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Title: The muon anomalous magnetic moment and the pion polarizability

We compute the charged pion loop contribution to the muon anomalous magnetic moment , taking into account the previously omitted effect of the charged pion polarizability, (α 11) π+. Here, 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 may increase the disagreement between the present experimental value for α μ and the theoretical, Standard Model prediction by as much as ~60 x 10 -11 depending on the value of (α 11) π+ and the choice of the model. The planned determination of (α 11) 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 α μ.
Authors:
 [1] ;  [2]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Massachusetts, Amherst, MA (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Grant/Contract Number:
SC0011095; FG02-92ER40701; FG02-08ER41531
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 738; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1198381
Alternate Identifier(s):
OSTI ID: 1441364

Engel, Kevin T., and Ramsey-Musolf, Michael J.. The muon anomalous magnetic moment and the pion polarizability. United States: N. p., Web. doi:10.1016/j.physletb.2014.09.006.
Engel, Kevin T., & Ramsey-Musolf, Michael J.. The muon anomalous magnetic moment and the pion polarizability. United States. doi:10.1016/j.physletb.2014.09.006.
Engel, Kevin T., and Ramsey-Musolf, Michael J.. 2014. "The muon anomalous magnetic moment and the pion polarizability". United States. doi:10.1016/j.physletb.2014.09.006.
@article{osti_1198381,
title = {The muon anomalous magnetic moment and the pion polarizability},
author = {Engel, Kevin T. and Ramsey-Musolf, Michael J.},
abstractNote = {We compute the charged pion loop contribution to the muon anomalous magnetic moment , taking into account the previously omitted effect of the charged pion polarizability, (α1-β1)π+. Here, 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 may increase the disagreement between the present experimental value for αμ and the theoretical, Standard Model prediction by as much as ~60 x 10-11 depending on the value of (α1-β1)π+ and the choice of the model. The planned determination of (α1-β1)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 αμ.},
doi = {10.1016/j.physletb.2014.09.006},
journal = {Physics Letters. Section B},
number = C,
volume = 738,
place = {United States},
year = {2014},
month = {9}
}