NLO EW corrections to tau pair production via photon fusion in Pb-Pb ultraperipheral collision
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917886995464192 |
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| author | Jiang, Jun Lu, Peng-Cheng Si, Zong-Guo Zhang, Han Zhang, Xin-Yi |
| author_facet | Jiang, Jun Lu, Peng-Cheng Si, Zong-Guo Zhang, Han Zhang, Xin-Yi |
| contents | We study the next-to-leading order (NLO) electroweak (EW) corrections to the $γγ\to τ^+ τ^-$ process in Pb-Pb ultraperipheral collision (UPC). We find that the EW correction $δσ_{\mathrm{EW}}$ decreases the total cross section $σ_{\mathrm{NLO}} = σ_{\mathrm{LO}} + δσ_{\mathrm{EW}}$ by -3\% at Pb-Pb center-of-mass energy $\sqrt{s_{NN}}=5.02$ TeV. The weak correction plays significant role whose contribution is about -4 times of that of QED. The CMS and ATLAS collaborations use the reaction $γγ\to τ^+ τ^-$ in Pb-Pb and proton-proton UPC to constrain tau's anomalous magnetic moment $a_τ$. By parameterizing the $γττ$ vertex with two form factors $F_{1,2}$, the cross section can be written as $σ_{a_τ} = σ_{\mathrm{LO}} + δσ_{a_τ}$, where $δσ_{a_τ}$ is proportional to $a_τ$. The impact of NLO EW corrections on $a_τ$ bounds in Pb-Pb UPC is limited, as the current experimental bounds are loose. We also find that various differential distributions of the two ratios $\mathrm{d} σ_{\mathrm{NLO}}/ \mathrm{d} σ_{\mathrm{LO}}$ and $\mathrm{d} σ_{a_τ}/ \mathrm{d} σ_{\mathrm{LO}}$ have different lineshapes. This work is significant to precisely study the interaction of $γττ$ via $γγ\to τ^+ τ^-$ process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_21963 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | NLO EW corrections to tau pair production via photon fusion in Pb-Pb ultraperipheral collision Jiang, Jun Lu, Peng-Cheng Si, Zong-Guo Zhang, Han Zhang, Xin-Yi High Energy Physics - Phenomenology We study the next-to-leading order (NLO) electroweak (EW) corrections to the $γγ\to τ^+ τ^-$ process in Pb-Pb ultraperipheral collision (UPC). We find that the EW correction $δσ_{\mathrm{EW}}$ decreases the total cross section $σ_{\mathrm{NLO}} = σ_{\mathrm{LO}} + δσ_{\mathrm{EW}}$ by -3\% at Pb-Pb center-of-mass energy $\sqrt{s_{NN}}=5.02$ TeV. The weak correction plays significant role whose contribution is about -4 times of that of QED. The CMS and ATLAS collaborations use the reaction $γγ\to τ^+ τ^-$ in Pb-Pb and proton-proton UPC to constrain tau's anomalous magnetic moment $a_τ$. By parameterizing the $γττ$ vertex with two form factors $F_{1,2}$, the cross section can be written as $σ_{a_τ} = σ_{\mathrm{LO}} + δσ_{a_τ}$, where $δσ_{a_τ}$ is proportional to $a_τ$. The impact of NLO EW corrections on $a_τ$ bounds in Pb-Pb UPC is limited, as the current experimental bounds are loose. We also find that various differential distributions of the two ratios $\mathrm{d} σ_{\mathrm{NLO}}/ \mathrm{d} σ_{\mathrm{LO}}$ and $\mathrm{d} σ_{a_τ}/ \mathrm{d} σ_{\mathrm{LO}}$ have different lineshapes. This work is significant to precisely study the interaction of $γττ$ via $γγ\to τ^+ τ^-$ process. |
| title | NLO EW corrections to tau pair production via photon fusion in Pb-Pb ultraperipheral collision |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.21963 |