Photoproduction of the meson
Journal Article
·
· Physical Review C
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) (SC-26)
- Contributing Organization:
- CLAS Collaboration
- Grant/Contract Number:
- AC05-06OR23177; FG02-07ER41528; FG02-87ER40315
- OSTI ID:
- 1604564
- Alternate ID(s):
- OSTI ID: 1366475
OSTI ID: 1256385
OSTI ID: 1256692
- Journal Information:
- Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 93; ISSN PRVCAN; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Fate of the Landau–Yang theorem for twisted photons
|
journal | October 2019 |
| Fate of the Landau-Yang theorem for twisted photons | text | January 2019 |
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