$\pi^0$辐射衰变宽度的新测量
核实验
2011-05-09 v1
摘要
为了提取衰变宽度，对两种核素C和Pb在入射光子能量为4.9 - 5.5 GeV时前向角光生反应的微分截面进行了高精度测量。该实验在杰斐逊实验室进行，使用了B厅光子标记器和高分辨率多通道量热仪。通过使用最近更新的该过程理论模型拟合测量截面，提取了衰变宽度。得到的衰变宽度值为。总不确定度为2.8%，该结果比当前粒子数据组（PDG）对这一基本量的平均值精确2.5倍，并且与当前的理论预测一致。
引用
@article{arxiv.1009.1681,
title = {A New Measurement of the $\pi^0$ Radiative Decay Width},
author = {I. Larin and D. McNulty and E. Clinton and P. Ambrozewicz and D. Lawrence and I. Nakagawa and Y. Prok and A. Teymurazyan and A. Ahmidouch and A. Asratyan and K. Baker and L. Benton and A. M. Bernstein and V. Burkert and P. Cole and P. Collins and D. Dale and S. Danagoulian and G. Davidenko and R. Demirchyan and A. Deur and A. Dolgolenko and G. Dzyubenko and R. Ent and A. Evdokimov and J. Feng and M. Gabrielyan and L. Gan and A. Gasparian and S. Gevorkyan and A. Glamazdin and V. Goryachev and V. Gyurjyan and K. Hardy and J. He and M. Ito and L. Jiang and D. Kashy and M. Khandaker and P. Kingsberry and A. Kolarkar and M. Konchatnyi and A. Korchin and W. Korsch and S. Kowalski and M. Kubantsev and V. Kubarovsky and X. Li and P. Martel and V. Matveev and B. Mecking and B. Milbrath and R. Minehart and R. Miskimen and V. Mochalov and S. Mtingwa and S. Overby and E. Pasyuk and M. Payen and R. Pedroni and B. Ritchie and T. E. Rodrigues and C. Salgado and A. Shahinyan and A. Sitnikov and D. Sober and S. Stepanyan and W. Stephens and J. Underwood and A. Vasiliev and V. Vishnyakov and M. Wood and S. Zhou},
journal= {arXiv preprint arXiv:1009.1681},
year = {2011}
}
备注
4 pages, 5 figures