Mass and K{lambda} Coupling of the N*(1535)
- Institute of High Energy Physics, P.O. Box 918(4), Beijing 100049 (China)
- 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
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BREIT-WIGNER FORMULA
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ETA MESONS
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ISOBAR MODEL
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KAONS PLUS
LAGRANGIAN FUNCTION
LAMBDA PARTICLES
MASS
N-1535 BARYONS
PROTON-PROTON INTERACTIONS