Nonleptonic decays of kaons in the expansion

Fukugita, M.; Inami, Takeo; Sakai, Norisuke; Yazaki, S.

doi:10.1016/0370-2693(77)90711-0

Cited by 47 publications

(26 citation statements)

References 14 publications

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“…However, we have learned from charmed meson decays that the naive factorization approach never works for the decay rate of color-suppressed decay modes, although it usually works for color-allowed decays. Empirically, it was learned in the 1980s that if the Fierz-transformed terms characterized by 1/N c are dropped, the discrepancy between theory and experiment is greatly reduced [91][92][93]. This leads to the socalled large-N c approach to describing hadronic D decays [94].…”

Section: Nonleptonic Decaysmentioning

confidence: 99%

Charmed baryons circa 2015

2015

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Section: Nonleptonic Decaysmentioning

confidence: 99%

Charmed baryons circa 2015

2015

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“…We have learned from charmed meson decays that naive factorization does not work for colorsuppressed decay modes. Empirically, it was realized in the 1980s that if the Fierz-transformed terms characterized by 1=N c are dropped, the discrepancy between theory and experiment is greatly improved [30]. This leads to the so-called large-N c approach for describing hadronic D decays [31].…”

Section: A Factorizable Contributionsmentioning

confidence: 99%

Singly Cabibbo-suppressed hadronic decays of Λc+

Cheng

Kang

2018

Phys. Rev. D

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We study singly Cabibbo-suppressed two-body hadronic decays of the charmed baryon Λ þ c , namely,We use the measured rate of Λ þ c → pϕ to fix the effective Wilson coefficient a 2 for naive color-suppressed modes and the effective number of color N eff c . We rely on the current-algebra approach to evaluate W-exchange and nonfactorizable internal W-emission amplitudes, that is, the commutator terms for the S wave and the pole terms for the P wave. Our prediction for Λ þ c → pη is in excellent agreement with the BESIII measurement. The pη (pπ 0 ) mode has a large (small) rate because of a large constructive (destructive) interference between the factorizable and nonfactorizable amplitudes for both S and P waves. Some of the SU(3) relations such asMðΛ þ c → pπ 0 Þ derived under the assumption of sextet dominance are not valid for decays with factorizable terms. Our calculation indicates that the branching fraction of Λ þ c → nπ þ is about 3.5 times larger than that of Λ þ c → pπ 0 . Decay asymmetries are found to be negative for all singly Cabibbo-suppressed modes and range from −0.56 to −0.96.

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“…It is also known for sometime that the leading 1/N c expansion operates reasonably well for exclusive two-body nonleptonic decays of charmed mesons [4]; 1 the discrepancy between theory and experiment for color-suppressed channels e.g. D 0 →K 0 π 0 is greatly improved provided that contributions from Fierz-transformed currents, which are suppressed by order 1/N c , are dropped [6,7]. Due to the success of the 1/N c approach to charmed meson decays, it has been widely believed by many practitioners in this field that it applies equally well to the weak decays of bottom mesons.…”

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Nonfactorizable contributions to nonleptonic weak decays of heavy mesons

Cheng

1994

Physics Letters B

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Nonfactorizable contributions to exclusive two-body nonleptonic weak decays of heavy mesons arising from color octet currents, characterized by the parameter r 2 , are extracted from the data. It is found that r 2 is equal to ∼ −0.67 , −(0.9 ∼ 1.1), − (1.2 ∼ 1.3), ∼ 0.36 respectively for D →Kπ,K * π,K * ρ,B → Dπ decays. As expected, soft-gluon effects become stronger when the decay particles are less energetic, allowing more time for significant final-state strong interactions. As a consequence, the parameter a 2 is not universal and is channel or class dependent, contrary to the anticipation of the factorization approach.The leading 1/N c expansion works most successfully for D →Kπ decays as the subleading 1/N c factorizable contribution is almost compensated by the soft-gluon effect. We argue that,in contrast to what happens in B − → D ( * ) π(ρ) decays, the nonfactorizable term and the subleading 1/N c factorizable term inB → ψK ( * ) decays are opposite in signs, in accordance with a recent QCD sum rule calculation. Implications are discussed.

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Nonleptonic decays of kaons in the expansion

Cited by 47 publications

References 14 publications

Charmed baryons circa 2015

Charmed baryons circa 2015

Singly Cabibbo-suppressed hadronic decays of Λc+

Nonfactorizable contributions to nonleptonic weak decays of heavy mesons

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