用CMD-3探测器测量从阈值到1.2 GeV的$e^+e^-\pi^+\pi^-$截面
摘要：用CMD-3探测器在VEPP-2000电子正电子对撞机的质心能量范围从0.32到1.2 GeV测量了进程$e^+e^-\pi^+\pi^-$的截面。该测量基于在1 GeV以下进行的三个数据采集季节所收集的完整数据集，对应的积分亮度约为62 pb$^{-1}$。在主要的$ρ$-共振区域，达到了0.7%的系统误差。在$ϕ$-共振能量附近，首次以高能量分辨率测量了$π^+π^-$产生截面。还测量了$π^+π^-$产生的前后向电荷不对称性。它显示了与基于常规sQED框架的理论预测明显偏离的强烈偏差，并与GVDM和基于色散的预测达成了良好的一致。讨论了所呈现结果对评估μ子的反常磁矩中强子贡献的影响。
作者：CMD-3 Collaboration: F. V. Ignatov (1 and 2), R. R. Akhmetshin (1 and 2), A. N. Amirkhanov (1 and 2), A. V. Anisenkov (1 and 2), V. M. Aulchenko (1 and 2), N. S. Bashtovoy (1), D. E. Berkaev (1 and 2), A. E. Bondar (1 and 2), A. V. Bragin (1), S. I. Eidelman (1 and 2), D. A. Epifanov (1 and 2), L. B. Epshteyn (1 and 2 and 3), A. L. Erofeev (1 and 2), G. V. Fedotovich (1 and 2), A. O. Gorkovenko (1 and 3), F. J. Grancagnolo (5), A. A. Grebenuk (1 and 2), S. S. Gribanov (1 and 2), D. N. Grigoriev (1 and 2 and 3), V. L. Ivanov (1 and 2), S. V. Karpov (1), A. S. Kasaev (1), V. F. Kazanin (1 and 2), B. I. Khazin (1), A. N. Kirpotin (1), I. A. Koop (1 and 2), A. A. Korobov (1 and 2), A. N. Kozyrev (1 and 3), E. A. Kozyrev (1 and 2), P. P. Krokovny (1 and 2), A. E. Kuzmenko (1), A. S. Kuzmin (1 and 2), I. B. Logashenko (1 and 2), P. A. Lukin (1 and 2), A. P. Lysenko (1), K. Yu. Mikhailov (1 and 2), I. V. Obraztsov (1 and 2), V. S. Okhapkin (1), A. V. Otboev (1), E. A. Perevedentsev (1 and 2), Yu. N. Pestov (1), A. S. Popov (1 and 2), G. P. Razuvaev (1 and 2), Yu. A. Rogovsky (1 and 2), A. A. Ruban (1), N. M. Ryskulov (1), A. E. Ryzhenenkov (1 and 2), A. V. Semenov (1 and 2), A. I. Senchenko (1), P. Yu. Shatunov (1), Yu. M. Shatunov (1), V. E. Shebalin (1 and 2), D. N. Shemyakin (1 and 2), B. A. Shwartz (1 and 2), D. B. Shwartz (1 and 2), A. L. Sibidanov (1 and 4), E. P. Solodov (1 and 2), A. A. Talyshev (1 and 2), M. V. Timoshenko (1), V. M. Titov (1), S. S. Tolmachev (1 and 2), A. I. Vorobiov (1), I. M. Zemlyansky (1), D. S. Zhadan (1), Yu. M. Zharinov (1), A. S. Zubakin (1), Yu. V. Yudin (1 and 2) ((1) Budker Institute of Nuclear Physics, Novosibirsk, (2) Novosibirsk State University, (3) Novosibirsk State Technical University, (4) University of Victoria, (5) Instituto Nazionale di Fisica Nucleare, Sezione di Lecce)
论文ID：2302.08834
分类：High Energy Physics - Experiment
分类简称：hep-ex
提交时间：2023-07-31