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- W2023360448 abstract "Using new experimental data on the leptonic mass spectrum of B->pi l nu, we simultaneously determine |V_ub| and constrain a_2^pi and a_4^pi, the first two Gegenbauer moments of the pion's leading-twist distribution amplitude. We find |V_ub| = (3.2pm 0.1pm 0.1pm 0.3) 10^-3, where the first error is experimental, the second comes from the shape of the form factor in q^2 and the third is a 8% uncertainty from the normalisation of the form factor. We also find a_2^pi(1 GeV)=0.19pm 0.19 and a_4^pi(1 GeV)geq -0.07." @default.
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- W2023360448 date "2005-10-01" @default.
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- W2023360448 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mo stretchy=false>|</mml:mo><mml:msub><mml:mi>V</mml:mi><mml:mrow><mml:mi>u</mml:mi><mml:mi>b</mml:mi></mml:mrow></mml:msub><mml:mo stretchy=false>|</mml:mo></mml:math> and constraints on the leading-twist pion distribution amplitude from <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si2.gif overflow=scroll><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>π</mml:mi><mml:mi>ℓ</…" @default.
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- W2023360448 doi "https://doi.org/10.1016/j.physletb.2005.08.070" @default.
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