Evidence of a Broad Structure at an Invariant Mass of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4.32</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi><mml:mo>/</mml:mo><mml:msup><mml:mi>c</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>in the Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>2</mml:mn><mml:mi>S</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>Measured at<i>BABAR</i>
B. Aubert(Laboratoire d’Annecy de Physique des Particules), R. Barate(Laboratoire d’Annecy de Physique des Particules), M. Bóna(Laboratoire d’Annecy de Physique des Particules), D. Boutigny(Laboratoire d’Annecy de Physique des Particules), F. Couderc(Laboratoire d’Annecy de Physique des Particules), Y. Karyotakis(Laboratoire d’Annecy de Physique des Particules), J. P. Lees(Laboratoire d’Annecy de Physique des Particules), V. Poireau(Laboratoire d’Annecy de Physique des Particules), V. Tisserand(Laboratoire d’Annecy de Physique des Particules), A. Zghiche(Laboratoire d’Annecy de Physique des Particules), E. Graugés(Universitat de Barcelona), A. Palano(Istituto Nazionale di Fisica Nucleare, Sezione di Bari), J. C. Chen(Institute of High Energy Physics), N. D. Qi(Institute of High Energy Physics), G. Rong(Institute of High Energy Physics), P. Wang(Institute of High Energy Physics), Y. S. Zhu(Institute of High Energy Physics), G. Eigen(University of Bergen), I. Ofte(University of Bergen), B. Stugu(University of Bergen), G. S. Abrams(Lawrence Berkeley National Laboratory), M. Battaglia(Lawrence Berkeley National Laboratory), David Norvil Brown(University of Louisville), J. Button‐Shafer(Lawrence Berkeley National Laboratory), R. N. Cahn(Lawrence Berkeley National Laboratory), E. Charles(Lawrence Berkeley National Laboratory), M. S. Gill(Lawrence Berkeley National Laboratory), Y. Groysman(Lawrence Berkeley National Laboratory), R. G. Jacobsen(Lawrence Berkeley National Laboratory), J. A. Kadyk(Lawrence Berkeley National Laboratory), L. T. Kerth(Lawrence Berkeley National Laboratory), Yu. G. Kolomensky(Lawrence Berkeley National Laboratory), G. Kukartsev(Lawrence Berkeley National Laboratory), G. Lynch(Lawrence Berkeley National Laboratory), L. M. Mir(Lawrence Berkeley National Laboratory), T. Orimoto(Lawrence Berkeley National Laboratory), M. Pripstein(Lawrence Berkeley National Laboratory), N. A. Roe(Lawrence Berkeley National Laboratory), M. T. Ronan(Lawrence Berkeley National Laboratory), W. A. Wenzel(Lawrence Berkeley National Laboratory), P. del Amo Sanchez(University of Birmingham), M. Barrett(University of Birmingham), K. E. Ford(University of Birmingham), T. J. Harrison(University of Birmingham), A. John Hart(University of Birmingham), C. M. Hawkes(University of Birmingham), S. E. Morgan(University of Birmingham), A. T. Watson(University of Birmingham), T. Held(Ruhr University Bochum), H. Koch(Ruhr University Bochum), B. Lewandowski(Ruhr University Bochum), M. Pelizaeus(Ruhr University Bochum), Κ. Peters(Ruhr University Bochum), T. Vazquez Schroeder(Ruhr University Bochum), M. Steinke(Ruhr University Bochum), J. Boyd(University of Bristol), J. P. Burke(University of Bristol), W. N. Cottingham(University of Bristol), D. Walker(University of Bristol), T. Çuhadar-Dönszelmann(University of British Columbia), B. G. Fulsom(University of British Columbia), C. Hearty(University of British Columbia), N. S. Knecht(University of British Columbia), T. S. Mattison(University of British Columbia), J. A. McKenna(University of British Columbia), A. Khan(Brunel University of London), P. Kyberd(Brunel University of London), M. Saleem(Brunel University of London), D. J. Sherwood(Brunel University of London), L. Teodorescu(Brunel University of London), V.E. Blinov(Budker Institute of Nuclear Physics), A. D. Bukin(Budker Institute of Nuclear Physics), В. П. Дружинин(Budker Institute of Nuclear Physics), V. B. Golubev(Budker Institute of Nuclear Physics), A. P. Onuchin(Budker Institute of Nuclear Physics), S. I. Serednyakov(Budker Institute of Nuclear Physics), Yu. I. Skovpen(Budker Institute of Nuclear Physics), E. P. Solodov(Budker Institute of Nuclear Physics), K. Yu. Todyshev(Budker Institute of Nuclear Physics), D. S. Best(University of California, Irvine), M. Bondioli(University of California, Irvine), M. Bruinsma(University of California, Irvine), M. Chao(University of California, Irvine), S. Curry(University of California, Irvine), I. Eschrich(University of California, Irvine), D. Kirkby(University of California, Irvine), A. J. Lankford(University of California, Irvine), P. Lund(University of California, Irvine), M. Mandelkern(University of California, Irvine), R. K. Mommsen(University of California, Irvine), W. Roethel(University of California, Irvine), D. P. Stoker(University of California, Irvine), S. Abachi(University of California, Los Angeles), C. Buchanan(University of California, Los Angeles), S. D. Foulkes(University of California, Riverside), J. W. Gary(University of California, Riverside), O. R. Long(University of California, Riverside), B. C. Shen(University of California, Riverside), K. Wang(University of California, Riverside), L. Zhang(University of California, Riverside), H. K. Hadavand(University of California San Diego), E. J. Hill(University of California San Diego), H. P. Paar(University of California San Diego), S. Rahatlou(University of California San Diego), V. Sharma(University of California San Diego), J. W. Berryhill(University of California, Santa Barbara), C. Campagnari(University of California, Santa Barbara), A. Cunha(University of California, Santa Barbara), B. Dahmes(University of California, Santa Barbara), T. M. Hong(University of California, Santa Barbara), D. Kovalskyi(University of California, Santa Barbara), J. D. Richman(University of California, Santa Barbara), T. W. Beck(University of California, Santa Cruz), A. M. Eisner(University of California, Santa Cruz), C. J. Flacco(University of California, Santa Cruz), C. A. Heusch(University of California, Santa Cruz), J. Kroseberg(University of California, Santa Cruz), W. S. Lockman(University of California, Santa Cruz), G. Nesom(University of California, Santa Cruz), T. Schalk(University of California, Santa Cruz), B. A. Schumm(University of California, Santa Cruz), A. Seiden(University of California, Santa Cruz), P. Spradlin(University of California, Santa Cruz), D. C. Williams(University of California, Santa Cruz), M. G. Wilson(University of California, Santa Cruz), J. Albert(California Institute of Technology), E. Chen(California Institute of Technology), A. Dvoretskii(California Institute of Technology), F. Fang(California Institute of Technology), D. G. Hitlin(California Institute of Technology), I. Narsky(California Institute of Technology), T. Piatenko(California Institute of Technology), F. C. Porter(California Institute of Technology), A. Rýd(California Institute of Technology), A. Samuel(California Institute of Technology), G. Mancinelli(University of Cincinnati), B. T. Meadows(University of Cincinnati), K. Mishra(University of Cincinnati), M. D. Sokoloff(University of Cincinnati), F. Blanc(University of Colorado Boulder), P. C. Bloom(University of Colorado Boulder), S. Chen(University of Colorado Boulder), W. T. Ford(University of Colorado Boulder), J. F. Hirschauer(University of Colorado Boulder), A. Kreisel(University of Colorado Boulder), M. Nagel(University of Colorado Boulder), U. Nauenberg(University of Colorado Boulder), A. Olivas(University of Colorado Boulder), W. O. Ruddick(University of Colorado Boulder), J. G. Smith(University of Colorado Boulder), K. A. Ulmer(University of Colorado Boulder), S. R. Wagner(University of Colorado Boulder), J. Zhang(University of Colorado Boulder), A. Chen(Colorado State University), E. A. Eckhart(Colorado State University), A. Soffer(Colorado State University), W. H. Toki(Colorado State University), R. J. Wilson(Colorado State University), F. Winklmeier(Colorado State University), Q. Zeng(Colorado State University), D. D. Altenburg(TU Dortmund University), E. Feltresi(TU Dortmund University), A. Hauke(TU Dortmund University), H. Jasper(TU Dortmund University), A. Petzold(TU Dortmund University), B. Spaan(TU Dortmund University), T. Brandt(Technische Universität Dresden), V. Klose(Technische Universität Dresden), H. M. Lacker(Technische Universität Dresden), W. F. Mader(Technische Universität Dresden), R. Nogowski(Technische Universität Dresden), J. Schubert(Technische Universität Dresden), K. R. Schubert(Technische Universität Dresden), R. Schwierz(Technische Universität Dresden), J. E. Sundermann(Technische Universität Dresden), A. Volk(Technische Universität Dresden), D. Bernard(École Polytechnique), G. R. Bonneaud(École Polytechnique), P. Grenier(École Polytechnique), E. Latour(École Polytechnique), Ch. Thiebaux(École Polytechnique), M. Verderi(École Polytechnique), P. J. Clark(University of Edinburgh), W. Gradl(University of Edinburgh), F. Muheim(University of Edinburgh), S. Playfer(University of Edinburgh), A. I. Robertson(University of Edinburgh), Y. Xie(University of Edinburgh), M. Andreotti(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), D. Bettoni(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), C. Bozzi(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), R. Calabrese(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), G. Cibinetto(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), E. Luppi(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), M. Negrini(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), A. Petrella(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), L. Piemontese(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), E. Prencipe(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), F. Anulli(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), R. Baldini-Ferroli(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), A. Calcaterra(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), R. de Sangro(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), G. Finocchiaro(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), S. Pacetti(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), P. Patteri(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), I. M. Peruzzi(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), M. Piccolo(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), M. Rama(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), A. Zallo(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), A. Buzzo(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), R. Capra(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), R. Contri(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), M. Lo Vetere(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), M. Macrı́(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), M. R. Monge(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), S. Passaggio(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), C. Patrignani(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), E. Robutti(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), A. Santroni(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), S. Tosi(Istituto Nazionale di Fisica Nucleare, Sezione di Genova), G. Brandenburg(Harvard University Press), K. S. Chaisanguanthum(Harvard University Press), M. Morii(Harvard University Press), J. Wu(Harvard University Press), R. S. Dubitzky(Heidelberg University), J. Marks(Heidelberg University), S. Schenk(Heidelberg University), U. Uwer(Heidelberg University), D. J. Bard(Imperial College London), W. Bhimji(Imperial College London), D. A. Bowerman(Imperial College London), P. D. Dauncey(Imperial College London), U. Egede(Imperial College London), R. L. Flack(Imperial College London), J. Nash(Imperial College London), M. B. Nikolich(Imperial College London), J. G. Panduro Vazquez(Imperial College London), P. K. Behera(University of Iowa), X. Chai(University of Iowa), M. Charles(University of Iowa), U. Mallik(University of Iowa), N. T. Meyer(University of Iowa), V. Ziegler(University of Iowa), J. Cochran(Iowa State University), H. B. Crawley(Iowa State University), L. Y. Dong(Iowa State University), V. Eyges(Iowa State University), W. T. Meyer(Iowa State University), S. Prell(Iowa State University), E. I. Rosenberg(Iowa State University), A. E. Rubin(Iowa State University), A. V. Gritsan(Johns Hopkins University), A. G. Denig(Karlsruhe Institute of Technology), M. Fritsch(Karlsruhe Institute of Technology), G. Schott(Karlsruhe Institute of Technology), N. Arnaud(Université Paris-Sud), M. Davier(Université Paris-Sud), G. Grosdidier(Université Paris-Sud), A. Höcker(Université Paris-Sud), F. Le Diberder(Université Paris-Sud), V. Lepeltier(Université Paris-Sud), A. M. Lutz(Université Paris-Sud), A. Oyanguren(Université Paris-Sud), S. Pruvot(Université Paris-Sud), S. Rodier(Université Paris-Sud), P. Roudeau(Université Paris-Sud), M. H. Schune(Université Paris-Sud), A. Stocchi(Université Paris-Sud), W. F. Wang(Université Paris-Sud), G. Wormser(Université Paris-Sud), C. H. Cheng(Lawrence Livermore National Laboratory), D. J. Lange(Lawrence Livermore National Laboratory), D. Wright(Lawrence Livermore National Laboratory), C. A. Chavez(University of Liverpool), I. J. Forster(University of Liverpool), J. R. Fry(University of Liverpool), E. Gabathuler(University of Liverpool), R. Gamet(University of Liverpool), K. A. George(University of Liverpool), D. Hutchcroft(University of Liverpool), D. J. Payne(University of Liverpool), K. C. Schofield(University of Liverpool), C. Touramanis(University of Liverpool), A. J. Bevan(Queen Mary University of London), F. Di Lodovico(Queen Mary University of London), W. Menges(Queen Mary University of London), R. Sacco(Queen Mary University of London), G. Cowan(Royal Holloway University of London), H. U. Flaecher(Royal Holloway University of London), D. A. Hopkins(Royal Holloway University of London), P. S. Jackson(Royal Holloway University of London), T. R. McMahon(Royal Holloway University of London), S. Ricciardi(Royal Holloway University of London), F. Salvatore(Royal Holloway University of London), A. C. Wren(Royal Holloway University of London), David Norvil Brown(University of Louisville), C. L. Davis(University of Louisville), J. Allison(University of Manchester), N. Barlow(University of Manchester), R. J. Barlow(University of Manchester), Y. M. Chia(University of Manchester), C. L. Edgar(University of Manchester), G. Lafferty(University of Manchester), M. T. Naisbit(University of Manchester), J. C. Williams(University of Manchester), J. I. Yi(University of Manchester), C. Chen(University of Maryland, College Park), W. D. Hulsbergen(University of Maryland, College Park), A. Jawahery(University of Maryland, College Park), C. K. Lae(University of Maryland, College Park), D. A. Roberts(University of Maryland, College Park), G. Simi(University of Maryland, College Park), G. Blaylock(University of Massachusetts Amherst), C. Dallapiccola(University of Massachusetts Amherst), S. S. Hertzbach(University of Massachusetts Amherst), X. Li(University of Massachusetts Amherst), T. B. Moore(University of Massachusetts Amherst), S. Saremi(University of Massachusetts Amherst), H. Staengle(University of Massachusetts Amherst), R. Cowan(Massachusetts Institute of Technology), G. Sciolla(Massachusetts Institute of Technology), S. J. Sekula(Massachusetts Institute of Technology), M. Spitznagel(Massachusetts Institute of Technology), F. Taylor(Massachusetts Institute of Technology), R. K. Yamamoto(Massachusetts Institute of Technology), H. Kim(McGill University), S. E. Mclachlin(McGill University), P. M. Patel(McGill University), S. H. Robertson(McGill University), A. Lazzaro(Istituto Nazionale di Fisica Nucleare, Sezione di Milano), V. Lombardo(Istituto Nazionale di Fisica Nucleare, Sezione di Milano), F. Palombo(Istituto Nazionale di Fisica Nucleare, Sezione di Milano), J. M. Bauer(University of Mississippi), L. Cremaldi(University of Mississippi), V. Eschenburg(University of Mississippi), R. Godang(University of Mississippi), R. Kroeger(University of Mississippi), D. A. Sanders(University of Mississippi), D. J. Summers(University of Mississippi), H. W. Zhao(University of Mississippi), S. Brunet(Université de Montréal), D. Côté(Université de Montréal), M. Simard(Université de Montréal), P. Taras(Université de Montréal), F. B. Viaud(Université de Montréal), H. Nicholson(Mount Holyoke College), N. Cavallo(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), G. De Nardo(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), F. Fabozzi(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), C. Gatto(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), L. Lista(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), D. Monorchio(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), P. Paolucci(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), D. Piccolo(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), C. Sciacca(Istituto Nazionale di Fisica Nucleare, Sezione di Napoli), M. Baak(National Institute for Subatomic Physics), G. Raven(National Institute for Subatomic Physics), H. L. Snoek(National Institute for Subatomic Physics), C. P. Jessop(University of Notre Dame), J. M. LoSecco(University of Notre Dame), T. Allmendinger(The Ohio State University), G. Benelli(The Ohio State University), K. K. Gan(The Ohio State University), K. Honscheid(The Ohio State University), D. Hufnagel(The Ohio State University), P. Jackson(Royal Holloway University of London), H. Kagan(The Ohio State University), R. Kass(The Ohio State University), A. M. Rahimi(The Ohio State University), R. Ter-Antonyan(The Ohio State University), Q. K. Wong(The Ohio State University), N. L. Blount(University of Oregon), J. Brau(University of Oregon), R. Frey(University of Oregon), O. Igonkina(University of Oregon), M. Lu(University of Oregon), R. Rahmat(University of Oregon), N. B. Sinev(University of Oregon), D. Strom(University of Oregon), J. Strube(University of Oregon), E. Torrence(University of Oregon), A. Gaz(University of Padua), M. Margoni(University of Padua), M. Morandin(University of Padua), A. Pompili(University of Padua), M. Posocco(University of Padua), M. Rotondo(University of Padua), F. Simonetto(University of Padua), R. Stroili(University of Padua), C. Voci(University of Padua), M. Benayoun(Sorbonne Université), J. Chauveau(Sorbonne Université), H. Briand(Sorbonne Université), P. David(Sorbonne Université), L. Del Buono(Sorbonne Université), Ch. de la Vaissière(Sorbonne Université), O. Hamon(Sorbonne Université), B. L. Hartfiel(Sorbonne Université), M. John(Sorbonne Université), Ph. Leruste(Sorbonne Université), J. Malclès(Sorbonne Université), J. Ocariz(Sorbonne Université), L. Roos(Sorbonne Université), G. Thérin(Sorbonne Université), L. Gladney(University of Pennsylvania), J. Panetta(University of Pennsylvania), M. Biasini, R. Covarelli, C. Angelini(University of Pisa), G. Batignani(University of Pisa), S. Bettarini(University of Pisa), F. Bucci(University of Pisa), G. Calderini(University of Pisa), M. Carpinelli(University of Pisa), R. Cenci(University of Pisa), F. Forti(University of Pisa), M. A. Giorgi(University of Pisa), A. Lusiani(University of Pisa), G. Marchiori(University of Pisa), M. A. Mazur(University of Pisa), M. Morganti(University of Pisa), N. Néri(University of Pisa), G. Rizzo(University of Pisa), J. Walsh(University of Pisa), M. Haire(Prairie View A&M University), D. Judd(Prairie View A&M University), D. E. Wagoner(Prairie View A&M University), J. Biesiada(Princeton University), N. Danielson(Princeton University), P. Elmer(Princeton University), Y. P. Lau(Princeton University), C. Lü(Princeton University), J. Olsen(Princeton University), A. J. S. Smith(Princeton University), A. V. Telnov(Princeton University), F. Bellini, G. Cavoto, A. D’Orazio, D. Del Re, E. Di Marco, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, L. Li Gioi, M. A. Mazzoni, S. Morganti, G. Piredda, F. Polci, F. Safai Tehrani, C. Voena, M. Ebert(University of Rostock), H. Schröder(University of Rostock), R. Waldi(University of Rostock), T. Adye(Rutherford Appleton Laboratory), N. De Groot(Rutherford Appleton Laboratory), B. Franek(Rutherford Appleton Laboratory), E. O. Olaiya(Rutherford Appleton Laboratory), F. F. Wilson(Rutherford Appleton Laboratory), R. Aleksan(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), S. Emery(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), A. Gaidot(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), S. F. Ganzhur(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), G. Hamel de Monchenault(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), W. Kozanecki(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), M. Legendre(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), G. Vasseur(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), Ch. Yèche(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), M. Zito(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), X. R. Chen(University of Wisconsin–Madison), H. Liu(University of South Carolina), Woosung Park(University of South Carolina), M. V. Purohit(University of South Carolina), R. J. Wilson(University of South Carolina), M. T. Allen(SLAC National Accelerator Laboratory), D. Aston(SLAC National Accelerator Laboratory), R. Bartoldus(SLAC National Accelerator Laboratory), P. Bechtle(SLAC National Accelerator Laboratory), N. Berger(SLAC National Accelerator Laboratory), R. Claus(SLAC National Accelerator Laboratory), J. P. Coleman(SLAC National Accelerator Laboratory), M. R. Convery(SLAC National Accelerator Laboratory), M. Cristinziani(SLAC National Accelerator Laboratory), J. Dingfelder(SLAC National Accelerator Laboratory), J. Dorfan(SLAC National Accelerator Laboratory), G. P. Dubois-Felsmann(SLAC National Accelerator Laboratory), D. Dujmić(SLAC National Accelerator Laboratory), W. Dunwoodie(SLAC National Accelerator Laboratory), R. C. Field(SLAC National Accelerator Laboratory), T. Glanzman(SLAC National Accelerator Laboratory), S. J. Gowdy(SLAC National Accelerator Laboratory), M. T. Graham(SLAC National Accelerator Laboratory), V. Halyo(SLAC National Accelerator Laboratory), C. Hast(SLAC National Accelerator Laboratory), T. Hryn’ova(SLAC National Accelerator Laboratory), W. R. Innes(SLAC National Accelerator Laboratory), M.H. Kelsey(SLAC National Accelerator Laboratory), P. Kim(SLAC National Accelerator Laboratory), D. W. G. S. Leith(SLAC National Accelerator Laboratory), S. Li(SLAC National Accelerator Laboratory), S. Luitz(SLAC National Accelerator Laboratory), V. Lüth(SLAC National Accelerator Laboratory), H. L. Lynch(SLAC National Accelerator Laboratory), D. B. MacFarlane(SLAC National Accelerator Laboratory), H. Marsiske(SLAC National Accelerator Laboratory), R. Messner(SLAC National Accelerator Laboratory), D. R. Müller(SLAC National Accelerator Laboratory), C. P. O’Grady(SLAC National Accelerator Laboratory), V. E. Ozcan(SLAC National Accelerator Laboratory), A. Perazzo(SLAC National Accelerator Laboratory), M. Perl(SLAC National Accelerator Laboratory), T. Pulliam(SLAC National Accelerator Laboratory), B. N. Ratcliff(SLAC National Accelerator Laboratory), A. Roodman(SLAC National Accelerator Laboratory), A. A. Salnikov(SLAC National Accelerator Laboratory), R. H. Schindler(SLAC National Accelerator Laboratory), J. Schwiening(SLAC National Accelerator Laboratory), A. Snyder(SLAC National Accelerator Laboratory), J. Stelzer(SLAC National Accelerator Laboratory), D. Su(SLAC National Accelerator Laboratory), M. K. Sullivan(SLAC National Accelerator Laboratory), K. Suzuki(SLAC National Accelerator Laboratory), S. K. Swain(SLAC National Accelerator Laboratory), J. M. Thompson(SLAC National Accelerator Laboratory), J. Va’vra(SLAC National Accelerator Laboratory), N. van Bakel(SLAC National Accelerator Laboratory), M. Weaver(SLAC National Accelerator Laboratory), A. J. Weinstein(SLAC National Accelerator Laboratory), W. J. Wisniewski(SLAC National Accelerator Laboratory), M. Wittgen(SLAC National Accelerator Laboratory), D. H. Wright(Lawrence Livermore National Laboratory), A. K. Yarritu(SLAC National Accelerator Laboratory), K. Yi(SLAC National Accelerator Laboratory), C. C. Young(SLAC National Accelerator Laboratory), P. R. Burchat(Stanford University), A. J. Edwards(Stanford University), S. Majewski(Stanford University), B. A. Petersen(Stanford University), C. Roat(Stanford University), L. Wilden(Stanford University), S. Ahmed(Albany State University), M. S. Alam(Albany State University), R. Bula(Albany State University), J. Ernst(Albany State University), V. Jain(Albany State University), B. Pan(Albany State University), M. A. Saeed(Albany State University), F. Wappler(Albany State University), S. B. Zain(Albany State University), W. Bugg(University of Tennessee at Knoxville), M. Krishnamurthy(University of Tennessee at Knoxville), S. Spanier(University of Tennessee at Knoxville), R. Eckmann(The University of Texas at Austin), J. L. Ritchie(The University of Texas at Austin), A. Satpathy(The University of Texas at Austin), C. J. Schilling(The University of Texas at Austin), R. F. Schwitters(The University of Texas at Austin), J. M. Izen(The University of Texas at Dallas), X. C. Lou(The University of Texas at Dallas), S. Ye(The University of Texas at Dallas), F. Bianchi(Istituto Nazionale di Fisica Nucleare, Sezione di Torino), F. Gallo(Istituto Nazionale di Fisica Nucleare, Sezione di Torino), D. Gamba(Istituto Nazionale di Fisica Nucleare, Sezione di Torino), M. Bomben(University of Trieste), L. Bosisio(University of Trieste), C. Cartaro(University of Trieste), F. Cossutti(University of Trieste), G. Della Ricca(University of Trieste), S. Dittongo(University of Trieste), L. Lanceri(University of Trieste), L. Vitale(University of Trieste), V. Azzolini(Universitat de València), F. Martínez-Vidal(Universitat de València), Sw. Banerjee(University of Victoria), B. Bhuyan(University of Victoria), C. M. Brown(University of Victoria), D. Fortin(University of Victoria), K. Hamano(University of Victoria), R. Kowalewski(University of Victoria), I. M. Nugent(University of Victoria), J. M. Roney(University of Victoria), R. Sobie(University of Victoria), J. J. Back(University of Warwick), P. F. Harrison(University of Warwick), T. Latham(University of Warwick), G. B. Mohanty(University of Warwick), M. Pappagallo(University of Warwick), H. R. Band(University of Wisconsin–Madison), X. Chen(University of Wisconsin–Madison), B. Cheng(University of Wisconsin–Madison), S. Dasu(University of Wisconsin–Madison), M. Datta(University of Wisconsin–Madison), K. T. Flood(University of Wisconsin–Madison), J. J. Hollar(University of Wisconsin–Madison), P. E. Kutter(University of Wisconsin–Madison), B. Mellado(University of Wisconsin–Madison), A. Mihályi(University of Wisconsin–Madison), Y. Pan(University of Wisconsin–Madison), M. Pierini(University of Wisconsin–Madison), R. Prepost(University of Wisconsin–Madison), S. L. Wu(University of Wisconsin–Madison), Z. Yu(University of Wisconsin–Madison), H. Neal(Yale University)
Cited by 291Open Access
Abstract
We present a measurement of the cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\psi}(2S)$ from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the SLAC PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ storage rings. The study is based on $298\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data recorded with the BABAR detector. A structure is observed in the cross section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the $Y(4260)$ previously reported by this experiment.
Related Papers
No related papers found
Powered by citation graph analysis