First branching fraction measurement of the suppressed decay $\Xi_c^0\to \pi^-\Lambda_c^+$ - INSPIRE

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First branching fraction measurement of the suppressed decay $\Xi_c^0\to \pi^-\Lambda_c^+$

LHCb

Collaboration

Jul 23, 2020

11 pages

Published in:

Phys.Rev.D 102 (2020) 7, 071101

Published: Oct 13, 2020

e-Print:

2007.12096 [hep-ex]

DOI:

10.1103/PhysRevD.102.071101

PDG:

{{\mathit \Xi}_{{{c}}}^{+}}

\rightarrow

{{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}

Report number:

CERN-EP-2020-129,
LHCb-PAPER-2020-016

Experiments:

CERN-LHC-LHCb

View in:

reference search37 citations

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Abstract: (APS)

The Ξc0 baryon is unstable and usually decays into charmless final states by the c→sud¯ transition. It can, however, also disintegrate into a π- meson and a Λc+ baryon via s quark decay or via cs→dc weak scattering. The interplay between the latter two processes governs the size of the branching fraction B(Ξc0→π-Λc+), first measured here to be (0.55±0.02±0.18)%, where the first uncertainty is statistical and second systematic. This result is compatible with the larger of the theoretical predictions that connect models of hyperon decays using partially conserved axial currents and SU(3) symmetry with those involving the heavy-quark expansion and heavy-quark symmetry. In addition, the branching fraction of the normalization channel, B(Ξc+→pK-π+)=(1.135±0.002±0.387)% is measured.

Note:

Sixteen pages and three figures. All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-016.html (LHCb public pages)

experimental results
LHC-B
Xi/c0: branching ratio
heavy quark: symmetry
hyperon: decay
symmetry: SU(3)
statistical
current: axial
Xi/c0 --> pi- Lambda/c+
Xi/c+ --> p K- pi+

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