Final report of the E821 muon anomalous magnetic moment measurement at BNL

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G. W. Bennett,² B. Bousquet,¹⁰ H. N. Brown,² G. Bunce,² R. M. Carey,¹ P. Cushman,¹⁰ G. T. Danby,² P. T. Debevec,⁸ M. Deile,¹³ H. Deng,¹³ W. Deninger,⁸ S. K. Dhawan,¹³ V. P. Druzhinin,³ L. Duong,¹⁰ E. Efstathiadis,¹ F. J. M. Farley,¹³ G. V. Fedotovich,³ S. Giron,¹⁰ F. E. Gray,⁸ D. Grigoriev,³ M. Grosse-Perdekamp,¹³ A. Grossmann,⁷ M. F. Hare,¹ D. W. Hertzog,⁸ X. Huang,¹ V. W. Hughes,¹³ M. Iwasaki,¹² K. Jungmann,^6,7 D. Kawall,¹³ M. Kawamura,¹² B. I. Khazin,³ J. Kindem,¹⁰ F. Krienen,¹ I. Kronkvist,¹⁰ A. Lam,¹ R. Larsen,² Y. Y. Lee,² I. Logashenko,^1,3 R. McNabb,^10,8 W. Meng,² J. Mi,² J. P. Miller,¹ Y. Mizumachi,¹¹ W. M. Morse,² D. Nikas,² C. J. G. Onderwater,^8,6 Y. Orlov,⁴ C. S. Özben,^2,8 J. M. Paley,¹ Q. Peng,¹ C. C. Polly,⁸ J. Pretz,¹³ R. Prigl,² G. zu Putlitz,⁷ T. Qian,¹⁰ S. I. Redin,^3,13 O. Rind,¹ B. L. Roberts,¹ N. Ryskulov,³ S. Sedykh,⁸ Y. K. Semertzidis,² P. Shagin,¹⁰ Yu. M. Shatunov,³ E. P. Sichtermann,¹³ E. Solodov,³ M. Sossong,⁸ A. Steinmetz,¹³ L. R. Sulak,¹ C. Timmermans,¹⁰ A. Trofimov,¹ D. Urner,⁸ P. von Walter,⁷ D. Warburton,² D. Winn,⁵ A. Yamamoto,⁹ and D. Zimmerman¹⁰

(Muon (g-2) Collaboration)

¹Department of Physics, Boston University, Boston, Massachusetts 02215, USA
²Brookhaven National Laboratory, Upton, New York 11973, USA
³Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
⁴Newman Laboratory, Cornell University, Ithaca, New York 14853, USA
⁵Fairfield University, Fairfield, Connecticut 06430, USA
⁶Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, NL-9747 AA, Groningen, The Netherlands
⁷Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany
⁸Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
⁹KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
¹⁰Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, USA
¹¹Science University of Tokyo, Tokyo, 153-8902, Japan
¹²Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
¹³Department of Physics, Yale University, New Haven, Connecticut 06520, USA

Received 26 January 2006; published 7 April 2006

Wepresent the final report from a series of precision measurementsof the muon anomalous magnetic moment, a_µ=(g-2)/2. The details ofthe experimental method, apparatus, data taking, and analysis are summarized.Data obtained at Brookhaven National Laboratory, using nearly equal samplesof positive and negative muons, were used to deduce a_µ(Expt)=11659208.0(5.4)(3.3)×10^-10,where the statistical and systematic uncertainties are given, respectively. Thecombined uncertainty of 0.54 ppm represents a 14-fold improvement compared toprevious measurements at CERN. The standard model value for a_µincludes contributions from virtual QED, weak, and hadronic processes. Whilethe QED processes account for most of the anomaly, thelargest theoretical uncertainty, [approximate]0.55 ppm, is associated with first-order hadronic vacuumpolarization. Present standard model evaluations, based on e⁺e^- hadronic crosssections, lie 2.2–2.7 standard deviations below the experimental result.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.73.072003
DOI:	10.1103/PhysRevD.73.072003
PACS:	13.40.Em; 12.15.Lk; 14.60.Ef 13.40.Em Electric and magnetic moments of elementary particles 12.15.Lk Electroweak radiative corrections 14.60.Ef Muons YEAR: 2006
KEYWORDS:	lepton magnetic moment, standard model, quantum electrodynamics, elementary particle weak interactions, vacuum (elementary particles), electron-positron interactions, muons

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