Observation of B0 →p Λ ¯ D (∗)-

(Belle Collaboration)

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report the first observation of the decays B0→pΛ¯D(∗)-. The data sample of 711 fb-1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the (4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0→pΛ¯D- and B0→pΛ¯D∗- to be (25.1±2.6±3.5)×10-6 and (33.6±6.3±4.4)×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 (pΛ¯) system is observed, consistent with that observed in similar B decays.

Original languageEnglish
Article number221803
JournalPhysical Review Letters
Volume115
Issue number22
DOIs
Publication statusPublished - 2015 Nov 24

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decay
factorization
thresholds
augmentation
detectors
predictions
energy

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  • Physics and Astronomy(all)

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Observation of B0 →p Λ ¯ D (∗)-. / (Belle Collaboration).

In: Physical Review Letters, Vol. 115, No. 22, 221803, 24.11.2015.

Research output: Contribution to journalArticle

(Belle Collaboration). / Observation of B0 →p Λ ¯ D (∗)-. In: Physical Review Letters. 2015 ; Vol. 115, No. 22.
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abstract = "We report the first observation of the decays B0→pΛ¯D(∗)-. The data sample of 711 fb-1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the (4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0→pΛ¯D- and B0→pΛ¯D∗- to be (25.1±2.6±3.5)×10-6 and (33.6±6.3±4.4)×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 (pΛ¯) system is observed, consistent with that observed in similar B decays.",
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AU - Chang, Y. Y.

AU - Wang, M. Z.

AU - Abdesselam, A.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

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AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Chobanova, V.

AU - Choi, S. K.

AU - Choi, Y.

AU - Cinabro, D.

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AU - Danilov, M.

AU - Dingfelder, J.

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AU - Drásal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Farhat, H.

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AU - Gabyshev, N.

AU - Ganguly, S.

AU - Garmash, A.

AU - Gillard, R.

AU - Glattauer, R.

AU - Goh, Y. M.

AU - Goldenzweig, P.

AU - Won, Eunil

PY - 2015/11/24

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N2 - We report the first observation of the decays B0→pΛ¯D(∗)-. The data sample of 711 fb-1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the (4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0→pΛ¯D- and B0→pΛ¯D∗- to be (25.1±2.6±3.5)×10-6 and (33.6±6.3±4.4)×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 (pΛ¯) system is observed, consistent with that observed in similar B decays.

AB - We report the first observation of the decays B0→pΛ¯D(∗)-. The data sample of 711 fb-1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the (4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0→pΛ¯D- and B0→pΛ¯D∗- to be (25.1±2.6±3.5)×10-6 and (33.6±6.3±4.4)×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 (pΛ¯) system is observed, consistent with that observed in similar B decays.

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