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Observation of the π(1800) and (1880) mesons in decay
Affiliation:

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 πpηηπp 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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