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VEPP-2000 e^+e^-对撞机上用CMD-3探测器测量e^+e^-→ηπ^+π^-和e^+e^-→ωπ^+π^-的截面（英文）

Measurement of e^+e^-→ηπ^+π^- and e^+e^-→ωπ^+π^- cross sections with the CMD-3 detector at the VEPP-2000 collider
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摘要 在VEPP^-2000e^+e^-对撞机上,CMD^-3探测器研究了e^+e^-→ηπ^+π^-→γγπ^+π^-,e^+e^-→ηπ^+π^-→π0π^+π^-π^+π^-以及e^+e^-→ωπ^+π^-→π0π^+π^-π^+π^-等过程.分析使用的是2011和2012年在1.2^-2.0Ge V能区收集的相应积分亮度为3×104nb^-1的数据.用η→γγ道测量了e^+e^-→ηπ^+π^-的波恩截面,结果与相关的实验结论相吻合;还用末态η→π^+π^-π0和ω→π^+π^-π0分别得到了e^+e^-→ηπ^+π^-和e^+e^-→ωπ^+π^-波恩截面的初步结果;e^+e^-→ηπ^+π^-波恩截面的数值还被用于确定τ^-→ηπ^-π0ντ的衰变分支比. The processes e^+e^-→ηπ^+π^-→γγπ^+π^-,e^+e^-→ηπ^+π^-→π0π^+π^-π^+π^-and e^+e^-→ωπ^+π^-→π0π^+π^-π^+π^-have been studied with the CMD-3 detector at the VEPP-2000 collider. For analysis data collected in the center-of-mass energy range from 1. 2 to 2. 0 Ge V is used. Studied data corresponding to an integrated luminosity of 3 × 104nb- 1were recorded in 2011 and 2012. The Born cross section of e^+e^-→ηπ^+π^-has been measured in the η→γγ channel and is in good agreement with results obtained in other experiments. There are also preliminary results for the e^+e^-→ηπ^+π^-and e^+e^-→ωπ^+π^-Born cross sections in the η→π^+π^-π0and ω→π^+π^-π0final states,respectively. The e^+e^-→ηπ^+π^-Born cross section data have been used to determine the τ-→ηπ-π0ντdecay branching fraction.
作者 POPOV A.S. AKHMETSHIN R.R. AMIRKHANOV A.N. ANISENKOV A.V. AULCHENKO V.M. BANZAROV V.S. BASHTOVOY N.S. BERKAEV D.E. BONDAR A.E. BRAGIN A.V. EIDELMAN D.E. EPIFANOV D.A. EPSHTEYN L.B. EROFEEV A.L. FEDOTOVICH G.V. GAYAZOV S.E. GREBENUK A.A. GRIBANOV S.S. GRIGORIEV D.N. GROMOV E.M. IGNATIN F.V. IVANOV V.L. KARPOV S.V. KASAEV A.S. KORPOTIN A.N. KOOP I.A. KOVALENKO O.A. KAZANIN V.F. KOZYREV A.N. KOZYREV E.A. KROKOVNY P.P. KUZMENKO A.E. KUZMIN A.S. LOGASHENKO I.B. LIKIN P.A. MIKHAILOV K.YU. OKHAPKIN V.S. OTBOEV A.V. PESTOVY U.N. PIVOVAROV S.G. RAZUVAEV G.P. ROMANOV A.L. RUBAN A.A. RYSKULOV N.M. RYZHENENKOV A.E. SHEBALIN V.E. SHEMYAKIN D.N. SHWARTZ B.A. SHWARTZ D.B. SIBIDANLOV A.L. SHATUNOV P.YU. SHATUNOVY U.M. SOLODOV E.P. TITOV V.M. TALYSHEV A.A. VOROBIOV A.I.. YUDINY U.V. ZHARINOVY U.M.
机构地区 俄罗斯布德克尔核物理研究所 国立新西伯利亚大学 东京大学物理系 国立新西伯利亚理工大学 悉尼大学物理学院高能物理系
出处 《中国科学技术大学学报》 CAS CSCD 北大核心 2016年第6期514-522,共9页 JUSTC
基金 Supported by Russian Foundation for Basic Research(15-02-05674)
关键词 截面 ηπ+π- ωπ+π- 强子 τ cross section ηπ+π- ωπ+π- hadrons branching τ
分类号 O572.214 [理学—粒子物理与原子核物理]
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共引文献21

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中国科学技术大学学报
2016年 第6期

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