First Measurement of the Decay Asymmetry in the pure W-boson-exchange Decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$

Abstract

Based on $4.4{\text{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at the center-of-mass energies between $4.60$ and $4.70\text{GeV}$ with the BESIII detector at the BEPCII collider, the pure \textit{W}-boson-exchange decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be ${\alpha }_{{\Xi }^0{K}^{+}}=0.01\pm 0.16(stat.)\pm 0.03(syst.)$. This result reflects the non-interference effect between the $S$- and $P$-wave amplitudes. The phase shift between $S$- and $P$-wave amplitudes has two solutions, which are ${\delta }_p-{\delta }_s=-1.55\pm 0.25(stat.)\pm 0.05(syst.)\text{rad}$ or $1.59\pm 0.25(stat.)\pm 0.05(syst.)\text{rad}$.

References in corpus (12)

• Charmed Baryon Physics Circa 2021
• Study of the Standard Model with weak decays of charmed hadrons at BESIII
• Luminosities and energies of $e^{+}{e}^{-}$ collision data taken between $\sqrt{s}$=4.612 GeV and 4.946 GeV at BESIII
• Recent Progress in Leptonic and Semileptonic Decays of Charmed Hadrons
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Asymmetries of anti-triplet charmed baryon decays
• Two-body hadronic weak decays of antitriplet charmed baryons
• Tests of $CP$ symmetry in the entangled ${\Xi }^0-{\bar{\Xi }}^0$ Pairs
• Measurement of the Energy-Dependent Electromagnetic Form Factors of a Charmed Baryon
• Weak Decays of Antitriplet Charmed Baryons from the Perspective of Flavor Symmetry
• Topological tensor invariants and the current algebra approach: Analysis of 196 nonleptonic two-body decays of single and double charm baryons -- a review
• Observations of the Cabibbo-Suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, $n{\pi }^{+}{\pi }^{-}{\pi }^{+}$ and the Cabibbo-Favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$

Cited by in corpus (4)

• Remarks on strong phase shifts in weak nonleptonic baryon decays
• Large CP violation in charmed baryon decays
• The nonleptonic decays of double-charmed baryon ${\Omega }_{cc}^{+}$ within the nonrelativistic quark model
• Prospects for $P$ and $CP$ violation in ${\Lambda }_c^{+}$ decays with polarized beam at Super Tau-Charm Facility