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 -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 = 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.

Kuberski, S., Cè, M., von Hippel, G., Meyer, H., Ottnad, K., Risch, A., et al. (2024). Hadronic vacuum polarization in the muon g − 2: the short-distance contribution from lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS, 2024(3) [10.1007/jhep03(2024)172].

Hadronic vacuum polarization in the muon g − 2: the short-distance contribution from lattice QCD

Cè, M;
2024

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 -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 = 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.
Articolo in rivista - Articolo scientifico
Hadronic Spectroscopy; Lattice QCD; Structure and Interactions;
English
29-mar-2024
2024
2024
3
172
open
Kuberski, S., Cè, M., von Hippel, G., Meyer, H., Ottnad, K., Risch, A., et al. (2024). Hadronic vacuum polarization in the muon g − 2: the short-distance contribution from lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS, 2024(3) [10.1007/jhep03(2024)172].
File in questo prodotto:
File Dimensione Formato  
Kuberski-2024-JHEP-VoR.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Licenza: Creative Commons
Dimensione 1.58 MB
Formato Adobe PDF
1.58 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/469998
Citazioni
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
Social impact