Adlarson, P., Augustyniak, W., Bardan, W. et al. (47 more authors) (2018) Search for C violation in the decay η → π0e+e− with WASA-at-COSY. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. pp. 378-384. ISSN 0370-2693
Abstract
We report on the search for the rare decay η→π0e+e− which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Jülich, Germany. In total 3×107 events of the reaction pd→3Heη have been recorded at an excess energy of Q=59.8MeV. Based on this data set the C parity violating decay η→π0γ⁎→π0e+e− via a single-photon intermediate state has been searched for, resulting in new upper limits of Γ(η→π0e+e−)/Γ(η→π+π−π0)<3.28×10−5 and Γ(η→π0e+e−)/Γ(η→all)<7.5×10−6 (CL=90%), respectively.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Author. Published by Elsevier B.V. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 17 Sep 2018 14:10 |
Last Modified: | 16 Oct 2024 15:04 |
Published Version: | https://doi.org/10.1016/j.physletb.2018.07.017 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.physletb.2018.07.017 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135818 |
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