# 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:

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

}