论文标题
$γγ\ toτ^+τ^ - $ pb+ pb碰撞中的$γγ\ to $γγ\ to $γγ\ to $γγ\ to的异常电磁矩
Anomalous electromagnetic moments of $τ$ lepton in $γγ\to τ^+ τ^-$ reaction in Pb+Pb collisions at the LHC
论文作者
论文摘要
我们讨论了$γγ\至τ^+τ^ - $ $ $ $ $ $ $在LHC Energies的$d_τ$ $τ$ Lepton的超疗法PB+ PB碰撞中的coltistion。我们通过将基本横截面与重离子光子通量折叠，并考虑在Atlas和CMS探测器的基金体积中考虑两种$τ$ leptons的半左右衰变，从而得出相应的横截面。我们介绍了总和差分截面的预测，以及与$γγ\与E^+ E^ - （μ^+μ^ - $）过程的预测。这些比率可以在LHC上执行$A_τ$的精确度量时取消理论和实验性不确定性。与当前最佳实验限制相比，发现具有现有PB+PB数据集的$A_τ$的预期限制可以更好地提高两个因素，并且在高光度LHC时可以进一步改善两个因子。
We discuss the sensitivity of the $γγ\to τ^+ τ^-$ process in ultraperipheral Pb+Pb collisions on the anomalous magnetic ($a_τ$) and electric ($d_τ$) moments of $τ$ lepton at LHC energies. We derive the corresponding cross sections by folding the elementary cross section with the heavy-ion photon fluxes and considering semi-leptonic decays of both $τ$ leptons in the fiducial volume of ATLAS and CMS detectors. We present predictions for total and differential cross sections, and for the ratios to $γγ\to e^+ e^- (μ^+ μ^-$) process. These ratios allow to cancel theoretical and experimental uncertainties when performing precision measurement of $a_τ$ at the LHC. The expected limits on $a_τ$ with existing Pb+Pb dataset are found to be better by a factor of two comparing to current best experimental limits and can be further improved by another factor of two at High Luminosity LHC.
