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arXiv 0712.3841hep-ex
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用KLOE探测器测量半轻子K+/-衰变的绝对分支比

Measurement of the absolute branching ratios for semileptonic K+/- decays with the KLOE detector

KLOE Collaboration

摘要:

利用在Dafne e ~+e ~-对撞机上收集的6亿多个φ ~->K ~+K ~-衰变样品,用KLOE探测器测量了K ~+/-> p ~ 0 e ~ nu(γ)(K ~+/-> p ~ 0 μ ~ nu(γ)(K ~+/-> p ~ 0 μ ~ nu(γ))(K ~+/-> p ~ 0 μ ~ nu(γ))(K ~+/μ ~ 3)的荷电K ~-子半轻子衰变的绝对分支比。结果为BR(Ke 3)= 0.04965 +/- 0.00038_{stat} +/- 0.00037_{syst}和BR(Kmu 3)= 0.03233 +/- 0.00029_{stat} +/- 0.00026_{syst},包括辐射。考虑到相关性,我们得出比率Kmu 3/Ke 3 = 0.6511+/-0.0064。使用在同一实验中测量的半轻子形状因子,我们得到V_{us} f_{+}(0)= 0.2141 +/- 0.0013。

英文摘要:

Using a sample of over 600 million phi->K+K- decays collected at the Dafne e+e- collider, we have measured with the KLOE detector the absolute branching ratios for the charged kaon semileptonic decays, K+/- -> p0 e nu (gamma) (Ke3) and K+/- -> p0 mu nu (gamma) (Kmu3). The results, BR(Ke3) = 0.04965 +/- 0.00038_{stat} +/- 0.00037_{syst} and BR(Kmu3) = 0.03233 +/- 0.00029_{stat} +/- 0.00026_{syst}, are inclusive of radiation. Accounting for correlations, we derive the ratio Kmu3/Ke3 = 0.6511+/-0.0064. Using the semileptonic form factors measured in the same experiment, we obtain V_{us}f_{+}(0) = 0.2141 +/- 0.0013.

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