{"id":"doi:10.1103/physrevd.107.074506","kind":"article","title":"Lattice calculation of the short and intermediate time-distance hadronic vacuum polarization contributions to the muon magnetic moment using twisted-mass fermions","authors":["Constantia Alexandrou","Simone Bacchio","P. Dimopoulos","Jacob Finkenrath","R. Frezzotti","G. Gagliardi","Marco Garofalo","Kyriakos Hadjiyiannakou","Bartosz Kostrzewa","Karl Jansen","Vittorio Lubicz B","Marcus Petschlies","Francesco Sanfilippo","Silvano Simula","Carsten Urbach","Urs Wenger"],"author_count":16,"year":2023,"published":"2023-04-19","venue":"Physical review. D/Physical review. D.","cited_by":179,"doi":"10.1103/physrevd.107.074506","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1103/physrevd.107.074506","archive_url":"https://space-kitty.com/papers/doi:10.1103/physrevd.107.074506","updated":null,"pmid":null,"pmcid":null,"openalex_id":"W4366442068","pdf_url":"http://link.aps.org/pdf/10.1103/PhysRevD.107.074506","abstract":"We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, ${a}_{\\ensuremath{\\mu}}^{\\mathrm{HVP}}$, in the so-called short and intermediate time-distance windows, ${a}_{\\ensuremath{\\mu}}^{\\mathrm{SD}}$ and ${a}_{\\ensuremath{\\mu}}^{\\mathrm{W}}$, defined by the RBC/UKQCD Collaboration [Phys. Rev. Lett. 121, 022003 (2018)]. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with ${N}_{f}=2+1+1$ flavors of Wilson-clover twisted-mass quarks with masses of all the dynamical quark flavors tuned close to their physical values. The simulations are carried out at three values of the lattice spacing equal to $\\ensuremath{\\simeq}0.057$, 0.068 and 0.080 fm with spatial lattice sizes up to $L\\ensuremath{\\simeq}7.6\\text{ }\\text{ }\\mathrm{fm}$. For the short-distance window we obtain ${a}_{\\ensuremath{\\mu}}^{\\mathrm{SD}}(\\mathrm{ETMC})=69.27(34)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$, which is consistent with the recent dispersive value of ${a}_{\\ensuremath{\\mu}}^{\\mathrm{SD}}({e}^{+}{e}^{\\ensuremath{-}})=68.4(5)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$ [, Phys. Lett. B 833, 137313 (2022)]. In the case of the intermediate window we get the value ${a}_{\\ensuremath{\\mu}}^{\\mathrm{W}}(\\mathrm{ETMC})=236.3(1.3)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$, which is consistent with the result ${a}_{\\ensuremath{\\mu}}^{\\mathrm{W}}(\\mathrm{BMW})=236.7(1.4)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$ [, Nature (London) 593, 51 (2021)] by the BMW Collaboration as well as with the recent determination by the CLS/Mainz group of ${a}_{\\ensuremath{\\mu}}^{\\mathrm{W}}(\\mathrm{CLS})=237.30(1.46)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$ [, Phys. Rev. D 106, 114502 (2022)]. However, it is larger than the dispersive result of ${a}_{\\ensuremath{\\mu}}^{\\mathrm{W}}({e}^{+}{e}^{\\ensuremath{-}})=229.4(1.4)\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}10}$ by approximately 3.6 standard deviations. The tension increases to approximately 4.5 standard deviations if we average our ETMC result with those by BMW and CLS/Mainz. Our accurate lattice results in the short and intermediate windows point to a possible deviation of the ${e}^{+}{e}^{\\ensuremath{-}}$ cross section data with respect to Standard Model predictions in the low- and intermediate-energy regions but not in the high-energy region.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Quantum Chromodynamics and Particle Interactions"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Lattice calculation of the short and intermediate time-distance hadronic vacuum polarization contributions to the muon magnetic moment using twisted-mass fermions\" by Constantia Alexandrou, Simone Bacchio, P. Dimopoulos et al., https://doi.org/10.1103/physrevd.107.074506, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified.","topics":[{"slug":"particle-physics-bsm","name":"Particle Physics & Beyond the Standard Model","domain_slug":"physics"}],"cited_in_dossiers":[{"slug":"particle-physics-bsm","title":"Particle Physics & Beyond the Standard Model: State of the Field (October 2026)","url":"https://space-kitty.com/dossiers/particle-physics-bsm"}]}