Measurement of {eta} meson decays into lepton-antilepton pairs
Journal Article
·
· Physical Review. D, Particles Fields
- Andrzej Soltan Institute for Nuclear Studies, Warsaw and Lodz (Poland)
- Stockholm University, Stockholm (Sweden)
- Physikalisches Institut der Universitaet Tuebingen, Tuebingen (Germany)
- Joint Institute for Nuclear Research, Dubna (Russian Federation)
A search for rare lepton decays of the {eta} meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay {eta}{yields}e{sup +}e{sup -}e{sup +}e{sup -} events are reported with a background of 1.3{+-}0.2 events. This allows to set an upper limit to the branching ratio of 9.7x10{sup -5} (90% CL). The branching ratio for the decay {eta}{yields}e{sup +}e{sup -}{gamma} is determined to (7.8{+-}0.5{sub stat}{+-}0.8{sub syst})x10{sup -3} in agreement with world average value. An upper limit (90% CL) for the branching ratio for the {eta}{yields}e{sup +}e{sup -} decay is 2.7x10{sup -5} and a limit for the sum of the {eta}{yields}{mu}{sup +}{mu}{sup -}{mu}{sup +}{mu}{sup -} and {eta}{yields}{pi}{sup +}{pi}{sup -}{mu}{sup +}{mu}{sup -} decays is 3.6x10{sup -4}.
- OSTI ID:
- 21039006
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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