Unitary coupled channel study of the {lambda}(1520) resonance
Abstract
We study the {lambda}(1520) resonance in a coupled channel approach involving the {pi}{sigma}(1385), K{xi}(1530), KbarN and {pi}{sigma} channels. Implementing unitarity in coupled channels, we make an analysis of the relative importance of the different mechanisms which contribute to the dynamical structure of this resonance. From experimental information on some partial wave amplitudes and constraints imposed by unitarity, we get a comprehensive description of the amplitudes and hence the couplings to the different channels. We test these amplitudes in different reactions like Kp {yields} {lambda}{pi}{pi}, {gamma}p {yields} K+Kp, {gamma}p {yields} K+{pi}0{pi}0{lambda} and {pi}p {yields} K0Kp and find a fair agreement with the experimental data.
 Authors:
 Departamento de Fisica Teorica, Institutos de Investigacion de Paterna, Aptdo. 22085, 46071 Valencia (Spain)
 (Spain)
 Publication Date:
 OSTI Identifier:
 20798077
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 2126 Aug 2005; Other Information: DOI: 10.1063/1.2176490; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; COUPLED CHANNEL THEORY; KAONHYPERON INTERACTIONS; KAONS; LAMBDA1520 BARYONS; NUCLEONS; PARTIAL WAVES; PARTICLE PROPERTIES; PIONHYPERON INTERACTIONS; RESONANCE PARTICLES; SIGMA BARYONS; UNITARITY; XI BARYONS
Citation Formats
Roca, L., Magas, V. K., Oset, E., Sarkar, Sourav, and IFIC, Centro Mixto Universidad de ValenciaCSIC, Institutos de Investigacion de Paterna, Aptdo. 22085, 46071 Valencia. Unitary coupled channel study of the {lambda}(1520) resonance. United States: N. p., 2006.
Web. doi:10.1063/1.2176490.
Roca, L., Magas, V. K., Oset, E., Sarkar, Sourav, & IFIC, Centro Mixto Universidad de ValenciaCSIC, Institutos de Investigacion de Paterna, Aptdo. 22085, 46071 Valencia. Unitary coupled channel study of the {lambda}(1520) resonance. United States. doi:10.1063/1.2176490.
Roca, L., Magas, V. K., Oset, E., Sarkar, Sourav, and IFIC, Centro Mixto Universidad de ValenciaCSIC, Institutos de Investigacion de Paterna, Aptdo. 22085, 46071 Valencia. Sat .
"Unitary coupled channel study of the {lambda}(1520) resonance". United States.
doi:10.1063/1.2176490.
@article{osti_20798077,
title = {Unitary coupled channel study of the {lambda}(1520) resonance},
author = {Roca, L. and Magas, V. K. and Oset, E. and Sarkar, Sourav and IFIC, Centro Mixto Universidad de ValenciaCSIC, Institutos de Investigacion de Paterna, Aptdo. 22085, 46071 Valencia},
abstractNote = {We study the {lambda}(1520) resonance in a coupled channel approach involving the {pi}{sigma}(1385), K{xi}(1530), KbarN and {pi}{sigma} channels. Implementing unitarity in coupled channels, we make an analysis of the relative importance of the different mechanisms which contribute to the dynamical structure of this resonance. From experimental information on some partial wave amplitudes and constraints imposed by unitarity, we get a comprehensive description of the amplitudes and hence the couplings to the different channels. We test these amplitudes in different reactions like Kp {yields} {lambda}{pi}{pi}, {gamma}p {yields} K+Kp, {gamma}p {yields} K+{pi}0{pi}0{lambda} and {pi}p {yields} K0Kp and find a fair agreement with the experimental data.},
doi = {10.1063/1.2176490},
journal = {AIP Conference Proceedings},
number = 1,
volume = 814,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2006},
month = {Sat Feb 11 00:00:00 EST 2006}
}

We study the {lambda}(1520) resonance in a coupledchannel approach involving the {pi}{sigma}(1385),K{xi}(1530),KN, and {pi}{sigma} channels. Implementing unitarity in coupled channels, we make an analysis of the relative importance of the different mechanisms that contribute to the dynamical structure of this resonance. From experimental information on some partial wave amplitudes and constraints imposed by unitarity, we get a comprehensive description of the amplitudes and hence the couplings to the different channels. We test these amplitudes in different reactions like K{sup }p{yields}{lambda}{pi}{pi},{gamma}p{yields}K{sup +}K{sup }p,{gamma}p{yields}K{sup +}{pi}{sup 0}{pi}{sup 0}{lambda}, and {pi}{sup }p{yields}K{sup 0}K{sup }p and find a fair agreement with the experimental data.

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We investigate photoproduction of {phi} mesons off protons within a coupledchannel effectiveLagrangian method which is based on the Kmatrix approach. Since the threshold energy of the K{lambda}(1520) channel is close to that of {phi}N, the contribution of this channel to {phi} photoproduction near the threshold energy region may give rise to some unexpected structures. In the transition amplitude K{lambda}(1520){yields}{phi}N, the kinematics allows an intermediate kaon to be onshell. This happens in the energy region where a peak structure has been observed in {phi} photoproduction. In our calculations, the onshell kaon effect indeed reproduces a peak structure, though with a magnitudemore »