TY - JOUR
T1 - Traces of the Θ+ pentaquark in K+-nucleus dynamics
AU - Gal, A.
AU - Friedman, E.
PY - 2005/2/25
Y1 - 2005/2/25
N2 - Long-standing anomalies in K+-nucleus integral cross sections could be resolved by extending the impulse-approximation tρ optical-potential framework to incorporate K+ absorption on pairs of nucleons. Substantially improved fits to the data at plab ∼ 500-700 MeV/c are obtained. An upper bound on the absorption cross section per nucleon is derived, σabs(K+)/A ∼ 3.5 mb. We conjecture that the underlying microscopic absorption process is K+ nN →+ N, where Θ+ (1540) is the newly discovered exotic Y = 2, 1 = 0, Z = 1 pentaquark baryon, and estimate that σ(K+ d →Θ+ p) is a fraction of millibarn. Comments are made on Θ+ production reactions on nuclei.
AB - Long-standing anomalies in K+-nucleus integral cross sections could be resolved by extending the impulse-approximation tρ optical-potential framework to incorporate K+ absorption on pairs of nucleons. Substantially improved fits to the data at plab ∼ 500-700 MeV/c are obtained. An upper bound on the absorption cross section per nucleon is derived, σabs(K+)/A ∼ 3.5 mb. We conjecture that the underlying microscopic absorption process is K+ nN →+ N, where Θ+ (1540) is the newly discovered exotic Y = 2, 1 = 0, Z = 1 pentaquark baryon, and estimate that σ(K+ d →Θ+ p) is a fraction of millibarn. Comments are made on Θ+ production reactions on nuclei.
UR - http://www.scopus.com/inward/record.url?scp=18244406536&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.94.072301
DO - 10.1103/PhysRevLett.94.072301
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AN - SCOPUS:18244406536
SN - 0031-9007
VL - 94
JO - Physical Review Letters
JF - Physical Review Letters
IS - 7
M1 - 072301
ER -