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Observation of the π(1800) and (1880) mesons in decay |
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| Institution: | aDepartment of Physics, Florida State University, Tallahassee, FL 32306, USA bDepartment of Physics, Rensselaer Polytechnic Institute, Troy, NY 12180, USA cDepartment of Physics, University of Massachusetts Dartmouth, North Dartmouth, MA 02747, USA dDepartment of Physics, University of Notre Dame, Notre Dame, IN 46556, USA eNuclear Physics Institute, Moscow State University, Moscow 119899, Russian Federation fDepartment of Physics, Northwestern University, Evanston, IL 60208, USA gDepartment of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA hInstitute for High Energy Physics, Protvino 142284, Russian Federation iDepartment of Physics, Idaho State University, Pocatello, ID 83209, USA jThomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA |
| Abstract: | A partial-wave analysis of the reaction π−p→ηηπ−p at 18 GeV/c has been performed on a data sample of approximately 4000 events obtained by Brookhaven experiment E852. The JPC=0−+π(1800) state is observed in the a0(980)η and f0(1500)π decay modes. It has a mass of 1876±18±16 MeV/c2 and a width of 221±26±38 MeV/c2. The JPC=2−+π2(1880) meson is observed decaying through a2(1320)η. It has a mass of 1929±24±18 MeV/c2 and a width of 323±87±43 MeV/c2. Both states are potential candidates for non-exotic hybrid mesons. |
| Keywords: | Meson spectroscopy Partial wave analysis Hybrid mesons |
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