论文标题
通过$ e^+e^ - $和强子乘员观察True Tauonium
Observing true tauonium via two-photon fusion at $e^+e^-$ and hadron colliders
论文作者
论文摘要
观察True Tauonium的可行性，即两个Tau Leptons的结合状态，$ \ Mathcal {t} _0 \ equiv（τ^+τ^ - ）_ 0 $，通过$ e^+e^ - $ $ colliders和lhc的photon-photon碰撞。该过程$γγ\至\ Mathcal {t} _0 \toγγ$的生产横截面以及所有相关背景的生产：Spin-0和2个Charmon chonmon谐振衰减到diphotons，以及逐光的散射 - 在$ e^+e^+e^+e^+e^+e^+e^y-e^y-e^y-e^y-e^y-e^y-e^+coltivesion中计算= 3.8 $ GEV），Belle II（$ \ sqrt {s} = 10.6 $ GEV）和FCC-EE（$ \ sqrt {s} = 91.2 $ GEV），以及超层P-P，P-P，P-PB和PB-PB在LHC处的碰撞。尽管很小的$ \ Mathcal {t} _0 $生产横截面，并且最终状态被重叠的伪内分和张量charmonium状态淹没 - $ \ mathrm {χ_{c2}}}} $，$ \ Mathrm {从$ \ Mathcal {t} _0 $ peak中分别拥有2.5、84和139 MEV的质量 - 在Belle II和FCC-EE上，对最重的Leptonium的基础状态似乎是可行的，并且具有IR可irreducible-irreduccible siturencible flough-ir可行的测量。
The feasibility of observing true tauonium, the bound state of two tau leptons, $\mathcal{T}_0\equiv(τ^+τ^-)_0$, via photon-photon collisions at $e^+e^-$ colliders and at the LHC, is studied. The production cross sections of the process $γγ\to\mathcal{T}_0\toγγ$ -- as well as those of all relevant backgrounds: spin-0 and 2 charmonium resonances decaying to diphotons, and light-by-light scattering -- are computed in the equivalent photon approximation for $e^+e^-$ collisions at BES III ($\sqrt{s} = 3.8$ GeV), Belle II ($\sqrt{s} = 10.6$ GeV), and FCC-ee ($\sqrt{s} = 91.2$ GeV), as well as for ultraperipheral p-p, p-Pb, and Pb-Pb collisions at the LHC. Despite small $\mathcal{T}_0$ production cross sections and a final state swamped by decays from overlapping pseudoscalar and tensor charmonium states -- the $\mathrm{χ_{c2}}$, $\mathrm{η_{c}(2S)}$, and $\mathrm{χ_{c0}}$ states have masses only 2.5, 84, and 139 MeV away, respectively, from the $\mathcal{T}_0$ peak -- evidence and observation of the ground state of the heaviest leptonium appears feasible at Belle II and FCC-ee, respectively, with in-situ high-precision measurements of the irreducible backgrounds.
