The Z lineshape challenge: ppm and keV measurements

Autor: Juan Alcaraz Maestre, A. Blondel, Mogens Dam, Patrick Janot
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