Heavy-to-light scalar form factors from Muskhelishvili-Omnes dispersion relations

doi:10.1140/epjc/s10052-018-5790-4

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	Heavy-to-light scalar form factors from Muskhelishvili-Omnes dispersion relations
	Guo, FK ; Yao, DL ; Fernandez-Soler, P ; Albaladejo, M ; Nieves, J
刊名	EUROPEAN PHYSICAL JOURNAL C
	2018
卷号	78 期号:4 页码:310
关键词	UB-VERTICAL-BAR MESON RESONANCES QUARK-MODEL DECAYS ENERGY STRANGENESS
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-018-5790-4
英文摘要	By solving the Muskhelishvili-Omnes integral equations, the scalar form factors of the semileptonic heavy meson decays D -> pi(l) over bar nu(l), D -> (K) over bar(l) over bar nu(l), (K) over bar -> pi(l) over bar nu(l) and (B) over bar (s) -> Kl (nu) over bar (l) are simultaneously studied. As input, we employ unitarized heavy meson-Goldstone boson chiral coupled-channel amplitudes for the energy regions not far from thresholds, while, at high energies, adequate asymptotic conditions are imposed. The scalar form factors are expressed in terms of Omn\`es matrices multiplied by vector polynomials, which contain some undetermined dispersive subtraction constants. We make use of heavy quark and chiral symmetries to constrain these constants, which are fitted to lattice QCD results both in the charm and the bottom sectors, and in this latter sector to the light-cone sum rule predictions close to q(2)=0 as well. We find a good simultaneous description of the scalar form factors for the four semileptonic decay reactions. From this combined fit, and taking advantage that scalar and vector form factors are equal at q(2)=0, we obtain \|V-cd\| = 0.244 +/- 0.022, \|V-cs\| = 0.945 +/- 0.041 and \|V-ub\| = (4.3 +/- 0.7)x10(-3) for the involved Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. In addition, we predict the following vector form factors at q(2) = 0: \|f(+)(D ->eta)(0)\| = 0.01 +/- 0.05, \|f(+)(Ds ->eta)(0)\| = 0.50 +/- 0.08, \|f(+)(Ds ->eta)(0)\| = 0.73 +/- 0.03 and\|f(+)((B) over bar ->eta)(0)\| = 0.82 +/- 0.08, which might serve as alternatives to determine the CKM elements when experimental measurements of the corresponding differential decay rates become available. Finally, we predict the different form factors above the q(2)-regions accessible in the semileptonic decays, up to moderate energies amenable to be described using the unitarized coupled-channel chiral approach.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22921]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.[Yao, D. -L. 2.Fernandez-Soler, P. 3.Nieves, J.] UV, Inst Invest Paterna, Ctr Mixto, Inst Fis Corpuscular,CSIC, Apartado 22085, Valencia, Spain 4.[Albaladejo, M.] Univ Murcia, Dept Fis, E-30071 Murcia, Spain 5.[Guo, F. -K.] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Zhong Guan Cun East St 55, Beijing 100190, Peoples R China 6.[Guo, F. -K.] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, FK,Yao, DL,Fernandez-Soler, P,et al. Heavy-to-light scalar form factors from Muskhelishvili-Omnes dispersion relations[J]. EUROPEAN PHYSICAL JOURNAL C,2018,78(4):310.
APA	Guo, FK,Yao, DL,Fernandez-Soler, P,Albaladejo, M,&Nieves, J.(2018).Heavy-to-light scalar form factors from Muskhelishvili-Omnes dispersion relations.EUROPEAN PHYSICAL JOURNAL C,78(4),310.
MLA	Guo, FK,et al."Heavy-to-light scalar form factors from Muskhelishvili-Omnes dispersion relations".EUROPEAN PHYSICAL JOURNAL C 78.4(2018):310.