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SCET 2024

Apr 15 – 18, 2024
Salamanca, Colegio Arzobispo Fonseca
Europe/Madrid timezone

Local organising committee

Session

Session 5: alphaS determinations

Apr 16, 2024, 9:00 AM
Salón de Actos (Salamanca, Colegio Arzobispo Fonseca)

Salón de Actos

Salamanca, Colegio Arzobispo Fonseca

C/ Fonseca, 4, 37007 Salamanca, Spain.

Description

Chair: Thomas Becher

Presentation materials

There are no materials yet.

  1. 58. Assessment of $\alpha_s(m_Z)$ fits from $e^+e^−$ Event Shapes accounting for 3-Jet Power Corrections
    Miguel Benitez-Rathgeb (Universidad de Salamanca)
    4/16/24, 9:00 AM
    Talk

    In recent articles, the discussion on the treatment of Power Corrections in the three-jet limit, along with its influence on precision $\alpha_s$ determinations from fits to event shape experimental data, has attracted a lot of attention. On the basis of a factorization formula for the $e^+e^-$ thrust distribution, derived within soft-collinear effective theory, we discuss the treatment of...

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  2. 59. Revisiting strong-coupling determinations from $e^+e^-$ event shapes
    Prof. Guido Bell (University of Siegen)
    4/16/24, 9:30 AM
    Talk

    We explore systematic effects of renormalon cancellation schemes and perturbative scale choices on extractions of the strong coupling constant $\alpha_s(m_Z)$ and the leading non-perturbative shift parameter $\Omega_1$ from resummed predictions of hadronic event shapes in electron-positron collisions. Our analysis is based on thrust distributions to N$^3$LL$'$ accuracy in resummed perturbation...

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  3. 60. Theory Uncertainties and Correlations from Theory Nuisance Parameters
    Frank Tackmann (DESY)
    4/16/24, 10:00 AM
    Talk

    The interpretation of precision measurements requires theory predictions with reliable and meaningful uncertainties and in particular correct correlations. Theory correlations are for example essential when fitting to differential spectra, but our default scale-variation-based methods, among their many shortcomings, are incapable of providing correct correlations. This is becoming a severe...

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  4. 61. Extracting $\alpha_s$ from the Z $p_T$ spectrum
    Giulia Marinelli (DESY)
    4/16/24, 10:30 AM
    Talk

    We study the extraction of $\alpha_s$ from the $Z$ boson $p_T$ spectrum at low $p_T$ using resummed predictions up to N$^4$LL.
    Recently, the ATLAS collaboration presented a new extracted value for $\alpha_s$ which has been somewhat controversial due to its rather small theoretical uncertainties.
    We study in detail the various sources of uncertainty, including the perturbative uncertainty,...

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