First measurements of absolute branching fractions of the $\Xi_c^+$ baryon at Belle - INSPIRE

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First measurements of absolute branching fractions of the $\Xi_c^+$ baryon at Belle

Belle

Collaboration

•

Y.B. Li
(
- Peking U.
)

Apr 26, 2019

8 pages

Published in:

Phys.Rev.D 100 (2019) 3, 031101

Published: Aug 14, 2019

e-Print:

1904.12093 [hep-ex]

DOI:

10.1103/PhysRevD.100.031101 (publication)

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\overline{\mathit \Xi}}_{{{c}}}^{-}}{{\mathit \Lambda}_{{{c}}}^{+}}

{{\overline{\mathit \Xi}}_{{{c}}}^{-}}

\rightarrow

{{\overline{\mathit \Xi}}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}

Report number:

KEK Preprint # 2019-3; Belle Preprint # 2019-05,
KEK-Preprint-2019-3,
Belle-Preprint-2019-05

Experiments:

KEK-BF-BELLE

View in:

reference search48 citations

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Abstract: (APS)

We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξ-π+π+ and pK-π+ final states. Our analysis is based on a data set of (772±11)×106 BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider. We measure the absolute branching fraction of B¯0→Λ¯c-Ξc+ with the Ξc+ recoiling against Λ¯c- in B¯0 decays resulting in B(B¯0→Λ¯c-Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10-3. We then measure the product branching fractions B(B¯0→Λ¯c-Ξc+)B(Ξc+→Ξ-π+π+) and B(B¯0→Λ¯c-Ξc+)B(Ξc+→pK-π+). Dividing these product branching fractions by B¯0→Λ¯c-Ξc+ yields B(Ξc+→Ξ-π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pK-π+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξ-π+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξ-π+π+ to set the absolute scale for many Ξc+ branching fractions.

Note:

7 pages, 2 figures, accepted for publication as a Rapid Communication in Physical Review D

14.20.Lq
13.30.Eg
13.25.Hw
electron positron: annihilation
electron positron: colliding beams
B: pair production
anti-B0: hadronic decay
Xi/c+: hadronic decay
anti-B0: branching ratio: measured
Xi/c+: branching ratio: measured

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Figures(9)

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