Single-spin measurements and heavy new physics in the $e^+e^- \to t\bar{t}$ process at an FCC-ee
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| Format: | Preprint |
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2025
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| _version_ | 1866915815130923008 |
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| author | Cao, Haotian Petriello, Frank |
| author_facet | Cao, Haotian Petriello, Frank |
| contents | We investigate the potential of single-spin components of the spin-density matrix in the $e^+ e^- \to t\bar{t}$ process at a future FCC-ee for probing heavy new physics parametrized using the SMEFT framework. We consider the full spectrum of spin observables and the complete angular decomposition of the $t\bar{t}$ production process in our study. We find that single-spin measurements generically provide stronger probes of SMEFT Wilson coefficients than measurements where the $t\bar{t}$ spins are correlated, and that single-spin observables are important for resolving flat directions that can appear in the Wilson-coefficient parameter space. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_01994 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single-spin measurements and heavy new physics in the $e^+e^- \to t\bar{t}$ process at an FCC-ee Cao, Haotian Petriello, Frank High Energy Physics - Phenomenology We investigate the potential of single-spin components of the spin-density matrix in the $e^+ e^- \to t\bar{t}$ process at a future FCC-ee for probing heavy new physics parametrized using the SMEFT framework. We consider the full spectrum of spin observables and the complete angular decomposition of the $t\bar{t}$ production process in our study. We find that single-spin measurements generically provide stronger probes of SMEFT Wilson coefficients than measurements where the $t\bar{t}$ spins are correlated, and that single-spin observables are important for resolving flat directions that can appear in the Wilson-coefficient parameter space. |
| title | Single-spin measurements and heavy new physics in the $e^+e^- \to t\bar{t}$ process at an FCC-ee |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.01994 |