Charm physics at BESIII

The study of mesons and baryons which contain at least one charm quark is referred to as open charm physics. It offers the possibility to study up-type quark transitions. Since the c quark can not be treated in any mass limit, theoretical predictions are difficult and experimental input is crucial. BESIII collected large data samples of e(+)e(-) collisions at several charm thresholds. The at-threshold decay topology offers special opportunities to study open charm decays. We present a selection of recent BESIII results. The D-s(+) decay constant is measured using the leptonic decays to mu(+)nu and tau(+)nu. Using the semi-leptonic decays of D-0 and D+ to K e(+)nu(e), and pi e(+)nu(e), a measurement of the form factors f(+)(K) (q(2)) and f(+)(pi)(q(2)) is performed and furthermore, we show preliminary results of a model independent measurement of the strong phase difference between D-0 and (D) over bar (0) in the channel D-0 -> K-s(0)pi(+)pi(-) which is an experimental input to the measurement of the CKM angle gamma/phi(3).