Study of $J/\psi \to \eta \phi \pi^+ \pi^-$ at BESIII - INSPIRE

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Study of $J/\psi \to \eta \phi \pi^+ \pi^-$ at BESIII

BESIII

Collaboration

Dec 16, 2014

11 pages

Published in:

Phys.Rev.D 91 (2015) 5, 052017

Published: Mar 20, 2015

e-Print:

1412.5258 [hep-ex]

DOI:

10.1103/PhysRevD.91.052017

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit \phi}}{{\mathit f}_{{{1}}}{(1285)}}

Experiments:

BEPC-BES-III

View in:

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Abstract: (APS)

Based on a sample of 2.25×108J/ψ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/ψ→ηϕπ+π-. The Y(2175) resonance is observed in the invariant mass spectrum of ϕf0(980) with a statistical significance of greater than 10σ. The corresponding mass and width are determined to be M=2200±6(stat)±5(syst) MeV/c2 and Γ=104±15(stat)±15(syst) MeV, respectively, and the product branching fraction is measured to be B(J/ψ→ηY(2175),Y(2175)→ϕf0(980),f0(980)→π+π-)=(1.20±0.14(stat)±0.37(syst))×10-4. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of J/ψ→ϕf1(1285) with f1(1285)→ηπ+π- and set upper limits on the branching fractions for J/ψ→ϕη(1405)/ϕX(1835)/ϕX(1870) with η(1405)/X(1835)/X(1870)→ηπ+π- at the 90% confidence level.

Note:

11 pages, 11 figures

12.39.Mk
13.25.Gv
14.40.Be
14.40.Rt
electron positron: annihilation
electron positron: colliding beams
J/psi(3100): hadronic decay
pi: pair production
J/psi(3100): branching ratio: measured
J/psi(3100): branching ratio: upper limit

References(45)

Figures(11)

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