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

Journal Article · Fri Feb 03 04:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.042002· OSTI ID:20777006

Liu, B C ^[1]; Zou, B S ^[2]

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1. Institute of High Energy Physics, P.O. Box 918(4), Beijing 100049 (China)
2. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080 (China)

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.

• OSTI ID: 20777006
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 96; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

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