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INITIAL STATE RADIATION (ISR) STUDY AT BABAR AND THE APPLICATION TO THE R MEASUREMENT AND HADRON SPECTROSCOPY

机译:Babar的初始状态辐射(ISR)研究和R测量和强子光谱的应用

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摘要

A study of several multi-body hadronic final states accompanied by hard photon has been performed using data from e + c – collisions at the c.m. energy near Y(4S) collected with the BABAR detector 1 at the PEP-II collider. The invariant mass of the hadronic final state determines the virtual photon energy, so that data can be compared with direct e + e– cross sections. A new preliminary results for the e+ e – K±K- 7+ 7T – and e + e – K+ K-7°7r° cross sections are presented based on 232 fb -1 . In the 0(1020)fo (980) intermediate state a new 1 -- resonancelike structure has been observed with mass and width m = 2.175 ± 0.010 ± 0.015 GeV/c2 and r 58 ± 16 ± 20 MeV. We observe no Y(4260) signal and set a limit of By < 0.4 eV (90% confidence level) that excludes some models.
机译:对伴随硬膜伴有硬膜的多个多体重整最终状态的研究已经使用来自C.M.M的E + C碰撞的数据进行。在PEP-II撞机中与禁野探测器1收集的y(4s)附近的能量。重整最终状态的不变质量决定了虚拟光子能量,从而可以将数据与直接E +电子横截面进行比较。基于232 FB -1,提出了E + E-K±K-7t - 和E + E-k + K-7°7R°横截面的新初步结果。在0(1020)FO(980)中间状态下,据观察了全部和宽度M = 2.175±0.010±0.015 GEV / C2和R 58±16±20 MeV。我们观察NO(4260)信号并设定不包括某些型号的<0.4eV(90%置信水平)的限制。

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