The Z lineshape challenge: ppm and keV measurements
Autor: | Juan Alcaraz Maestre, A. Blondel, Mogens Dam, Patrick Janot |
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Přispěvatelé: | Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
Rok vydání: | 2021 |
Předmět: |
Physics beyond the Standard Model
Monte Carlo method pole General Physics and Astronomy HEAVY-QUARK Z0: mass 7. Clean energy 01 natural sciences High Energy Physics - Experiment law.invention High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) law quantum electrodynamics [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Boson Fluid Flow and Transfer Processes Physics Z0: decay modes new physics: search for hep-ph electron positron: colliding beams approx. 91 GeV-cms High Energy Physics - Phenomenology error: statistical proposed experiment numerical calculations: Monte Carlo Particle Physics - Experiment Z0: electroproduction Particle physics exceptional accelerator Z0: coupling FOS: Physical sciences electron positron: annihilation FORWARD-BACKWARD ASYMMETRIES Indirect evidence 0103 physical sciences Z0: width 010306 general physics Collider detector: design Particle Physics - Phenomenology electroweak interaction: mixing angle hep-ex 010308 nuclear & particles physics FCC-ee State (functional analysis) calibration sensitivity Orders of magnitude (time) [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] QCD CORRECTIONS Order of magnitude |
Zdroj: | Eur.Phys.J.Plus Eur.Phys.J.Plus, 2021, 136, pp.848. ⟨10.1140/epjp/s13360-021-01760-x⟩ Alcaraz Maestre, J, Blondel, A, Dam, M & Janot, P 2021, ' The Z lineshape challenge : ppm and keV measurements ', European Physical Journal Plus, vol. 136, no. 8, 848 . https://doi.org/10.1140/epjp/s13360-021-01760-x The European Physical Journal Plus |
ISSN: | 2190-5444 |
DOI: | 10.1140/epjp/s13360-021-01760-x |
Popis: | The FCC-ee offers powerful opportunities for direct or indirect evidence for physics beyond the Standard Model, via a combination of high precision measurements and searches for forbidden and rare processes and feebly coupled particles. A key element of FCC-ee physics program is the measurement of the Z lineshape from a total of $5\times 10^{12}$ Z bosons and a beam-energy calibration with relative uncertainty of $10^{-6}$. With this exceptionally large event sample, five orders of magnitude larger than that accumulated during the whole LEP1 operation at the Z pole, the defining parameters - $m_{\rm Z}$, $\Gamma_{\rm Z}$, $N_\nu$, $\sin^2\theta_{\rm W}^{\rm eff}$, $\alpha_{\rm S}(m_{\rm Z}^2)$, and $\alpha_{\rm QED}(m^2_{\rm Z})$ - can be extracted with a leap in accuracy of up to two orders of magnitude with respect to the current state of the art. The ultimate goal that experimental and theory systematic errors match the statistical accuracy (4\,keV on the Z mass and width, $3\times 10^{-6}$ on $\sin^2\theta_{\rm W}^{\rm eff}$, a relative $3\times 10^{-5}$ on $\alpha_{\rm QED}$, and less than 0.0001 on $\alpha_{\rm S}$) leads to highly demanding requirements on collider operation, beam instrumentation, detector design, computing facilities, theoretical calculations, and Monte Carlo event generators. Such precise measurements also call for innovative analysis methods, which require a joint effort and understanding between theorists, experimenters, and accelerator teams. Comment: Submitted to EPJ+ special issue: A future Higgs and Electroweak factory (FCC): Challenges towards discovery, Focus on FCC-ee |
Databáze: | OpenAIRE |
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