Observation of the Singly Cabibbo Suppressed Decay 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>n</mml:mi><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Ablikim, M.; Ачасов, М. Н.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I. R.; Briere, R. A.; Cai, H.; Cai, Xinxia; Calcaterra, A.; Cao, G. F.; Cao, N.; Çetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G. A.; Chen, D Y; Chen, G; Chen, H S; Chen, M L; Chen, S J; Chen, X R; Chen, Y B; Chen, Z J; Cheng, W. S.; Cibinetto, G.; Cossio, F.; Cui, X. F.; Dai, H. L.; Dai, J. P.; Dai, X. C.; Dbeyssi, A.; Boer, R. E. de; Dedovich, D. V.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; Mori, F. De; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, S. X.; Egorov, P.; Fan, Y. L.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Fritsch, M.; Fu, C. D.; Gao, Yang; Garzia, I.; Ge, P.; Geng, C.; Gersabeck, E.; Gilman, A.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, L. M.; Gu, M. H.; Guan, C. Y.; Guo, A. Q.; Guo, L. B.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Han, Tao; Han, W. Y.; Hao, X. Q.; Harris, F. A.; He, K. K.; He, K. L.; Heinsius, F. H.; Heinz, C.; Heng, Y. K.; Herold, C.; Himmelreich, M.; Holtmann, T.; Hou, G. Y.; Hou, Y. R.; Hou, Z. L.; Hu, H. M.; Hu, J.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, L. Q.; Huang, X. T.; Huang, Y.; Huang, Z.; Hussain, T.; Hüsken, N.; Andersson, W. Ikegami; Imoehl, W.; Irshad, M.; Jaeger, S.; Janchiv, S.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Ji, Y. Y.; Jiang, H. B.; Jiang, X. S.; Jiao, J. B.; Jiao, Z.; Jin, S.; Jin, Y.; Jing, M. Q.; Johansson, T.; Kalantar‐Nayestanaki, N.; Kang, X. S.; Kappert, R.; Kavatsyuk, M.; Ke, B. C.; Keshk, I. K.; Khoukaz, A.; Kiese, P.; Kiuchi, R.; Kliemt, R.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kuemmel, M.; Kuessner, M.; Kupść, A.; Kurth, M. G.; Kühn, W.; Lane, J. J.; Lange, J. S.; Larin, P.; Lavania, A.; Lavezzi, L.; Lei, Z. H.; Leithoff, H.; Lellmann, M.; Lenz, T.; Li, C; Li, C H; Li, Cheng; Li, D M; Li, F; Li, G; Li, H; Li, H; Li, H B; Li, H J; Li, H N; Li, J L; Li, J Q; Li, J S; Li, Ké; Li, L K; Li, Lei; Li, P R; Li, S Y; Li, W D; Li, X H; Li, X L; Li, Xiaoyü; Li, Z Y; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Liao, L. Z.; Libby, J.; Limphirat, A.; Lin, C. X.; Lin, D. X.; Lin, Tao; Liu, B J; Liu, C X; Liu, D; Liu, F H; Liu, Fang; Liu, Feng; Liu, G M; Liu, H M; Liu, Huanhuan; Liu, Huihui; Liu, J B; Liu, J L; Liu, J Y; Liu, K; Liu, K Y; Liu, Ke; Liu, L; Liu, M H; Liu, P L; Liu, Q; Liu, Q; Liu, S B; Liu, T; Liu, T; Liu, W M; Liu, X; Liu, Y; Liu, Y B; Liu, Z A; Liu, Z Q; Lou, X.; Lu, F. X.; Lü, H. J.; Lu, J. D.; Lu, J. G.; Lu, X. L.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, P. W.; Luo, T.; Luo, X. L.; Lyu, X. R.; C, F; L, H; L, L; M, M; M, Q; Q, R; Ma, R T; X, X; Y, X; Maas, F. E.; Maggiora, M.; Maldaner, S.; Malde, S.; Malik, Q. A.; Mangoni, A.; Mao, Y.; Mao, Z. P.; Marcello, S.; Meng, Z.; Messchendorp, J. G.; Mezzadri, G.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Muchnoi, N. Yu.; Muramatsu, H.; Nakhoul, S.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, X.; Pan, Y.; Pathak, A.; Patterí, P.; Pelizaeus, M.; Peng, H.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Plura, S.; Pogodin, S.; Poling, R.; Prasad, V.; Qi, H. R.; Qi, M.; Qi, T. Y.; Qian, S.; Qian, W.; Qian, Z.; Qiao, C. F.; Qin, J.; Liu, Qin; Qin, X. P.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Qu, S. Q.; Rashid, K. H.; Ravindran, K.; Redmer, C. F.; Rivetti, A.; Rodin, V.; Rolo, M.; Rong, G.; Rosner, Ch.; Rump, M.; Sang, H. S.; Sarantsev, A.; Schelhaas, Y.; Schnier, C.; Schoenning, K.; Scodeggio, M.; Shan, W.; Shan, X. Y.; Shangguan, J. F.; Shao, M.; Shen, C. P.; Shen, H. F.; Shen, X. Y.; Shi, H. C.; Shi, R. S.; Shi, X.; Song, J. J.; Song, W. M.; Song, Y. X.; Sosio, S.; Spataro, S.; Stieler, F.; Su, K. X.; Su, P. P.; Sui, F. F.; Sun, G. X.; Sun, H. K.; Sun, J. F.; Sun, L.; Sun, S. S.; Sun, T.; Sun, W. Y.; Sun, X. H.; Sun, Y. J.; Sun, Y. Z.; Sun, Z. T.; Tan, Y. H.; Tan, Y. X.; Tang, C. J.; Tang, G. Y.; Tang, J.; Teng, J. X.; Thoren, V.; Tian, W. H.; Tian, Y.; Uman, I.; Wang, B; Wang, C W; Wang, D Y; Wang, H J; Wang, H P; Wang, K; Wang, L L; Wang, M; Wang, M Z; Wang, Meng; Wang, S; Wang, W; Wang, W H; Wang, W P; Wang, X; Wang, X F; Wang, X L; Wang, Y; Wang, Y D; Wang, Y F; Wang, Y Y; Wang, Z; Wang, Ziyi; Wang, Zongyuan; Wei, D. H.; Weidner, F.; Wen, S. P.; White, D. J.; Wiedner, U.; Wilkinson, G.; Wolke, M.; Wollenberg, L.; Wu, Jinfei; Wu, L. H.; Wu, L. J.; Wu, X.; Wang, Zhi; Xia, L.; Xiao, H.; Xiao, S. Y.; Xiao, Z. J.; Xie, X. H.; Xie, Y.; Xie, Y.; Xing, T. Y.; Xu, C.; Xu, G. F.; Xu, Q. J.; Xu, Wei; Xu, X. P.; Xu, Y. C.; Yan, F.; Yan, L.; Yan, W. B.; Yan, W. C.; Yang, H. J.; Yang, H. X.; Yang, L.; Yang, S. L.; Yang, Yifan; Yang, Zhi; Ye, M; Ye, M H; Yin, J. H.; Zhou, You; Yu, B. X.; Yu, C. X.; Yu, G.; Yu, Jie; Yu, T.; Yuan, C. Z.; Yuan, L.; Yuan, Y.; Yuan, Z. Y.; Yue, C. X.; Zafar, A. A.; Zeng, X.; Zeng, Y.; Zhang, A Q; Zhang, B X; Zhang, Guangyi; Zhang, H; Zhang, H H; Zhang, H H; Zhang, H Y; Zhang, J L; Zhang, J Q; Zhang, J W; Zhang, Jianyu; Zhang, Jiawei; Zhang, L M; Zhang, L Q; Zhang, Lei; Zhang, S; Zhang, S F; Zhang, Shulei; Zhang, X D; Zhang, X M; Zhang, X Y; Zhang, Y; Zhang, Y T; Zhang, Y H; Zhang, Yan; Zhang, Yao; Zhang, Z Y; Zhao, Gang; Zhao, J.; Zhao, J.; Liu, Zhao; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, Y. B.; Zhao, Y. X.; Zhao, Z.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, Y.; Zhong, B.; Chen, Zhong; Zhou, L.; Zhou, Q.; Zhou, Xiang; Zhou, Xiaorong; Zhou, X. R.; Zhu, A. N.; Zhu, Jing; Zhu, K.; Zhu, S. H.; Zhu, T. J.; Zhu, W. J.; Zhu, Y.; Zhu, Z. A.; Zou, B. S.; Zou, J. H.

doi:10.1103/physrevlett.128.142001

Cited by 16 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many experimental studies of various decays have been reported, with a focus on decays to two-body hadronic final states [11][12][13][14][15][16][17][18][19][20][21]. However, more studies of multi-body hadronic decays are required to gain deeper insight into the nature of non-perturbative QCD, as these involve rich intermediate processes and the branching fractions (BF) are in general higher.…”

Section: J P Zheng(郑建平)mentioning

confidence: 99%

“…The uncertainty due to the MC statistics is 0.1%. The ST yields contribute to the uncertainty of BF by 0.5% [8]. The uncertainties due to the DT yields extraction are 5.7% and 12.4% for Λ + c → pη and Λ + c → pπ 0 , respectively, which is the quadratic sum of the individual changes of signal yields obtained from the alternative fits by changing the fixed parameters in the shapes of the signal and background by ±1σ.…”

mentioning

confidence: 97%

“…Particularly, some SU(3) flavor (SU(3) f ) symmetry models neglected the parameters associated with the W -exchange contributions and predicted the BF of Λ + c → pπ 0 to be around 5 × 10 −4 [6,7], which is significantly greater than the upper limits measured by BESIII [3] and Belle [4] experiments. By combining the results from Belle [4] and BESIII [8], the ratio of the BFs between Λ + c → nπ + and Λ + c → pπ 0 is calculated to be greater than 7.2 at the 90% confidence level. This result unexpectedly conflicts with most theoretical predictions, such as 2.0 with the SU(3) f symmetry [6,7,9], 4.7 with the SU(3) f symmetry including the contribution from O(6) and O(15) [5], 4.5 from the constituent quark model [10], and 3.5 from the dynamical calculation based on the pole model and current algebra [1].…”

mentioning

confidence: 99%

“…Charged tracks, photon candidates as well as the intermediate π 0 , K 0 S , Λ, and Σ0 states are selected and reconstructed using the same criteria described in detail in Ref. [8]. In addition, the kaon candidate is now required to have a particle identification (PID) probability to be a kaon greater than 0.0005, in order to suppress background with pions misidentified as kaons.…”

mentioning

confidence: 99%

“…The selection criteria for charged tracks and photons are the same as those in the ST selection. The distance of the closest approach to the interaction point along the beam direction is required to be less than 10 cm and 20 cm for tight and loose tracks, respectively [8]. In addition, the corresponding distance perpendicular to the beam direction is required to be less than 1 cm for a tight track.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Observations of the Cabibbo-Suppressed decays , and the Cabibbo-Favored decay *

et al. 2023

View full text Add to dashboard Cite

Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5\,\unit{fb}$^{-1}$, collected by the BESIII detector in the energy region between $4600~\mev$ and $4699~\mev$, we report the first observations of the Cabibbo-suppressed decays $\Lambda_c^+\to n\pi^+\pi^0$, $\Lambda_c^+\to n\pi^+\pi^-\pi^+$, and the Cabibbo-favored decay $\Lambda_c^+\to nK^-\pi^+\pi^+$ with statistical significances of $7.9\sigma$, $7.8\sigma$, and $>10\sigma$, respectively. The branching fractions of these decays are measured to be $\mathcal{B}(\Lambda_{c}^{+}\rightarrow n\pi^{+}\pi^{0})=(0.64\pm0.09\pm0.02)\%$, $\mathcal{B}(\Lambda_{c}^{+}\rightarrow n\pi^{+}\pi^{-}\pi^{+})=(0.45\pm0.07\pm0.03)\%$, and $\mathcal{B}(\Lambda_{c}^{+}\rightarrow nK^{-}\pi^{+}\pi^{+})=(1.90\pm0.08\pm0.09)\%$, where the first uncertainties are statistical and the second are systematic. We find that the branching fraction of the decay $\Lambda_{c}^{+}\rightarrow n\pi^{+}\pi^{0}$ is about one order of magnitude higher than that of $\Lambda_{c}^{+}\rightarrow n\pi^{+}$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

show abstract