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Prog. Theor. Phys. Vol. 87 No. 3 (1992) pp. 781-784
Letters
Where Is the Σb?
Chiaki Itoh,
Toshiyuki Minamikawa,*
Kimio Miura** and
Tsunetoshi Watanabe***
Department of Physics, Meiji-Gakuin University, Totsuka 244
*Department of Physics, Tokyo University of Mercantile Marine, Tokyo 135
**Department of Physics, Nippon Ika University, Kawasaki 211
***Department of Physics, Asia University, Musasino 180
(Received November 15, 1991)
Abstract:
The masses of s-wave bottom baryons are discussed in a semirelativistic quark model, on the basis of a quark-distance relation. We stress that the Σb is heavier than Ξ′b(b[su], b[sd]) containing the antisymmetric su(or sd) subsystem. We conclude that the two candidates for Λb with very different masses are different states; Basile et al.'s result 5425+175-75 MeV is Λb(b[du]), but Arenton et al.'s result ∼5750 MeV is Ξ′0b(b[su]).
URL :
http://ptp.ipap.jp/link?PTP/87/781/
DOI : 10.1143/PTP.87.781
References:
- Particle Data Group, J. J. Hernández et al., Phys. Lett. B239 (1990), 1.
- M. Basile et al., Lett. Nuovo Cim. 31 (1981), 97.
M. W. Arenton et al., Nucl. Phys. B274 (1986), 707.
-
C. Itoh, T. Minamikawa, K. Miura and T. Watanabe, Phys. Rev. D40 (1989), 3660[APS].
- NA14/2 Collaboration, M. P. Alvarez et al., Phys. Lett. B246 (1990), 256.
- P. L. Frabetti et al., Phys. Lett. B251 (1990), 639.
- C. Itoh, T. Minamikawa, K. Miura and T. Watanabe, Bull. Meiji-Gakuin Univ. 2 (1979), 11.
- J. Cohen and H. J. Weber, Phys. Lett. 165B (1985), 229.
We would like to thank Dr. M. Gupta for suggesting this reference.
- C. Itoh, T. Minamikawa, K. Miura and T. Watanabe, in preparation.
