Measurement of Production Cross Section of Ds+Ds in e+e Annihilation at the Center-of-Mass Energy of s=4.03GeV

  • Measurement of the production cross section of the D+s D- s in e+e- annihilation at the Center-of-Mass Energy of s=4.03 GeV is reported in the paper. The cross section for the D+s D- s production has been measured using a data sample of 22.3 pb-1 collected with BES detector at BEPC e+e- collider. The D+ s measons are reconstructed in the π+,K*0 K+ and K0K+ decay modes. A total number of 94±13 singly tagged D+ s events is obtained from the three modes. This yelds the cross section value σ prod D+s D- s=(451±63±118)pb for D+ s D- s production. Based on the numbers of singly tagged D+ s events for each of the three decay modes,the decay branching fractions for D+ s→K *0 K+ and K0K+ have been determined to be (3.02±0.94±0.91)% and (3.28±1.22±0.94)%,respectively.
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  • [1] . Eichten E et al.Phys.Rev .,1980 ,D21:203 ;Lockman W S .MarkⅢMrmorandum .D and D,Production in the Range 3 .8√span style="border-top: 1px solid; padding-top: 0px;"s/span4.5GeV,19872. DING Hui-Liang et al.High Energy Phys.and Nucl.Phys.,1992 ,16(9) :769— 789(in Chinese) ;(丁慧良等 .高能物理与核物理,1992 ,16(9):769—789)BAIJing-Zhi et al.NIM .,1994 ,A344:319—3343. BAI Jing-Zhi et al(BES Collab .) .Phys.Rev.D,1995,52 (7) :3781—37844. BAI Jing-Zhi et al(BES Collab.) .Phys.Rev.Lett.,1 995,74 (23) :4599—4602 5. BAI Jing-Zhi et al(BES Collab.) .Phys.Rev.,1997,D56(7):3779— 3782 6. BAI Jing-Zhi et al (BES Collab .) .Phys.Rev .,1998,D57:28;RONG Gang (BES Collab .) .Direct Measurement of B(D+s →span style="border-top: 1px solid; padding-top: 0px;"K s0/span X)and B(D+ s →K s0 X) .Talk Given at Hadron' 99.Beijing ,1999; Nucl.Phys.,2000 ,A675:363c 7. RONG Gang et al.High Energy Phys.and Nucl.Phys.,1996,20(7) :577— 587(in Chinese)(荣刚等.高能物理与核物理 ,1996,20 (7) :577— 587)8. Haidt D et al.The European Physical Journal C ,1998,3:1—4 9. BAI Jing-Zhi et al (BES Collab.) .Contribution Paper to ICHEP'98.Canada.199810. Sov J.Nucl.Phys.,1985,41 :466
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BES Collaboration. Measurement of Production Cross Section of Ds+Ds in e+e Annihilation at the Center-of-Mass Energy of s=4.03GeV[J]. Chinese Physics C, 2001, 25(6): 465-475.
BES Collaboration. Measurement of Production Cross Section of Ds+Ds in e+e Annihilation at the Center-of-Mass Energy of s=4.03GeV[J]. Chinese Physics C, 2001, 25(6): 465-475. shu
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Received: 2000-05-10
Revised: 1900-01-01
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Measurement of Production Cross Section of Ds+Ds in e+e Annihilation at the Center-of-Mass Energy of s=4.03GeV

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

Abstract: Measurement of the production cross section of the D+s D- s in e+e- annihilation at the Center-of-Mass Energy of s=4.03 GeV is reported in the paper. The cross section for the D+s D- s production has been measured using a data sample of 22.3 pb-1 collected with BES detector at BEPC e+e- collider. The D+ s measons are reconstructed in the π+,K*0 K+ and K0K+ decay modes. A total number of 94±13 singly tagged D+ s events is obtained from the three modes. This yelds the cross section value σ prod D+s D- s=(451±63±118)pb for D+ s D- s production. Based on the numbers of singly tagged D+ s events for each of the three decay modes,the decay branching fractions for D+ s→K *0 K+ and K0K+ have been determined to be (3.02±0.94±0.91)% and (3.28±1.22±0.94)%,respectively.

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