Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>K</mml:mi><mml:mi>L</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>decay

Ogata, R.; Suzuki, S.; Ahn, J. K.; Akune, Y.; Баранов, В. А.; Chen, Kai-Feng; Comfort, J. R.; Doroshenko, M.; Fujioka, Y.; Inagaki, T.; Ishibashi, S.; Ishihara, N.; Ishii, H.; Iwai, E.; Iwata, T.; Kato, I.; Kobayashi, S.; Komatsu, S; Komatsubara, T. K.; Kurilin, A. S.; Kuzmin, E. S.; Lednev, A.A.; Lee, H. S.; Lee, S. Y.; Lim, G. Y.; Ma, J.; Matsumura, T.; Moisseenko, A.; Morii, H.; Morimoto, Takahiro; Nakajima, Yasuhiro; Nakano, Takashi; Nanjo, H.; Nishi, N.; Nix, J.R.; Nomura, T.; Nomachi, M.; Okuno, H.; Omata, K.; Perdue, G. N.; Perov, S. V.; Podolsky, S.; Porokhovoy, S.; Sakashita, K.; Sasaki, T.; Sasao, N.; Sato, Hitoshi; Satô, Tôru; Sekimoto, M.; Shimogawa, Tetsushi; Shinkawa, T.; Stepanenko, Yu. Yu.; Sugaya, Y.; Sugiyama, A.; Sumida, T.; Tajima, Y.; Takita, S.; Tsamalaidze, Z.; Tsukamoto, T.; Tung, Y. C.; Wah, Y. W.; Watanabe, H.; Wu, M.; Yamaga, M.; Yamanaka, T.; Yoshida, Hiroshi; Yoshimura, Y.; Zheng, Y.

doi:10.1103/physrevd.84.052009

Cited by 13 publications

(16 citation statements)

References 12 publications

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“…As regards the four-body kaon decays, the SM expectations are B(K − → π 0 π − νν) sm ∼ 10 −14 and B(K L → π 0 π 0 νν) sm ∼ 10 −13 [13,35,36]. These are way below the existing empirical bounds B(K − → π 0 π − νν) exp < 4.3 × 10 −5 [37] 7 and B(K L → π 0 π 0 νν) exp < 8.1 × 10 −7 [38], both at 90% CL. We may then impose…”

Section: A Sm Predictions and Empirical Informationmentioning

confidence: 78%

Rare hyperon decays with missing energy

Tandean

2019

J. High Energ. Phys.

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We explore the strangeness-changing decays of the lightest hyperons into another baryon plus missing energy within and beyond the standard model (SM). In the SM these processes arise from the loopinduced quark transition s → dνν and their branching fractions are estimated to be less than 10 −11 . In the presence of new physics (NP) the rates of these hyperon decays with missing energy could increase significantly with respect to the SM expectations because of modifications to the SM process or contributions from additional modes with new invisible particles. Adopting a model-independent approach and taking into account constraints from the kaon sector, we find that the current data on K → πνν do not permit sizable NP impact on the hyperon decays via underlying operators having mainly parity-even quark parts. In contrast, NP operators with primarily parity-odd quark parts are much less restricted by the existing bounds on K → invisible and K → ππνν and consequently could produce substantially amplifying effects on the hyperon modes. Their NP-enhanced branching fractions could reach levels potentially observable in the ongoing BESIII experiment. * Electronic address: jtandean@yahoo.com

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Section: A Sm Predictions and Empirical Informationmentioning

confidence: 78%

Rare hyperon decays with missing energy

Tandean

2019

J. High Energ. Phys.

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“…The E391a experiment has improved the limit from previous experiments (5.9 × 10 −7 [54] using π 0 → e + e − γ) 4 by a factor of 23. E391a also obtained an upper limit of 8.1 × 10 −7 [56] for the branching ratio of the K 0 L → π 0 π 0 νν decay, which is a CP conserving process and is sensitive to Reλ t (Fig. 4 right).…”

Section: K → πννmentioning

confidence: 91%

“…The limits are presented in [59]. Limits on the three-body decays K − → π − π 0 S 0 and K 0 L → π 0 π 0 S 0 were obtained in the ISTRA+ results [193] and in the E391a results [56], respectively, as searches for light pseudoscalar sgoldstino-particles S 0 [194]. The discovery potential of the rare FCNC kaon decays with missing energy in the final state is discussed recently in [195].…”

Section: Us and Ckm Unitaritymentioning

confidence: 99%

Experiments with -meson decays

Komatsubara

2012

Progress in Particle and Nuclear Physics

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Recent results and future prospects of the particle physics experiments with neutral and charged K-meson (kaon) decays are reviewed. Topics include CP violation, rare decays, leptons in kaon decays, tests of CPT and quantum mechanics, radiative decays, hadrons in kaon decays, basic observables, V us and CKM unitarity, and exotic searches. Experimental techniques developed for the kaon decay experiments are discussed.

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“…Since they also enterc V;A νν 0 but with the opposite relative sign, and since all of these couplings participate in the hyperon rates in Eqs. (9) and (10), one way to amplify the hyperon rates and satisfy Eq. 20simultaneously is if C V;A νν 0 ¼ 0, which implies…”

Section: A Sm Fermions Onlymentioning

confidence: 99%

“…[6,7], the impact of NP could still be large through operators having exclusively parity-odd ds quark bilinears. The reason is that these operators do not participate directly in K → πE, hence not restricted by their data, and are instead subject to restraints from the channels with no or two pions, namely K → E and K → ππ 0 E, which at the moment have comparatively loose empirical bounds [5,[8][9][10]. Future efforts to improve upon the data on the latter two sets of channels would then be highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Exploring leptoquark effects in hyperon and kaon decays with missing energy

Tandean

2020

Phys. Rev. D

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We entertain the possibility that scalar leptoquarks (LQs) generate consequential effects on the strangeness-changing decays of hyperons and kaons involving missing energy carried away by a pair of invisible fermions. Although such processes have suppressed rates in the standard model (SM), they could get significant enhancement in the presence of the LQs. In order to respect the available data on the kaon modes K → πνν and increase the rates of the hyperon decays substantially at the same time, two different scalar LQs are needed. If the LQs have Yukawa couplings solely to SM fermions, we find that the hyperon rates cannot attain values within the reach of ongoing or near-future experiments because of the combined constraints from the measurements on kaon mixing and lepton-flavor-violating processes. However, if we include light right-handed neutrinos in the LQ interactions, their contributions can evade the leading restrictions and translate into hyperon rates which may be big enough to be probed by upcoming searches. Thus, these hyperon modes could provide a new avenue for seeking sterile neutrinos.

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Study of theKL0→π0π0νν¯decay

Cited by 13 publications

References 12 publications

Rare hyperon decays with missing energy

Rare hyperon decays with missing energy

Experiments with -meson decays

Exploring leptoquark effects in hyperon and kaon decays with missing energy

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