T-odd observables from anomalous $tbW$ couplings in single-top production at an $ep$ collider
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912083954630656 |
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| author | Rindani, Saurabh D. |
| author_facet | Rindani, Saurabh D. |
| contents | We investigate the possibility that an imaginary anomalous $tbW$ coupling can be measured in the process $e^-p \to ν_e \overline t X$ by means of T-odd observables. One such observable considered here is the polarization of the top antiquark transverse to the production plane. The other is a T-odd correlation constructed out of observable momenta when the top quark decays leptonically. Both these T-odd observables are shown to be proportional to the imaginary part of only one of the $tbW$ anomalous couplings, the other couplings giving either vanishing or negligible contribution. This imaginary part could signal either a CP-odd coupling, or an absorptive part in the effective coupling, or both. We estimate the 1-$σ$ limits that might be derived in the case of each of these observables for a collider with a proton energy of 7 TeV and an electron energy of 60 GeV and also in the case of a higher electron energy of 150 GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_12643 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | T-odd observables from anomalous $tbW$ couplings in single-top production at an $ep$ collider Rindani, Saurabh D. High Energy Physics - Phenomenology High Energy Physics - Experiment We investigate the possibility that an imaginary anomalous $tbW$ coupling can be measured in the process $e^-p \to ν_e \overline t X$ by means of T-odd observables. One such observable considered here is the polarization of the top antiquark transverse to the production plane. The other is a T-odd correlation constructed out of observable momenta when the top quark decays leptonically. Both these T-odd observables are shown to be proportional to the imaginary part of only one of the $tbW$ anomalous couplings, the other couplings giving either vanishing or negligible contribution. This imaginary part could signal either a CP-odd coupling, or an absorptive part in the effective coupling, or both. We estimate the 1-$σ$ limits that might be derived in the case of each of these observables for a collider with a proton energy of 7 TeV and an electron energy of 60 GeV and also in the case of a higher electron energy of 150 GeV. |
| title | T-odd observables from anomalous $tbW$ couplings in single-top production at an $ep$ collider |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2409.12643 |