论文标题
$ e^{+} e^{ - } $的光生效
Photoproduction of $e^{+}e^{-}$ in peripheral isobar collisions
论文作者
论文摘要
我们研究了$ _ {44}^{96} {96} \ textrm {ru}+_ {44}^{96} \ textrm {ru} $ and and and and and and and and and and and和$ _ {40}^{96} \ textrm {zr}+_ {40}^{96} \ textrm {zr {zr} $在200 GEV。通过计算密度功能理论给出的电荷和质量密度分布，我们计算了40-80 \％中心的二元电子的横向动量，不变质量和方位角的光谱。这些光谱在Ru+Ru碰撞与Zr+Zr碰撞中的比率小于$（44/40）^{4} $（RU和ZR的$ Z^{4} $的比率在低横向动量下的比率。该偏差来自RU和ZR中不同的质量和电荷密度分布。因此，在异荷尔碰撞中，di-lepton的光生源可能会提供一种探测核结构的新方法。
We investigate the photoproduction of di-electrons in peripheral collisions of $_{44}^{96}\textrm{Ru}+_{44}^{96}\textrm{Ru}$ and $_{40}^{96}\textrm{Zr}+_{40}^{96}\textrm{Zr}$ at 200 GeV. With the charge and mass density distributions given by the calculation of the density functional theory, we calculate the spectra of transverse momentum, invariant mass and azimuthal angle for di-electrons at 40-80\% centrality. The ratios of these spectra in Ru+Ru collisions over to Zr+Zr collisions are shown to be smaller than $(44/40)^{4}$ (the ratio of $Z^{4}$ for Ru and Zr) at low transverse momentum. The deviation arises from the different mass and charge density distributions in Ru and Zr. So the photoproduction of di-leptons in isobar collisions may provide a new way to probe the nuclear structure.
