Analysis of D+ → K¯0e+νe and D+ →π0e+νe semileptonic decays

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Analysis of D+ → K¯0e+νe and D+ →π0e+νe semileptonic decays	652 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1103/PhysRevD.96.012002

Title: Analysis of D+ → K¯0e+νe and D+ →π0e+νe semileptonic decays
Creator: Achasov, M. N.
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Ahmed, S.
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Chelkov, G. A.
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Ablikim, M.
Date: 2017
DOI: 10.1103/PhysRevD.96.012002
Description: Using 2.93 fb−1 of data taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we study the semileptonic decays D+→¯K0e+νe and D+→π0e+νe. We measure the absolute decay branching fractions B(D+→¯K0e+νe)=(8.60±0.06±0.15)×10−2 and B(D+→π0e+νe)=(3.63±0.08±0.05)×10−3, where the first uncertainties are statistical and the second systematic. We also measure the differential decay rates and study the form factors of these two decays. With the values of |Vcs| and |Vcd| from Particle Data Group fits assuming Cabibbo-Kobayashi-Maskawa (CKM) unitarity, we obtain the values of the form factors at q2=0, fK+(0)=0.725±0.004±0.012, and fπ+(0)=0.622±0.012±0.003. Taking input from recent lattice QCD calculations of these form factors, we determine values of the CKM matrix elements |Vcs|=0.944±0.005±0.015±0.024 and |Vcd|=0.210±0.004±0.001±0.009, where the third uncertainties are theoretical.

Created: 06-12-2018

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