen our knowledge about the low energy dynamics of the ppKK system we investigated population of events for...

We show that the recently measured asymmetry in helicity-angle spectra of the Λ-hyperons produced in the reaction pp→K + Λp reaction and the energy dependence of the total pp→K + Λp cross section can be explained consistently by the same Λp final-state interaction. Assuming that there is no final-state interaction in the Σ 0 p channel, as suggested by the available data, we can also reproduce t...