论文标题
HQ碰撞能量损失在磁化培养基中
HQ Collisional energy loss in a magnetized medium
论文作者
论文摘要
我们研究磁场对在磁化热蛋白培养基中移动的重夸克（HQ）碰撞能量损失的影响。在强场近似中对此进行了研究，其中最低的Landau水平（LLL）变得相关。我们以$ g \ sqrt {eb} \ ll t \ ll \ sqrt {eb} $的限制工作，与重离子碰撞有关。磁场的效果通过重新介绍的GLUON传播器纳入，其中主要贡献源自夸克环。我们还采用近似$ \ sqrt {eb} \ ll m $，m为HQ质量，因此HQ不能量化Landau。事实证明，只有两种类型的散射导致了总部的能量损失。带有光夸克/反夸克和T通道康普顿散射的总部库仑散射。据观察，对于给定的磁场，对碰撞能量损失的主要贡献来自康普顿散射过程，即$ qg \ rightarrow qg $。另一方面，在这两个过程中，库仑散射，即$ qq \ rightarrow qq $对磁场更敏感。净碰撞能量损失被认为随着磁场的增加而增加。对于磁场的合理强度，对碰撞能量损失的场贡献与没有磁场的情况相同，这对于重离子碰撞实验中的喷射淬灭现象很重要。
We study the effect of the magnetic field on the collisional energy loss of heavy quark (HQ) moving in a magnetized thermal partonic medium. This is investigated in the strong field approximation where the lowest Landau level (LLL) becomes relevant. We work in the limit $g\sqrt{eB}\ll T\ll \sqrt{eB}$ which is relevant for heavy ion collisions. Effects of the magnetic field are incorporated through the resummed gluon propagator in which the dominant contribution arises from the quark loop. We also take the approximation $\sqrt{eB}\ll M$, M being the HQ mass, so that the HQ is not Landau quantized. It turns out that there are only two types of scatterings that contribute to the energy loss of HQ; the Coulomb scattering of HQ with light quarks/anti-quarks and the t-channel Compton scattering. It is observed that for a given magnetic field, the dominant contribution to the collisional energy loss arises from Compton scattering process i.e., $Qg\rightarrow Qg$. On the other hand, of the two processes, the Coulomb scattering i.e., $Qq\rightarrow Qq$ is more sensitive to the magnetic field. The net collisional energy loss is seen to increase with increase in the magnetic field. For a reasonable strength of the magnetic field, the field dependent contribution to the collisional energy loss is of the same order as to the case without magnetic field which can be important for the jet quenching phenomena in the heavy ion collision experiments.
