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arXiv 0711.3252hep-ex
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B -> D** lnu的全重构标记研究

Study of B -> D** l nu with full reconstruction tagging

Dmitri Liventsev

摘要:

本文报道了半轻子B衰变到P波D介子的研究。首次观察到D ~*_2介子的半轻子衰变,测得其产物分支比为Br(B ~+ -> anti-D ~*0_2 l+nu)× Br(anti-D ~*0_2 -> D-pi+)= 0.22 ± 0.03(stat.)+- 0.04(系统)%。该结果是使用来自数据样本的完全重建的B标签获得的,该数据样本包含在KEKB非对称能量e+ e-对撞机上用Belle探测器在Uppermont(4S)共振处收集的6.57亿个BB-条对。

英文摘要:

We report a study of semileptonic B decays to P-wave D** mesons. Semileptonic decay to D*_2 meson is observed for the first time and its product branching ratio is measured to be Br(B+ -> anti-D*0_2 l+nu) x Br(anti-D*0_2 -> D- pi+) = 0.22 +- 0.03(stat.) +- 0.04(syst.)%. The result is obtained using the fully reconstructed B tags from a data sample that contains 657 millions BB-bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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