Observation of the Narrow State<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo>(</mml:mo><mml:mn>3872</mml:mn><mml:mo>)</mml:mo><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><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:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>p</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">T</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>
D. Acosta(University of Florida), A. A. Affolder(University of California, Santa Barbara), Myunggeun Ahn(Seoul National University), T. Akimoto(University of Tsukuba), M. Albrow(Fermi National Accelerator Laboratory), D. Ambrose(University of Pennsylvania), S. Amerio(University of Padua), D. Amidei(University of Michigan), A. Anastassov(Rutgers, The State University of New Jersey), K. Anikeev(Massachusetts Institute of Technology), A. Annovi(University of Pisa), J. Antoš(Institute of Physics, Academia Sinica), M. Aoki(University of Tsukuba), G. Apollinari(Fermi National Accelerator Laboratory), J-F. Arguin(University of Toronto), T. Arisawa(Waseda University), A. Artikov(Joint Institute for Nuclear Research), T. Asakawa(University of Tsukuba), W. Ashmanskas(Argonne National Laboratory), A. Attal(University of California, Los Angeles), F. Azfar(University of Oxford), P. Azzi(University of Padua), N. Bacchetta(University of Padua), H. Bachacou(Lawrence Berkeley National Laboratory), W. Badgett(Fermi National Accelerator Laboratory), S. Bailey(Harvard University Press), A. Barbaro‐Galtieri(Lawrence Berkeley National Laboratory), Gareth J. Barker(Karlsruhe Institute of Technology), V. E. Barnes(Purdue University West Lafayette), B. A. Barnett(Johns Hopkins University), S. Baroiant(University of California, Davis), M. Barone(Istituto Nazionale di Fisica Nucleare), G. Bauer(Massachusetts Institute of Technology), F. Bedeschi(University of Pisa), S. Behari(Johns Hopkins University), S. Belforte(Istituto Nazionale di Fisica Nucleare), W. H. Bell(University of Glasgow), G. Bellettini(University of Pisa), J. Bellinger(University of Wisconsin–Madison), D. Benjamin(Duke University), A. Beretvas(Fermi National Accelerator Laboratory), A. Bhatti(Rockefeller University), M. Binkley(Fermi National Accelerator Laboratory), D. Bisello(University of Padua), M. Bishai(Fermi National Accelerator Laboratory), R. E. Blair(Argonne National Laboratory), C. Blocker(Brandeis University), K. Bloom(University of Michigan), B. Blumenfeld(Johns Hopkins University), A. Bocci(Rockefeller University), A. Bodek(University of Rochester), G. Bolla(Purdue University West Lafayette), A. Bolshov(Massachusetts Institute of Technology), P.S.L. Booth(University of Liverpool), D. Bortoletto(Purdue University West Lafayette), J. Boudreau(University of Pittsburgh), S. Bourov(Fermi National Accelerator Laboratory), C. Bromberg(Michigan State University), E. Brubaker(Lawrence Berkeley National Laboratory), J. Budagov(Joint Institute for Nuclear Research), H. S. Budd(University of Rochester), K. Burkett(Fermi National Accelerator Laboratory), G. Busetto(University of Padua), P. Bussey(University of Glasgow), K. L. Byrum(Argonne National Laboratory), S. Cabrera(Duke University), P. Calafiura(Lawrence Berkeley National Laboratory), M. Campanelli(University of Geneva), M. Campbell(University of Michigan), A. Canepa(Purdue University West Lafayette), D. Carlsmith(University of Wisconsin–Madison), S. Carron(Duke University), R. Carosi(University of Pisa), M. Casarsa(Istituto Nazionale di Fisica Nucleare), A. Castro(Istituto Nazionale di Fisica Nucleare), P. Catastini(University of Pisa), D. Cauz(Istituto Nazionale di Fisica Nucleare), A. Cerri(Lawrence Berkeley National Laboratory), C. Cerri(University of Pisa), A. Cerri(University of Illinois Urbana-Champaign), J. Chapman(University of Michigan), C. Chen(University of Pennsylvania), Y. C. Chen(Institute of Physics, Academia Sinica), M. Chertok(University of California, Davis), G. Chiarelli(University of Pisa), G. Chlachidze(Joint Institute for Nuclear Research), F. Chlebana(Fermi National Accelerator Laboratory), K. Cho(Seoul National University), D. Chokheli(Joint Institute for Nuclear Research), M. L. Chu(Institute of Physics, Academia Sinica), J. Y. Chung(The Ohio State University), W-H. Chung(University of Wisconsin–Madison), Y. S. Chung(University of Rochester), C. I. Ciobanu(University of Illinois Urbana-Champaign), M. A. Ciocci(University of Pisa), A. Clark(University of Geneva), D. Clark(Brandeis University), M. Coca(University of Rochester), A. Connolly(Lawrence Berkeley National Laboratory), M. E. Convery(Rockefeller University), J. Conway(Rutgers, The State University of New Jersey), M. Cordelli(Istituto Nazionale di Fisica Nucleare), G. Cortiana(University of Padua), J. Cranshaw(Texas Tech University), R. Culbertson(Fermi National Accelerator Laboratory), C. Currat(Lawrence Berkeley National Laboratory), D. Cyr(University of Wisconsin–Madison), D. Dagenhart(Brandeis University), S. DaRonco(University of Padua), S. D’Auria(University of Glasgow), P. de Barbaro(University of Rochester), S. De Cecco(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), G. De Lentdecker(University of Rochester), S. Dell’Agnello(Istituto Nazionale di Fisica Nucleare), M. Dell’Orso(University of Pisa), S. Demers(University of Rochester), L. Demortier(Rockefeller University), M. Deninno(Istituto Nazionale di Fisica Nucleare), D. De Pedis(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), P. F. Derwent(Fermi National Accelerator Laboratory), C. Dionisi(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), J. Dittmann(Fermi National Accelerator Laboratory), P. Doksus(University of Illinois Urbana-Champaign), A. Dominguez(Lawrence Berkeley National Laboratory), S. Donati(University of Pisa), M. D’Onofrio(University of Geneva), T. Dorigo(University of Padua), V. Drollinger(University of New Mexico), K. Ebina(Waseda University), N. Eddy(University of Illinois Urbana-Champaign), R. Ely(Lawrence Berkeley National Laboratory), R. Erbacher(Fermi National Accelerator Laboratory), M. Erdmann(Karlsruhe Institute of Technology), D. Errede(University of Illinois Urbana-Champaign), S. Errede(University of Illinois Urbana-Champaign), R. Eusebi(University of Rochester), H-C. Fang(Lawrence Berkeley National Laboratory), S. M. Farrington(University of Liverpool), I. Fedorko(University of Pisa), R. G. Feild(Yale University), M. Feindt(Karlsruhe Institute of Technology), J. P. Fernandez(Purdue University West Lafayette), C. Ferretti(University of Michigan), R. D. Field(University of Florida), I. Fiori(University of Pisa), G. Flanagan(Michigan State University), B. Flaugher(Fermi National Accelerator Laboratory), L. R. Flores Castillo(University of Pittsburgh), A. Foland(Harvard University Press), S. Forrester(University of California, Davis), G. W. Foster(Fermi National Accelerator Laboratory), M. Franklin(Harvard University Press), H. Frisch(Fermi National Accelerator Laboratory), Y. Fujii(High Energy Accelerator Research Organization), I. K. Furic(Massachusetts Institute of Technology), A. Gaijar(University of Liverpool), A. Gallas(Northwestern University), M. Gallinaro(Rockefeller University), J. Galyardt(Carnegie Mellon University), M. Garcia-Sciveres(Lawrence Berkeley National Laboratory), A. F. Garfinkel(Purdue University West Lafayette), C. Gay(Duke University), H. Gerberich(Duke University), E. Gerchtein(Carnegie Mellon University), D. W. Gerdes(University of Michigan), S. Giagu(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), P. Giannetti(University of Pisa), S. M. Gibson(Lawrence Berkeley National Laboratory), K. Gibson(Carnegie Mellon University), C. M. Ginsburg(University of Wisconsin–Madison), K. Giolo(Purdue University West Lafayette), M. P. Giordani(Istituto Nazionale di Fisica Nucleare), G. Giurgiu(Carnegie Mellon University), V. Glagolev(Joint Institute for Nuclear Research), D. Glenzinski(Fermi National Accelerator Laboratory), M. Gold(University of New Mexico), N. Goldschmidt(University of Michigan), D. Goldstein(University of California, Los Angeles), J. Goldstein(University of Oxford), G. Gómez(Universidad de Cantabria), G. Gomez Ceballos(Massachusetts Institute of Technology), M. Goncharov(Texas A&M University), I. Gorelov(University of New Mexico), A. T. Goshaw(Duke University), Y. Gotra(University of Pittsburgh), K. Goulianos(Rockefeller University), A. Gresele(Istituto Nazionale di Fisica Nucleare), C. Grosso-Pilcher(Fermi National Accelerator Laboratory), M. Guenther(Purdue University West Lafayette), J. Guimarães da Costa(Harvard University Press), C. Haber(Lawrence Berkeley National Laboratory), K. I. Hahn(University of Pennsylvania), S. R. Hahn(Fermi National Accelerator Laboratory), E. Halkiadakis(University of Rochester), C. Hall(Harvard University Press), R. Handler(University of Wisconsin–Madison), F. Happacher(Istituto Nazionale di Fisica Nucleare), K. Hara(University of Tsukuba), M. Hare(Tufts University), R. Harr(Wayne State University), R. M. Harris(Fermi National Accelerator Laboratory), F. Hartmann(Karlsruhe Institute of Technology), K. Hatakeyama(Rockefeller University), J. Hauser(University of California, Los Angeles), C. P. Hays(Duke University), H. S. Hayward(University of Liverpool), E. Heider(Tufts University), B. Heinemann(University of Liverpool), J. J. Heinrich(University of Pennsylvania), M. Hennecke(Karlsruhe Institute of Technology), M. Herndon(Johns Hopkins University), C. Hill(University of California, Santa Barbara), D. Hirschbuehl(Karlsruhe Institute of Technology), A. Höcker(University of Rochester), K. D. Hoffman(Fermi National Accelerator Laboratory), A. Holloway(Harvard University Press), S. Hou(Institute of Physics, Academia Sinica), M. Houlden(University of Liverpool), Y. Huang(Duke University), T. B. Huffman(University of Oxford), R. E. Hughes(The Ohio State University), J. Huston(Michigan State University), K. Ikado(Waseda University), J. Incandela(University of California, Santa Barbara), G. Introzzi(University of Pisa), M. Iori(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), Y. Ishizawa(University of Tsukuba), Ç. İşsever(University of California, Santa Barbara), A. Ivanov(University of Rochester), Y. Iwata(Hiroshima University), B. Iyutin(Massachusetts Institute of Technology), E. James(Fermi National Accelerator Laboratory), D. Jang(Rutgers, The State University of New Jersey), J. Jarrell(University of New Mexico), D. Jeans(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), H. Jensen(Fermi National Accelerator Laboratory), M. Jones(Purdue University West Lafayette), S. Y. Jun(Carnegie Mellon University), T. R. Junk(University of Illinois Urbana-Champaign), T. Kamon(Texas A&M University), J. S. Kang(University of Michigan), M. Karagöz Ünel(Northwestern University), P. E. Karchin(Wayne State University), S. Kartal(Fermi National Accelerator Laboratory), Y. Kato(Osaka City University), Y. Kemp(Karlsruhe Institute of Technology), R. Kephart(Fermi National Accelerator Laboratory), U. Kerzel(Karlsruhe Institute of Technology), V. Khotilovich(Texas A&M University), B. Kilminster(The Ohio State University), B. J. Kim(Seoul National University), D. H. Kim(Seoul National University), H. S. Kim(University of Illinois Urbana-Champaign), J. E. Kim(Seoul National University), M. J. Kim(Seoul National University), M. S. Kim(Seoul National University), S. B. Kim(Seoul National University), S. H. Kim(Seoul National University), T. H. Kim(Massachusetts Institute of Technology), Y. K. Kim(Fermi National Accelerator Laboratory), B. T. King(University of Liverpool), M. Kirby(Duke University), L. Kirsch(Brandeis University), S. Klimenko(University of Florida), B. Knuteson(Massachusetts Institute of Technology), B. R. Ko(Duke University), H. Kobayashi(University of Tsukuba), P. Koehn(The Ohio State University), K. Kondo(Waseda University), J. Konigsberg(University of Florida), K. Kordas(University of Toronto), A. Korn(Massachusetts Institute of Technology), A. Korytov(University of Florida), K. Kotelnikov(Institute for Theoretical and Experimental Physics), A. Kotwal(Duke University), A. Kovalev(University of Pennsylvania), J. Kraus(University of Illinois Urbana-Champaign), I. Kravchenko(Massachusetts Institute of Technology), A. Kreymer(Fermi National Accelerator Laboratory), J. Kroll(University of Pennsylvania), M. Kruse(Duke University), V. Krutelyov(Texas A&M University), S. E. Kuhlmann(Argonne National Laboratory), N. Kuznetsova(Fermi National Accelerator Laboratory), A. T. Laasanen(Purdue University West Lafayette), S. Lai(University of Toronto), S. Lami(Rockefeller University), S. Lammel(Fermi National Accelerator Laboratory), M. Lancaster(Duke University), M. Lancaster(University College London), R. L. Lander(University of California, Davis), K. Lannon(The Ohio State University), A. Lath(Rutgers, The State University of New Jersey), G. Latino(University of New Mexico), R. Lauhakangas(University of Helsinki), I. Lazzizzera(University of Padua), Y. Le(Johns Hopkins University), C. Lecci(Karlsruhe Institute of Technology), T. LeCompte(Argonne National Laboratory), J. Lee(Seoul National University), J. Lee(Seoul National University), S. W. Lee(Texas A&M University), N. Leonardo(Massachusetts Institute of Technology), S. Leone(University of Pisa), J. D. Lewis(Fermi National Accelerator Laboratory), K. Li(Yale University), C. S. Lin(Fermi National Accelerator Laboratory), M. Lindgren(University of California, Los Angeles), T. M. Liss(University of Illinois Urbana-Champaign), D. O. Litvintsev(Fermi National Accelerator Laboratory), Tao Liu(Fermi National Accelerator Laboratory), Yajie Liu(University of Geneva), N. S. Lockyer(University of Pennsylvania), A. Loginov(Institute for Theoretical and Experimental Physics), J. Loken(University of Oxford), M. Loreti(University of Padua), P. Loverre(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), D. Lucchesi(University of Padua), P. Lukens(Fermi National Accelerator Laboratory), L. Lyons(University of Oxford), J. Lys(Lawrence Berkeley National Laboratory), D. MacQueen(University of Toronto), R. Madrak(Harvard University Press), K. Maeshima(Fermi National Accelerator Laboratory), P. Maksimovic(Johns Hopkins University), L. Malferrari(Istituto Nazionale di Fisica Nucleare), G. Manca(University of Oxford), R. Marginean(The Ohio State University), A. Martin(Northwestern University), M. Martín(Fermi National Accelerator Laboratory), V. Martin(Northwestern University), M. Martı́nez(Fermi National Accelerator Laboratory), T. Maruyama(Fermi National Accelerator Laboratory), H. Matsunaga(University of Tsukuba), M. E. Mattson(Wayne State University), P. Mazzanti(Istituto Nazionale di Fisica Nucleare), K. S. McFarland(University of Rochester), D. McGivern(University College London), P. McIntyre(Texas A&M University), Peter McNamara(Rutgers, The State University of New Jersey), R. McNulty(University of Liverpool), S. Menzemer(Massachusetts Institute of Technology), A. Menzione(University of Pisa), P. Merkel(Fermi National Accelerator Laboratory), C. Mesropian(Rockefeller University), A. Messina(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), A. Meyer(Fermi National Accelerator Laboratory), T. Miao(Fermi National Accelerator Laboratory), N. Miladinovic(Brandeis University), L. S. Miller(University of Michigan), R. Miller(University of Michigan), J. S. Miller(University of Michigan), R. Miquel(Lawrence Berkeley National Laboratory), S. Miscetti(Istituto Nazionale di Fisica Nucleare), M. Mishina(Fermi National Accelerator Laboratory), G. Mitselmakher(University of Florida), A. Miyamoto(High Energy Accelerator Research Organization), Y. Miyazaki(Osaka City University), N. Moggi(Istituto Nazionale di Fisica Nucleare), R. W. Moore(Fermi National Accelerator Laboratory), M. J. Morello(University of Pisa), T. Moulik(Purdue University West Lafayette), A. Mukherjee(Fermi National Accelerator Laboratory), M. Mulhearn(Massachusetts Institute of Technology), Th. Müller(Karlsruhe Institute of Technology), R. Mumford(Johns Hopkins University), A. Munar(University of Pennsylvania), P. Murat(Fermi National Accelerator Laboratory), J. Nachtman(Fermi National Accelerator Laboratory), S. Nahn(Yale University), I. Nakamura(University of Pennsylvania), I. Nakano(Okayama University), A. Napier(Tufts University), R. Napora(Johns Hopkins University), V. Necula(University of Florida), F. Niell(University of Michigan), J. Nielsen(Lawrence Berkeley National Laboratory), Charles A. Nelson(Fermi National Accelerator Laboratory), T. Nelson(Fermi National Accelerator Laboratory), C. Neu(The Ohio State University), M. S. Neubauer(Massachusetts Institute of Technology), C. Newman-Holmes(Fermi National Accelerator Laboratory), A-S. Nicollerat(University of Geneva), T. Nigmanov(University of Pittsburgh), L. Nodulman(Argonne National Laboratory), K. Oesterberg(University of Helsinki), T. Ogawa(Waseda University), S. H. Oh(Hiroshima University), Y. D. Oh(Seoul National University), T. Ohsugi(Hiroshima University), R. Oishi(University of Tsukuba), T. Okusawa(Osaka City University), R. Oldeman(University of Pennsylvania), R. Orava(University of Helsinki), W. Orejudos(Lawrence Berkeley National Laboratory), C. Pagliarone(University of Pisa), F. Palmonari(University of Pisa), R. Paoletti(University of Pisa), V. Papadimitriou(Texas Tech University), S. Pashapour(University of Toronto), J. Patrick(Fermi National Accelerator Laboratory), G. Pauletta(Istituto Nazionale di Fisica Nucleare), M. Paulini(Carnegie Mellon University), T. Pauly(University of Oxford), C. Paus(Massachusetts Institute of Technology), D. Pellett(University of California, Davis), A. Penzo(Istituto Nazionale di Fisica Nucleare), T. J. Phillips(Duke University), G. Piacentino(University of Pisa), J. Piedra(Universidad de Cantabria), K. Pitts(University of Illinois Urbana-Champaign), A. Pompoš(Purdue University West Lafayette), L. Pondrom(University of Wisconsin–Madison), G. Pope(University of Pittsburgh), O. Poukhov(Joint Institute for Nuclear Research), F. Prakoshyn(Joint Institute for Nuclear Research), T. Pratt(University of Liverpool), A. Pronko(University of Florida), J. Proudfoot(Argonne National Laboratory), F. Ptohos(Istituto Nazionale di Fisica Nucleare), G. Punzi(University of Pisa), J. Rademacker(University of Oxford), A. Rakitine(Massachusetts Institute of Technology), S. Rappoccio(Harvard University Press), F. Ratnikov(Rutgers, The State University of New Jersey), H. Ray(University of Michigan), A. Reichold(University of Oxford), V. Reković(University of New Mexico), P. Renton(University of Oxford), M. Rescigno(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), F. Rimondi(Istituto Nazionale di Fisica Nucleare), K. Rinnert(Karlsruhe Institute of Technology), L. Ristori(University of Pisa), W. J. Robertson(Duke University), A. Robson(University of Oxford), T. Rodrigo(Universidad de Cantabria), S. Rolli(Tufts University), L. Rosenson(Massachusetts Institute of Technology), R. Roser(Fermi National Accelerator Laboratory), R. Rossin(University of Padua), C. Rott(Purdue University West Lafayette), J. Russ(Carnegie Mellon University), A. Ruiz-Jimeno(Universidad de Cantabria), D. Ryan(Tufts University), H. Saarikko(University of Helsinki), A. Safonov(University of California, Davis), R. St. Denis(University of California, Los Angeles), W. K. Sakumoto(University of Rochester), D. Saltzberg(University of California, Los Angeles), C. Sánchez(The Ohio State University), A. Sansoni(Istituto Nazionale di Fisica Nucleare), L. Santi(Istituto Nazionale di Fisica Nucleare), S. Sarkar(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), K. Satô(University of Tsukuba), P. Savard(University of Toronto), A. Savoy-Navarro(Fermi National Accelerator Laboratory), P. Schemitz(Karlsruhe Institute of Technology), P. Schlabach(Fermi National Accelerator Laboratory), E. E. Schmidt(Fermi National Accelerator Laboratory), M. P. Schmidt(Yale University), M. Schmitt(Northwestern University), L. Scodellaro(University of Padua), A. Scribano(University of Pisa), F. Scuri(University of Pisa), A. Sedov(Purdue University West Lafayette), S. Seidel(University of New Mexico), Y. Seiya(University of Tsukuba), F. Semeria(Istituto Nazionale di Fisica Nucleare), L. Sexton-Kennedy(Fermi National Accelerator Laboratory), I. Sfiligoi(Istituto Nazionale di Fisica Nucleare), M. Shapiro(Lawrence Berkeley National Laboratory), T. Shears(University of Liverpool), P. F. Shepard(University of Pittsburgh), M. Shimojima(University of Tsukuba), M. Shochet(Fermi National Accelerator Laboratory), Y. Shon(University of Wisconsin–Madison), A. Sidoti(University of Pisa), M. Siket(Institute of Physics, Academia Sinica), A. Sill(Texas Tech University), P. Sinervo(University of Toronto), A. Sisakyan(Joint Institute for Nuclear Research), A. Skiba(Karlsruhe Institute of Technology), A. J. Slaughter(Fermi National Accelerator Laboratory), K. Śliwa(Tufts University), J. R. Smith(University of California, Davis), F. D. Snider(Fermi National Accelerator Laboratory), R. Snihur(University of Toronto), S. V. Somalwar(Rutgers, The State University of New Jersey), J. Spalding(Fermi National Accelerator Laboratory), M. Spezziga(Texas Tech University), L. Spiegel(Fermi National Accelerator Laboratory), F. Spinella(University of Pisa), M. Spiropulu(University of California, Santa Barbara), P. Squillacioti(University of Pisa), H. Stadie(Karlsruhe Institute of Technology), B. Stelzer(University of Toronto), O. Stelzer-Chilton(University of Toronto), J. Strologas(University of New Mexico), D. Stuart(University of California, Santa Barbara), A. Sukhanov(University of Florida), K. Sumorok(Massachusetts Institute of Technology), H. Sun(Tufts University), Takashi Suzuki(University of Tsukuba), A. Taffard(University of Illinois Urbana-Champaign), R. Tafirout(University of Toronto), S. Takach(Wayne State University), Hideaki Takano(University of Tsukuba), R. Takashima(Hiroshima University), Y. Takeuchi(University of Tsukuba), K. Takikawa(University of Tsukuba), P. Tamburello(Duke University), M. Tanaka(Argonne National Laboratory), R. Tanaka(Okayama University), N. Tanimoto(Okayama University), S. Tapprogge(University of Helsinki), M. Tecchio(University of Michigan), P. K. Teng(Institute of Physics, Academia Sinica), K. Terashi(Rockefeller University), R. J. Tesarek(Fermi National Accelerator Laboratory), S. Tether(Massachusetts Institute of Technology), J. Thom(Fermi National Accelerator Laboratory), A. S. Thompson(University of Glasgow), E. Thomson(The Ohio State University), R. Thurman-Keup(Argonne National Laboratory), P. Tipton(University of Rochester), V. Tiwari(Carnegie Mellon University), S. Tkaczyk(Fermi National Accelerator Laboratory), D. Toback(Texas A&M University), K. Tollefson(Michigan State University), D. Tonelli(University of Pisa), M. Tönnesmann(Michigan State University), S. Torre(University of Pisa), D. Torretta(Fermi National Accelerator Laboratory), W. Trischuk(University of Toronto), J. Tseng(Massachusetts Institute of Technology), Ryosuke Tsuchiya(Waseda University), S. Tsuno(University of Tsukuba), D. Tsybychev(University of Florida), N. Turini(University of Pisa), M. Turner(University of Liverpool), F. Ukegawa(University of Tsukuba), T. Unverhau(University of Glasgow), S. Uozumi(University of Tsukuba), D. Usynin(University of Pennsylvania), L. Vacavant(Lawrence Berkeley National Laboratory), T. Vaiciulis(University of Rochester), A. Varganov(University of Michigan), E. Vataga(University of Pisa), S. Vejcik(Fermi National Accelerator Laboratory), G. Velev(Fermi National Accelerator Laboratory), G. Veramendi(Lawrence Berkeley National Laboratory), T. Vickey(University of Illinois Urbana-Champaign), R. Vidal(Fermi National Accelerator Laboratory), I. Vila(Universidad de Cantabria), R. Vilar(Universidad de Cantabria), I. Volobouev(Lawrence Berkeley National Laboratory), M. von der Mey(University of California, Los Angeles), R. G. Wagner(Argonne National Laboratory), R. L. Wagner(Argonne National Laboratory), W. Wagner(Karlsruhe Institute of Technology), N. B. Wallace(Rutgers, The State University of New Jersey), T. Walter(Karlsruhe Institute of Technology), Z. Wan(Rutgers, The State University of New Jersey), M. J. Wang(Institute of Physics, Academia Sinica), S. M. Wang(University of Florida), A. Warburton(University of Toronto), B. F. L. Ward(University of Glasgow), S. Waschke(University of Glasgow), D. Waters(University College London), T. Watts(Rutgers, The State University of New Jersey), M. Weber(Lawrence Berkeley National Laboratory), W. C. Wester(Fermi National Accelerator Laboratory), B. Whitehouse(Tufts University), A. B. Wicklund(Argonne National Laboratory), E. Wicklund(Fermi National Accelerator Laboratory), H. H. Williams(University of Pennsylvania), P. Wilson(Fermi National Accelerator Laboratory), B. L. Winer(The Ohio State University), P. Wittich(University of Pennsylvania), S. Wolbers(Fermi National Accelerator Laboratory), M. W. Wolter(Tufts University), M. Worcester(University of California, Los Angeles), S. D. Worm(Rutgers, The State University of New Jersey), T. Wright(University of Michigan), X. Wu(University of Geneva), F. Würthwein(Massachusetts Institute of Technology), A. Wyatt(University College London), A. Yagil(Fermi National Accelerator Laboratory), T. Yamashita(Okayama University), K. Yamamoto(Osaka City University), U. K. Yang(Fermi National Accelerator Laboratory), W. Yao(Lawrence Berkeley National Laboratory), G. P. Yeh(Fermi National Accelerator Laboratory), K. Yi(Johns Hopkins University), J. Yoh(Fermi National Accelerator Laboratory), P. Yoon(University of Rochester), K. Yorita(Waseda University), T. Yoshida(Osaka City University), I. Yu(Seoul National University), S. S. Yu(University of Pennsylvania), Z. Yu(Yale University), J. C. Yun(Fermi National Accelerator Laboratory), L. Zanello(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), A. Zanetti(Istituto Nazionale di Fisica Nucleare), I. Zaw(Harvard University Press), F. Zetti(University of Pisa), J. Zhou(Rutgers, The State University of New Jersey), A. Zsenei(University of Geneva), S. Zucchelli(Istituto Nazionale di Fisica Nucleare)
Cited by 628Open Access
Abstract
We report the observation of a narrow state decaying into $J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and produced in $220\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ of $\stackrel{\ifmmode \bar{}\else \={}\fi{}}{p}p$ collisions at $\sqrt{s}=1.96\text{ }\mathrm{T}\mathrm{e}\mathrm{V}$ in the CDF II experiment. We observe $730\ifmmode\pm\else\textpm\fi{}90$ decays. The mass is measured to be $3871.3\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the $X(3872)$ meson.
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