arXiv 2609.11057hep-ex

在SND探测器上搜索过程$e^+e^-\to f_1(1285)$

Search for the process $e^+e^-\to f_1(1285)$ at the SND detector

SND Collaboration, M. N. Achasov, A. E. Alizzi, A. Yu. Barnyakov, E. V. Bedarev, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Bo… 展开作者

SND Collaboration, M. N. Achasov, A. E. Alizzi, A. Yu. Barnyakov, E. V. Bedarev, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, D. E. Chistyakov, T. V. Dimova, V. P. Druzhinin, R. A. Efremov, L. V. Kardapoltsev, A. S. Kasaev, A. A. Kattsin, V. R. Khamidullin, A. G. Kharlamov, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, A. P. Kryukov, A. R. Mamedov, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, A. A. Oorzhak, I. V. Ovtin, E. V. Pakhtusova, I. A. Polomoshnov, K. V. Pugachev, S, A. Rastigeev, Yu. A. Rogovsky, V. A. Romanov, S. I. Serednyakov, D. A. Shtol, Z. K. Silagadze, K. D. Sungurov, I. K. Surin, Yu. V. Usov, V. N. Zhabin, V. V. Zhulanov

首次发表 2026-09-16

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中文总结 AI 辅助

在SND探测器上利用VEPP-2000对撞机数据搜索$e^+e^-\to f_1(1285)$过程，测得截面和分支比，观测显著性为$2.5\sigma$，并给出90%置信水平的上限。

中文摘要 AI 辅助

在VEPP-2000 $e^+e^-$对撞机上使用SND探测器进行的实验中，搜索了$e^+e^-$碰撞中$C$宇称为偶的$f_1(1285)$共振态的直接产生。该分析基于积分亮度约为200 pb$^{-1}$的数据，这些数据在质心能量范围1.14--1.46 GeV内积累，其中约72 pb$^{-1}$是在$f_1(1285)$共振峰附近记录的。测量了共振峰处的$f_1(1285)$产生截面$\sigma(e^+e^-\to f_1)=(31\pm 13\pm 2)$ pb和分支比$B(f_1(1285)\to e^+e^-)=(3.5\pm 1.4\pm 0.3)\times 10^{-9}$。$e^+e^-\to f_1(1285)$过程的观测显著性为$2.5\sigma$。由于显著性较低，我们还给出了90%置信水平的上限：$\sigma(e^+e^-\to f_1)<48\mbox{ pb}$和$B(f_1(1285)\to e^+e^-)<5.4\times 10^{-9}$。

英文摘要

In the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider, a search is performed for the direct production of the $C$-even $f_1(1285)$ resonance in $e^+e^-$ collisions. The analysis is based on data with an integrated luminosity of about 200 pb$^{-1}$, accumulated in the center-of-mass energy range of 1.14--1.46 GeV, of which about 72 pb$^{-1}$ were recorded near the maximum of the $f_1(1285)$ resonance. The $f_1(1285)$ production cross section at the resonance maximum $σ(e^+e^-\to f_1)=(31\pm 13\pm 2)$ pb and the branching fraction $B(f_1(1285)\to e^+e^-)=(3.5\pm 1.4\pm 0.3)\times 10^{-9}$ have been measured. The significance of the observation of the $e^+e^-\to f_1(1285)$ process is $2.5σ$. Since the significance is low, we also present the upper limits at the 90% confidence level: $σ(e^+e^-\to f_1)<48\mbox{ pb}$ and $B(f_1(1285)\to e^+e^-)<5.4\times 10^{-9}$.

发表机构

Budker Institute of Nuclear Physics, SB RAS（布德克核物理研究所）
Novosibirsk State University（新西伯利亚国立大学）

机构由 AI 辅助整理，请以论文原文为准。

补充信息

备注: 15 pages, 5 figures