Bottom quark forward-backward asymmetry at the future electron-positron collider FCC-ee
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917912160239616 |
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| author | Cobal, Marina Guerrieri, Giovanni Khanpour, Hamzeh Panizzo, Giancarlo Pinamonti, Michele Pintucci, Laura Toffolin, Leonardo |
| author_facet | Cobal, Marina Guerrieri, Giovanni Khanpour, Hamzeh Panizzo, Giancarlo Pinamonti, Michele Pintucci, Laura Toffolin, Leonardo |
| contents | The Standard Model (SM) prediction for the \PZ-boson pole $b$-quark forward-backward (FB) asymmetry is: $(A_{FB}^{0,b})_{th} = 0.1030 \pm 0.0002$. The LEP electron-positron collider measured instead $A_{FB}^{0,b} = 0.0992 \pm 0.0016$, value which presents the largest discrepancy with any of the SM predictions as of today. All the $A_{FB}^b$ measurements performed at LEP suffered however of an important statistical uncertainty and of different sources of systematic uncertainties. This study shows that the proposed high-luminosity electron-positron collider FCC-ee, collecting orders of magnitude more data at the \PZ-pole than LEP, will significantly reduce the statistical uncertainties on the measurement of $A_{FB}^{0,b}$, thus allowing us to shed further light on this tension. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_17677 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bottom quark forward-backward asymmetry at the future electron-positron collider FCC-ee Cobal, Marina Guerrieri, Giovanni Khanpour, Hamzeh Panizzo, Giancarlo Pinamonti, Michele Pintucci, Laura Toffolin, Leonardo High Energy Physics - Phenomenology High Energy Physics - Experiment The Standard Model (SM) prediction for the \PZ-boson pole $b$-quark forward-backward (FB) asymmetry is: $(A_{FB}^{0,b})_{th} = 0.1030 \pm 0.0002$. The LEP electron-positron collider measured instead $A_{FB}^{0,b} = 0.0992 \pm 0.0016$, value which presents the largest discrepancy with any of the SM predictions as of today. All the $A_{FB}^b$ measurements performed at LEP suffered however of an important statistical uncertainty and of different sources of systematic uncertainties. This study shows that the proposed high-luminosity electron-positron collider FCC-ee, collecting orders of magnitude more data at the \PZ-pole than LEP, will significantly reduce the statistical uncertainties on the measurement of $A_{FB}^{0,b}$, thus allowing us to shed further light on this tension. |
| title | Bottom quark forward-backward asymmetry at the future electron-positron collider FCC-ee |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.17677 |