First Measurement of the Decay Asymmetry in the Pure W -Boson-Exchange Decay Λ c + → Ξ 0 K +

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, T. T.; Chang, W. L.; Che, G. R.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Cheng, W. S.; Choi, S. K.; Chu, X.; Cibinetto, G.; Coen, S. C.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Duan, Z. H.; Egorov, P.; Fan, Y. H. Y.; Fan, Y. 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doi:10.1103/PhysRevLett.132.031801

First Measurement of the Decay Asymmetry in the Pure $W$ -Boson-Exchange Decay $Λ_{c}^{+} \to Ξ^{0} K^{+}$

Journal Article · Wed Jan 17 00:00:00 EST 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.031801· OSTI ID:2281633

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E. more »

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 $Λ_{c}^{+} \to Ξ^{0} K^{+}$ is studied with a full angular analysis. The corresponding decay asymmetry is measured for the first time to be $α_{Ξ^{0} K^{+}} = 0.01 \pm 0.16 (stat) \pm 0.03 (syst)$ . 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 $δ_{p} - δ_{s} = - 1.55 \pm 0.25 (stat) \pm 0.05 (syst) rad$ or $1.59 \pm 0.25 (stat) \pm 0.05 (syst) rad$ .

Published by the American Physical Society 2024

View Journal Article

Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2281633

Alternate ID(s):: OSTI ID: 2579647

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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