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Title: Photoproduction of the f 1 ( 1285 ) meson

Journal Article · · Physical Review C
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The f1 (1285) meson with mass 1281.0 ± 0.8 MeV/c2 and width 18.4 ± 1.4 MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the ηπ + π -, K+ K0 π -, and K-K0 π+ decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the ηπ + π- final-state Dalitz distribution are consistent with the axial-vector JP = 1+ f1 (1285) identity, rather than the pseudoscalar 0-η (1295). The production mechanism is more consistent with s -channel decay of a high-mass N * state and not with t -channel meson exchange. Decays to η π π go dominantly via the intermediate a$$^±_0$$ (980) π states, with the branching ratio Γ [a0π (no $$\overline{K}K$$) ] / Γ [ηππ (all) ] = 0.74 ± 0.09 . The branching ratios Γ ($$\overline{K}K$$ π )/ Γ (ηππ) = 0.216 ± 0.033 and Γ (γρ0) / Γ (ηππ) = 0.047 ± 0.018 were also obtained. The first is in agreement with previous data for the f1 (1285), while the latter is lower than the world average.

Research Organization:
Mississippi State Univ., Mississippi State, MS (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
CLAS Collaboration
Grant/Contract Number:
FG02-07ER41528; FG02-87ER40315; AC05-06OR23177
OSTI ID:
1604564
Alternate ID(s):
OSTI ID: 1256385
Journal Information:
Physical Review C, Vol. 93, Issue 6; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Fate of the Landau–Yang theorem for twisted photons journal October 2019
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