Angular analysis of the B0 ? K*0e+e- decay in the low-q2 region
Angular analysis of the B0 ? K*0e+e- decay in the low-q2 region
复制标题
B0 的角度分析？
DOI：
10.1007/jhep04(2015)064
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发表时间：
2015
影响因子：
5.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
对B0→K*0 e+e−衰变的角度分析是使用2011年至2012年期间在质心能量为7和8TeV的pp碰撞中由LHCb实验收集的对应于3.0fB−1的积分光度的数据样本进行的。首次在0.002~1.120 GeV2/c4的双电子质量平方(Q2)区间内测量了几个观测量。测得与K*0极化和轻子前后不对称性有关的角观测量F L和A Re T=0。16±0。06±0。0 3，A Re T=0.10±0.18±0.0 5，其中第一个不确定度是统计的，第二个不确定度是系统的。在Q2范围内对光子偏振敏感的角观量A(2)T和Aim T分别为A(2)T=−0.2 3±0.2 3±0.0 5和A im T=0.14±0.2 2±0.0 5。结果与标准模型的预测结果一致。
An angular analysis of the B 0→ K* 0 e+ e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb− 1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q 2) interval between 0.002 and 1.120 GeV 2/c 4. The angular observables F L and A Re T which are related to the K* 0 polarisation and to the lepton forward-backward asymmetry, are measured to be F L= 0. 16±0. 06±0. 03 and A Re T= 0.10±0.18±0.05, where the first uncertainty is statistical and the second systematic. The angular observables A (2) T and A Im T which are sensitive to the photon polarisation in this q 2 range, are found to be A (2) T=− 0.23±0.23±0.05 and A Im T= 0.14±0.22±0.05. The results are consistent with Standard Model predictions.