Traces of Theta^+ pentaquark in K^+ nucleus dynamics

Details Traces of Theta^+ pentaquark in K^+ nucleus dynamics Traces of Theta^+ pentaquark in K^+ nucleus dynamics

2004-11-12

arxiv.org/abs/nucl-th/0411052v3

Phys.Rev.Lett. 94 (2005) 072301

Physics

Nuclear Physics

Nuclear Theory

4 double-column pages, 1 figure, extended results and discussion, final form accepted for publication in PRL

Scientific paper

Long-standing anomalies in K^+ nucleus integral cross sections could be resolved by extending the impulse-approximation t*rho optical-potential framework to incorporate K^+ absorption on pairs of nucleons. Substantially improved fits to the data at p(lab)=500-700 MeV/c are obtained. An upper bound of 3.5 mb for the absorption cross section of K^+ per nucleon is derived. We conjecture that the underlying microscopic absorption process is K^+ n N --> Theta^+ N, where Theta^+(1540) is the newly discovered exotic Y=2, I=0, Z=1 pentaquark baryon, and estimate that the cross section for K^+ d --> Theta^+ p is a fraction of millibarn. Comments are made on Theta^+ production reactions on nuclei.

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