Observation of B-0 -> p(Lambda)over-barD(*)(-)
We report the first observation of the decays B-0 -> p (Lambda) over barD()(-). The data sample of 711 fb(-1) used in this analysis corresponds to 772 x 10(6) B (B) over bar pairs, collected at the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe 19.8 sigma and 10.8 sigma excesses of events for the two decay modes and measure the branching fractions of B-0 -> p (Lambda) over barD(-) and B-0 -> p (Lambda) over barD(-) to be (25.1 +/- 2.6 +/- 3.5) x 10(-6) and (33.6 +/- 6.3 +/- 4.4) x 10(-6), respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (p (Lambda) over bar) system is observed, consistent with that observed in similar B decays.
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Chang, Y.-Y., Wang, M.-Z., Abdesselam, A., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Babu, V., Badhrees, I., Bakich, A. M., Barberio, E., Bhuyan, B., Biswal, J., Bobrov, A., Bozek, A., Bracko, M., et al. (2015). Observation of B-0 -> p(Lambda)over-barD(*)(-). Physical Review Letters, 115(22), Article 221803. https://doi.org/10.1103/PhysRevLett.115.221803
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WOS:000365524500005
2015
115
22
221803
REVIEWED
EPFL