Searching for signatures around 1920 MeV of a N state of three hadron nature

Martinez-Torres, A.; Oset, E.; Meissner, U.G.; Khemchandani, K.-P

doi:10.1140/epja/i2009-10834-2

Journal Article

PreJuSER-8629

Searching for signatures around 1920 MeV of a N state of three hadron nature

Martinez-Torres, A. ; Khemchandani, K.-P. ; Meissner, U. G.FZJ* ; Oset, E.

2009
Springer Berlin

The European physical journal / A 41, 361 - 368 (2009) [10.1140/epja/i2009-10834-2]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10379 doi:10.1140/epja/i2009-10834-2

Abstract: We provide a series of arguments which support the idea that the peak seen in the gamma p -> K+ Lambda reaction around 1920 MeV should correspond to the recently predicted state of J(P) = 1/2(+) as a bound state of K(K) over bar N with a mixture of alpha(0)(980)N and f(0)(980)N components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross-section for gamma p -> K(+)K(-)p at energies close to threshold and of d sigma/dM(inv) for invariant masses close to the two-kaon threshold.

Keyword(s): K: bound state ; total cross section ; polarization ; photon p: exclusive reaction ; Lambda: hadroproduction ; K+: associated production ; angular distribution ; nucleon resonance: (1920) ; bound state: (nucleon K anti-K) ; a0(980): intermediate state ; f0(980): intermediate state ; interpretation of experiments ; proposed experiment ; photon p --> Lambda K+ ; photon p --> Sigma0 K+ ; photon p --> p K+ K-

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Note: We would like to thank J. Nieves and T. Nakano for useful discussions. This work is partly supported by DGICYT contract number FIS2006-03438. We acknowledge the support of the European Community-Research Infrastructure Integrating Activity "Study of Strongly Interacting Matter" (acronym HadronPhysics2, Grant Agreement n. 227431) under the Seventh Framework Programme of EU. This work is supported in part by DFG (SFB/TR 16, "Subnuclear Structure of Matter"), and by the Helmholtz Association through funds provided to the virtual institute " Spin and strong QCD" (VH-VI-231). One of the authors (A. M. T.) is supported by a FPU grant of the Ministerio de Ciencia y Tecnologia. K. P. Khemchandani thanks the support by the Fundacao para a Ciencia e a Tecnologia of the Ministerio da Ciencia, Tecnologia e Ensino Superior of Portugal (SFRH/BPD/40309/2007).

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