Study of π[sup −]p→π[sup −ηp] and π[sup −]p→π[sup −]ηηp at s = 18.9 GeV with the COMPASS experiment
Author(s) -
I. Uman,
T. Schlüter,
V. Credé,
P. Eugenio,
A. Ostrovidov
Publication year - 2010
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.3483381
Subject(s) - physics , pion , large hadron collider , nuclear physics , compass , particle physics , amplitude , partial wave analysis , production (economics) , beam (structure) , quantum mechanics , economics , macroeconomics , optics
The COMPASS experiment at CERN studies diffractively produced states in the light quark sector with unprecedented statistics. The observation of $f_{0}$(1500)/ $f′_{2}$ (1525) decaying to $\eta\eta$ in 2008 data with incoming negative pion beam at 190 GeV/c poses the question whether it is produced centrally or formed by the decay of a heavier diffractively produced $\pi_{1}$(1800)$/\pi_{2}$(1880). To decide, a dedicated amplitude analysis which includes different production mechanisms is formulated and compared with one which was used to fit centrally produced resonances including $f_{0}$(1500) by the WA102 experiment. Unbinned mass-dependent log-likelihood fitting methods may serve to solve the ambiguities which are present in binned, mass-independent partial wave analyses
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