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Observation ofD0→K1(1270)−e+νe
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-09-24 , DOI: 10.1103/physrevlett.127.131801
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28 , Q Zhao 1 , S J Zhao 30 , Y B Zhao 1, 10 , Y X Zhao 26 , Z G Zhao 10, 11 , A Zhemchugov 14 , B Zheng 33 , J P Zheng 1, 10 , Y Zheng 17 , Y H Zheng 22 , B Zhong 41 , C Zhong 33 , L P Zhou 1, 22 , Q Zhou 1, 22 , X Zhou 21 , X K Zhou 22 , X R Zhou 10, 11 , X Y Zhou 9 , A N Zhu 1, 22 , J Zhu 28 , K Zhu 1 , K J Zhu 1, 10, 22 , S H Zhu 77 , T J Zhu 76 , W J Zhu 43 , W J Zhu 28 , Y C Zhu 10, 11 , Z A Zhu 1, 22 , B S Zou 1 , J H Zou 1 ,
Affiliation  

Using 2.93fb1 of e+e collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0K1(1270)e+νe semileptonic decay is presented. The statistical significance of the decay D0K1(1270)e+νe is greater than 10σ. The branching fraction of D0K1(1270)e+νe is measured to be (1.09±0.130.16+0.09±0.12)×103. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)Kπ+π. The fraction of longitudinal polarization in D0K1(1270)e+νe is determined for the first time to be 0.50±0.19stat±0.08syst.

中文翻译:

观察D0→K1(1270)−e+νe

使用 2.93脸书-1电子+电子- 用 BESIII 探测器在 3.773 GeV 质心能量下获取的碰撞数据,观察到 D01(1270)-电子+ν电子介绍了半轻衰变。衰减的统计显着性D01(1270)-电子+ν电子 大于 10σ. 的支化分数D01(1270)-电子+ν电子 被测量为 (1.09±0.13-0.16+0.09±0.12)×10-3. 这里,第一个不确定性是统计的,第二个是系统的,第三个来自假设的分支分数1(1270)--π+π-. 纵向极化的分数D01(1270)-电子+ν电子 首次确定为 0.50±0.19状态±0.08系统.
更新日期:2021-09-24
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