First observation of and evidence of
Collaboration
11 pages
Published in:
- Phys.Rev.D 109 (2024) 3, 032003
- Published: Feb 1, 2024
e-Print:
- 2311.12903 [hep-ex]
DOI:
- 10.1103/PhysRevD.109.032003 (publication)
Experiments:
View in:
Citations per year
Abstract: (APS)
We present the first observation of the singly Cabibbo-suppressed decay with a significance of and the first evidence of decay with a significance of , based on annihilation data recorded by the BESIII detector at the BEPCII collider. The data correspond to an integrated luminosity of , in the center-of-mass energy range from 4.600 to 4.950 GeV. We determine the branching fractions of and relative to their Cabibbo-favored counterparts to be and , respectively. Moreover, by combining our measured result with the world average of , we obtain the branching fraction . This result significantly departs from theoretical predictions based on quark flavor symmetry, which is underpinned by the presumption of meson pair -wave amplitude dominance.- electron positron: annihilation
- electron positron: colliding beams
- Lambda/c+: hadronic decay
- Lambda/c+: rare decay
- Lambda
- K
- pi
- symmetry: flavor
- Lambda/c+: branching ratio: measured
- branching ratio: ratio: measured
References(36)
Figures(0)
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