Measurements of branching fractions and form factors in the decays D(0 as an exponent) going to p(- as the exponent)-positron-v and D(+ as the exponent) going to p(0 as an exponent)-positron-v

Junyan Ge, Purdue University

Abstract

Using the entire CLEO-c psi(3770) to DDbar event sample, corresponding to an integrated luminosity of 818 pb -1 and approximately 5.4 x 10 6 DDbarevents, we measure the form factors for the decays D0 to rho- e+ nu_e and D+ to rho0 e+ nu_e for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be: V(0)/A_1(0) = 1.48 +- 0.15 +- 0.05 and A_2(0)/A_1(0)= 0.83 +- 0.11 +- 0.04. Assuming CKM unitarity, the known D meson lifetimes and our measured branching fractions we obtain the form factor normalizations A_1(0), A_2(0), and V(0). We also present a measurement of the branching fraction for D + to omega e + nu_e with improved precision.

Degree

Ph.D.

Advisors

Shipsey, Purdue University.

Subject Area

Particle physics

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