Observation of a broad structure in the pi+ pi- J/psi mass spectrum around 4.26 GeV/c2.

@article{Aubert2005ObservationOA,
  title={Observation of a broad structure in the pi+ pi- J/psi mass spectrum around 4.26 GeV/c2.},
  author={Bernard Aubert and Renaud Barate and D. Boutigny and fabrice. couderc and Yannis Karyotakis and J. P. Lees and Vincent Poireau and Vincent Tisserand and A. Zghiche and Eugeni Grauges and Antimo Palano and M. Pappagallo and Alexis Pompili and Jiang-chai Chen and N. D. Qi and Genlan Rong and Peijie Wang and Y. S. Zhu and Gerald Eigen and Ingrid Ofte and Bjarne Stugu and Gordan Abrams and Marco Battaglia and A. B. Breon and David Norvil Brown and J. Button-Shafer and Robert Cahn and Eric Charles and C. T. Day and Mandeep Singh Gill and Andrei V. Gritsan and Y. Groysman and Robert G. Jacobsen and Rohini Kadel and John A. Kadyk and L. T. Kerth and Yu G Kolomensky and G. A. Kukartsev and Guy Lynch and Ll. M. Mir and Piermaria Oddone and Toyoko Jennifer Orimoto and M. Pripstein and Natalie A. Roe and Michael T. Ronan and Werner Wenzel and Martin Barrett and K. E. Saavik Ford and Tracey J Harrison and A. John Hart and Christopher Hawkes and Sarah E. Morgan and A. Ted Watson and Michael Fritsch and Klaus Goetzen and Thomas Held and Hans Koch and Bartosz Lewandowski and M. Pelizaeus and Kriszti{\'a}n Peters and Thomas P Schr{\"o}der and Michael Steinke and Jonathan T. Boyd and James Patrick Burke and Nicolas Chevalier and W. N. Cottingham and T. Cuhadar-Donszelmann and Bryan G. Fulsom and Conor Hearty and N. Knecht and T. S. Mattison and J A Mckenna and Arshad Khan and Paul Kyberd and Muhammad Furqan Saleem and Liliana Teodorescu and Alexey Blinov and Veniamin Blinov and A. V. Bozhenok A. D. Bukin D. A. Bukin and V. P. Druzhinin and Vladimir B. Golubev and Evgeniya Kravchenko and Alexander Onuchin and Sergei I. Serednyakov and Yu I Skovpen and Evgeny Solodov and A. N. Yushkov and Darrell S. Best and Mariasole Bondioli and Marjon Bruinsma and M. Chao and ShannonM. Curry and I. Gough Eschrich and David Kirkby and A. J. Lankford and Peter Lund and Mark Mandelkern and R. K. Mommsen and Willi Roethel and David Stoker and Chuck Buchanan and Bernadette Hartfiel and A. J. R. Weinstein and Steve Foulkes and James Gary and Owen Long and B. C. Shen and Kefeng Wang and Lili Zhang and Debora Del Re and Haleh Hadavand and E. June Hill and D B Macfarlane and Hans P. Paar and Sh Rahatlou and Vandana Sharma and Joseph Berryhill and Claudio Campagnari and Angelo B N Cunha and B. Dahmes and Tan Mui Hong and Miłosz A. Mazur and Jeffrey D. Richman and Wouter Verkerke and Travis W. Beck and A. M. Eisner and Christian J Flacco and Clemens Ai Heusch and J{\"u}rgen Kroseberg and W. S. Lockman and Gavin Nesom and Terry Schalk and Bruce Andrew Schumm and Abraham Seiden and P. Spradlin and David Clive Williams and M. A. Whalley G. W. Wilson and J-N. Albert and Ercai Chen and Gregory P. Dubois-Felsmann and A A Dvoretskiĭ and David G. Hitlin and Ilya Narsky and T. Piatenko and Frank C. Porter and Anders Ryd and A. Samuel and Rune Andreassen and Shalinka Jayatilleke and Giampiero Mancinelli and Brian T. Meadows and Michael D. Sokoloff and François-Xavier Blanc and P. C. Bloom and Songbi Chen and William Ford and James F. Hirschauer and Andreas Kreisel and Uriel Nauenberg and Alex Olivas and Peter C. Rankin and William Ruddick and James G. Smith and K. A. Ulmer and Stephen R. Wagner and J. Zhang and Anbo Chen and E. A. Eckhart and Abner Soffer and Walter H. Toki and R. J. Wilson and Qing Lin Zeng and D. D. Altenburg and E. Feltresi and A Hauke and Bernhard Spaan and Th. Brandt and Jens Brose and M. Dickopp and Vanessa Klose and H. Lacker and R. Nogowski and Siegfried Otto and A. Petzold and G{\"u}nter Schott and Josef Schubert and Kristina Schubert and R. Schwierz and J. E. Sundermann and Denis Bernard and G. R. Bonneaud and Philippe A. Grenier and Sandra Schrenk and Ch Thiebaux and G. Vasileiadis and Marc Verderi and Deborah Bard and Peter J. Clark and Wolfgang Gradl and Franz Muheim and Stephen Playfer and Y. N. Xie and Mirco Andreotti and V. Azzolini and Daniela Bettoni and C. Bozzi and Roberto Calabrese and Gianluigi Cibinetto and Eleonora Luppi and Matteo Negrini and Luigi Piemontese and F. Anulli and R. Baldini-Ferroli and Andrea Calcaterra and R. de Sangro and Giuseppe Finocchiaro and Pierpaolo Patteri and Isabella Peruzzi and Mauro Piccolo and Adriano Zallo and Armando Buzzo and Robert G. Capra and Rachele Contri and M. Lo Vetere and Matheus Martin Macri and Miriam Monge and Stefano Passaggio and C. Patrignani and Enrico Robutti and A. Santroni and Simone Tosi and G. W. Brandenburg and Kris S. Chaisanguanthum and Mikio Morii and E. Won and Jia-jun Wu and R. S. Dubitzky and Urs Langenegger and J{\"o}rg Marks and Stefan Schenk and U. Uwer and Wahid Bhimji and Deborah Bowerman and P. D. Dauncey and Ulrik Egede and Robert Flack and J. R. Gaillard and G. W. Morton and James A. Nash and M. B. Nikolich and G. P. Taylor and W. Panduro Vazquez and Moreau Jean Charles and Wolfgang Mader and Usha Mallik and Animesh K. Mohapatra and Johnnie Cochran and H. Bert Crawley and Vitaly E. Eyges and W. T. Meyer and S{\"o}ren Prell and E. I. Rosenberg and Alan E. Rubin and Jun Yi and Nicolas Arnaud and M. Davier and Xavier Giroux and Gilbert Grosdidier and Andreas Hoecker and F. Le Diberder and Vincent Lepeltier and Avery M. Lutz and Arantza Oyanguren and Troels C. Petersen and Maurizio Pierini and St{\'e}phane Plaszczynski and Sharon Rodier and Patrick Roudeau and M. H. Schune and Achille Stocchi and Guy Wormser and C.-H. Him Cheng and David J. Lange and M. C. Simani and David M Wright and A. J. Bevan and Carlos A. Ch{\'a}vez and Ian J. Forster and John R. Fry and Erwin Gabathuler and R. Gamet and Karina A George and D. Hutchcroft and Ronald J Parry and David J Payne and K. C. Schofield and C. Touramanis and Christopher M. Cormack and Francesca Di Lodovico and Wolfgang Menges and Ralph Sacco and Christopher L. Brown and Greig Cowan and Henning Flaecher and Matthew G. Green and David A. Hopkins and P. Suzanne Jackson and T R Mcmahon and S T Ricciardi and F T Salvatore and C. L. Davis and Julius Allison and Nichola Barlow and Rebecca Jo Barlow and C. L. Edgar and M. C. Hodgkinson and M. P. Kelly and George Lafferty and Mitchell Naisbit and Jarrod C Williams and Chien-Hung Chen and Wouter Hulsbergen and Abolhassan Jawahery and D. Kovalskyi and C. K. Lae and Douglas A Roberts and Goran {\vS}imi and G. T. Blaylock and C. Dallapiccola and S. S. Hertzbach and Robert Kofler and Ventzislav Koptchev and Xiang Shu Li and Thomas B. Moore and Sahar Saremi and Hermann Staengle and S. Y. Willocq and R. Cowan and Karsten K{\"o}neke and G. Sciolla and Stephen J. Sekula and Mary Beth Spitznagel and Fred W. Taylor and Ricardo Kazuito Yamamoto and H. Kim and Professor Manish Patel and Struan Robertson and Alfio Lazzaro and Vincenzo Lombardo and Fernando F. Palombo and James M. Bauer and L. Cremaldi and Vance Eschenburg and R. Godang and Roland Kr{\"o}ger and John Reidy and Duncan A Sanders and D. J. Summers and Ha-Lin Zhao and Suzanne Brunet and Delphine C{\^o}te and Paul Taras and B F Viaud and Helen Nicholson and Noemi Cavallo and G. De Nardo and Francesco Fabozzi and Craig Gatto and Luca Lista and D. Monorchio and Pierluigi Paolucci and Domenico Piccolo and Claudia Sciacca and M A van Baak and H. Bulten and G. Raven and H. L. Snoek and Laura Wilden and C. P. Jessop and J M Losecco and Thomas Allmendinger and Gabriele Benelli and K. K. Gan and Klaus Honscheid and Dirk Hufnagel and Paul D. Jackson and Harris Kagan and R W Kass and T. M. Pulliam and Ali Mehdizadeh Rahimi and Ruben Ter-Antonyan and Q. K. Wong and J. E. Brau and Raymond Frey and O. Igonkina and Minghui Lu and Chris Potter and N. B. Sinev and David G Strom and Jan Strube and Eric C. Torrence and Filippo Galeazzi and Martino Margoni and Mattia Morandin and M. Posocco and Michael Rotondo and F. Simonetto and Roberto Stroili and Cesare Voci and Maurice Benayoun and Heather A. Briand and Jacques Chauveau and Paul David and Luca Del Buono and Ch de la Vaissi{\`e}re and Olivier Hamon and Madhu J John and Ph Leruste and J. Malcl{\`e}s and Jos{\'e} Ocariz and Lilian Roos and G. Therin and Pradipta Kumar Behera and L. D. Gladney and Q. H. Guo and J. H. Panetta and Maurizio Biasini and R. Covarelli and Simone Pacetti and M. Pioppi and C Ferrer Angelini and Giovanni Batignani and Stefano Bettarini and Francesca Bucci and Giovanni Calderini and Massimo Carpinelli and Rodrigo Alberto Cenci and Francesco Forti and M. A. Giorgi and Alberto Lusiani and Giovanni Marchiori and Matteo Morganti and Nicola Neri and Eugenio Paoloni and Matteo Rama and Giuliana Rizzo and John J. Walsh and M. Haire and Dave Judd and Deborah Wagoner and Jacek Biesiada and Nathan Danielson and P. Elmer and Y. P. Lau and C. Lu and Jackson Olsen and Angela J Smith and A. V. Telnov and Fabio Bellini and Gianluca Cavoto and Annunziata D'Orazio and Eddi di Marco and Riccardo Faccini and F. Ferrarotto and Fernando Ferroni and Mario Gaspero and L. Li Gioi and Marta Mazzoni and Silvio Morganti and Giovanni Piredda and F. Polci and F Safai Tehrani and Cecilia Voena and Henning Schr{\"o}der and Georg Wagner and Roland Waldi and T. Adye and Nynke de Groot and B. Franek and Gopi Prasshanth Gopal and Emmanuel Olaiya and F. F. Wilson and Roy Aleksan and Sarah Emery and Aline Gaidot and Sergey Ganzhur and P F Giraud and G. Graziani and Gautier Hamel De Monchenault and W. Kozanecki and Markov Legendre and G. W. London and Bernhard Mayer and G. J. VanDalen G. Vasseur and Ch Y{\`e}che and Marco Zito and Milind V. Purohit and Achim W. Weidemann and John Robert Wilson},
  journal={Physical review letters},
  year={2005},
  volume={95 14},
  pages={142001}
}
We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed… CONTINUE READING
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