Observation of a Broad Structure in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>Mass Spectrum around<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4.26</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>
B. AubertLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceR. BarateLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceD. BoutignyLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceF. CoudercLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceY. KaryotakisLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceJ. P. LeesLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceV. PoireauLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceV. TisserandLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceA. ZghicheLaboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, FranceE. GraugésIFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona, SpainA. PalanoDipartimento di Fisica and INFN, Università di Bari, I-70126 Bari, ItalyM. PappagalloDipartimento di Fisica and INFN, Università di Bari, I-70126 Bari, ItalyA. PompiliDipartimento di Fisica and INFN, Università di Bari, I-70126 Bari, ItalyJ. C. ChenInstitute of High Energy Physics, Beijing 100039, ChinaN. D. QiInstitute of High Energy Physics, Beijing 100039, ChinaG. RongInstitute of High Energy Physics, Beijing 100039, ChinaP. WangInstitute of High Energy Physics, Beijing 100039, ChinaY. S. ZhuInstitute of High Energy Physics, Beijing 100039, ChinaG. EigenInstitute of Physics, University of Bergen, N-5007 Bergen, NorwayI. OfteInstitute of Physics, University of Bergen, N-5007 Bergen, NorwayB. StuguInstitute of Physics, University of Bergen, N-5007 Bergen, NorwayG. S. AbramsLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAM. BattagliaLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAA. B. BreonLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAD. N. BrownLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAJ. Button‐ShaferLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAR. N. CahnLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAE. CharlesLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAC. T. DayLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAM. S. GillLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAA. V. GritsanLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAY. GroysmanLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAR. G. JacobsenLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAR. W. KadelLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAJ. A. KadykLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAL. T. KerthLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAYu. G. KolomenskyLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAG. KukartsevLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAG. LynchLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAL. M. MirLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAP. J. OddoneLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAT. J. OrimotoLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAM. PripsteinLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAN. A. RoeLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAM. T. RonanLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAW. A. WenzelLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USAM. BarrettUniversity of Birmingham, Birmingham B15 2TT, United KingdomK. E. FordUniversity of Birmingham, Birmingham B15 2TT, United KingdomT. HarrisonUniversity of Birmingham, Birmingham B15 2TT, United KingdomA. John HartUniversity of Birmingham, Birmingham B15 2TT, United KingdomC. M. HawkesUniversity of Birmingham, Birmingham B15 2TT, United KingdomS. E. MorganUniversity of Birmingham, Birmingham B15 2TT, United KingdomA. T. WatsonUniversity of Birmingham, Birmingham B15 2TT, United KingdomM. FritschInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyK. GoetzenInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyT. HeldInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyH. KochInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyB. LewandowskiInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyM. PelizaeusInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyΚ. PetersInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyT. Vazquez SchroederInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyM. SteinkeInstitut für Experimentalphysik 1, Ruhr Universität Bochum, D-44780 Bochum, GermanyJ. BoydUniversity of Bristol, Bristol BS8 1TL, United KingdomJ. P. BurkeUniversity of Bristol, Bristol BS8 1TL, United KingdomN. ChevalierUniversity of Bristol, Bristol BS8 1TL, United KingdomW. N. CottinghamUniversity of Bristol, Bristol BS8 1TL, United KingdomT. Çuhadar-DönszelmannUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaB. G. FulsomUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaC. HeartyUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaN. S. KnechtUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaT. S. MattisonUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaJ. A. McKennaUniversity of British Columbia, Vancouver, British Columbia V6T 1Z1, CanadaA. KhanBrunel University, Uxbridge, Middlesex UB8 3PH, United KingdomP. KyberdBrunel University, Uxbridge, Middlesex UB8 3PH, United KingdomM. SaleemBrunel University, Uxbridge, Middlesex UB8 3PH, United KingdomL. TeodorescuBrunel University, Uxbridge, Middlesex UB8 3PH, United KingdomA. E. BlinovBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaV.E. BlinovBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaA. D. BukinBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaV. P. DruzhininBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaV. B. GolubevBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaE. A. KravchenkoBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaA. P. OnuchinBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaS. I. SerednyakovBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaYu. I. SkovpenBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaE. P. SolodovBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaA. N. YushkovBudker Institute of Nuclear Physics, Novosibirsk 630090, RussiaDavid BestUniversity of California at Irvine, Irvine, California 92697, USAM. BondioliUniversity of California at Irvine, Irvine, California 92697, USAM. BruinsmaUniversity of California at Irvine, Irvine, California 92697, USAM. ChaoUniversity of California at Irvine, Irvine, California 92697, USAS. CurryUniversity of California at Irvine, Irvine, California 92697, USAI. EschrichUniversity of California at Irvine, Irvine, California 92697, USAD. KirkbyUniversity of California at Irvine, Irvine, California 92697, USAA. J. LankfordUniversity of California at Irvine, Irvine, California 92697, USAP. LundUniversity of California at Irvine, Irvine, California 92697, USAM. MandelkernUniversity of California at Irvine, Irvine, California 92697, USAR. K. MommsenUniversity of California at Irvine, Irvine, California 92697, USAW. RoethelUniversity of California at Irvine, Irvine, California 92697, USAD. P. StokerUniversity of California at Irvine, Irvine, California 92697, USA
2005lv
ABI
Abstract
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 structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.
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Cited by 30 references