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| Format: | Preprint |
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2025
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| Accès en ligne: | https://arxiv.org/abs/2501.14806 |
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| _version_ | 1866912203318231040 |
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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 $pp \to tW^-X$ by means of T-odd observables. One such observable is the polarization of the top quark transverse to the production plane. Another is the asymmetry between the cross sections with a positive and with a negative value of a certain T-odd correlation constructed out of observable momenta when the top quark decays leptonically. The mean value of this correlation, which is also T-odd, is the third observable. These three T-odd observables are shown to be proportional to the imaginary part of only one of the $tbW$ anomalous couplings, the other couplings giving vanishing contributions. This imaginary part could signal either a CP-odd coupling, or an absorptive part in the effective coupling. We estimate the 1-$σ$ limits that might be derived in the case of each of these observables for centre-of-mass energies 7, 8, 13 and 14 TeV at the LHC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14806 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | T-odd observables from anomalous $tbW$ couplings in single-top W associated production at the LHC Rindani, Saurabh D. High Energy Physics - Phenomenology We investigate the possibility that an imaginary anomalous $tbW$ coupling can be measured in the process $pp \to tW^-X$ by means of T-odd observables. One such observable is the polarization of the top quark transverse to the production plane. Another is the asymmetry between the cross sections with a positive and with a negative value of a certain T-odd correlation constructed out of observable momenta when the top quark decays leptonically. The mean value of this correlation, which is also T-odd, is the third observable. These three T-odd observables are shown to be proportional to the imaginary part of only one of the $tbW$ anomalous couplings, the other couplings giving vanishing contributions. This imaginary part could signal either a CP-odd coupling, or an absorptive part in the effective coupling. We estimate the 1-$σ$ limits that might be derived in the case of each of these observables for centre-of-mass energies 7, 8, 13 and 14 TeV at the LHC. |
| title | T-odd observables from anomalous $tbW$ couplings in single-top W associated production at the LHC |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2501.14806 |