Searches for Lepton Flavor Violation in the Decays<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>τ</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>τ</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math>

B. Aubert(Centre National de la Recherche Scientifique), Y. Karyotakis(Université Savoie Mont Blanc), J. P. Lees(Université Savoie Mont Blanc), V. Poireau(Université Savoie Mont Blanc), E. Prencipe(Université Savoie Mont Blanc), X. Prudent(Université Savoie Mont Blanc), V. Tisserand(Université Savoie Mont Blanc), J. Garra Ticó(Universitat de Barcelona), E. Graugés(Universitat de Barcelona), M. Martinelli(University of Bari Aldo Moro), A. Palano(University of Bari Aldo Moro), M. Pappagallo(University of Bari Aldo Moro), G. Eigen(University of Bergen), B. Stugu(University of Bergen), L. Sun(University of Bergen), M. Battaglia(University of California, Berkeley), D. N. Brown(University of California, Berkeley), B. H. Hooberman(University of California, Berkeley), L. T. Kerth(University of California, Berkeley), Yu. G. Kolomensky(University of California, Berkeley), G. Lynch(University of California, Berkeley), I. L. Osipenkov(University of California, Berkeley), K. Tackmann(University of California, Berkeley), T. Tanabe(University of California, Berkeley), C. M. Hawkes(University of Birmingham), N. Soni(University of Birmingham), A. T. Watson(University of Birmingham), H. Koch(Ruhr University Bochum), T. Vazquez Schroeder(Ruhr University Bochum), D. J. Asgeirsson(University of British Columbia), C. Hearty(University of British Columbia), T. S. Mattison(University of British Columbia), J. A. McKenna(University of British Columbia), M. Barrett(Brunel University of London), A. Khan(Brunel University of London), A. Randle-Conde(Brunel University of London), V. E. Blinov(Budker Institute of Nuclear Physics), A. D. Bukin(Budker Institute of Nuclear Physics), А. Р. Бузыкаев(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), M. Bondioli(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), E. C. Martin(University of California, Irvine), D. P. Stoker(University of California, Irvine), H. Atmacan(University of California, Riverside), J. W. Gary(University of California, Riverside), F. Liu(University of California, Riverside), O. Long(University of California, Riverside), G. M. Vitug(University of California, Riverside), Z. Yasin(University of California, Riverside), V. Sharma(University of California San Diego), C. Campagnari(University of California, Santa Barbara), T. M. Hong(University of California, Santa Barbara), D. Kovalskyi(University of California, Santa Barbara), M. A. Mazur(University of California, Santa Barbara), J. Richman(University of California, Santa Cruz), T. W. Beck(University of California, Santa Cruz), A. M. Eisner(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), A. J. Martínez(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), L. Wang(University of California, Santa Cruz), L. O. Winstrom(University of California, Santa Cruz), C. H. Cheng(California Institute of Technology), D. A. Doll(California Institute of Technology), B. Echenard(California Institute of Technology), F. Fang(California Institute of Technology), D. G. Hitlin(California Institute of Technology), I. Narsky(California Institute of Technology), P. Ongmongkolkul(California Institute of Technology), T. Piatenko(California Institute of Technology), F. C. Porter(California Institute of Technology), R. Andreassen(University of Cincinnati), G. Mancinelli(University of Cincinnati), B. T. Meadows(University of Cincinnati), K. Mishra(University of Cincinnati), M. D. Sokoloff(University of Cincinnati), P. C. Bloom(University of Colorado Boulder), W. T. Ford(University of Colorado Boulder), A. Gaz(University of Colorado Boulder), J. F. Hirschauer(University of Colorado Boulder), M. Nagel(University of Colorado Boulder), U. Nauenberg(University of Colorado Boulder), J. G. Smith(University of Colorado Boulder), S. R. Wagner(University of Colorado Boulder), R. Ayad(Temple University), W. H. Toki(Colorado State University), E. Feltresi(TU Dortmund University), A. Hauke(TU Dortmund University), H. Jasper(TU Dortmund University), T. M. Karbach(TU Dortmund University), J. Merkel(TU Dortmund University), A. Petzold(TU Dortmund University), B. Spaan(TU Dortmund University), K. Wacker(TU Dortmund University), M. J. Kobel(Technische Universität Dresden), R. Nogowski(Technische Universität Dresden), K. R. Schubert(Technische Universität Dresden), R. Schwierz(Technische Universität Dresden), D. Bernard(École Polytechnique), E. Latour(École Polytechnique), M. Verderi(École Polytechnique), P. J. Clark(University of Edinburgh), S. Playfer(University of Edinburgh), J. E. Watson(University of Edinburgh), M. Andreotti(University of Ferrara), D. Bettoni, C. Bozzi, R. Calabrese(University of Ferrara), A. Cecchi(University of Ferrara), G. Cibinetto(University of Ferrara), E. Fioravanti(University of Ferrara), P. Franchini(University of Ferrara), E. Luppi(University of Ferrara), M. Munerato(University of Ferrara), M. Negrini(University of Ferrara), A. Petrella(University of Ferrara), L. Piemontese, V. Santoro(University of Ferrara), R. Baldini-Ferroli, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Pacetti, P. Patteri, I. M. Peruzzi(University of Perugia), M. Piccolo, M. Rama, A. Zallo, R. Contri(University of Genoa), E. Guido(University of Genoa), M. Lo Vetere(University of Genoa), M. R. Monge(University of Genoa), S. Passaggio, C. Patrignani(University of Genoa), E. Robutti, S. Tosi(University of Genoa), M. Morii(Harvard University Press), A. Adametz(Heidelberg University), J. Marks(Heidelberg University), S. Schenk(Heidelberg University), U. Uwer(Heidelberg University), F. U. Bernlochner(Humboldt-Universität zu Berlin), H. M. Lacker(Humboldt-Universität zu Berlin), T. Lueck(Humboldt-Universität zu Berlin), A. Volk(Humboldt-Universität zu Berlin), P. D. Dauncey(Imperial College London), M. J. Tibbetts(Imperial College London), P. K. Behera(University of Iowa), M. Charles(Iowa State University), U. Mallik(Iowa State University), 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), Y. Y. Gao(Johns Hopkins University), A. V. Gritsan(Johns Hopkins University), Z. J. Guo(Johns Hopkins University), N. Arnaud(Université Paris-Sud), A. D’Orazio(Université Paris-Sud), M. Davier(Université Paris-Sud), Д. Деркач(Université Paris-Sud), J. Firmino da Costa(Université Paris-Sud), G. Grosdidier(Université Paris-Sud), F. Le Diberder(Université Paris-Sud), V. Lepeltier(Université Paris-Sud), A. M. Lutz(Université Paris-Sud), B. Malaescu(Université Paris-Sud), P. Roudeau(Université Paris-Sud), M. H. Schune(Université Paris-Sud), J. Serrano(Université Paris-Sud), V. Sordini(Sapienza University of Rome), A. Stocchi(Université Paris-Sud), G. Wormser(Université Paris-Sud), D. J. Lange(Lawrence Livermore National Laboratory), D. Wright(Lawrence Livermore National Laboratory), I. Bingham(University of Liverpool), J. P. Burke(University of Liverpool), C. A. Chavez(University of Liverpool), J. R. Fry(University of Liverpool), E. Gabathuler(University of Liverpool), R. Gamet(University of Liverpool), D. Hutchcroft(University of Liverpool), D. J. Payne(University of Liverpool), C. Touramanis(University of Liverpool), A. J. Bevan(Queen Mary University of London), C. Clarke(Queen Mary University of London), F. Di Lodovico(Queen Mary University of London), R. Sacco(Queen Mary University of London), M. Sigamani(Queen Mary University of London), G. Cowan(Royal Holloway University of London), S. Paramesvaran(Royal Holloway University of London), A. C. Wren(Royal Holloway University of London), D. N. Brown(University of California, Berkeley), C. L. Davis(University of Louisville Hospital), A. G. Denig(Johannes Gutenberg University Mainz), M. Fritsch(Johannes Gutenberg University Mainz), W. Gradl(Johannes Gutenberg University Mainz), A. Hafner(Johannes Gutenberg University Mainz), K. E. Alwyn(University of Manchester), D. Bailey(University of Manchester), R. J. Barlow(University of Manchester), P. Jackson(University of Manchester), G. Lafferty(University of Manchester), T. J. West(University of Manchester), J. I. Yi(University of Manchester), J. Anderson(University of Maryland, College Park), C. Chen(University of Maryland, College Park), A. Jawahery(University of Maryland, College Park), D. A. Roberts(University of Maryland, College Park), G. Simi(University of Maryland, College Park), J. M. Tuggle(University of Maryland, College Park), C. Dallapiccola(University of Massachusetts Amherst), E. Salvati(University of Massachusetts Amherst), R. Cowan(Massachusetts Institute of Technology), D. Dujmić(Massachusetts Institute of Technology), P.H. Fisher(Massachusetts Institute of Technology), S. Henderson(Massachusetts Institute of Technology), G. Sciolla(Massachusetts Institute of Technology), M. Spitznagel(Massachusetts Institute of Technology), R. K. Yamamoto(Massachusetts Institute of Technology), M. G. Zhao(Massachusetts Institute of Technology), P. M. Patel(McGill University), S. H. Robertson(McGill University), M. Schram(McGill University), P. Biassoni(University of Milan), A. Lazzaro(University of Milan), V. Lombardo, F. Palombo(University of Milan), S. Stracka(University of Milan), L. Cremaldi(University of Mississippi), R. Godang(University of South Alabama), R. Kroeger(University of Mississippi), P. Sonnek(University of Mississippi), D. J. Summers(University of Mississippi), H. W. Zhao(University of Mississippi), X. Nguyen(Université de Montréal), M. Simard(Université de Montréal), P. Taras(Université de Montréal), H. Nicholson(Mount Holyoke College), G. De Nardo(University of Naples Federico II), L. Lista, D. Monorchio(University of Naples Federico II), G. Onorato(University of Naples Federico II), C. Sciacca(University of Naples Federico II), G. Raven, H. L. Snoek, C. P. Jessop(University of Notre Dame), K. J. Knoepfel(University of Notre Dame), J. M. LoSecco(University of Notre Dame), W. F. Wang(University of Notre Dame), L. A. Corwin(The Ohio State University), K. Honscheid(The Ohio State University), H. Kagan(The Ohio State University), R. Kass(The Ohio State University), J. P. Morris(The Ohio State University), A. M. Rahimi(The Ohio State University), S. J. Sekula(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), J. Kolb(University of Oregon), Ming‐Hui 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), G. Castelli(University of Padua), N. Gagliardi(University of Padua), M. Margoni(University of Padua), M. Morandin, M. Posocco, M. Rotondo, F. Simonetto(University of Padua), R. Stroili(University of Padua), C. Voci(University of Padua), P. del Amo Sanchez(Université Paris Cité), E. Ben-Haim(Université Paris Cité), G. R. Bonneaud(Université Paris Cité), H. Briand(Université Paris Cité), J. Chauveau(Université Paris Cité), O. Hamon(Université Paris Cité), Ph. Leruste(Université Paris Cité), G. Marchiori(Université Paris Cité), J. Ocariz(Université Paris Cité), A. Pérez(Université Paris Cité), J. Prendki(Université Paris Cité), S. Sitt(Université Paris Cité), L. Gladney(University of Pennsylvania), M. Biasini(University of Perugia), E. Manoni(University of Perugia), C. Angelini(University of Pisa), G. Batignani(University of Pisa), S. Bettarini(University of Pisa), G. Calderini(University of Pisa), M. Carpinelli(University of Sassari), A. Cervelli(University of Pisa), F. Forti(University of Pisa), M. A. Giorgi(University of Pisa), A. Lusiani(Scuola Normale Superiore), M. Morganti(University of Pisa), N. Néri(University of Pisa), E. Paoloni(University of Pisa), G. Rizzo(University of Pisa), J. Walsh, D. Lopes Pegna(Princeton University), C. Lu(Princeton University), J. Olsen(Princeton University), A. J. S. Smith(Princeton University), A. V. Telnov(Princeton University), F. Anulli, E. Baracchini(University of Rostock), G. Cavoto(Sapienza University of Rome), R. Faccini(University of Rostock), F. Ferrarotto(Sapienza University of Rome), F. Ferroni(University of Rostock), M. Gaspero(University of Rostock), P. Jackson(Sapienza University of Rome), L. Li Gioi(Sapienza University of Rome), M. A. Mazzoni(Sapienza University of Rome), S. Morganti(Sapienza University of Rome), G. Piredda(Sapienza University of Rome), F. Renga(University of Rostock), C. Voena(Sapienza University of Rome), M. Ebert(Rutherford Appleton Laboratory), T. Hartmann(Rutherford Appleton Laboratory), H. Schröder(Rutherford Appleton Laboratory), R. Waldi(Rutherford Appleton Laboratory), T. Adye, B. Franek, E. O. Olaiya, F. F. Wilson, S. Emery(Stanford University), L. Esteve(Stanford University), G. Hamel de Monchenault(Stanford University), W. Kozanecki(Stanford University), G. Vasseur(Stanford University), Ch. Yèche(Stanford University), M. Zito(Stanford University), M. T. Allen(University of South Carolina), D. Aston(University of South Carolina), D. J. Bard(University of South Carolina), R. Bartoldus(University of South Carolina), J. F. Benitez(University of South Carolina), R. Cenci(University of South Carolina), J. P. Coleman(University of South Carolina), M. R. Convery(University of South Carolina), J. Dingfelder(University of South Carolina), J. Dorfan(University of South Carolina), G. P. Dubois-Felsmann(University of South Carolina), W. Dunwoodie(University of South Carolina), R. C. Field(University of South Carolina), M. Franco Sevilla(University of South Carolina), B. G. Fulsom(University of South Carolina), A. M. Gabareen(University of South Carolina), M. T. Graham(University of South Carolina), P. Grenier(University of South Carolina), C. Hast(University of South Carolina), W. R. Innes(University of South Carolina), J. Kamiński(University of South Carolina), M. H. Kelsey(University of South Carolina), H. Kim(University of South Carolina), P. Kim(University of South Carolina), M. L. Kocian(University of South Carolina), D. W. G. S. Leith(University of South Carolina), S. Li(University of South Carolina), B. Lindquist(University of South Carolina), S. Luitz(University of South Carolina), V. Lüth(University of South Carolina), H. L. Lynch(University of South Carolina), D. B. MacFarlane(University of South Carolina), H. Marsiske(University of South Carolina), R. Messner(University of South Carolina), D. R. Müller(University of South Carolina), H. Neal(University of South Carolina), S. Nelson(University of South Carolina), C. P. O’Grady(University of South Carolina), I. Ofte(University of South Carolina), M. Perl(University of South Carolina), B. N. Ratcliff(University of South Carolina), A. Roodman(University of South Carolina), A. A. Salnikov(University of South Carolina), R. H. Schindler(University of South Carolina), J. Schwiening(University of South Carolina), A. Snyder(University of South Carolina), D. Su(University of South Carolina), M. K. Sullivan(University of South Carolina), K. Suzuki(University of South Carolina), S. K. Swain(University of South Carolina), J. M. Thompson(University of South Carolina), J. Va’vra(University of South Carolina), A. P. Wagner(University of South Carolina), M. Weaver(University of South Carolina), Christopher West(University of South Carolina), W. J. Wisniewski(University of South Carolina), M. Wittgen(University of South Carolina), D. H. Wright(University of South Carolina), H. W. Wulsin(University of South Carolina), A. K. Yarritu(University of South Carolina), C. C. Young(University of South Carolina), V. Ziegler(University of South Carolina), X. R. Chen(Stanford University), H. Liu(Stanford University), W Park(Stanford University), M. V. Purohit(Stanford University), R. M. White(Stanford University), J. R. Wilson(Stanford University), M. Bellis(University at Albany, State University of New York), P. R. Burchat(University at Albany, State University of New York), A. J. Edwards(University at Albany, State University of New York), T. S. Miyashita(University at Albany, State University of New York), S. Ahmed(Tel Aviv University), M. S. Alam(Tel Aviv University), J. Ernst(Tel Aviv University), B. Pan(Tel Aviv University), M. A. Saeed(Tel Aviv University), S. B. Zain(Tel Aviv University), A. Soffer(University of Tennessee at Knoxville), S. M. Spanier(The University of Texas at Austin), B. J. Wogsland(The University of Texas at Austin), R. Eckmann(The University of Texas at Dallas), J. L. Ritchie(The University of Texas at Dallas), A. M. Ruland(The University of Texas at Dallas), C. J. Schilling(The University of Texas at Dallas), R. F. Schwitters(The University of Texas at Dallas), B. C. Wray(The University of Texas at Dallas), B. W. Drummond(The University of Texas at Dallas), J. M. Izen(The University of Texas at Dallas), X. C. Lou(The University of Texas at Dallas), F. Bianchi(University of Turin), D. Gamba(University of Turin), M. Pelliccioni(University of Turin), M. Bomben(University of Trieste), L. Bosisio(University of Trieste), C. Cartaro(University of Trieste), G. Della Ricca(University of Trieste), L. Lanceri(University of Trieste), L. Vitale(University of Trieste), V. Azzolini(Universitat de València), N. López-March(Universitat de València), F. Martínez-Vidal(Universitat de València), D. A. Milanés(Universitat de València), A. Oyanguren(Universitat de València), J. Albert(University of Victoria), Sw. Banerjee(University of Victoria), B. Bhuyan(University of Victoria), H. H. F. Choi(University of Victoria), K. Hamano(University of Victoria), G. J. King(University of Victoria), R. Kowalewski(University of Victoria), M. J. Lewczuk(University of Victoria), C. D. Lindsay(University of Victoria), C. B. Locke(University of Victoria), I. M. Nugent(University of Victoria), J. M. Roney(University of Victoria), R. Sobie(University of Victoria), T. J. Gershon(University of Warwick), P. F. Harrison(University of Warwick), J. Ilić(University of Warwick), T. Latham(University of Warwick), G. B. Mohanty(University of Warwick), E. M. T. Puccio(University of Warwick), H. R. Band(University of Wisconsin–Madison), X Chen(University of Wisconsin–Madison), S. Dasu(University of Wisconsin–Madison), K. T. Flood(University of Wisconsin–Madison), Y. Pan(University of Wisconsin–Madison), R. Prepost(University of Wisconsin–Madison), C. Vuosalo(University of Wisconsin–Madison), S. L. Wu(University of Wisconsin–Madison)
Physical Review Letters
January 14, 2010
10.1103/physrevlett.104.021802
Cited by 639Open Access
Full Text

Abstract

Searches for lepton-flavor-violating decays of a $\ensuremath{\tau}$ lepton to a lighter mass lepton and a photon have been performed with the entire data set of $(963\ifmmode\pm\else\textpm\fi{}7)\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }\ensuremath{\tau}$ decays collected by the BABAR detector near the $\ensuremath{\Upsilon}(4S)$, $\ensuremath{\Upsilon}(3S)$ and $\ensuremath{\Upsilon}(2S)$ resonances. The searches yield no evidence of signals and we set upper limits on the branching fractions of $\mathcal{B}({\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{e}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\gamma})&lt;3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ and $\mathcal{B}({\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\gamma})&lt;4.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ at 90% confidence level.

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