Analysis of Φ Decay to 3γ Final States with the TELESIS

XU Guo-Fa; TONG Guo-Liang; HUANG Xiu-Ping; LV Feng; YU Guo-Wei

Chinese Physics C> 2002, Vol. 26> Issue(5) : 462-470

Analysis of Φ Decay to 3γ Final States with the TELESIS

Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
DAΦNE (Double Annular Φ factory for Nice Experiment) is the Frascati(Italy) electron positron collider operating at the energy of 510 MeV, a rather low energy with respect to the other existing factories. DAΦNE includes two collision points, and KLOE detector is located at one of these points. The KLOE detector is designed primarily for the goal of detecting direct CP violation in K⁰ decays with a sensitivity of ～10^－4 in R (ε′/ε), with a vast amount of other physics subjects. φ radiative dacays, especially its pure neutral final states are very important subjects to test the Chiral Perturbation Theory approach both in the anomalous and non-anomalous sectors. In this paper, a new kinematic fit method—TELESIS—is used for the data analysis of φ radiative decay φ→γη→3γ and φ→γπ⁰→3γ based on a part of 2000' data collected by KLOE detectors in DAΦNE, the φ produced cross section and the partial cross section of e⁺e^－→φ→γπ⁰→3γ have been obtained as follows:σe+e－→φ=(4.04±0.04±0.24)μb,σe+e－→φ→γπ0→3γ=(5.3±0.3±0.6)nb. These results are in good agreement with that of VEPP and theoretical predictions.

References

[1]

. Dell'Agnello S .The KLOE Detector. In:Bianco S et al.Physics and Detectors for DAΦNE .Frascati:SIS-Ufficio Publicazioni. 1999.381—391;TONG Guo-Liang. Physics, 2000, 29(3):169—173 (in Chinese) (童国梁.物理,2000,29(3):169—173)2. Ametller L .Electromagnetic η decays. In:Maiani L ,Pancheri G ,Paver N .The Second DAΦNE Physics Handbook. Frascati:SIS-Ufficio Publicazioni, 1995.427—444 3. O'Donnel P .Rev. Mod. Phys.,1981,53:673 4. O'Donnel P .Prog. Part. Nucl. Phys.,1997,39:2015. Bramon A ,Grau A ,Pancheri G .Phys. Lett.,1995,B334:2406. Benayoun M et al.Z .Phys.,1996,C72:2217. Achasov N et al. Int. J. Mod. Phys.,1992,A7:3187 8. XU Guo-Fa.The Analysis of Φ Decay to 3γ Final States by Using the TELESIS Method, KLOE Memo No.232/01 9. Antonelli A et al.GEANFI program-version 1. 2, KLOE Memo 23,3/93 10. Denig A .KLOE Luminosity Measurement, KLOE General Meeting, Dec. 11—12,200011. KLOE Collab. KLOE First Results on Hadronic Physics,30th International Conference on High Energy Physics, Osaka, Japan, hep-ex/0006036 12. Akhmetshin R R et al.hep-ex/000801913. Achasov N et al.hep-ex/0009036 14. Akhmetshin R R et al. Phys. Lett.,1999,B460:242—247;Kuraev E A ,Fadin V S .Sov. J. Nucl. Phys.,1985,41:46615. Achasov M N et al. J. Exp. Theo. Phys.,2000,90:17—2316. Achasov M N et al. hep-ex/9809013 17. Achasov M N et al. Eur. Phys. J.,2000,C12:25—33 18. Dolinsky S I et al. Phys. Rep.,1991,202:99—170

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XU Guo-Fa, TONG Guo-Liang, HUANG Xiu-Ping, LV Feng and YU Guo-Wei. Analysis of Φ Decay to 3γ Final States with the TELESIS[J]. Chinese Physics C, 2002, 26(5): 462-470.

XU Guo-Fa, TONG Guo-Liang, HUANG Xiu-Ping, LV Feng and YU Guo-Wei. Analysis of Φ Decay to 3γ Final States with the TELESIS[J]. Chinese Physics C, 2002, 26(5): 462-470. shu

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Received: 2001-05-09
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Analysis of Φ Decay to 3γ Final States with the TELESIS

Corresponding author: XU Guo-Fa,

Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2001-05-09
Accepted Date: 1900-01-01
Available Online: 2002-05-05

Abstract: DAΦNE (Double Annular Φ factory for Nice Experiment) is the Frascati(Italy) electron positron collider operating at the energy of 510 MeV, a rather low energy with respect to the other existing factories. DAΦNE includes two collision points, and KLOE detector is located at one of these points. The KLOE detector is designed primarily for the goal of detecting direct CP violation in K⁰ decays with a sensitivity of ～10^－4 in R (ε′/ε), with a vast amount of other physics subjects. φ radiative dacays, especially its pure neutral final states are very important subjects to test the Chiral Perturbation Theory approach both in the anomalous and non-anomalous sectors. In this paper, a new kinematic fit method—TELESIS—is used for the data analysis of φ radiative decay φ→γη→3γ and φ→γπ⁰→3γ based on a part of 2000' data collected by KLOE detectors in DAΦNE, the φ produced cross section and the partial cross section of e⁺e^－→φ→γπ⁰→3γ have been obtained as follows:σe+e－→φ=(4.04±0.04±0.24)μb,σe+e－→φ→γπ0→3γ=(5.3±0.3±0.6)nb. These results are in good agreement with that of VEPP and theoretical predictions.