Search for hidden charm states decaying intoJ/ψ or ψ’ plus pions

1 October 1994

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 50 (7) , 4258-4264
https://doi.org/10.1103/physrevd.50.4258

Abstract

A search has been made in 300 GeV/c

π^{\pm}

- and proton-Li interactions for production of states that decay into J/ψ or ψ’ plus one or two pions. A 2.5σ enhancement in the J/ψ

π^{0}

spectrum, possibly the recently reported

{}^{1}

P_{1}

state of charmonium, is observed at a mass of 3.527 GeV/

c^{2}

. In the J/ψ plus two pion mass spectrum, we report, together with the expected ψ’→J/ψ

π^{+}

π^{-}

, the tentative observation of a structure at a mass of 3.836 GeV/

c^{2}

. No enhancements are seen in the J/ψ

π^{\pm}

π^{\pm}

, J/ψ

π^{\pm}

π^{0}

, J/ψ

π^{\pm}

, or ψ’

π^{\pm}

mass spectra.

Keywords

This publication has 15 references indexed in Scilit:

The experiment 705 electromagnetic shower calorimeter
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1993
Production ofJ/ψ via ψ’ and χ decay in 300 GeV/cproton- and $π^{\pm}$ -nucleon interactions
Physical Review Letters, 1993
Measurement of $\frac{J}{ψ}$ and $ψ^{'}$ production in 300-GeV/c proton, antiproton, and $π^{\pm}$ interactions with nuclei
Physical Review D, 1992
A measurement of the response of an SCG1-C scintillation glass array to 4–14 GeV/c pions
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1985
A measurement of the energy resolution and related properties of an SCG1-C scintillation glass shower counter array for 1–25 GeV positrons
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1985
High energy electromagnetic shower position measurement by a fine grained scintillation hodoscope
Nuclear Instruments and Methods in Physics Research, 1984
A measurement of the response of an SCG1-C scintillation glass shower detector to 2–17.5 GeV positrons
Nuclear Instruments and Methods in Physics Research, 1984
A fast processor for dilepton triggers
Nuclear Instruments and Methods in Physics Research, 1983
$Q^{2} {\bar{Q}}^{2}$ resonances in the baryon-antibaryon system
Physical Review D, 1978
Multiquark hadrons. I. Phenomenology of $Q^{2} {\bar{Q}}^{2}$ mesons
Physical Review D, 1977