Abstract
Measurements of decay asymmetry parameters of charmed baryons, e.g., , provide more data to test the W-emission and W-exchange mechanisms controlled by strong and weak interactions. Taking advantage of the spin polarization in charmed baryon decays, we investigate the possibility to measure weak decay asymmetry parameters in the process. We analyze the transverse polarization spontaneously produced in this process and the spin transfer in the subsequent decays. The sensitivity to measure the asymmetry parameters is estimated for the decay .
Highlights
Evidence for the charmed baryons Ξ+c and Ξ0c were reported for the first time by a hyperon beam experiment at CERN [1] and subsequently confirmed by other experiments [2,3,4,5,6]
The transverse polarization of the charmed baryon makes the subsequent weak decay to become a spin polarimeter, so that its decay asymmetry parameter can be measured by analysing the angular distributions of the decay products
We formulate the polarization in the process e+e− → Ξ0cΞ0c motivated by study the weak asymmetry decay parameters for the Ξc → Ξπ decay
Summary
Evidence for the charmed baryons Ξ+c and Ξ0c were reported for the first time by a hyperon beam experiment at CERN [1] and subsequently confirmed by other experiments [2,3,4,5,6]. Some exclusive decay modes are established by experiment, but its fundamental properties, such as the spin and parity, are still unconfirmed. Their quark contents are assigned as usc for Ξ+c and dsc for Ξ0c baryons. Compared with the charm meson decays, the W -exchange processes are believed to make significant contributions due to the absence of color and helicity suppressions. This argument is confirmed by the recent measurement of the branching fraction of Λ+c → Ξ0K+ [9]. The formulas are applicable to the process e+e− → Ξ+c Ξ−c
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