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arXiv 1002.0279hep-phhep-ex
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用辐射返回法研究窄共振

Narrow resonances studies with the radiative return method

Henryk Czyz, Agnieszka Grzelinska, Johann H. Kuhn

摘要:

利用辐射返回法,在高亮度正负电子对撞机上进行的实验可以探索类时区域内的K介子和π介子形状因子,直到相当高的能量。这为研究在窄共振J/psi和psi(2S)附近的K介子和π介子对的产生以及探索电磁振幅和强子振幅之间的干涉提供了可能。带电和中性的K介子以及π形状因子的参数化推导,从而导致一个改进的描述的介子对的大不变质量的区域中的数据。这些形状因子与带电和中性K介子与J/psi和psi(2S)的强子耦合相结合,并被实施到蒙特卡罗生成器PHOKHARA中,PHOKHARA现在首次能够模拟窄共振的产生及其衰变为K介子、π介子和μ介子对。

英文摘要:

Using the radiative return method, experiments at high luminosity electron-positron colliders allow to explore the kaon and the pion form factors in the time-like region up to fairly high energies. This opens the possibility to study kaon and pion pair production at and around the narrow resonances J/psi and psi(2S) and explore the interference between electromagnetic and hadronic amplitudes. Parameterizations of charged and neutral kaon as well as pion form factors are derived, which lead to an improved description of the data in the region of large invariant masses of the meson pair. These form factors are combined with the hadronic couplings of charged and neutral kaons to J/psi and psi(2S) and implemented into the Monte Carlo generator PHOKHARA, which is now, for the first time, able to simulate the production of narrow resonances and their decay into kaon, pion and muon pairs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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