Journal Article

PUBDB-2024-07239

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hadronic vacuum polarization in the muon g − 2: the short-distance contribution from lattice QCD

Kuberski, S. (Corresponding author)Extern* ; Cè, M. ; von Hippel, G. ; Meyer, H. B. ; Ottnad, K. ; Risch, A.DESY* ; Wittig, H.

2024
SISSA [Trieste]

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Please use a persistent id in citations: doi:10.1007/JHEP03(2024)172  doi:10.3204/PUBDB-2024-07239

Report No.: CERN-TH-2024-011; MITP-24-011; arXiv:2401.11895

Abstract: We present results for the short-distance window observable of the hadronic vacuum polarization contribution to the muon g – 2, computed via the time-momentum representation (TMR) in lattice QCD. A key novelty of our calculation is the reduction of discretization effects by a suitable subtraction applied to the TMR kernel function, which cancels the leading ${x}_{0}^{4}$-behaviour at short distances. To compensate for the subtraction, one must substitute a term that can be reliably computed in perturbative QCD. We apply this strategy to our data for the vector current collected on ensembles generated with 2 + 1 flavours of O(a)-improved Wilson quarks at six values of the lattice spacing and pion masses in the range 130 – 420 MeV. Our estimate at the physical point contains a full error budget and reads ${\left({a}_{\mu }^{{\text{hvp}}}\right)}^{{\text{SD}}}$ = 68.85(14)$_{stat}$ (42)$_{syst}$·10$^{−10}$, which corresponds to a relative precision of 0.7%. We discuss the implications of our result for the observed tensions between lattice and data-driven evaluations of the hadronic vacuum polarization.

Keyword(s): vacuum polarization: hadronic ; current: vector ; quantum chromodynamics: perturbation theory ; quark: Wilson ; pi: mass ; effect: discrete ; muon ; lattice ; magnetic moment ; lattice field theory ; tension ; flavor ; Hadronic Spectroscopy ; Structure and Interactions ; Lattice QCD

Note: 37 pages, 10 figures, 9 tables

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Contributing Institute(s):

1. Zeuthen Particle PhysicsTheory (Z_ZPPT)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390831469 - EXC 2118: Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA+) (390831469) (390831469)
3. DFG project G:(GEPRIS)399400745 - Präzision für Seequark-Beiträge in der Gitter-QCD (399400745) (399400745)
4. DFG project G:(GEPRIS)390686111 - EXC 2048: CEPLAS - Exzellenzcluster für Pflanzenwissenschaften (390686111) (390686111)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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Database coverage:
; ; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Kuberski, S. (Corresponding author)Extern* ; Cè, M. ; von Hippel, G.DESY* ; Meyer, H. B. ; Ottnad, K. ; Risch, A.DESY* ; Wittig, H.
Hadronic vacuum polarization in the muon g − 2: the short-distance contribution from lattice QCD
[10.3204/PUBDB-2025-00411]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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