University of Illinois at Urbana-Champaign, 61801, USA.
Phys Rev Lett. 2011 Aug 12;107(7):072004. doi: 10.1103/PhysRevLett.107.072004.
The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e(+)e(-) annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered π(+)π(-) pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672 fb(-1) data sample that contains 711 × 10(6) π(+)π(-) pairs and was collected at and near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider.
干涉碎裂函数将带有横向自旋投影的夸克碎裂转化为两个末态强子的方位不对称性。在正负电子对湮没中，两个干涉碎裂函数的乘积被测量到。我们报道了带电荷序的π(+)π(-)对的非零不对称性，这表明在这个通道中存在显著的干涉碎裂函数。结果是从一个包含 711×10(6)π(+)π(-)对的 672 fb(-1)数据样本中得到的，该样本是在 KEKB 不对称能量正负电子对撞机上的 Belle 探测器在 Υ(4S)共振附近收集的。
