Letter
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Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

J. P. Lees , V. Poireau , V. Tisserand , E. Grauges , A. Palano , G. Eigen , D. N. Brown , Yu. G. Kolomensky , M. Fritsch et al. (BABAR Collaboration)

M. Fritsch , H. Koch , R. Cheaib , C. Hearty , T. S. Mattison , J. A. McKenna , R. Y. So , V. E. Blinov , A. R. Buzykaev , V. P. Druzhinin , E. A. Kozyrev , E. A. Kravchenko , S. I. Serednyakov , Yu. I. Skovpen , E. P. Solodov , K. Yu. Todyshev , A. J. Lankford , B. Dey , J. W. Gary , O. Long , A. M. Eisner , W. S. Lockman , W. Panduro Vazquez , D. S. Chao , C. H. Cheng , B. Echenard , K. T. Flood , D. G. Hitlin , Y. Li , D. X. Lin , S. Middleton , T. S. Miyashita , P. Ongmongkolkul , J. Oyang , F. C. Porter , M. Röhrken , B. T. Meadows , M. D. Sokoloff , J. G. Smith , S. R. Wagner , D. Bernard , M. Verderi , D. Bettoni , C. Bozzi , R. Calabrese , G. Cibinetto , E. Fioravanti , I. Garzia , E. Luppi , V. Santoro , A. Calcaterra , R. de Sangro , G. Finocchiaro , S. Martellotti , P. Patteri , I. M. Peruzzi , M. Piccolo , M. Rotondo , A. Zallo , S. Passaggio , C. Patrignani , B. J. Shuve , H. M. Lacker , B. Bhuyan , U. Mallik , C. Chen , J. Cochran , S. Prell , A. V. Gritsan , N. Arnaud , D. Bai , M. Davier , F. Le Diberder , L. Li , A. M. Lutz , G. Wormser , Z. Zhang , D. J. Lange , D. M. Wright , J. P. Coleman , D. E. Hutchcroft , D. J. Payne , C. Touramanis , A. J. Bevan , F. Di Lodovico , G. Cowan , Sw. Banerjee , D. N. Brown , C. L. Davis , A. G. Denig , W. Gradl , K. Griessinger , A. Hafner , K. R. Schubert , R. J. Barlow , G. D. Lafferty , R. Cenci , A. Jawahery , D. A. Roberts , R. Cowan , S. H. Robertson , R. M. Seddon , N. Neri , F. Palombo , L. Cremaldi , R. Godang , D. J. Summers ^*, G. De Nardo , C. Sciacca , C. P. Jessop , J. M. LoSecco , K. Honscheid , A. Gaz , M. Margoni , G. Simi , F. Simonetto , R. Stroili , S. Akar , E. Ben-Haim , M. Bomben , G. R. Bonneaud , G. Calderini , J. Chauveau , B. Malaescu , G. Marchiori , J. Ocariz , M. Biasini , E. Manoni , A. Rossi , G. Batignani , S. Bettarini , M. Carpinelli , G. Casarosa , M. Chrzaszcz , F. Forti , M. A. Giorgi , A. Lusiani , B. Oberhof , E. Paoloni , M. Rama , G. Rizzo , J. J. Walsh , L. Zani , A. J. S. Smith , F. Anulli , R. Faccini , F. Ferrarotto , F. Ferroni , A. Pilloni , C. Bünger , S. Dittrich , O. Grünberg , T. Leddig , C. Voß , R. Waldi , T. Adye , F. F. Wilson , S. Emery , G. Vasseur , D. Aston , C. Cartaro , M. R. Convery , W. Dunwoodie , M. Ebert , R. C. Field , B. G. Fulsom , M. T. Graham , C. Hast , P. Kim , S. Luitz , D. B. MacFarlane , D. R. Muller , H. Neal , B. N. Ratcliff , A. Roodman , M. K. Sullivan , J. Va’vra , W. J. Wisniewski , M. V. Purohit , J. R. Wilson , S. J. Sekula , H. Ahmed , N. Tasneem , M. Bellis , P. R. Burchat , E. M. T. Puccio , J. A. Ernst , R. Gorodeisky , N. Guttman , D. R. Peimer , A. Soffer , S. M. Spanier , J. L. Ritchie , J. M. Izen , X. C. Lou , F. Bianchi , F. De Mori , A. Filippi , L. Lanceri , L. Vitale , F. Martinez-Vidal , A. Oyanguren , J. Albert , A. Beaulieu , F. U. Bernlochner , G. J. King , R. Kowalewski , T. Lueck , C. Miller , I. M. Nugent , J. M. Roney , R. J. Sobie , T. J. Gershon , P. F. Harrison , T. E. Latham , and S. L. Wu (BABAR Collaboration)

^*Deceased.

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Phys. Rev. D 108, L111103 – Published 21 December, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L111103

Abstract

A dedicated measurement of additional radiation in $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ initial-state-radiation events is presented using the full BABAR data sample. For the first time results are presented at next-to- and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. Comparison with predictions from phokhara and afkqed Monte Carlo generators is performed, revealing discrepancies in the one-photon rates and angular distributions for the former. This disagreement has a negligible effect on the BABAR measurement of the $e^{+} e^{-} \to π^{+} π^{-} (γ)$ cross section, but could affect other measurements significantly. This study sheds a new light on the longstanding discrepancy in this channel that affects the theoretical prediction of hadronic vacuum polarization contributions to the muon magnetic moment anomaly.

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Phys. Rev. D 108, L111103– Published 21 December, 2023

Vol. 108, Iss. 11 — 1 December 2023

Received 11 August 2023
Revised 16 October 2023
Accepted 14 November 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L111103

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR

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Measurement of additional radiation in the initial-state-radiation processes e+e−→μ+μ−γ and e+e−→π+π−γ at BABAR

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Measurement of additional radiation in the initial-state-radiation processes $e^{+} e^{-} \to μ^{+} μ^{-} γ$ and $e^{+} e^{-} \to π^{+} π^{-} γ$ at BABAR