### Abstract

We investigate the photoproduction of the [Formula Presented] on a nucleon [Formula Presented] [Formula Presented] and the pion-induced [Formula Presented] production reaction on the proton [Formula Presented] The total cross sections near threshold are estimated by using hadronic models with effective interaction Lagrangians and form factors that preserve the gauge invariance of the electromagnetic current. The photoproduction cross sections are found to be a few hundred nb, with the cross section on the proton being larger than that on the neutron. The pion-induced production cross section is found to be around a few hundred [Formula Presented] but sensitive to the [Formula Presented] coupling whose value is not yet known. We also study the production cross section assuming that [Formula Presented] has negative parity. The cross sections are then found to be very suppressed compared to the case where [Formula Presented] has positive parity. Hence, the interpretation of the [Formula Presented] as an odd-parity pentaquark state seems to be disfavored from the estimates of the cross section for the photon-proton reaction from the SAPHIR experiment.

Original language | English |
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Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 69 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2004 Jan 1 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

### Cite this

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**Exotic [Formula Presented] baryon production induced by a photon and a pion.** / Oh, Yongseok; Kim, Hungchong; Lee, Su Houng.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Exotic [Formula Presented] baryon production induced by a photon and a pion

AU - Oh, Yongseok

AU - Kim, Hungchong

AU - Lee, Su Houng

PY - 2004/1/1

Y1 - 2004/1/1

N2 - We investigate the photoproduction of the [Formula Presented] on a nucleon [Formula Presented] [Formula Presented] and the pion-induced [Formula Presented] production reaction on the proton [Formula Presented] The total cross sections near threshold are estimated by using hadronic models with effective interaction Lagrangians and form factors that preserve the gauge invariance of the electromagnetic current. The photoproduction cross sections are found to be a few hundred nb, with the cross section on the proton being larger than that on the neutron. The pion-induced production cross section is found to be around a few hundred [Formula Presented] but sensitive to the [Formula Presented] coupling whose value is not yet known. We also study the production cross section assuming that [Formula Presented] has negative parity. The cross sections are then found to be very suppressed compared to the case where [Formula Presented] has positive parity. Hence, the interpretation of the [Formula Presented] as an odd-parity pentaquark state seems to be disfavored from the estimates of the cross section for the photon-proton reaction from the SAPHIR experiment.

AB - We investigate the photoproduction of the [Formula Presented] on a nucleon [Formula Presented] [Formula Presented] and the pion-induced [Formula Presented] production reaction on the proton [Formula Presented] The total cross sections near threshold are estimated by using hadronic models with effective interaction Lagrangians and form factors that preserve the gauge invariance of the electromagnetic current. The photoproduction cross sections are found to be a few hundred nb, with the cross section on the proton being larger than that on the neutron. The pion-induced production cross section is found to be around a few hundred [Formula Presented] but sensitive to the [Formula Presented] coupling whose value is not yet known. We also study the production cross section assuming that [Formula Presented] has negative parity. The cross sections are then found to be very suppressed compared to the case where [Formula Presented] has positive parity. Hence, the interpretation of the [Formula Presented] as an odd-parity pentaquark state seems to be disfavored from the estimates of the cross section for the photon-proton reaction from the SAPHIR experiment.

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U2 - 10.1103/PhysRevD.69.014009

DO - 10.1103/PhysRevD.69.014009

M3 - Article

VL - 69

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 1

ER -