Modification of Z0 leptonic invariant mass in ultrarelativistic heavy ion collisions as a measure of the electromagnetic field
Modification of Z0 leptonic invariant mass in ultrarelativistic heavy ion collisions as a measure of the electromagnetic field
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DOI：
10.1016/j.physletb.2022.136962
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发表时间：
2021-11
影响因子：
4.4
通讯作者：
Yifeng Sun;V. Greco;Xin-Nian Wang
中科院分区：
文献类型：
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作者：
Yifeng Sun;V. Greco;Xin-Nian Wang
在非中心超相对论性重离子碰撞中，预计会产生一个非常强的磁场，eb0≈10 18高斯，并设想它会对热QCD物质产生几种影响，包括局部宇称和局部电荷共轭以及宇称对称违反的可能性。这种电磁场的直接特征和其强度和寿命的首次定量测量仍然缺失。我们指出，在相对论性重离子碰撞中，由于强初始电磁场的存在，由衰变轻子对重建的z0玻色子的轻子不变质量平均值和相对宽度都被修正了。我们提出了一种测量z0的轻子不变质量的方法，作为对by强度的新探测。这两种位移都可以高达几百MeV，并且发现它们依赖于by在时间持续时间内的二次积分（近似）。因此，它提供了一种新的、清晰的电磁场探测方法，可以通过实验进行验证。
An extraordinary strong magnetic field, e B 0≈ 10 18 Gauss, is expected to be generated in non-central ultrarelativistic heavy ion collisions and it is envisaged to induce several effects on hot QCD matter including the possibility of local parity and local charge conjugation and parity symmetry violations. A direct signature of such em fields and a first quantitative measurement of its strength and lifetime are still missing. We point out that both the mean value of leptonic invariant mass of Z 0 boson, reconstructed by its decaying lepton pairs, and the relative width are modified in relativistic heavy ion collisions due to the presence of strong initial em fields. We propose a measurement of the leptonic invariant mass of Z 0 as a novel probe of the strength of the B y. Both shifts could be up to about few hundred MeV and are found to depend on the integral of B y over the time duration quadratically (approximate). Hence it provides a novel and clear probe of electromagnetic fields, which can be tested experimentally.