Study of $t\bar{t}$ threshold effects in $eμ$ differential distributions measured in $\sqrt{s}=13$\,TeV $pp$ collisions with the ATLAS detector
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866915977075097600 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | The recent ATLAS measurement of the normalised $eμ$ dilepton invariant mass and azimuthal angle distributions in $\sqrt{s}=13$\,TeV $pp$ collisions at the Large Hadron Collider is extended to study the sensitivity to the formation of quasi-bound states near the $t\bar{t}$ threshold. The measured differential distributions are compared with $t\bar{t}$ models incorporating perturbative QCD predictions for the hard process, with or without the addition of colour-singlet quasi-bound states. The data are better described by the predictions incorporating quasi-bound-state formation. Fits to the dilepton invariant mass distribution show evidence for the latter process with an observed significance exceeding three standard deviations, and a measured cross-section in agreement with dedicated studies of the threshold region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_02341 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Study of $t\bar{t}$ threshold effects in $eμ$ differential distributions measured in $\sqrt{s}=13$\,TeV $pp$ collisions with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment The recent ATLAS measurement of the normalised $eμ$ dilepton invariant mass and azimuthal angle distributions in $\sqrt{s}=13$\,TeV $pp$ collisions at the Large Hadron Collider is extended to study the sensitivity to the formation of quasi-bound states near the $t\bar{t}$ threshold. The measured differential distributions are compared with $t\bar{t}$ models incorporating perturbative QCD predictions for the hard process, with or without the addition of colour-singlet quasi-bound states. The data are better described by the predictions incorporating quasi-bound-state formation. Fits to the dilepton invariant mass distribution show evidence for the latter process with an observed significance exceeding three standard deviations, and a measured cross-section in agreement with dedicated studies of the threshold region. |
| title | Study of $t\bar{t}$ threshold effects in $eμ$ differential distributions measured in $\sqrt{s}=13$\,TeV $pp$ collisions with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.02341 |