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Title: Mass and K{lambda} Coupling of the N*(1535)

Abstract

Using a resonance isobar model and an effective Lagrangian approach, from recent BES results on J/{psi}{yields}pp{eta} and {psi}{yields}pK{sup +}{lambda}, we deduce the ratio between effective coupling constants of N*(1535) to K{lambda} and p{eta} to be R{identical_to}g{sub N*(1535)K{lambda}}/g{sub N*(1535)p{eta}}=1.3{+-}0.3. With the previous known value of g{sub N*(1535)p{eta}}, the obtained new value of g{sub N*(1535)K{lambda}} is shown to reproduce recent pp{yields}pK{sup +}{lambda} near-threshold cross section data as well. Taking into account this large N*K{lambda} coupling in the coupled channel Breit-Wigner formula for the N*(1535), its Breit-Wigner mass is found to be around 1400 MeV, much smaller than the previous value of about 1535 MeV obtained without including its coupling to K{lambda}. The implication on the nature of N*(1535) is discussed.

Authors:
 [1];  [2];  [3];  [4]
  1. Institute of High Energy Physics, P.O. Box 918(4), Beijing 100049 (China)
  2. (China)
  3. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)
  4. (4), Beijing 100049 (China)
Publication Date:
OSTI Identifier:
20777006
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevLett.96.042002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BREIT-WIGNER FORMULA; COUPLED CHANNEL THEORY; COUPLING CONSTANTS; CROSS SECTIONS; ETA MESONS; GEV RANGE 01-10; HADRONIC PARTICLE DECAY; ISOBAR MODEL; J PSI-3097 MESONS; KAONS PLUS; LAGRANGIAN FUNCTION; LAMBDA PARTICLES; MASS; N-1535 BARYONS; PROTON-PROTON INTERACTIONS

Citation Formats

Liu, B.C., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Zou, B.S., and Institute of High Energy Physics, P.O. Box 918. Mass and K{lambda} Coupling of the N*(1535). United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.042002.
Liu, B.C., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Zou, B.S., & Institute of High Energy Physics, P.O. Box 918. Mass and K{lambda} Coupling of the N*(1535). United States. doi:10.1103/PhysRevLett.96.042002.
Liu, B.C., Graduate School of the Chinese Academy of Sciences, Beijing 100049, Zou, B.S., and Institute of High Energy Physics, P.O. Box 918. Fri . "Mass and K{lambda} Coupling of the N*(1535)". United States. doi:10.1103/PhysRevLett.96.042002.
@article{osti_20777006,
title = {Mass and K{lambda} Coupling of the N*(1535)},
author = {Liu, B.C. and Graduate School of the Chinese Academy of Sciences, Beijing 100049 and Zou, B.S. and Institute of High Energy Physics, P.O. Box 918},
abstractNote = {Using a resonance isobar model and an effective Lagrangian approach, from recent BES results on J/{psi}{yields}pp{eta} and {psi}{yields}pK{sup +}{lambda}, we deduce the ratio between effective coupling constants of N*(1535) to K{lambda} and p{eta} to be R{identical_to}g{sub N*(1535)K{lambda}}/g{sub N*(1535)p{eta}}=1.3{+-}0.3. With the previous known value of g{sub N*(1535)p{eta}}, the obtained new value of g{sub N*(1535)K{lambda}} is shown to reproduce recent pp{yields}pK{sup +}{lambda} near-threshold cross section data as well. Taking into account this large N*K{lambda} coupling in the coupled channel Breit-Wigner formula for the N*(1535), its Breit-Wigner mass is found to be around 1400 MeV, much smaller than the previous value of about 1535 MeV obtained without including its coupling to K{lambda}. The implication on the nature of N*(1535) is discussed.},
doi = {10.1103/PhysRevLett.96.042002},
journal = {Physical Review Letters},
number = 4,
volume = 96,
place = {United States},
year = {Fri Feb 03 00:00:00 EST 2006},
month = {Fri Feb 03 00:00:00 EST 2006}
}