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First observation of τ → 3πηντ and τ → f1πντ decays

Abstract:

We have observed new channels for τ decays with an η in the final state. We study 3-prong tau decays, using the η → γγ and η → 3π0 decay modes and 1-prong decays with two π0's using the η → γγ channel. The measured branching fractions are B(τ- → π- π- π+ ηντ) = (3.4-0.5+0.6 ± 0.6) × 10-4 and B(τ- → π- 2π0ηντ) = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ- → f1π- ντ) = (5.8;-1.3+1.4 ± 1.8) × 10-4. We have also searched for η′(958) production an...

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Publisher copy:
10.1103/PhysRevLett.79.2406

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Journal:
Physical Review Letters
Volume:
79
Issue:
13
Pages:
2406-2410
Publication date:
1997-01-01
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Source identifiers:
321902
Language:
English
Pubs id:
pubs:321902
UUID:
uuid:37525c5b-467f-4506-89dc-50c65cdd467f
Local pid:
pubs:321902
Deposit date:
2013-11-17

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