A SIGNAL OF A NARROW PI-NN RESONANCE IN PP-]PP-PI(-)PI(+)

Authors
BRODOWSKI W BILGER R CALEN H CLEMENT H EKSTROM C FOHL K FRANSSON K GUSTAFSSON L HAGGSTROM S HOISTAD B JOHANSSON A JOHANSSON T KILIAN K KULLANDER S KUPSC A KURZ G MARCINIEWSKI P MOROSOV B MOEHN J MORTSELL A OELERT W RENKEN V RUBER R SCHEPKIN MG SIODLACZEK U STEPANIAK J SUKHANOV A TUROWIECKI A WAGNER GJ WILHELMI Z ZABIEROWSKI J ZERNOV A ZLOMANCZUK J
Citation
W. Brodowski et al., A SIGNAL OF A NARROW PI-NN RESONANCE IN PP-]PP-PI(-)PI(+), ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 355(1), 1996, pp. 5-8
Citations number
8
Categorie Soggetti
Physics, Nuclear","Physics, Particles & Fields
Journal title
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI → ACNP
ISSN journal
09397922
Volume
355
Issue
1
Year of publication
1996
Pages
5 - 8
Database
ISI
SICI code
0939-7922(1996)355:1<5:ASOANP>2.0.ZU;2-B
Abstract
We report on the first exclusive measurement of the 2 pi production in NN collisions at T-p = 750 MeV using a H-2 cluster jet target and the WASA/PROMICE detector at CELSIUS. In the invariant-mass spectrum M(pp pi-) we observe a narrow peak at 2.063(2) GeV with a 4 sigma deviatio n relative to the MC simulations for the conventional nonresonant 2 pi production process. The finding is in agreement with the hypothesis o f a narrow pi NN resonance with I(J(P)) = even (0(-)), called d', post ulated recently to describe the peculiar resonance-like behavior of th e pionic double charge exchange on nuclei.