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首页> 外文期刊>Physical Review C >Coherent diffractive photoproduction of ρ~0 mesons on gold nuclei at 200 GeVucleon-pair at the Relativistic Heavy Ion Collider
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Coherent diffractive photoproduction of ρ~0 mesons on gold nuclei at 200 GeVucleon-pair at the Relativistic Heavy Ion Collider

机译：在相对论重离子撞器中200 GEV / Nucleon-对在200 GEV / Nucleon-对中的ρ〜0 mesons的相干衍射照射

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摘要

The STAR Collaboration reports on the photoproduction of π~+π~− pairs in gold-gold collisions at a center-ofmass energy of 200 GeVucleon-pair. These pion pairs are produced when a nearly real photon emitted by one ion scatters from the other ion. We fit the π~+π~− invariant-mass spectrum with a combination of ρ~0 and ω resonances and a direct π~+π~− continuum. This is the first observation of the ω in ultraperipheral collisions, and the first measurement of ρ-ω interference at energieswhere photoproduction is dominated by Pomeron exchange. The ω amplitude is consistent with the measured γp → ωp cross section, a classical Glauber calculation, and the ω → π~+π~− branching ratio. The ω phase angle is similar to that observed at much lower energies, showing that the ρ-ω phase difference does not depend significantly on photon energy. The ρ~0 differential cross section dσ/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.
机译：恒星协作报告了200 GEV / Nucleor-对的磁性能量中金碰撞中π〜+π〜 - 对的光洗脱。当由一个离子从另一离子发射的几乎真实的光子时产生这些孔对。我们适用于具有ρ〜0和ω共振的组合和直接π〜+π〜 - 连续体的π〜+π〜 - 不变质谱。这是第一次观察ω在超周碰撞中，并且Energieswhere Photomoction在PoMeron交换中的第一次测量ρ-ω干扰。 Ω幅度与测量的γp→ωp横截面，经典甘油计算和ω→π〜+π〜 - 分支比一致。 ω相位角与在更低的能量下观察到的ω相位角，表明ρ-ω相位差不会显着取决于光子能量。 ρ〜0差分横截面Dσ/ DT表现出透明的衍射图案，与来自金核的散射兼容，有两个最小可见。衍射最小值的位置更好地与量子Glauber计算的预测不包括核阴影的预测，而不是用来包括阴影的计算。

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  • 来源
    《Physical Review C》 |2017年第2017期|054904.1-054904.12|共12页
  • 作者

    L. Adamczyk; J. K. Adkins; G. Agakishiev; M. M. Aggarwal; Z. Ahammed; et al;

  • 作者单位

    AGH University of Science and Technology FPACS Cracow 30-059 Poland;

    University of Kentucky Lexington Kentucky 40506-0055;

    Joint Institute for Nuclear Research Dubna 141 980 Russia;

    Panjab University Chandigarh 160014 India;

    Variable Energy Cyclotron Centre Kolkata 700064 India;

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