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《中国物理C》(英文)编辑部
2024年10月30日

Hadronic light-by-light scattering contribution to the muon g-2

  • We review recent developments concerning the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. We first discuss why fully off-shell hadronic form factors should be used for the evaluation of this contribution to the g-2. We then reevaluate the numerically dominant pion-exchange contribution in the framework of large-NC QCD, using an off-shell pion-photon-photon form factor which fulfills all QCD short-distance constraints, in particular, a new short-distance constraint on the off-shell form factor at the external vertex in g-2, which relates the form factor to the quark condensate magnetic susceptibility in QCD. Combined with available evaluations of the other contributions to hadronic light-by-light scattering this leads to the new result aμLbyL; had=(116±40)×10-11, with a conservative error estimate in view of the many still unsolved problems. Some potential ways for further improvements are briefly discussed as well. For the electron we obtain the new estimate aeLbyL; had=(3.9±1.3)×10-14.

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  • [1] . Miller J P, de Rafael E, Roberts B L. Rep. Prog. Phys.,2007, 70: 7952. Jegerlehner F. Acta Phys. Pol. B, 2007, 38: 3021;Jegerlehner F. The Anomalous Magnetic Moment of theMuon. Springer Tracts Mod. Phys. Vol. 226. Berlin:Springer, 20083. Jegerlehner F, Ny eler A. Phys. Rept., 2009, 477: 14. For recent updates of the hadronic vacuum polarizationcontribution, see: Davier M et al. arXiv:0908.4300 [hep-ph]; Davier M. Talk at this conference; Teubner T. talk atthis conference5. Bijnens J, Prades J. Mod. Phys. Lett. A, 2007, 22: 7676. Prades J, de Rafael E, Vainshtein A. In: Lepton DipoleMoments, Roberts B L, Marciano W J. (eds). Singapore:World Scienti c, 2009, 309. arXiv:0901.0306 [hep-ph]7. de Rafael E. Phys. Lett. B, 1994, 322: 2398. Bijnens J, Pallante E, Prades J. Phys. Rev. Lett., 1995, 75:1447; 1995, 75: 3781(E); Nucl. Phys. B, 1996, 474: 379;2002, 626: 4109. Hayakawa M, Kinoshita T, Sanda A I. Phys. Rev. Lett.,1995, 75: 790; Phys. Rev. D, 1996, 54: 3137; HayakawaM, Kinoshita T. Phys. Rev. D, 1998, 57: 465; 2002, 66:019902(E)10. Knecht M, Ny eler A. Phys. Rev. D, 2002, 65: 073034;Knecht M et al. Phys. Rev. Lett., 2002, 88: 07180211. Melnikov K, Vainshtein A. Phys. Rev. D, 2004, 70: 11300612. Bijnens J, Persson F. hep-ph/010613013. Nyffeler A. Phys. Rev. D, 2009, 79: 07301214. Wess J, Zumino B. Phys. Lett. B, 1971, 37: 95; Witten E.Nucl. Phys. B, 1983, 223: 42215. Knecht M, Ny eler A. Eur. Phys. J. C, 2001, 21: 65916. Io e B L, Smilga A V. Nucl. Phys. B, 1984, 232: 10917. Balitsky I I, Yung A V. Phys. Lett. B, 1983, 129: 328; Balitsky I I, Kolesnichenko A V, Yung A V. Yad. Fiz. 1985,41, 282; Petrov V Y et al. Phys. Rev. D, 1999, 59: 114018;Ball P, Braun V M, Kivel N. Nucl. Phys. B, 2003, 649,263; Dorokhov A E. Eur. Phys. J. C, 2005, 42: 309; MateuV, Portoles J. Eur. Phys. J. C, 2007, 52: 325; RohrwildJ. JHEP, 2007, 0709: 073; Goeke K et al. Phys. Rev. D,2007, 76: 116007; Io e B L. Phys. Lett. B, 2009, 678: 512;Buividovich P V et al. Nucl. Phys. B, 2010, 826: 31318. Belyaev V M, Kogan Y I. Yad. Fiz., 1984, 40: 1035; Vain-shtein A. Phys. Lett. B, 2003, 569: 187; Narison S. Phys.Lett. B, 2008, 666: 45519. Moussallam B, Stern J. hep-ph/9404353; Moussallam B.Phys. Rev. D, 1995, 51: 4939; Moussallam B. Nucl. Phys.B, 1997, 504: 381; Peris S, Perrottet M, de Rafael E. J.High Energy Phys., 1998, 05: 011; Knecht M et al. Phys.Rev. Lett., 1999, 83: 523020. Behrend H J et al (The CELLO collaboration). Z. Phys. C,1991, 49: 401; Gronberg J et al (The CLEO collaboration).Phys. Rev. D, 1998, 57: 3321. Aubert B et al (The BABAR collaboration). Phys. Rev. D,2009, 80: 052002; Druzhinin V P. talk at this conference22. Lepage G P, Brodsky S J. Phys. Rev. D, 1980, 22: 2157;Brodsky S J, Lepage G P. Phys. Rev. D, 1981, 24: 180823. Chernyak V L. arXiv:0912.0623 [hep-ph], these proceedings24. Nyffeler A. arXiv:0912.1441 [hep-ph]25. Dorokhov A E, Broniowski W. Phys. Rev. D, 2008, 78:07301126. Hong D K, Kim D. Phys. Lett. B, 2009, 680: 48027. Roberts B L. Nucl. Phys. B (Proc. Suppl.), 2004, 131: 157;Carey R M et al. Proposal of the BNL Experiment E969.2004. J-PARC Letter of Intent L17; Hertzog D W. Nucl.Phys. Proc. Suppl., 2008, 181-182: 5; Roberts B L. talkat this conference; Mibe T. talk at this conference28. Hayakawa M et al. PoS, 2006, LAT2005, 353 [arXiv:hep-lat/0509016]; Blum T, Chowdhury S. Nucl. Phys. Proc.Suppl., 2009, 189: 25129. Venanzoni G. talk at this conference
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A. Nyffeler. Hadronic light-by-light scattering contribution to the muon g-2[J]. Chinese Physics C, 2010, 34(6): 705-711. doi: 10.1088/1674-1137/34/6/016
A. Nyffeler. Hadronic light-by-light scattering contribution to the muon g-2[J]. Chinese Physics C, 2010, 34(6): 705-711.  doi: 10.1088/1674-1137/34/6/016 shu
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Hadronic light-by-light scattering contribution to the muon g-2

    Corresponding author: A. Nyffeler,
  • Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad - 211019, India

Abstract: 

We review recent developments concerning the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. We first discuss why fully off-shell hadronic form factors should be used for the evaluation of this contribution to the g-2. We then reevaluate the numerically dominant pion-exchange contribution in the framework of large-NC QCD, using an off-shell pion-photon-photon form factor which fulfills all QCD short-distance constraints, in particular, a new short-distance constraint on the off-shell form factor at the external vertex in g-2, which relates the form factor to the quark condensate magnetic susceptibility in QCD. Combined with available evaluations of the other contributions to hadronic light-by-light scattering this leads to the new result aμLbyL; had=(116±40)×10-11, with a conservative error estimate in view of the many still unsolved problems. Some potential ways for further improvements are briefly discussed as well. For the electron we obtain the new estimate aeLbyL; had=(3.9±1.3)×10-14.

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