Comparison of D --> K_s^0 pi and D --> K_L^0 pi Decay Rates

Details Comparison of D --> K_s^0 pi and D --> K_L^0 pi Decay Rates Comparison of D --> K_s^0 pi and D --> K_L^0 pi Decay Rates

2007-11-09

arxiv.org/abs/0711.1463v2

Phys.Rev.Lett.100:091801, 2008

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/, published in PRL, v2 fixes typos an

Scientific paper

10.1103/PhysRevLett.100.091801

We present measurements of D -> K0_S pi and D -> K0_L pi branching fractions using 281 pb-1 of psi(3770) data at the CLEO-c experiment. We find that B(D0 -> K0_S pi0) is larger than B(D0 -> K0_L pi0), with an asymmetry of R(D0) = 0.108 +- 0.025 +- 0.024. For B(D+ -> K0_S pi+) and B(D+ -> K0_L pi+), we observe no measurable difference; the asymmetry is R(D+) = 0.022 +- 0.016 +- 0.018. The D0 asymmetry is consistent with the value based on the U-spin prediction A(D0 -> K0 pi0)/A(D0 -> K0bar pi0) = -tan^2(theta_C), where theta_C is the Cabibbo angle.

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