强磁场对夸克偶素虚势和热宽度的影响

The effect of magnetic field on imaginary potential and thermal width of quarkonium

采用规范/引力对偶技术来研究磁化背景下的夸克偶素虚势以及热宽度,分析夸克-反夸克对的取向与磁场任意夹角情况下的热力学世界面热涨落和虚势。计算结果表明,磁场对于中等和较小质量的夸克形成的束缚态的影响比较明显,而对于很大质量的共振态,磁场对其热宽度的影响比较小,而且随着磁场的增大,共振态束缚的越弱。而对于中等或者较小质量的共振态,随着磁场的增大,共振态越不稳定。偶极子的取向只对中等和稍微偏大质量的束缚态有较大的影响,并且当偶极子的取向平行于磁场的取向时,共振态有最强的束缚,等离子体对夸克偶素有更小的屏蔽。

The gauge/gravity duality technique had been used to study the imaginary potential and thermal width of quarkonium by considering that the axis of quark-antiquark pairs which has an arbitrary angle in a magnetized gravitational background.A method of thermal fluctuation of the stringy worldsheet was used to calculate the imaginary potential in this paper.The results showed that the magnetic field had a significant effect on the bound states formed by quarks of medium and small mass,while for resonance states of large mass,the magnetic field had a relatively small effect on the thermal width,and the increasing magnetic field reduced the bound.For the resonance states of medium or small mass,the resonance states were more unstable with the increase of magnetic field.The dipole orientation only had a great influence on the bound states of medium and slightly larger mass.When the dipole orientation is parallel to the magnetic field orientation,the resonance states had the strongest binding,and there were less screened between plasma and heavy quark-antiquark pairs.