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Measurement of additional radiation in the initial-state-radiation processes e+e- --> mu+mu- gamma and e+e- --> pi+pi- gamma at BABAR

Academic Article
Publication Date:
2023
abstract:
A dedicated measurement of additional radiation in e+e− --> mu+mu- gamma and e+e- --> pi+pi- gamma 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- --> pi+ pi- (gamma) 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.
Iris type:
14.a.1 Articolo su rivista
List of contributors:
Lees, J.  P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D.  N.; Kolomensky, Yu.  G.; Fritsch, M.; Koch, H.; Cheaib, R.; Hearty, C.; Mattison, T.  S.; Mckenna, J.  A.; So, R.  Y.; Blinov, V.  E.; Buzykaev, A.  R.; Druzhinin, V.  P.; Kozyrev, E.  A.; Kravchenko, E.  A.; Serednyakov, S.  I.; Skovpen, Yu.  I.; Solodov, E.  P.; Todyshev, K.  Yu.; Lankford, A.  J.; Dey, B.; Gary, J.  W.; Long, O.; Eisner, A.  M.; Lockman, W.  S.; Panduro Vazquez, W.; Chao, D.  S.; Cheng, C.  H.; Echenard, B.; Flood, K.  T.; Hitlin, D.  G.; Li, Y.; Lin, D.  X.; Middleton, S.; Miyashita, T.  S.; Ongmongkolkul, P.; Oyang, J.; Porter, F.  C.; Röhrken, M.; Meadows, B.  T.; Sokoloff, M.  D.; Smith, J.  G.; Wagner, S.  R.; Bernard, D.; Verderi, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Santoro, V.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Martellotti, S.; Patteri, P.; Peruzzi, I.  M.; Piccolo, M.; Rotondo, M.; Zallo, A.; Passaggio, S.; Patrignani, C.; Shuve, B.  J.; Lacker, H.  M.; Bhuyan, B.; Mallik, U.; Chen, C.; Cochran, J.; Prell, S.; Gritsan, A.  V.; Arnaud, N.; Bai, D.; Davier, M.; Le Diberder, F.; Li, L.; Lutz, A.  M.; Wormser, G.; Zhang, Z.; Lange, D.  J.; Wright, D.  M.; Coleman, J.  P.; Hutchcroft, D.  E.; Payne, D.  J.; Touramanis, C.; Bevan, A.  J.; Di Lodovico, F.; Cowan, G.; Banerjee, Sw.; Brown, D.  N.; Davis, C.  L.; Denig, A.  G.; Gradl, W.; Griessinger, K.; Hafner, A.; Schubert, K.  R.; Barlow, R.  J.; Lafferty, G.  D.; Cenci, R.; Jawahery, A.; Roberts, D.  A.; Cowan, R.; Robertson, S.  H.; Seddon, R.  M.; Neri, N.; Palombo, F.; Cremaldi, L.; Godang, R.; Summers, D.  J.; De Nardo, G.; Sciacca, C.; Jessop, C.  P.; Losecco, J.  M.; Honscheid, K.; Gaz, A.; Margoni, M.; Simi, G.; Simonetto, F.; Stroili, R.; Akar, S.; Ben-Haim, E.; Bomben, M.; Bonneaud, G.  R.; Calderini, G.; Chauveau, J.; Malaescu, B.; Marchiori, G.; Ocariz, J.; Biasini, M.; Manoni, E.; Rossi, A.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Chrzaszcz, M.; Forti, F.; Giorgi, M.  A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Rama, M.; Rizzo, G.; Walsh, J.  J.; Zani, L.; Smith, A.  J.  S.; Anulli, F.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Pilloni, A.; Bünger, C.; Dittrich, S.; Grünberg, O.; Leddig, T.; Voß, C.; Waldi, R.; Adye, T.; Wilson, F.  F.; Emery, S.; Vasseur, G.; Aston, D.; Cartaro, C.; Convery, M.  R.; Dunwoodie, W.; Ebert, M.; Field, R.  C.; Fulsom, B.  G.; Graham, M.  T.; Hast, C.; Kim, P.; Luitz, S.; Macfarlane, D.  B.; Muller, D.  R.; Neal, H.; Ratcliff, B.  N.; Roodman, A.; Sullivan, M.  K.; Va’Vra, J.; Wisniewski, W.  J.; Purohit, M.  V.; Wilson, J.  R.; Sekula, S.  J.; Ahmed, H.; Tasneem, N.; Bellis, M.; Burchat, P.  R.; Puccio, E.  M.  T.; Ernst, J.  A.; Gorodeisky, R.; Guttman, N.; Peimer, D.  R.; Soffer, A.; Spanier, S.  M.; Ritchie, J.  L.; Izen, J.  M.; Lou, X.  C.; Bianchi, F.; De Mori, F.; Filippi, A.; Lanceri, L.; Vitale, L.; Martinez-Vidal, F.; Oyanguren, A.; Albert, J.; Beaulieu, A.; Bernlochner, F.  U.; King, G.  J.; Kowalewski, R.; Lueck, T.; Miller, C.; Nugent, I.  M.; Roney, J.  M.; Sobie, R.  J.; Gershon, T.  J.; Harrison, P.  F.; Latham, T.  E.; Wu, S.  L.
Authors of the University:
PILLONI Alessandro
Handle:
https://iris.unime.it/handle/11570/3292568
Published in:
PHYSICAL REVIEW D
Journal
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