We present the first measurements of absolute branching fractions of Ξc0 decays into Ξ-π+, ΛK-π+, and pK-K-π+ final states. The measurements are made using a dataset comprising (772±11)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e-collider. We first measure the absolute branching fraction for B-→Λ̄c-Ξc0 using a missing-mass technique; the result is B(B-→Λ̄c-Ξc0)=(9.51±2.10±0.88)×10-4. We subsequently measure the product branching fractions B(B-→Λ̄c-Ξc0)B(Ξc0→Ξ-π+), B(B-→Λ̄c-Ξc0)B(Ξc0→ΛK-π+), and B(B-→Λ̄c-Ξc0)B(Ξc0→pK-K-π+) with improved precision. Dividing these product branching fractions by the result for B-→Λ̄c-Ξc0 yields the following branching fractions: B(Ξc0→Ξ-π+)=(1.80±0.50±0.14)%, B(Ξc0→ΛK-π+)=(1.17±0.37±0.09)%, and B(Ξc0→pK-K-π+)=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξc0→Ξ-π+) can be combined with Ξc0 branching fractions measured relative to Ξc0→Ξ-π+ to yield other absolute Ξc0 branching fractions.

First measurements of absolute branching fractions of the Ξc0 Baryon at Belle / Li, Y.B., Shen, C.P., Yuan, C.Z., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Aushev, T., Ayad, R., Badhrees, I., Ban, Y., Bansal, V., Beleno, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bondar, A., Bozek, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 122:8(2019). [10.1103/PhysRevLett.122.082001]

First measurements of absolute branching fractions of the Ξc0 Baryon at Belle

Merola M.;Pardi S.;Russo G.;
2019

Abstract

We present the first measurements of absolute branching fractions of Ξc0 decays into Ξ-π+, ΛK-π+, and pK-K-π+ final states. The measurements are made using a dataset comprising (772±11)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e-collider. We first measure the absolute branching fraction for B-→Λ̄c-Ξc0 using a missing-mass technique; the result is B(B-→Λ̄c-Ξc0)=(9.51±2.10±0.88)×10-4. We subsequently measure the product branching fractions B(B-→Λ̄c-Ξc0)B(Ξc0→Ξ-π+), B(B-→Λ̄c-Ξc0)B(Ξc0→ΛK-π+), and B(B-→Λ̄c-Ξc0)B(Ξc0→pK-K-π+) with improved precision. Dividing these product branching fractions by the result for B-→Λ̄c-Ξc0 yields the following branching fractions: B(Ξc0→Ξ-π+)=(1.80±0.50±0.14)%, B(Ξc0→ΛK-π+)=(1.17±0.37±0.09)%, and B(Ξc0→pK-K-π+)=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξc0→Ξ-π+) can be combined with Ξc0 branching fractions measured relative to Ξc0→Ξ-π+ to yield other absolute Ξc0 branching fractions.
2019
First measurements of absolute branching fractions of the Ξc0 Baryon at Belle / Li, Y.B., Shen, C.P., Yuan, C.Z., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Aushev, T., Ayad, R., Badhrees, I., Ban, Y., Bansal, V., Beleno, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bondar, A., Bozek, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 122:8(2019). [10.1103/PhysRevLett.122.082001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/915759
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