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Title: First study of η c(1S), η(1760) and X(1835) production via η 'π⁺π⁻ final states in two-photon collisions

The invariant mass spectrum of the η 'π⁺π⁻ final state produced in two-photon collisions is obtained using a 673 fb⁻¹ data sample collected in the vicinity of the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We observe a clear signal of the η c(1S) and measure its mass and width to be M(η c(1S))=(2982.7±1.8(stat)±2.2(syst)±0.3(model)) MeV/c² and Γ(η c(1S))=(37.8 +5.8 –5.3(stat)±2.8(syst)±1.4(model)) MeV/c². The third error is an uncertainty due to possible interference between the η c(1S) and a nonresonant component. We also report the first evidence for η(1760) decay toη 'π⁺π⁻; we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and η(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product ΓγγB(η 'π⁺π⁻) for the X(1835).
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Publication Date:
Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 86; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-04-06 11:58:40; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1103287