First Measurement of the Decay Asymmetry in the Pure W-Boson-Exchange Decay Λ›c+ → Ξ0K+

• Based on 4.4 fb-1 of e+e- annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with the BESIII detector at the BEPCII collider, the pure W-boson-exchange decay Λc+ → Ξ0K+ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be αΞ0K+ = 0.01 ± 0.16(stat) ± 0.03(syst). This result reflects the noninterference effect between the S- and P-wave amplitudes. The phase shift between S- and P-wave amplitudes has two solutions, which are δp - δs = -1.55 ± 0.25(stat) ± 0.05(syst) rad or 1.59 ± 0.25(stat) ± 0.05(syst) rad.

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NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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