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Using the CLEO detector at the Cornell Electron Storage Ring, we have studiedthe distribution of kinematic variables in the decay Lambda_c^+ -> Lambda e^+nu_e. By performing a four-dimensional maximum likelihood fit, we determine theform factor ratio, R = f_2/f_1 = -0.31 +/- 0.05(stat) +/- 0.04(syst), the polemass, M_{pole} = (2.21 +/- 0.08(stat) +/- 0.14(syst)) GeV/c^2, and the decayasymmetry parameter of the Lambda_c, alpha_{Lambda_c} = -0.86 +/- 0.03(stat)+/- 0.02(syst), for <q^2> = 0.67 (GeV/c^2)^2. We compare the angulardistributions of the Lambda_c^+ and Lambda_c^- and find no evidence forCP-violation: A_{Lambda_c} = (alpha_{Lambda_c^+} + alpha_{Lambda_c^-})/(alpha_{Lambda_c^+} - alpha_{Lambda_c^-}) = 0.00 +/- 0.03(stat) +/- 0.01(syst)+/- 0.02, where the third error is from the uncertainty in the world average ofthe CP-violating parameter, A_{Lambda}, for Lambda -> p pi^-.

physical review letters

Improved Measurement of the Form Factors in the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo>→</mml:mo><mml:mi>Λ</mml:mi><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub></mml:math>

Improved Measurement of the Form Factors in the DecayΛc+→Λe+νe