Transverse spin asymmetries and the electron Yukawa coupling at an FCC-ee

Boughezal, Radja; Petriello, Frank; Şimşek, Kağan

doi:10.1103/physrevd.110.075026

Transverse spin asymmetries and the electron Yukawa coupling at an FCC-ee

Journal Article · Wed Oct 23 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.110.075026· OSTI ID:2473301

^[1]; Petriello, Frank ^[2]; ^[3]

Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States)

We show that measurements of single transverse-spin asymmetries at an 𝑒⁺⁢𝑒⁻ collider can enhance the sensitivity to the electron Yukawa coupling, possibly enabling observation of the Standard Model value for this quantity. We demonstrate that the significance in both the 𝑏⁢$$\overline{𝑏}$$ and semileptonic 𝑊⁢𝑊 final states can be enhanced by factors of up to 3 compared to inclusive cross-section determinations of this coupling for transversely polarized electrons. If the positrons can be simultaneously longitudinally polarized, even at the level of 30%, the significance can be enhanced by a factor of 5 or more. The method utilizes quantum interference between the Higgs signal and the continuum background and is also applicable in other 𝑊⁢𝑊 and 𝑍⁢𝑍 final states.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-06CH11357; FG02-91ER40684

OSTI ID:: 2473301

Alternate ID(s):: OSTI ID: 2998752

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 110; ISSN 2470-0010; ISSN 2470-0029

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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