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Measurement of η meson decays into lepton-antilepton pairs
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- Calén, Hans (author)
- Uppsala universitet,Institutionen för kärn- och partikelfysik
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- Fransson, Kjell (author)
- Uppsala universitet,Institutionen för kärn- och partikelfysik
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- Gustafsson, Leif (author)
- Uppsala universitet,Institutionen för kärn- och partikelfysik
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- Keleta, Samson (author)
- Kullander, Sven (author)
- Petterson, Henrik (author)
- Thörngren Engblom, Pia (author)
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- (creator_code:org_t)
- 2007
- English 9 s.
- Series: e-Print: arXiv ; 0711.3531
- Reports (other academic/artistic)
Abstract
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- A search for rare lepton decays of the η meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay η→e+e−e+e− events are reported with a background of 1.3±0.2 events. This allows to set an upper limit to the branching ratio of 9.7×10−5 η(90% CL). The branching ratio for the decay η→e+e−γ is determined to (7.8±0.5stat ±0.8syst)×10−3 in agreement with world average value. An upper limit (90% CL) for the branching ratio for the η→e+e− decay is 2.7 × 10−5 and a limit for the sum of the η→μ+μ−μ+μ− and η→π+π−μ+μ− decays is 3.6 × 10−4.
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- Calén, Hans
- Fransson, Kjell
- Gustafsson, Leif
- Höistad, Bo
- Jacewicz, Marek
- Johansson, Tord
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- Keleta, Samson
- Kullander, Sven
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