论文标题
从$ z^0 $ decay和Charmed Mesons探测超磁碰撞中的电磁场
Probing the electromagnetic fields in ultrarelativistic collisions with leptons from $Z^0$ decay and charmed mesons
论文作者
论文摘要
预计超级重型离子碰撞将产生一个巨大的电磁场，$ eb \ \ \ 10^{18} \，Gauss $，可引起有向流的分裂，$ v_1 = \ weft \ weft \ langle p_x/p_x/p_t \ rangle \ right \ rangle $ rangle \ rangle $ rangle \ rangle $ rangge themed颗粒和反式抗粉红色。对于中性的粒子/抗粒子对（$ d^0，\ edlline {d}^0 $），这种对魅力的梅森的分裂也表现出来，因此也是对夸克 - 杜伦等离子体相形成的独特探测。在这里，我们首次表明电磁场可能会生成$ v_1（d^0）-v_1（\ overline {d}^0）$，就像最近在LHC上观察到的早期期望一样的巨额。 在这个新的研究主题中，我们指出了一种新颖的测量：$ z^0 $衰减的lept子及其与$ d $和$ b $ ersons的相关性。 $ l^{+} - l^{ - } $，$ d^0- \ overline {d}^0 $和$ b^0- \ edline {b}^0 $的相关性将提供对拆分的电气分裂和繁重的股票阶段的电气形式的强烈探测。 $ v_1（{l^{\ pm}}）$的情况出现了功能，这是由于$ p_t $ spectrum的特殊形式在研究重离子碰撞时从未欣赏过。我们特别预测以$ p_t = 45 $ gev $/c $的$ΔV_1（p_t）$突然更改，可以追溯到$ p_t $粒子分布的斜率$ΔV_1$的通用关系和lorentz Force的集成效应。
Ultrarelativistic heavy ion collisions are expected to generate a huge electromagnetic field, $eB \approx 10^{18}\, Gauss$, that induces a splitting of the directed flow, $v_1=\left\langle p_x/p_T \right\rangle $, of charged particles and anti-particles. Such a splitting for charmed meson manifests even for neutral particle/anti-particles pairs ($D^0, \overline{D}^0$), hence being also a unique probe of the formation of the quark-gluon plasma phase. For the first time here we show that electromagnetic field may generate a $v_1(D^0) - v_1( \overline{D}^0)$ as huge as the one recently observed at LHC against early expectations. Within this new research topic we point out a novel measurement: $v_1$ of leptons from $Z^0$ decay and its correlation to that of $D$ and $B$ mesons. The correlation for $Δv_1$ of $l^{+} - l^{-}$, $D^0-\overline{D}^0$ and $B^0-\overline{B}^0$ would provide a strong probe of the electromagnetic origin of the splitting and hence of the formation of a quark-gluon plasma phase with heavy quarks as degrees of freedom. The case of the $v_1({l^{\pm}})$ presents features due to the peculiar form of the $p_T$ spectrum never appreciated before in the study of heavy ion collisions. We specifically predict a sudden change of the $Δv_1(p_T)$ of leptons at $p_T=45$ GeV$/c$, that can be traced back to a universal relation of $Δv_1$ with the slope of the $p_T$ particle distribution and the integrated effect of the Lorentz force.
