Observation of Significant Flavor-SU(3) Breaking in the Kaon Wave Function at 12 &lt; Q 2 &lt; 25     GeV 2 and Discovery of the Charmless Decay ψ ( 3770 ) → K S 0 K L 0

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, T. T.; Chang, W. L.; Che, G. R.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, S. L.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Choi, S. K.; Chu, X.; Cibinetto, G.; Coen, S. C.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Duan, Z. H.; Egorov, P.; Fan, Y. 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doi:10.1103/PhysRevLett.132.131901

Observation of Significant Flavor-SU(3) Breaking in the Kaon Wave Function at $12 < Q^{2} < 25 {GeV}^{2}$ and Discovery of the Charmless Decay $ψ (3770) \to K_{S}^{0} K_{L}^{0}$

Journal Article · Mon Mar 25 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.131901· OSTI ID:2328165

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

We present cross sections for the reaction $e^{+} e^{-} \to K_{S}^{0} K_{L}^{0}$ at center-of-mass energies ranging from 3.51 to 4.95 GeV using data samples collected in the BESIII experiment, corresponding to a total integrated luminosity of $26.5 {fb}^{- 1}$ . The ratio of neutral-to-charged kaon form factors at large momentum transfers ( $12 < Q^{2} < 25 {GeV}^{2}$ ) is determined to be $0.21 \pm 0.01$ , which indicates a small but significant effect of flavor-SU(3) breaking in the kaon wave function, and, consequently, excludes the possibility that flavor-SU(3) breaking is the primary reason for the strong experimental violation of the pQCD prediction $| F (π^{\pm}) | / | F (K^{\pm}) | = f_{π}^{2} / f_{K}^{2}$ , where $F (π^{\pm})$ and $F (K^{\pm})$ are the form factors, and $f_{π}$ and $f_{K}$ are the decay constants of charged pions and kaons, respectively. We also observe a significant signal for the charmless decay $ψ (3770) \to K_{S}^{0} K_{L}^{0}$ for the first time. Within a $1 σ$ contour of the likelihood value, the branching fraction for $ψ (3770) \to K_{S}^{0} K_{L}^{0}$ is determined to be $B = (2.6 3_{- 1.59}^{+ 1.40}) \times 10^{- 5}$ , and the relative phase between the continuum and $ψ (3770)$ amplitudes is $ϕ = (- 0.3 9_{- 0.10}^{+ 0.05}) π$ . The branching fraction is in good agreement with the $S$ - and $D$ -wave charmonia mixing scheme proposed in the interpretation of the “ $ρ π$ puzzle” between $J / ψ$ and $ψ (3686)$ decays.

Published by the American Physical Society 2024

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Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2328165

Alternate ID(s):: OSTI ID: 2579680

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Physics

Observation of Significant Flavor-SU(3) Breaking in the Kaon Wave Function at 12 < Q 2 < 25 GeV 2 and Discovery of the Charmless Decay ψ ( 3770 ) → K S 0 K L 0

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Observation of Significant Flavor-SU(3) Breaking in the Kaon Wave Function at $12 < Q^{2} < 25 {GeV}^{2}$ and Discovery of the Charmless Decay $ψ (3770) \to K_{S}^{0} K_{L}^{0}$