Measurement of branching fractions and $CP$ asymmetries in $\mathitΛ_b^0(\mathitΞ_b^0)\!\to pK_{\mathrm S}^0h^-$ decays

A study of $\mathitΛ_b^0$ and $\mathitΞ_b^0$ baryon decays to the final states $pK_{\mathrm S}^0π^-$ and $pK_{\mathrm S}^0K^-$ is performed using $pp$ collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The decays $\mathitΛ_b^0\!\to pK_{\mathrm S}^0K^-$ and $\mathitΞ_b^0\!\to pK_{\mathrm S}^0K^-$ are observed for the first time, with significances reaching eight standard deviations. The branching fractions and integrated $CP$ asymmetries are measured for the $\mathitΛ_b^0\!\to pK_{\mathrm S}^0π^-$, $\mathitΛ_b^0\!\to pK_{\mathrm S}^0K^-$, and $\mathitΞ_b^0\!\to pK_{\mathrm S}^0K^-$ decays. For the decay $\mathitΛ_b^0\!\to pK_{\mathrm S}^0π^-$, the $CP$ asymmetries are measured in different regions of the Dalitz plot. No evidence of $CP$ violation is observed.

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arXiv (Cornell University)
Published
2025-08-25
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Particle physics theoretical and experimental studies
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article

Measurement of branching fractions and $CP$ asymmetries in $\mathitΛ_b^0(\mathitΞ_b^0)\!\to pK_{\mathrm S}^0h^-$ decays

S. Sheng, H.-P. Dembinski, J. Heuel, B. Saitta et al.
arXiv (Cornell University)
Particle physics theoretical and experimental studies
article

Measurement of branching fractions and $CP$ asymmetries in $\mathitΛ_b^0(\mathitΞ_b^0)\!\to pK_{\mathrm S}^0h^-$ decays

S. Sheng, H.-P. Dembinski, J. Heuel, B. Saitta, H. Tilquin, Marie Bachmayer, W. Barter, Dong Xiao, F. Ferrari, Emilio Xose Rodriguez Fernandez, A. Padee, G. Sarpis, S. Borghi, M. Guarise, P. Ilten, Eric F. Wood, G. Tonani, Ö. Özçelik, D. Marangotto, V. Matiunin, M. Stefaniak, A. Grecu, C. Prouvé, W. Baldini, J. Hammerich, H. Schindler, A. Okhotnikov, B. Passalacqua, J. Novoa Fernandez, M. Pló Casasús, R. Matev, A. Schopper, G. Mancinelli, F. Blanc, G. Lanfranchi, David J. Houston, D. S. Mitzel, N. Polukhina, M. Charles, F. Ferreira Rodrigues, R. Quagliani, S. Cali, J. Baptista de Souza Leite, A. Konoplyannikov, L. Toscano, A. Mauri, S. J. Jaimes Elles, D. Nicotra, W. Byczynski, P. Baladrón Rodríguez, H. Pereira Da Costa, M. Zdybał, Zakariya Aliouche, J. J. Back, T. Miralles, Q. Li, F. Borgato, S. Barsuk, Y. Zhao, U. Egede, J. T. Borsuk, A. Pazos Álvarez, M. Pappagallo, Mark Smith, M. Pizzichemi, L. Martinazzoli, A. Biolchini, J. Soto, G. Benane, L. Congedo, C. Betancourt, L. Garrido, A. Merli, T. Rong, M. Chefdeville, R. J. Hunter, A. Lampis, A. Usachov, E. Vilella Figueras, M. Becker, B. Sciascia, Chishuai Wang, O. Kot, J. D. Brandenburg, A. Leflat, I. Gorelov, S. Legotin, W. Morren, B. Fang, Lauren Grace Mackey, E. Rodrigues, Justin Bartz, O. Boente García, P. Carniti, J. Dalseno, C. Fitzpatrick, F. M. Meng, S. Celani, George H. Hallett, X. Dai, A. Zhelezov, Qi Shi, G. Haefeli, A. Chubykin, M. Kreps, Pei‐Rong Li, R. Ribatti, X. Wu, G. Corti, V. Yeroshenko, C. Dong, B. Mitreska, T. Fiutowski, Qiming Liang, S. Belin, Z. Ren, A. Brea Rodríguez, K. Belous, R. I. Rabadán Trejo, A. Boyer, G. A. Vasquez, D. Brundu, K. Klimaszewski, Hongjian Wang, T. Fulghesu, V. Balagura, P. A. Günther, O. Schneider, Y. Amhis, Federico de Benedetti, A. Palano, O. Bezshyyko, A. Massafferri, S. Scherl, G. Cavallero, A. Gilman, E. Graugés, M. Witek, A. Solovev, C. Li, M. Vieites Diaz, M. D. Galati, A. Chernov, Zhengchen Lian, E. Zaffaroni, Domenico Riccardi, M. 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Bitadze, Frank Xiangyu Liu, V. Duk, C. Gotti, C. Trippl, D. Golubkov, G. Wormser, Y. Liu, M. De Serio, Z. Shen, Xiaohan Wang, Jonah Evan Blank, L. Paolucci, Yixiong Zhou, S. Capelli, E. Smith, N. Cooke, A. Dziurda, Medaer Sacha Emile R., P. Ciambrone, Jan de Boer, R. Amalric, P. Albicocco, A. M. Donohoe, Alex Daniel Fernez, Zeqing Mu, M. Fiorini, B. Batsukh, J. A. Rodriguez Lopez, P. K. Resmi, Y. Shimizu, D. Pereima, C. J. Pawley, R. Santacesaria, F. Archilli, D. Pinci, M. Adinolfi, M. Vesterinen, M. Kucharczyk, A. Bay, P. Duda, P. d’Argent, A. Saputi, P. De Simone, G. Galati, Yiyang Ding, Esteban Currás Rivera, J. García Pardiñas, S. Vecchi, Jike Wang, D. Torres Machado, P. Koppenburg, J. F. Marchand, J. F. Sun, R. A. Ruiz Fernandez, S. Klaver, L. Shchutska, S. Neubert, M. R. Kmiec, L. Shekhtman, F. C. R. Bishop, C. Frei, R. Bolzonella, L. Golinka-Bezshyyko, J. Nicolini, M. Saur, E. Aslanides, C. Vrahas, J. Marks, Yujie Li, C. Gaspar, Lanxing Li, Q. Zou, D. Maisuzenko, E. 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Uecker, Eleanor Whiter, Juan Jose Juan Castella, Luca Balzani, Ziyi Wang, Yuan Yuan, Yiwei Liu, Yuhao Wang, Yiming Liu, Xiangwei Yin, Jianyu Zhang, N. Tuning, M. Cattaneo, R. Lefèvre, Weijie Liu, Jianqiao Wang, M. Shapkin, R. Vazquez Gomez, Z. Xu, F. Ratnikov, Kang Yang, Zhicai Zhang, W. Vetens, Han Miao, A. McNab, J. Peng, Yangheng Zheng, Z. Wu, Ge Ma, Liangjun Xu, Jussara de Miranda, Emir Muhammad, Shu Xian, Jiahui Zhuo, Yuxi Gao, Gianfranco Morello, Kate Abigail Richardson, Anthony Correia, R. Cheaib, M. Giovannetti, Y. Wu, A. Loi, X. L. Zhu, T. Colombo, D. Zuliani, Yuge Zhang, S. Kotriakhova, J. Mauricio, C. White, Wenbin Qian, E. Rodríguez Rodríguez, D. J. D. Thompson, Y. X. Song, M. Williams, R. Marchevski, C. Burr, D. Melnychuk, Rui Gao, B. Delaney, S. Filippov, G. Robertson, H. Li, A. Villa, C. Normand, Ming Zeng, Viola Cavallini, Miguel Ramos Pernas, Xueting Yang, Yuxiang Song, Manshu Li, P. Kopciewicz, V. Chulikov, Zewen Chen, A. Ene, Ignacio Bediaga, H. Schmitz, Adam Benjamin Morris, Tiange Li, Camilla de Angelis, V. Franco Lima, Chanka Jayaweera, S. Didenko, Alessandra Gioventù, M. Sarpis, F. L. Souza De Almeida, Charlotte Barbara van Hulse, Lucio Anderlini, Mark Richard James Williams, S. Capelli, Peilian Li, Yuyang Jiang, Michael Joseph Morello, Youhua Yang, V. Romanovskiy, Kristof de Bruyn, Giuseppe Martellotti, Y. Tan, Thomas Christian Senger, Krista Lizbeth Smith, Z. Ajaltouni, Melissa Maria Cruz Torres, S. R. Roy, R. Santacesaria, Miguel Fernandez Gomez, Kai Liu, Stefano de Capua, Richard Morgan Williams, Alessandro Cardini, Yuman Cai, N. K. Watson, O. Steinkamp, P. Vincent, Thierry Gys, N. W. Wang, Edoardo Franzoso, J. A. de Vries, T. Szumlak, L. Eklund, Z. Yang, J. Van Eldik, L. Sestini, M. Andersson, Z. Wang, Shunan Zhang, D. Ao, Shanzhen Chen, Liming Zhang, Marie Helene Schune, Pierluigi Campana, R. A. Ruiz Fernandez, Jialu Wang, Paula Garcia Moreno, Fabio de Vellis, Chiara Lucarelli, J. Wendel, Ao Xu, N. K. 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article en

Abstract

A study of $\mathitΛ_b^0$ and $\mathitΞ_b^0$ baryon decays to the final states $pK_{\mathrm S}^0π^-$ and $pK_{\mathrm S}^0K^-$ is performed using $pp$ collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. The decays $\mathitΛ_b^0\!\to pK_{\mathrm S}^0K^-$ and $\mathitΞ_b^0\!\to pK_{\mathrm S}^0K^-$ are observed for the first time, with significances reaching eight standard deviations. The branching fractions and integrated $CP$ asymmetries are measured for the $\mathitΛ_b^0\!\to pK_{\mathrm S}^0π^-$, $\mathitΛ_b^0\!\to pK_{\mathrm S}^0K^-$, and $\mathitΞ_b^0\!\to pK_{\mathrm S}^0K^-$ decays. For the decay $\mathitΛ_b^0\!\to pK_{\mathrm S}^0π^-$, the $CP$ asymmetries are measured in different regions of the Dalitz plot. No evidence of $CP$ violation is observed.

arXiv (Cornell University)
Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Laboratoire d’Annecy de Physique des Particules (FR), Centre de physique des particules de Marseille (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), CEA Paris-Saclay (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire Leprince-Ringuet (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
Openalex Percentile: Top 88%
Particle physics theoretical and experimental studies
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