Naturally large cosmological neutrino asymmetries in the minimal supersymmetric standard model

S. Prakhov, W. B. Tippens, C. Allgower, V. Bekrenev, E. Berger, W. J. Briscoe, M. Clajus, J. R. Comfort, K. Craig, D. Grosnick, G. M. Huber, D. Isenhower, N. Knecht, D. Koetke, A. Koulbardis, N. Kozlenko, S. Kruglov, T. Kycia, G. J. Lolos, I. LopatinD. M. Manley, A. Marušić, R. Manweiler, S. McDonald, B. M K Nefkens, J. Olmsted, Z. Papandreou, D. Peaslee, G. J. Peterson, N. Phaisangittisakul, M. Pulver, A. F. Ramirez, M. E. Sadler, A. Shafi, I. Šlaus, H. Spinka, S. Stanislaus, A. Starostin, H. M. Staudenmaier, I. Supek, C. W. Wong

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We report the first determination of the upper limit for the branching ratio of the CP forbidden decay η → 4π0. No events were observed in a sample of 3.0 × 107 η decays. The experiment was performed with the Crystal Ball multiphoton spectrometer installed in a separated p- beam at the AGS (Alternating Gradient Synchrotron). At the 90% confidence limit, B(η → 4π0) ≤ 6.9 × 10-7.

Original languageEnglish (US)
Pages (from-to)4802-4805
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number21
DOIs
StatePublished - Jan 1 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Prakhov, S., Tippens, W. B., Allgower, C., Bekrenev, V., Berger, E., Briscoe, W. J., Clajus, M., Comfort, J. R., Craig, K., Grosnick, D., Huber, G. M., Isenhower, D., Knecht, N., Koetke, D., Koulbardis, A., Kozlenko, N., Kruglov, S., Kycia, T., Lolos, G. J., ... Wong, C. W. (2000). Naturally large cosmological neutrino asymmetries in the minimal supersymmetric standard model. Physical Review Letters, 84(21), 4802-4805. https://doi.org/10.1103/PhysRevLett.84.4802