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He, Q.; Insler, J.; Muramatsu, H.; Park, C. S.; Thorndike, E. H.; Yang, F.; Coan, T. E.; Gao, Y. S.; Artuso, M.; Blusk, S.; Butt, J.; Li, J.; Menaa, N.; Mountain, R.; Nisar, S.; Randrianarivony, K.; Sia, R.; Skwarnicki, T.; Stone, S.; Wang, J. C.
Physical review letters, 03/2008, Letnik: 100, Številka: 9Journal Article
We present measurements of D{yields}K{sub S}{sup 0}{pi} and D{yields}K{sub L}{sup 0}{pi} branching fractions using 281 pb{sup -1} of {psi}(3770) data at the CLEO-c experiment. We find that B(D{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}) is larger than B(D{sup 0}{yields}K{sub L}{sup 0}{pi}{sup 0}), with an asymmetry of R(D{sup 0})=0.108{+-}0.025{+-}0.024. For B(D{sup +}{yields}K{sub S}{sup 0}{pi}{sup +}) and B(D{sup +}{yields}K{sub L}{sup 0}{pi}{sup +}), we observe no measurable difference; the asymmetry is R(D{sup +})=0.022{+-}0.016{+-}0.018. The D{sup 0} asymmetry is consistent with the value based on the U-spin prediction A(D{sup 0}{yields}K{sup 0}{pi}{sup 0})/A(D{sup 0}{yields}K{sup 0}{pi}{sup 0})=-tan{sup 2}{theta}{sub C}, where {theta}{sub C} is the Cabibbo angle.
