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Observation of a New J{sup PC} = 1{sup {minus}+} Exotic State in the Reaction {pi}{sup {minus}}p {r_arrow} {pi}{sup +} {pi}{sup {minus}}{pi}{sup {minus}} p at 18 GeV/c

Journal Article · · Physical Review Letters
OSTI ID:289171
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  1. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. Nuclear Physics Institute, Moscow State University, Moscow, (Russia) 119899
  3. Department of Physics, University of Massachusetts Dartmouth, North Dartmouth, Massachusetts 02747 (United States)
  4. Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
  5. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
  6. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)
  7. Department of Physics, Northwestern University, Evanston, Illinois 60208 (United States)
  8. Institute for High Energy Physics, Protvino, (Russia) 142284
+ Show Author Affiliations

A partial-wave analysis of the reaction {pi}{sup {minus}}p{r_arrow}{pi}{sup +}{pi}{sup {minus} }{pi}{sup {minus}}p at 18 GeV/c has been performed on a data sample of 250thinsp000 events obtained by Brookhaven experiment E852. The expected J{sup PC}=1{sup ++}a{sub 1}(1260) , 2{sup ++}a{sub 2}(1320) , and 2{sup {minus}+}{pi}{sub 2}(1670) resonant states are clearly observed. The exotic J{sup PC}=1{sup {minus}+} wave produced in the natural parity exchange processes shows distinct resonancelike phase motion at about 1.6 GeV/c{sup 2} in the {rho}{pi} channel. A mass-dependent fit results in a resonance mass of 1593{plus_minus}8{sup +29}{sub {minus}47} MeV /c{sup 2} and a width of 168{plus_minus}20{sup +150}{sub {minus}12} MeV /c{sup 2} . {copyright} {ital 1998} {ital The American Physical Society }

OSTI ID:
289171
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 81; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
EXOTIC RESONANCES
MASS
PARITY
PARTIAL WAVES
PION-PROTON INTERACTIONS
PIONS MINUS
PIONS PLUS
QUANTUM CHROMODYNAMICS
RESONANCE PARTICLES