Multiquark picture for Sigma (1620)

Authors
Citation
S. Choe, Multiquark picture for Sigma (1620), EUR PHY J A, 7(3), 2000, pp. 441-448
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL A
ISSN journal
1434-6001 → ACNP
Volume
7
Issue
3
Year of publication
2000
Pages
441 - 448
Database
ISI
SICI code
1434-6001(200003)7:3<441:MPFS(>2.0.ZU;2-D
Abstract
In this work we report on a new QCD sum rule analysis to predict masses of the excited baryon states (e.g. Sigma (1620) and Lambda (1405)) by using mu ltiquark interpolating fields ((q (q) over bar)(qqq)). For the Sigma C (162 0) we consider the (K) over bar N, pi Sigma, and pi Lambda (I=1) multiquark interpolating fields. The calculated mass from those multiquark states is about 1.592 GeV. For the Lambda (1405) we first sinew the result using the pi(+)Sigma(-) + pi(0)Sigma(0) + pi(-)Sigma(+) (I=0) multiquark interpolatin g field, and compare the calculated mass to that of our previous result usi ng the pi(0)Sigma(0) multiquark state. We then show that the mass 1.405 GeV is well reproduced when using the (K) over bar N (I=0) multiquark state. T he uncertainties in our sum rules are also discussed.