A Study of Xic(2980)+ and Xic(3077)+
Abstract
We present a study of two states decaying to Lambdac+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 sqrts = 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 Xic(2980)+ and Xic(3077)+, recently discovered by the Belle Collaboration, in their decays to Lambdac+K-pi+, where Lambdac+rightarrow pK-pi+. We find a signal with 7.0 sigma significance for the Xic(2980)+ state with a mass difference with respect to the Lambdac+ of (680.6pm1.9pm1.0) MeV/c2 (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 Xic(3077)+ state with a mass difference with respect to the Lambdac+ of (790.0pm0.7pm0.2) MeV/c2, a width of (6.2pm1.6pm0.5) MeV, and a yield of 204pm35pm12 events. The Xic(2980)+ is found to decay resonantly through the intermediate state Sigmac(2455)++K- with 4.9 sigma significance and non-resonantly to Lambdac+K-pi+ with 4.1 sigma significance. With 5.8 sigma significance, the Xic(3077)+ is found to decay resonantly through Sigmac(2455)++K-, and with 4.6 sigma significance, it is found to decay through Sigmac(2520)++K-. The significance of the signal for the non-resonant decay Xic(3077)+rightarrow Lambdac+K-pi+ is 1.4 sigma. These results are preliminary.
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