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Terasaki, K.; Ôneda, S.

doi:10.1103/physrevd.38.132

Cited by 14 publications

(18 citation statements)

References 23 publications

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“…In the past, explicitly taking into account dynamical contributions of various hadrons, we have studied nonleptonic weak decavs of K and charm mesons and have obtained good results on the approximate A I 1 = f rule in the K -m-r decays [2], the sizable rate [3] of D O +KO+, and the strong suppression [4] of F + -T +~~. In particular, we have demonstrated [5] that the observed large ratio [I], which is a long-standing puzzle, can be reproduced remarkably well by taking into account contributions of exotic four-quark mesons [6] to the intermediate states of the decay processes. However, in Ref.…”

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confidence: 93%

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Two-body decays of charm mesons and the role of exotic mesons

Terasaki

Ôneda

1993

Phys. Rev. D

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Two-body decays of charm mesons (except for decays into the final states involving 7 or 7') are studied from a perspective in which dynamical contributions of hadrons are explicitly taken into account. All the observed values of branching ratios for the two-body decays of charm mesons are reproduced well. In particular, a solution to the well-known puzzle,is presented. Contributions of exotic ( Q Q ) (~Q ) mesons can explain the large violation of the charm counterpart of the / A 1 I =+ rule in consistency with the small violation of the AZI = + rule in the K-a.rr decays. PACS number(s): 13.25. +m, 11.30.Hv, 14.40.J~ The fact that the D o +RO$ decay [which is described by the so-called annihilation type of quark-line diagrams in the infinite weak-boson-mass limit ( m + m )] has a sizable rate [I] implies that long distance effects are important in nonleptonic weak decays of charm mesons. In the past, explicitly taking into account dynamical contributions of various hadrons, we have studied nonleptonic weak decavs of K and charm mesons and have obtained good results on the approximate A I 1 = f rule in the K -m-r decays [2], the sizable rate [3] of D O +KO+, and the strong suppression [4] of F + -T +~~. In particular, we have demonstrated [5] that the observed large ratio [I], which is a long-standing puzzle, can be reproduced remarkably well by taking into account contributions of exotic four-quark mesons [6] to the intermediate states of the decay processes. However, in Ref. [5] we picked out only the contribution of the [QQ][QQ] but not that of the (QQ )(GQ) mesons. Therefore, the predicted rate of the D ++.rr+RO decay was very small in disagreement with experiment [I]. In this paper, we study typical twobody decays of charm mezojs by taking into account contributions of the (QQ )(QQ) mesons and a glueball in addition to those of the ground-state { QQ lo and the exotic [QQ][GG] mesons which were taken into account in Ref. [5] and demonstrate that all the observed values of the branching ratios for the two-body decays of charm mesons can be well reproduced. In particular, a solution to the well-known puzzle, is presented without contradiction to the other decays. The contributions of exotic (QQ )(QQ) mesons can explain the large violation of the charm counterpart of the IAIl=f rule in consistency with the small violation of the I AI 1 =+ rule in the K +an-decays.We start from a very useful expression for the decay amplitude which manifests dynamical contributions of hadrons. The amplitude for a three-pseudoscalar (PSImeson process, P , ( p )-P2( k) + P 3 ( q ) , can be approximated in the form [2,7,8] which is realized by using the partially-conserved axialvector current (PCAC) hypothesis and an extrapolation q+O in the light-cone frame [(LCF), i.e., p+ m 1. The above approximation can be considered as an innovation of the old soft-pion technique [9]. Here, the equal-time commutator (ETC) term, and the surface term M s , which vanishes in the soft PS meson extrapolation but now survives,

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confidence: 93%

“…However, in Ref. [5] we picked out only the contribution of the [QQ] [QQ] but not that of the (QQ )(GQ) mesons. Therefore, the predicted rate of the D ++.rr+RO decay was very small in disagreement with experiment [I].…”

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confidence: 98%

Two-body decays of charm mesons and the role of exotic mesons

Terasaki

Ôneda

1993

Phys. Rev. D

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“…in consistency with the other two-body decays of charm mesons [3,4,5]. Besides, the lighter (qq)(qq) (without * ) mesons are useful to understand the |∆I| = 1/2 rule and its violation in K → ππ decays in consistency with the K L -K S mass difference, the K L → γγ and the Dalitz decays of K L [6].…”

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confidence: 99%

“…[14].] Asymptotic matrix elements including fourquark states have been parameterized previously [3,4,5]. We here list the related ones,…”

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confidence: 99%

“…We discriminate these two by putting * on the former as in Table 1 according to Ref. [2] in which the four-quark mesons were studied within the framework of q = u, d and s. To explore hadronic weak decays of charm mesons, we have extended the above framework straightforwardly to q = u, d, s and c, and studied a role of four-quark mesons [3,4,5]. The heavier class of [qq][qq] and (qq)(qq) (with * ) can play a dramatic role in charm decays while the lighter class of them (without * ) can play an important role in hadronic weak interactions of K mesons [6].…”

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BABAR resonance as a new window of hadron physics

2003

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(1) where () and [ ] denote symmetry and anti-symmetry, respectively. The first two on the right-hand-side of Eq. (1) can have J P (C) = 0 +(+) . Each of them is again classified into two classes because of two different ways to produce color singlet {qqqq}. Since these two can mix with each other, however, they are classified into heavier and lighter ones after all. We discriminate these two by putting * on the former as in Table 1 according to Ref. [2] in which the four-quark mesons were studied within the framework of q = u, d and s. To explore hadronic weak decays of charm mesons, we have extended the above framework straightforwardly to q = u, d, s and c, and studied a role of four-quark mesons [3,4,5]. The heavier class of [qq][qq] and (qq)(qq) (with * ) can play a dramatic role in charm decays while the lighter class of them (without * ) can play an important role in hadronic weak interactions of K mesons [6]. Not only in hadron spectroscopy but also in hadronic weak interactions of K and charm mesons, therefore, it is very much important to confirm the existence of four-quark mesons.In this short note, however, we will concentrate on the [cq][qq] mesons (with q = u, d, s) since the other types of four-quark mesons will be massive enough to decay into two pseudoscalar mesons and therefore they will be broad and not very easy to observe. In Ref.[5], however, the mass ofF I ∼ [cq][sq] (with q = u, d) which was crudely estimated by using a simple quark counting and the result on the light four-quark meson masses in Ref. [2] was higher by ∼ 100 MeV than the measured one of the BABAR resonance since we took ∆m s = m s − m u = 0.2 GeV. We here revise the mass values of the [cq][qq] mesons exchanging the old value of ∆m s by a new one, ∆m s ≃ m Ds − m D ≃ 0

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