Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model

We investigate the exclusive semileptonic and rare D⟶πK decays within the standard model together with the light-front quark model (LFQM) constrained by the variational principle for the QCD-motivated effective Hamiltonian. The form factors are obtained in the q+=0 frame and then analytically contin...

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Autor principal:	Ho-Meoyng Choi
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/448b1eeb6542480eb2dfcf6ca5846c8d
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spelling	oai:doaj.org-article:448b1eeb6542480eb2dfcf6ca5846c8d2021-11-29T00:56:14ZCurrent-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model1687-736510.1155/2021/4277321https://doaj.org/article/448b1eeb6542480eb2dfcf6ca5846c8d2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/4277321https://doaj.org/toc/1687-7365We investigate the exclusive semileptonic and rare D⟶πK decays within the standard model together with the light-front quark model (LFQM) constrained by the variational principle for the QCD-motivated effective Hamiltonian. The form factors are obtained in the q+=0 frame and then analytically continue to the physical timelike region. Together with our recent analysis of the current-component independent form factors f±q2 for the semileptonic decays, we present the current-component independent tensor form factor fTq2 for the rare decays to make the complete set of hadronic matrix elements regulating the semileptonic and rare D⟶πK decays in our LFQM. The tensor form factor fTq2 are obtained from two independent sets JT+⊥,JT+− of the tensor current JTuv . As in our recent analysis of f−q2, we show that fTq2 obtained from the two different sets of the current components gives the identical result in the valence region of the q+=0 frame without involving the explicit zero modes and the instantaneous contributions. The implications of the zero modes and the instantaneous contributions are also discussed in comparison between the manifestly covariant model and the standard LFQM. In our numerical calculations, we obtain the q2-dependent form factors (f±,fT) for D⟶πK and branching ratios for the semileptonic D⟶πKℓvℓℓ=e,μ decays. Our results show in good agreement with the available experimental data as well as other theoretical model predictions.Ho-Meoyng ChoiHindawi LimitedarticlePhysicsQC1-999ENAdvances in High Energy Physics, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Ho-Meoyng Choi Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
description	We investigate the exclusive semileptonic and rare D⟶πK decays within the standard model together with the light-front quark model (LFQM) constrained by the variational principle for the QCD-motivated effective Hamiltonian. The form factors are obtained in the q+=0 frame and then analytically continue to the physical timelike region. Together with our recent analysis of the current-component independent form factors f±q2 for the semileptonic decays, we present the current-component independent tensor form factor fTq2 for the rare decays to make the complete set of hadronic matrix elements regulating the semileptonic and rare D⟶πK decays in our LFQM. The tensor form factor fTq2 are obtained from two independent sets JT+⊥,JT+− of the tensor current JTuv . As in our recent analysis of f−q2, we show that fTq2 obtained from the two different sets of the current components gives the identical result in the valence region of the q+=0 frame without involving the explicit zero modes and the instantaneous contributions. The implications of the zero modes and the instantaneous contributions are also discussed in comparison between the manifestly covariant model and the standard LFQM. In our numerical calculations, we obtain the q2-dependent form factors (f±,fT) for D⟶πK and branching ratios for the semileptonic D⟶πKℓvℓℓ=e,μ decays. Our results show in good agreement with the available experimental data as well as other theoretical model predictions.
format	article
author	Ho-Meoyng Choi
author_facet	Ho-Meoyng Choi
author_sort	Ho-Meoyng Choi
title	Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
title_short	Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
title_full	Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
title_fullStr	Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
title_full_unstemmed	Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model
title_sort	current-component independent transition form factors for semileptonic and rare d⟶πk decays in the light-front quark model
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/448b1eeb6542480eb2dfcf6ca5846c8d
work_keys_str_mv	AT homeoyngchoi currentcomponentindependenttransitionformfactorsforsemileptonicandraredpkdecaysinthelightfrontquarkmodel
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Current-Component Independent Transition Form Factors for Semileptonic and Rare D⟶πK Decays in the Light-Front Quark Model

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