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Search for C violation in the decay eta -> pi(0)e(+)e(-) with WASA-at-COSY
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Natl Ctr Nucl Res, Dept Nucl Phys, Ul Hoza 69, PL-00681 Warsaw, Poland.
Jagiellonian Univ, Inst Phys, Prof Stanislawa Lojasiewicza 11, PL-30348 Krakow, Poland.
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2018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 784, p. 378-384Article in journal (Refereed) Published
Abstract [en]

We report on the search for the rare decay eta -> pi(0)e(+)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 Julich, Germany. In total 3 x 10(7) events of the reaction pd -> He-3 eta have been recorded at an excess energy of Q = 59.8MeV. Based on this data set the C parity violating decay eta -> pi(0)gamma* -> pi(0)e(+)e(-) via a single-photon intermediate state has been searched for, resulting in new upper limits of Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> pi(+) pi(-) pi(0)) < 3.28 x 10(-5) and Gamma(eta -> pi(0)e(+) e(-))/Gamma(eta -> all)< 7.5 x 10(-6) (CL=90%), respectively. 

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 784, p. 378-384
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Subatomic Physics Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:uu:diva-368116DOI: 10.1016/j.physletb.2018.07.017ISI: 000445781600056OAI: oai:DiVA.org:uu-368116DiVA, id: diva2:1268492
Funder
EU, FP7, Seventh Framework Programme, 227431Swedish Research CouncilKnut and Alice Wallenberg FoundationAvailable from: 2018-12-06 Created: 2018-12-06 Last updated: 2018-12-06Bibliographically approved

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Adlarson, PatrikCalén, HansFransson, KjellGullström, Carl-OskarHeijkenskjöld, LenaJohansson, TordKupsc, AndrzejMarciniewski, PawelPszczel, DamianPyszniak, AndzejWolke, MagnusZlomanczuk, Jozef

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Adlarson, PatrikCalén, HansFransson, KjellGullström, Carl-OskarHeijkenskjöld, LenaJohansson, TordKupsc, AndrzejMarciniewski, PawelPszczel, DamianPyszniak, AndzejWolke, MagnusZlomanczuk, Jozef
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Physics Letters B
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