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The Muon Anomalous Magnetic Moment and the Pion Polarizability

Engel, Kevin T. and Ramsey-Musolf, Michael J. (2014) The Muon Anomalous Magnetic Moment and the Pion Polarizability. Physics Letters B, 738 . pp. 123-127. ISSN 0370-2693.

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We compute the charged pion loop contribution to the muon anomalous magnetic moment ɑ_µ, taking into account the effect of the charged pion polarizability, (ɑ_1 - β_1)_π^+. We evaluate this contribution using two different models that are consistent with the requirements of chiral symmetry in the low-momentum regime and perturbative quantum chromodynamics in the asymptotic region. The result increases the disagreement between the present experimental value for ɑ_µ and the theoretical, Standard Model prediction by as much as ~ 60 x 10^(-11), depending on the value of (ɑ_1 - β_1)_π^+ and the choice of the model. The planned determination of (ɑ_1 - β_1)_π^+ at Jefferson Laboratory will eliminate the dominant parametric error, leaving a theoretical model uncertainty commensurate with the error expected from planned Fermilab measurement of a_µ.

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URLURL TypeDescription Paper
Ramsey-Musolf, Michael J.0000-0001-8110-2479
Additional Information:© 2014 Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3. Received 4 April 2014; Received in revised form 13 August 2014; Accepted 3 September 2014; Available online 6 September 2014. We thank V. Cirigliano, J. Donoghue, B. Holstein, and R. Miski-men for useful conversations; J. Bijnens for providing input on the NLO/cut-off evaluation; and D. Hertzog and D. Kawall for critical reading of this manuscript. The work is partially supported by U.S. Department of Energy contracts DE-FG02-92-ER40701 (KTE) and DE-FG02-08ER41531 and DE-SC0011095 (MJRM) and the Wisconsin Alumni Research Foundation (MJRM).
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Department of Energy (DOE)DE-FG02-92-ER40701
Department of Energy (DOE)DE-FG02-08ER41531
Department of Energy (DOE)DE-SC0011095
Wisconsin Alumni Research FoundationUNSPECIFIED
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Record Number:CaltechAUTHORS:20130925-142110583
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Official Citation:Kevin T. Engel, Michael J. Ramsey-Musolf, The muon anomalous magnetic moment and the pion polarizability, Physics Letters B, Volume 738, 10 November 2014, Pages 123-127, ISSN 0370-2693, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41532
Deposited By: Ruth Sustaita
Deposited On:25 Sep 2013 21:48
Last Modified:03 Oct 2019 05:49

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