  We present a study of two states decaying to Lambda_c^+K^-pi^+ using the
BaBar detector at the SLAC PEP-II asymmetric-energy e^+e^- storage rings. We
use an integrated luminosity of 288.5 fb^{-1} collected at the center-of-mass
energy sqrt{s} = 10.58 GeV, near the peak of the Upsilon(4S) resonance, plus
27.2 fb^{-1} collected approximately 40 MeV below this energy. We search for
the particles Xi_{c}(2980)^+ and Xi_{c}(3077)^+, recently discovered by the
Belle Collaboration, in their decays to Lambda_c^+K^-pi^+, where
Lambda_c^+rightarrow pK^-pi^+. We find a signal with 7.0 sigma significance for
the Xi_c(2980)^+ state with a mass difference with respect to the Lambda_c^+ of
(680.6pm1.9pm1.0) MeV/c^2 (first error is statistical and second error is
systematic). The measured width for this state is (23.6pm2.8pm1.3) MeV, and the
yield is 284pm45pm46 events. We find a signal with 8.6 sigma significance for
the Xi_c(3077)^+ state with a mass difference with respect to the Lambda_c^+ of
(790.0pm0.7pm0.2) MeV/c^2, a width of (6.2pm1.6pm0.5) MeV, and a yield of
204pm35pm12 events. The Xi_{c}(2980)^+ is found to decay resonantly through the
intermediate state Sigma_c(2455)^{++}K^- with 4.9 sigma significance and
non-resonantly to Lambda_c^+K^-pi^+ with 4.1 sigma significance. With 5.8 sigma
significance, the Xi_c(3077)^+ is found to decay resonantly through
Sigma_c(2455)^{++}K^-, and with 4.6 sigma significance, it is found to decay
through Sigma_c(2520)^{++}K^-. The significance of the signal for the
non-resonant decay Xi_c(3077)^+rightarrow Lambda_c^+K^-pi^+ is 1.4 sigma. These
results are preliminary.

High Energy Physics - Experiment