First Measurement of the Decay Asymmetry in the Pure 
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-Boson-Exchange Decay 
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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. L.; Fang, J.; Fang, S. S.; Fang, W. X.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Fischer, K.; Fritsch, M.; Fritzsch, C.; Fu, C. D.; Fu, J. L.; Fu, Y. W.; Gao, H.; Gao, Y. N.; Gao, Yang; Garbolino, S.; Garzia, I.; Ge, P. T.; Ge, Z. W.; Geng, C.; Gersabeck, E. M.; Gilman, A.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Gramigna, S.; Greco, M.; Gu, M. H.; Guan, C. Y.; Guan, Z. L.; Guo, A. Q.; Guo, L. B.; Guo, M. J.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Han, T. T.; Han, W. Y.; Hao, X. Q.; Harris, F. A.; He, K. K.; He, K. L.; Heinsius, F. H. H.; Heinz, C. H.; Heng, Y. K.; Herold, C.; Holtmann, T.; Hong, P. C.; Hou, G. Y.; Hou, X. T.; Hou, Y. R.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, K. X.; Huang, L. Q.; Huang, X. T.; Huang, Y. P.; Hussain, T.; Hüsken, N.; Imoehl, W.; Jackson, J.; Jaeger, S.; Janchiv, S.; Jeong, J. H.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Ji, Y. Y.; Jia, X. Q.; Jia, Z. K.; Jiang, H. J.; Jiang, P. C.; Jiang, S. S.; 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Ping, R. G.; Plura, S.; Pogodin, S.; Prasad, V.; Qi, F. Z.; Qi, H.; Qi, H. R.; Qi, M.; Qi, T. Y.; Qian, S.; Qian, W. B.; Qiao, C. F.; Qin, J. J.; Qin, L. Q.; Qin, X. P.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Qu, S. Q.; Redmer, C. F.; Ren, K. J.; Rivetti, A.; Rodin, V.; Rolo, M.; Rong, G.; Rosner, Ch.; Ruan, S. N.; Salone, N.; Sarantsev, A.; Schelhaas, Y.; Schoenning, K.; Scodeggio, M.; Shan, K. Y.; Shan, W.; Shan, X. Y.; Shangguan, J. F.; Shao, L. G.; Shao, M.; Shen, C. P.; Shen, H. F.; Shen, W. H.; Shen, X. Y.; Shi, B. A.; Shi, H. C.; Shi, J. L.; Shi, J. Y.; Shi, Q. Q.; Shi, R. S.; Shi, X.; Song, J. J.; Song, T. Z.; Song, W. M.; Song, Y. J.; Song, Y. X.; Sosio, S.; Spataro, S.; Stieler, F.; Su, Y. J.; Sun, G. B.; Sun, G. X.; Sun, H.; Sun, H. K.; Sun, J. F.; Sun, K.; Sun, L.; Sun, S. S.; Sun, T.; Sun, W. Y.; Sun, Y.; Sun, Y. J.; Sun, Y. Z.; Sun, Z. T.; Tan, Y. X.; Tang, C. J.; Tang, G. Y.; Tang, J.; Tang, Y. A.; Tao, L. Y.; Tao, Q. T.; Tat, M.; Teng, J. X.; Thoren, V.; Tian, W. H.; Tian, W. H.; Tian, Y.; Tian, Z. F.; Uman, I.; Wang, S. J.; Wang, B.; Wang, B. L.; Wang, Bo; Wang, C. W.; Wang, D. Y.; Wang, F.; Wang, H. J.; Wang, H. P.; Wang, J. P.; Wang, K.; Wang, L. L.; Wang, M.; Wang, Meng; Wang, S.; Wang, S.; Wang, T.; Wang, T. J.; Wang, W.; Wang, W.; Wang, W. P.; Wang, X.; Wang, X. F.; Wang, X. J.; Wang, X. L.; Wang, Y.; Wang, Y. D.; Wang, Y. F.; Wang, Y. H.; Wang, Y. N.; Wang, Y. Q.; Wang, Yaqian; Wang, Yi; Wang, Z.; Wang, Z. L.; Wang, Z. Y.; Wang, Ziyi; Wei, D.; Wei, D. H.; Weidner, F.; Wen, S. P.; Wenzel, C. W.; Wiedner, U.; Wilkinson, G.; Wolke, M.; Wollenberg, L.; Wu, C.; Wu, J. F.; Wu, L. H.; Wu, L. J.; Wu, X.; Wu, X. H.; Wu, Y.; Wu, Y. J.; Wu, Z.; Xia, L.; Xian, X. M.; Xiang, T.; Xiao, D.; Xiao, G. Y.; Xiao, S. Y.; Xiao, Y. L.; Xiao, Z. J.; Xie, C.; Xie, X. H.; Xie, Y.; Xie, Y. G.; Xie, Y. H.; Xie, Z. P.; Xing, T. Y.; Xu, C. F.; Xu, C. J.; Xu, G. F.; Xu, H. Y.; Xu, Q. J.; Xu, Q. N.; Xu, W.; Xu, W. L.; Xu, X. P.; Xu, Y. C.; Xu, Z. P.; Xu, Z. S.; Yan, F.; Yan, L.; Yan, W. B.; 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doi:10.1103/physrevlett.132.031801

Phys. Rev. Lett.

2024

DOI: 10.1103/physrevlett.132.031801

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First Measurement of the Decay Asymmetry in the Pure W -Boson-Exchange Decay Λc+→
M. Ablikim,
M. N. Achasov,
P. Adlarson
et al.

Abstract: 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−… Show more

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2024

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Cited by 5 publications

References 38 publications

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Topological diagrammatic approach for charmed baryon decays

Cheng,

Xu,

Zhong

2024

EPJ Web Conf.

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There exist two distinct ways in realizing the approximate SU(3) flavor symmetry of QCD to describe the two-body nonleptonic decays of charmed baryons, the irreducible SU(3) approach (IRA) and the topological diagram approach (TDA). The TDA has the advantage that it is more intuitive, graphic and easier to implement model calculations. We perform a global fit to the experimental data of two-body charmed baryon decays based on the TDA and discuss its equivalence with the IRA and their phenomenological implications.

show abstract

Topological diagrammatic approach for charmed baryon decays

Cheng,

Xu,

Zhong

2024

EPJ Web Conf.

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show abstract

Complete determination of SU(3)F amplitudes and strong phase in Λ
Geng,
He,
Jin
et al. 2024
Phys. Rev. D
5
0
0
0
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The BESIII collaboration has recently reported the first time measurement of the decay asymmetry α(Λc+→Ξ0K+)=0.01±0.16(stat)±0.03(syst) and also a sizable phase shift of δP−δS=−1.55±0.25 or 1.59±0.25 between S- and P-wave amplitudes. This implies significant strong phase shifts in the decay amplitudes. The strong phases indicate the existence of rescattering or loop effects, which are challenging to calculate due to nonperturbative effects. By employing the flavor SU(3)F symmetry and applying the Körner-Pati-Woo theorem to reduce the number of parameters, we find that the current data already allow us to obtain, for the first time, model-independent decay amplitudes and their strong phases. The establishment of the existence of sizable strong phases opens a window for future investigations into CP violation. In our fit, a notable discrepancy emerges in the branching ratio of Ξc0→Ξ−π+. The direct relationship between Γ(Λc+→Λe+νe) and Γ(Ξc0→Ξ−e+νe), along with newly discovered SU(3)F relations, collectively suggests an underestimation of B(Ξc0→Ξ−π+) in experimental findings. Published by the American Physical Society 2024

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Light-cone sum rules study on the purely nonfactorizable Λc+→Ξ0K+ decay

Shi,

Zhao

2024

Phys. Rev. D

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We investigate the purely nonfactorizable Λc+→Ξ0K+ decay using light-cone sum rules. To extract the decay amplitudes, a three-point correlation function is defined and calculated at hadron and quark-gluon level, respectively. Both the W-exchange and the W-inward emission diagrams are considered in the quark-gluon level calculation, where the two-particle light-cone distribution amplitudes (LCDAs) of kaon are used as nonperturbative input. We obtain the decay amplitudes contributed from the twist-2 and twist-3 kaon LCDAs, respectively. The obtained P-wave amplitude is consistent with those predicted in the literature, while the S-wave one is much smaller. This significant difference between the S- and P -wave amplitudes leads to small up-down spin asymmetry, close to the experimental measurement. Published by the American Physical Society 2024

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First Measurement of the Decay Asymmetry in the Pure W -Boson-Exchange Decay Λc+→
M. Ablikim,
M. N. Achasov,
P. Adlarson
et al.

Cited by 5 publications

References 38 publications

Topological diagrammatic approach for charmed baryon decays

Topological diagrammatic approach for charmed baryon decays

Complete determination of SU(3)F amplitudes and strong phase in Λ
Geng,
He,
Jin
et al. 2024
Phys. Rev. D
5
0
0
0
View full text Add to dashboard Cite

Light-cone sum rules study on the purely nonfactorizable Λc+→Ξ0K+ decay

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First Measurement of the Decay Asymmetry in the Pure W -Boson-Exchange Decay Λc+→M. Ablikim, M. N. Achasov, P. Adlarson et al.

Cited by 5 publications

References 38 publications

Topological diagrammatic approach for charmed baryon decays

Topological diagrammatic approach for charmed baryon decays

Complete determination of SU(3)F amplitudes and strong phase in ΛGeng, He, Jin et al. 2024Phys. Rev. D5000View full textAdd to dashboardCite

Light-cone sum rules study on the purely nonfactorizable Λc+→Ξ0K+ decay

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Product

Resources

About

First Measurement of the Decay Asymmetry in the Pure W -Boson-Exchange Decay Λc+→
M. Ablikim,
M. N. Achasov,
P. Adlarson
et al.

Complete determination of SU(3)F amplitudes and strong phase in Λ
Geng,
He,
Jin
et al. 2024
Phys. Rev. D
5
0
0
0
View full text Add to dashboard Cite