Study of K<SUP>*</SUP>(892) mass and width splitting caused by model difference

LI Xiu-Rong; YUAN Chang-Zheng

doi:10.1088/1674-1137/33/5/001

Chinese Physics C> 2009, Vol. 33> Issue(5) : 321-326 DOI: 10.1088/1674-1137/33/5/001

Study of K^*(892) mass and width splitting caused by model difference

LI Xiu-Rong ^, ,
YUAN Chang-Zheng

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Abstract：
According to the new K^*(892)⁰ and K^*(892)^－ masses reported by the BELLE experiment and the K^*(892)⁰ mass reported by the FOCUS experiment, mass splitting between neutral and charged K^*(892) becomes very small. This is significantly different from the current world average values given by the Particle Data Group 2008. We find that there are differences between models used to fit the K^*(892) decay invariant mass spectra in different measurements and study the model dependence in the measurement of K^*(892) parameters. We refit
the K^*(892)⁰ mass spectra of the BELLE and FOCUS experiments with the formula used by BELLE in fitting K^*(892)^－ to get new mass and width. After refitting, the K^*(892)⁰ mass of the BELLE experiment becomes 1.4 MeV/c² larger than the initial value and that of the FOCUS experiment is 1 MeV/c² smaller than the initial value. We also fit the spectra of some other experiments to extract the K^*(892) parameters using the BELLE K^*(892)^－ parametrization.

References

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. Schechter J, Subbaraman A, Weigel H. Phys. Rev. D, 1993,48: 339 [arXiv: hep-ph/9211239]2. GAO Dao-Neng, YAN Mu-Lin. Eur. Phys. J. A, 1998, 3:2933. GAO Dao-Neng, YAN Mu-Lin. arXiv: 0710.2810 [hep-ph]4. Amsler C et al. (Particle Data Group). Phys. Lett. B, 2008,667: 15. Epifanov D et al. (BELLE Collaboration). Phys. Lett. B,2007, 654: 65 [arXiv: 0706.2231 [hep-ex]]6. Adachi I. (BELLE Collaboration). arXiv: 0808.1059 [hep-ex]7. Link J M et al. (FOCUS Collaboration). Phys. Lett. B,2005, 621: 72 [arXiv: hep-ex/0503043]8. Jackson J D. Nuovo Cim., 1964, 34: 16449. Napier A et al. Phys. Lett. B, 1984, 149: 51410. Cooper-Sarkar A M et al. (Bombay-CERN-College de France-Madrid Collaboration). Nucl. Phys. B, 1978, 136:36511. Paler K et al. Nucl. Phys. B, 1975, 96: 112. Atkinson M et al. (Omega Photon Collaboration). Z. Phys.C, 1986, 30: 52113. Baland J F et al. Nucl. Phys. B, 1978, 140: 22014. Dauber P M et al. Physical Review, 1967, 153: 1403

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LI Xiu-Rong and YUAN Chang-Zheng. Study of K^*(892) mass and width splitting caused by model difference[J]. Chinese Physics C, 2009, 33(5): 321-326. doi: 10.1088/1674-1137/33/5/001

LI Xiu-Rong and YUAN Chang-Zheng. Study of K^*(892) mass and width splitting caused by model difference[J]. Chinese Physics C, 2009, 33(5): 321-326. doi: 10.1088/1674-1137/33/5/001 shu

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Received: 2008-10-14
Revised: 2008-11-20

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of K^*(892) mass and width splitting caused by model difference

Corresponding author: LI Xiu-Rong,

Received Date: 2008-10-14

Accepted Date: 2008-11-20

Available Online: 2009-05-05

Abstract:

According to the new K^*(892)⁰ and K^*(892)^－ masses reported by the BELLE experiment and the K^*(892)⁰ mass reported by the FOCUS experiment, mass splitting between neutral and charged K^*(892) becomes very small. This is significantly different from the current world average values given by the Particle Data Group 2008. We find that there are differences between models used to fit the K^*(892) decay invariant mass spectra in different measurements and study the model dependence in the measurement of K^*(892) parameters. We refit
the K^*(892)⁰ mass spectra of the BELLE and FOCUS experiments with the formula used by BELLE in fitting K^*(892)^－ to get new mass and width. After refitting, the K^*(892)⁰ mass of the BELLE experiment becomes 1.4 MeV/c² larger than the initial value and that of the FOCUS experiment is 1 MeV/c² smaller than the initial value. We also fit the spectra of some other experiments to extract the K^*(892) parameters using the BELLE K^*(892)^－ parametrization.

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Study of K*(892) mass and width splitting caused by model difference

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Study of K^*(892) mass and width splitting caused by model difference

Study of K^*(892) mass and width splitting caused by model difference