Search for the decay KL → 3γ

Barr, G.; Buchholz, P.; Cundy, D.; Doble, N.; Gatignon, L.; Grafström, P.; Hagelberg, R.; Wahl, H.; Peach, Ken; Beier, Thomas; Blümer, H.; Coward, D.; Heinz, R.; Kleinknecht, K.; Leber, F.; Renk, B.; Rohrer, H.; Sander, H. G.; Scheerer, F.; Scheidt, Jörg; Staeck, J.; Wagner, Andreas; Augé, E.; Fournier, D.; Iconomidou-Fayard, L.; Perdereau, O.; Schaffer, A. C.; Serin, L.; Bertanza, L.; Calafiura, P.; Calvetti, M.; Carosi, R.; Casali, R.; Cerri, C.; Mannelli, I.; Marzulli, V.; Nappi, A.; Pierazzini, G.; Holder, M.; Kreutz, A.; Rost, M.; Werthenbach, R.

doi:10.1016/0370-2693(95)01044-q

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…One might then naively expect from the measured branching ratio B K L → 2γ ≃ 5.5 × 10 −4 [1] that B K L → 3γ ∼ α em B K L → 2γ ∼ 4 × 10 −6 . However, this expectation is already too large in comparison to the result of the first experimental search for the 3γ mode, B K L → 3γ < 2.4 × 10 −7 [1,2]. As for K S → 3γ, there is currently no experimental information available on it, but it is likely to be more suppressed than expected as well.…”

Section: Introductionmentioning

confidence: 87%

Kaon Decay into Three Photons Revisited

Ho¹,

Tandean²

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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We evaluate the rare radiative kaon decays K L,S → 3γ. Applying the requirements of gauge invariance and Bose symmetry, we derive a general form of the decay amplitude, including both parity-conserving and parity-violating contributions. We employ a chiral-Lagrangian approach combined with dimensional analysis arguments to estimate the branching ratios of these decays in the standard model, obtaining values as large as B K L → 3γ ∼ 1 × 10 −14 and B K S → 3γ ∼ 2 × 10 −17 , which exceed those found previously by a few orders of magnitude. Measurements on the branching ratios which are significantly larger than these numbers would likely hint at the presence of new physics beyond the standard model.

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Section: Introductionmentioning

confidence: 87%

Kaon Decay into Three Photons Revisited

Ho¹,

Tandean²

2016

Proceedings of Flavor Physics &Amp; CP Violation 2015 — PoS(FPCP2015)

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“…DOI We report the first results of a search for the decay K 0 L ! 3 since the last experimental update in 1995 [1]. Although the decay is forbidden by charge-conjugation invariance, it can proceed via weak parity-violating interactions without violating CP.…”

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confidence: 99%

Search for the decayKL0→3γ

Tung¹,

Ahn²,

Akune³

et al. 2011

Phys. Rev. D

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We performed a search for the decay K 0 L ! 3 with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of K 0 L ! 3 proceeding via parity-violation, we obtained the single event sensitivity to be ð3:23 AE 0:14Þ Â 10 À8 , and set an upper limit on the branching ratio to be 7:4 Â 10 À8 at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of K 0 L ! 3 proceeding via parityconservation were also presented in this paper.We report the first results of a search for the decay K 0 L ! 3 since the last experimental update in 1995 [1]. Although the decay is forbidden by charge-conjugation invariance, it can proceed via weak parity-violating interactions without violating CP. But due to further suppressions by the gauge invariance and Bose statistics [2], the branching ratio (BR) of K 0 L ! 3 is expected to be very small. Assuming the decay proceeds via K 0 L ! 0 0 ! 3 process with two 0 's internally converting to photons, the calculated BRðK 0 L ! 3Þ is 3 Â 10 À19 [3]. Recently, a new calculation based on the parity-violating model showed that the BR should be in the range of 1 Â 10 À19 BRðK 0 L ! 3Þ 7 Â 10 À17 [4]. The E391a experiment [5,6] was conducted at KEK using neutral kaons produced by 12 GeV protons incident on a 0.8-cm-diameter and 6-cm-long platinum target. The proton intensity was typically 2 Â 10 12 per spill coming every 4 sec. The neutral beam [7], with a solid angle of 12:6 str, was defined by a series of six sets of collimators and a pair of sweeping magnets aligned at a production angle of 4 degrees. A 7-cm-thick lead block and

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Rare kaon decays

Buchholz

Renk

1997

Progress in Particle and Nuclear Physics

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Search for the decay KL → 3γ

Cited by 7 publications

References 7 publications

Kaon Decay into Three Photons Revisited

Kaon Decay into Three Photons Revisited

Search for the decayKL0→3γ

Rare kaon decays

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