Measurement of the relative probability of φ → ηγ decay in the η → π+π-π0 channel

M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, S. V. Burdin, A. V. Vasil'ev, D. I. Ganyushin, I. A. Gaponenko, V. B. Golubev, T. V. Dimova, S. I. Dolinskiǐ, V. P. Druzhinin, M. S. Dubrovin, A. S. Zakharov, V. N. Ivanchenko, P. M. Ivanov, A. A. Korol, S. V. KoshubaG. A. Kukhartsev, A. A. Mamutkin, A. V. Otboev, E. V. Pakhtusova, A. A. Sal'nikov, S. I. Serednyakov, V. A. Sidorov, Z. K. Silagadze, V. V. Sharyǐ, Yu M. Shatunov

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Abstract

The relative decay probability B(φ → ηγ) = (1.259 ± 0.030 ± 0.059)% in the decay channel η → π+π-π0 has been measured in an experiment using a spherical neutral detector in the VEPP-2M electron-positron storage ring. The result agrees with the tabulated value and with measurements of this probability using the spherical neutral detector in other η-meson decay channels.

Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalJournal of Experimental and Theoretical Physics
Volume90
Issue number1
DOIs
StatePublished - Jan 2000
Externally publishedYes

Funding

agrees with the world average of 0.324 – 0.007 and is of comparable accuracy. From the sum of three measurements using the SND detector in different h -meson decay channels we can also obtain B(f ee)B(f hg ) = (3.848 – 0.036 – 0.070) · 10–6, B(f hg ) = (1.287 – 0.012 – 0.042)%, which is the most accurate measurement made using a single detector. This work was supported by the STP Integration Fund (Grant no. 274) and by the Russian Foundation for Basic Research (Grants nos. 96-15-96327, 97-02-18563, and 99-02-17155).

FundersFunder number
Russian Foundation for Basic Research96-15-96327, 97-02-18563, 99-02-17155
STP Integration Fund274

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