Test of lepton flavour universality in $W$-boson decays into electrons and $τ$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916776642609152 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | A measurement of the ratio of the branching fractions, $R_{τ/e} = B(W \to τν)/ B(W \to e ν)$, is performed using a sample of $W$ bosons originating from top-quark decays to final states containing $τ$-leptons or electrons. This measurement uses $pp$ collisions at $\sqrt{s}=13$ TeV, collected by the ATLAS experiment at the Large Hadron Collider during Run 2, corresponding to an integrated luminosity of 140 fb$^{-1}$. The $W \to τν_τ$ (with $τ\to e ν_e ν_τ$) and $W \to e ν_e$ decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions $R_{τ/e} = 0.975 \pm 0.012 \textrm{(stat.)} \pm 0.020 \textrm{(syst.)}$, is consistent with the Standard Model assumption of lepton flavour universality in $W$-boson decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_11989 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Test of lepton flavour universality in $W$-boson decays into electrons and $τ$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector ATLAS Collaboration High Energy Physics - Experiment A measurement of the ratio of the branching fractions, $R_{τ/e} = B(W \to τν)/ B(W \to e ν)$, is performed using a sample of $W$ bosons originating from top-quark decays to final states containing $τ$-leptons or electrons. This measurement uses $pp$ collisions at $\sqrt{s}=13$ TeV, collected by the ATLAS experiment at the Large Hadron Collider during Run 2, corresponding to an integrated luminosity of 140 fb$^{-1}$. The $W \to τν_τ$ (with $τ\to e ν_e ν_τ$) and $W \to e ν_e$ decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions $R_{τ/e} = 0.975 \pm 0.012 \textrm{(stat.)} \pm 0.020 \textrm{(syst.)}$, is consistent with the Standard Model assumption of lepton flavour universality in $W$-boson decays. |
| title | Test of lepton flavour universality in $W$-boson decays into electrons and $τ$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.11989 |