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Fu, Hai-Bing; Zeng, Long1; Lu, Rong1; Cheng, Wei2; Wu, Xing-Gang
The D ->rho semileptonic and radiative decays within the light-cone sum rules
Source PublicationEUROPEAN PHYSICAL JOURNAL C
Language英语
KeywordLONG-DISTANCE HEAVY-QUARK VERTICAL-BAR FORM-FACTORS WEAK DECAYS D-MESONS QCD LATTICE ASTERISK PHYSICS
AbstractThe measured branching ratio of the D meson semileptonic decay D ->rho e+nu e\ which is based on the 0.82fb-1 CLEO data taken at the peak of psi(3770)-69pt} \begin{document}$$\psi (3770)$$\end{document} resonance, disagrees with the traditional SVZ sum rules analysis by about three times. In the paper, we show that this discrepancy can be eliminated by applying the QCD light-cone sum rules (LCSR) approach to calculate the D ->rho transition form factors A1,2(q2) and V(q2). After extrapolating the LCSR predictions of these TFFs to whole q2-region, we obtain 1/|Vcd|2x Gamma(D ->rho e nu e)=(55.45-9.41+13.34)x10-15GeVtimes \Gamma (D \rightarrow \rho e \nu _e) =(55.45<^>{+13.34}_{-9.41})\times 10<^>{-15}similar to\mathrm{GeV}$$\end{document}. Using the CKM matrix element and the D0(D+)ifetime from the Particle Data Group, we obtain B(D0 ->rho-e+nu e)=(1.749-0.297+0.421 +/- 0. 006)x10-3 ) = (1.749<^>{+0.421}_{-0.297}\pm 0.006)\times 10<^>{-3}$$\end{document} and B(D+->rho 0e+nu e)=(2.217-0.376+0.534 +/- 0.015)x10-3 = (2.217<^>{+0.534}_{-0.376}\pm 0.015)\times 10<^>{-3}$$\end{document}, which agree with the CLEO measurements within errors. We also calculate the branching ratios of the two D meson radiative processes and obtain B(D0 ->rho 0 gamma)=(1.744-0.704+0.598)x10-5= (1.744<^>{+0.598}_{-0.704})\times 10<^>{-5}$$\end{document} and B(D+->rho+gamma)=(5.034-0.958+0.939)x10-5) = (5.034<^>{+0.939}_{-0.958})\times 10<^>{-5}$$\end{document}, which also agree with the Belle measurements within errors. Thus we think the LCSR approach is applicable for dealing with the D meson decays.
2020
ISSN1434-6044
Volume80Issue:3Pages:194
Cooperation Status国内
Subject AreaPhysics
MOST Discipline CataloguePhysics, Particles & Fields
DOI10.1140/epjc/s10052-020-7758-4
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27110
CollectionSCI期刊论文
Affiliation1.Guizhou Minzu Univ, Dept Phys, Guiyang 550025, Guizhou, Peoples R China
2.Guizhou Minzu Univ, Inst Particle Phys, Guiyang 550025, Guizhou, Peoples R China
3.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
4.Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China
Recommended Citation
GB/T 7714
Fu, Hai-Bing,Zeng, Long,Lu, Rong,et al. The D ->rho semileptonic and radiative decays within the light-cone sum rules[J]. EUROPEAN PHYSICAL JOURNAL C,2020,80(3):194.
APA Fu, Hai-Bing,Zeng, Long,Lu, Rong,Cheng, Wei,&Wu, Xing-Gang.(2020).The D ->rho semileptonic and radiative decays within the light-cone sum rules.EUROPEAN PHYSICAL JOURNAL C,80(3),194.
MLA Fu, Hai-Bing,et al."The D ->rho semileptonic and radiative decays within the light-cone sum rules".EUROPEAN PHYSICAL JOURNAL C 80.3(2020):194.
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