Heavy-quark contribution to the proton's magnetic moment

Xiangdong Ji; D. Toublan

doi:10.1016/j.physletb.2007.02.047

Heavy-quark contribution to the proton's magnetic moment

Physics Letters B ◽

10.1016/j.physletb.2007.02.047 ◽

2007 ◽

Vol 647 (5-6) ◽

pp. 361-365 ◽

Cited By ~ 5

Author(s):

Xiangdong Ji ◽

D. Toublan

Keyword(s):

Heavy Quark ◽

Magnetic Moment ◽

Quark Contribution

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Heavy quark and magnetic moment

Lettere al Nuovo Cimento ◽

10.1007/bf02776262 ◽

1979 ◽

Vol 25 (10) ◽

pp. 314-320 ◽

Cited By ~ 1

Author(s):

M. Ahmad ◽

M. Shafi Jallu

Keyword(s):

Heavy Quark ◽

Magnetic Moment

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Two-loop anomalous dimension of the chromo-magnetic moment of a heavy quark

Physics Letters B ◽

10.1016/s0370-2693(97)00345-6 ◽

1997 ◽

Vol 401 (1-2) ◽

pp. 81-90 ◽

Cited By ~ 33

Author(s):

G. Amorós ◽

M. Beneke ◽

M. Neubert

Keyword(s):

Heavy Quark ◽

Magnetic Moment ◽

Anomalous Dimension

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Hadronic Leading Order Contribution to the Muon g-2

EPJ Web of Conferences ◽

10.1051/epjconf/201817901016 ◽

2018 ◽

Vol 179 ◽

pp. 01016

Author(s):

Daisuke Nomura

Keyword(s):

Experimental Data ◽

Standard Model ◽

Magnetic Moment ◽

Anomalous Magnetic Moment ◽

Leading Order ◽

Muon Anomalous Magnetic Moment ◽

Order Contribution ◽

Quark Contribution ◽

The Standard Model ◽

Vacuum Polarisation

We calculate the Standard Model (SM) prediction for the muon anomalous magnetic moment. By using the latest experimental data for e+e- → hadrons as input to dispersive integrals, we obtain the values of the leading order (LO) and the next-to-leading-order (NLO) hadronic vacuum polarisation contributions as ahad, LO VPμ = (693:27 ± 2:46) × 10-10 and ahad, NLO VP μ = (_9.82 ± 0:04) × 1010-10, respectively. When combined with other contributions to the SM prediction, we obtain aμ(SM) = (11659182:05 ± 3.56) × 10-10; which is deviated from the experimental value by Δaμ(exp) _ aμ(SM) = (27.05 ± 7.26) × 10-10. This means that there is a 3.7 σ discrepancy between the experimental value and the SM prediction. We also discuss another closely related quantity, the running QED coupling at the Z-pole, α(M2 Z). By using the same e+e- → hadrons data as input, our result for the 5-flavour quark contribution to the running QED coupling at the Z pole is Δ(5)had(M2 Z) = (276.11 ± 1.11) × 10-4, from which we obtain Δ(M2 Z) = 128.946 ± 0.015.

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