A new search for the KL→π0νν¯ and KL→π0X0 decays

Ahn, J. K.; Brubaker, Benjamin; Micallef, J.; Matsumura, T.; Kawasaki, Norioki; Chu, S. L.; Shinohara, Shuichi; Nakagiri, K.; Yoshida, Hiroshi; Usuki, Takeshi; Watanabe, H.; Ri, Y.D.; McFarland, Duncan; Satô, Tôru; Shiomi, K.; Su, Stephanie; Morgan, K.; Son, Ji-Seon; Suzuki, S.; Takahashi, G.; Woo, Jong-Kwan; Shimogawa, Tetsushi; Kamiji, I.; Masuda, Takahiko; Cai, T.; Lee, G.H.; Comfort, J. R.; Hutcheson, M.; Nanjo, H.; Lin, C. X.; Maeda, Y.; Okuno, H.; Miyazaki, Kiro; Hineno, T.; Yoshimoto, Hiroyuki; Lim, G. Y.; Chen, Ssu-Han; Banno, Satomi; Naito, D.; Shinkawa, T.; Sugiyama, Yasuyuki; Inagaki, T.; Murayama, R.; Togawa, M.; Toyoda, T.; Stevens, J. R.; Komatsubara, T. K.; Yamauchi, Hiroki; Odani, Y.; Lee, J.W.; Baek, K.Y.; Furukawa, T.; Duh, Y. t.; Yamaga, M.; Ogata, R.; Nomura, T.; Nakaya, Y.; Hsiung, Y.; Yanagida, Yasuyuki; Seki, Shu; Ma, J.; Isoe, M.; Lee, S.K.; Yamamoto, S.; Yamanaka, T.; Kamibayashi, T.; Campbell, M.; Carruth, C.; Nakajima, Yasuhiro; Sasaki, Misao; Kim, Y.J.; Takashima, Yasuhito; Iwai, E.; Sato, Katsuhiko; Teo, Ivan; Tung, Y. C.; Xu, J. J.; Whallon, N. L.; Ota, Toshihiko; Beckford, Brian; Kurilin, A. S.; Tecchio, M.; Ko, J.-W.; Wah, Y. W.; Sasao, N.; Yokota, H.; Tajima, Y.; Lee, H.S.; Kim, E.J.

doi:10.1093/ptep/ptx001

Cited by 18 publications

(20 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another fixed-target experiment, DIRAC [41] could look for (µ + µ − ) in an upgraded run [42]. The existing KOTO experiment [43] and proposed NA62-KLEVER [44] hope to achieve sensitivities to K L decays with BR ∼ 10 −13 , which would also present an opportunity to detect true muonium [37].…”

mentioning

confidence: 99%

Scouring meson decays for true muonium

Lamm

2019

Phys. Rev. D

View full text Add to dashboard Cite

Rare meson decay experiments promise to measure branching ratios as small as 10 −13 . This presents an opportunity to discover the µ + µ − bound state true muonium. We consider a set of possible channels, all with branching ratios above ∼ 10 −11 . For the electromagnetic decays η/η → (µ + µ − )γ, theoretical and phenomenological form factors F η/η γγ * (Q 2 ) allow predictions of BR(η → (µ + µ − )γ) ∼ 4.8 × 10 −10 and BR(η → (µ + µ − )γ) ∼ 3.7 × 10 −11 at the 5% level. Discussion of experimental prospects and potential backgrounds are made.

show abstract

mentioning

confidence: 99%

Scouring meson decays for true muonium

Lamm

2019

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…At the moment, results from KOTO [87] give Br(K L → π 0 νν) exp < 5.1 × 10 −8 (at 90% CL), while very recently NA62 released preliminary results implying Br(K + → π + νν) exp < 11 × 10 −10 (at 90% CL) [88], both of which do not improve the existing bounds given above. Finally, to mention a different experimental facility dedicated to improve our knowledge on rare kaon decays, KLEVER, a project to measure Br(K L → π 0 νν) at CERN, is currently under discussion, which if realized will start operations around 2026-2029, see [89] for details.…”

Section: Leptoquarks In Rare K Decaysmentioning

confidence: 96%

Footprints of leptoquarks: from $$ R_{K^{(*)}} $$ R K ( ∗ ) to

Fajfer¹,

Košnik²,

Silva³

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

Rare K → πνν decays, being dominated by short distance contributions within the standard model (SM), open a window for new physics (NP) searches at low energies. The K → πνν branching ratios are expected to be measured with ∼ 10% accuracies by NA62/CERN and KOTO/JPARC. The theoretical uncertainties of branching ratios within the SM are well under control. In the B sector, it is tentative to explain the B-meson anomalies R D ( * ) and/or R K ( * ) by effects of physics beyond the SM. Although NP seems to be present in the third fermion generation it might also manifest in the flavor changing neutral current transition s → d. Together with the anticipated good experimental sensitivities and accurate theoretical predictions for K → πνν, this motivates studies of correlated effects of NP in rare K → πνν and B → K ( * ) μ + μ − decays. Here we consider the loop induced effects in K → πνν in two leptoquark models designed to address lepton-flavor universality violation in the R K ( * ) anomalies.

show abstract

“…The experiment makes use of a tightly collimated neutral beam (average momentum 2 GeV) and compact, hermetic detector. From a brief pilot run in 2013, KOTO obtained the limit BR(K 0 L → π 0 νν) < 5.1 × 10 −8 (90% CL) [6]. The experiment ran for many months in 2015-2016, with various improvements to reduce the background.…”

Section: Rare K Decaysmentioning

confidence: 99%

“…Moreover, the NA62 [4] and KOTO [5,6] experiments are also taking data and will offer precise measurements of the extremely rare kaon decays K + → π + νν and K L → π 0 νν, whose branching ratios can be calculated with an incredible theoretical accuracy.…”

Section: Introductionmentioning

confidence: 99%

Summary of the CKM 2016 working group on rare decays

Ishikawa¹,

Lunghi²,

Moulson³

et al. 2017

Proceedings of 9th International Workshop on the CKM Unitarity Triangle — PoS(CKM2016)

View full text Add to dashboard Cite

Rare B, D, and K decays offer unique opportunities to probe for evidence of new particles from physics beyond the Standard Model at mass scales extending from the electroweak scale to well above those directly accessible at the LHC. We review a selection of theoretical and experimental results on these decays illustrating the progress made during the past two years.9th International Workshop on the CKM Unitarity Triangle

show abstract

A new search for the KL→π0νν¯ and KL→π0X0 decays

Cited by 18 publications

References 27 publications

Scouring meson decays for true muonium

Scouring meson decays for true muonium

Footprints of leptoquarks: from $$ R_{K^{(*)}} $$ R K ( ∗ ) to

Summary of the CKM 2016 working group on rare decays

Contact Info

Product

Resources

About