-
In this work, the authors use the effective Lagrangian method to investigate the production of singly charm pentaquark state with spin parity $J ^ P={1/2}^{-} $ . Based on the possible molecular state images of hadrons, the author discusses the production of singly charm pentaquark state${c\bar suud}$ and decuplet baryon$\overline \Delta$ by$B_s$ meson with different molecular state configurations of$ND_s $ or$ND ^ * _s $ . To determine the coupling between pentaquark and their constituents in the molecular scheme, the authors follow the Weinberg compositeness condition to estimate the self-energy diagram of the singly charmed pentaquark. Further study on the production of pentaquark from$B_s$ meson can be propeled by computing the transition matrix elements, or the triangle diagrams, which can be careful divided into two part subprocess, one associated with weak transition can be represented into form factor and decay constant, another one related to strong coupling of hadrons can be described by effective Lagrangian. Selecting the scale parameter α($10 \sim200 $ MeV) and binding energy ε($5,20,50 $ MeV), the authors can find the branching ratio of the production$\overline B_s \to P_ {c\bar {s}}\overline \Delta $ . Under the configuration of$ND_s$ molecule, the branching ratio of the Cabibbo allowed process$\overline B_s \rightarrow P_{c \bar{s}} \overline \Delta$ can reach to order of$10^{-5}$ . Moreover, the production branching ratio of$ND^*_s$ molecule is only at the order of$10^{-8}$ .A increasing scale parameter α can significantly improve the production branching ratio of the singly charm pentaquark. In addition, the binding energy and the coupling constants will also affect the magnitude of production. Therefore, considering the above factors, the production branching ratio of singly charm pentaquark in $B_s$ decays have considerable results, which is worth experimental and theoretical research in the future. The findings of our work can provide a reference for the experimental search and study of singly charm pentaquark, and it is hoped that they will be verified in future experimental detections at b factories such as LHCb, Belle, and BaBar.-
Keywords:
- singly charm pentaquark /
- branching ratio /
- effective Lagrangian
-
图 2 $ \overline B_s $介子产生单粲五夸克的三角图. (a-b) 具有$ ND_s $分子态构型的单粲五夸克; (c-d) 具有$ ND^*_s $分子态构型的单粲五夸克
Figure 2. The triangle diagrams of singly charm pentaquark produced by $ \overline B_s $ meson. (a-b) singly charm pentaquark with $ ND_s $ molecular state configuration; (c-d) singly charm pentaquark with $ ND^*_s $ molecular state configuration.
图 4 $ \overline B_s \xrightarrow[]{N} P_{c \bar{s}} \overline \Delta $的分支比随参数α的变化曲线 (a) $ P_{c \bar{s}} $为$ ND_s $分子态; (b) $ P_{c \bar{s}} $为$ N{D^*_s} $分子态
Figure 4. The branching ratios of $ \overline B_s \xrightarrow[]{N} P_{c \bar{s}} \overline \Delta $ vary with the parameter α: (a) $ P_{c \bar{s}} $ as hadronic molecule $ ND_s $; (b) $ P_{c \bar{s}} $ as hadronic molecule $ ND^*_s $
表 1 形状因子$ F_{1}(k^2) $, $ F_{2}(k^2) $和$ A_i(k^2) $(i = 1, 2, 3)的拟合展开参数$ a_i $和$ m_{pole} $[33,34]
Table 1. The fitted parameters $ a_i $ and pole mass $ m_{pole} $ of form factors $ F_{1}(k^2) $, $ F_{2}(k^2) $ and $ A_i(k^2) $(i = 1, 2, 3).
参数 $ {\overline B_s\to D} $ $ {\overline B_s\to D^*} $ $ F_1(k_1) $ $ F_2(k_1) $ $ A_{0}(k_1) $ $ A_{1}(k_1) $ $ A_{2}(k_1) $ $ A_{3}(k_1) $ $ a_{0} $ $ 0.666 $ $ 0.666 $ $ 0.100 $ $ 0.105 $ $ 0.055 $ $ 0.059 $ $ a_{1} $ $ -0.206 $ $ -3.236 $ $ -0.180 $ $ -0.430 $ $ -0.010 $ $ -0.110 $ $ a_{2} $ $ -0.106 $ $ -0.075 $ $ -0.006 $ $ -0.100 $ $ -0.030 $ $ -0.250 $ $ a_{3} $ $ 0.00 $ $ -0.00 $ $ 0.00 $ $ -0.030 $ $ 0.060 $ $ -0.050 $ $ m_{pole} $/GeV $ — $ $ — $ $ 6.335 $ $ 6.275 $ $ 6.745 $ $ 6.745 $ 表 2 单粲味五夸克态的产生分支比(α = 100 MeV)
Table 2. The production branching ratio of singly charm pentaquark state (α = 100 MeV).
分子态 产生道 分支比($ \times 10^{-6} $) $ \varepsilon $/MeV 5 20 50 $ ND_s $ $ \overline B_s \xrightarrow[]{N} P_{c \bar{s}} \overline \Delta $ 29.40 31.37 24.51 $ \overline B_s\xrightarrow[]{N} P_{c \bar{s}}(\to \Lambda_c K) \overline \Delta $ $ 0.223 $ 0.194 0.137 $ ND^*_s $ $ \overline B_s\xrightarrow[]{N} P_{c \bar{s}} \overline \Delta $ 0.055 $ 0.408 $ 1.570 $ \overline B_s\xrightarrow[]{N} P_{c \bar{s}}(\to \Lambda_c K) \overline \Delta $ $ 0.0006 $ 0.0041 0.0157 $ \overline B_s\xrightarrow[]{N} P_{c \bar{s}}(\to \Sigma_c K) \overline \Delta $ $ 0.0004 $ 0.0024 0.0072 $ \overline B_s\xrightarrow[]{N} P_{c \bar{s}}(\to p D_s) \overline \Delta $ 0.0002 0.0015 0.0050 -
[1] Aa ij, Roel and others 2015 Phys. Rev. Lett. 115 072001Google Scholar
[2] Aa ij, Roel and others 2019 Phys. Rev. Lett. 122 222001Google Scholar
[3] Aa ij, Roel and others 2021 Sci. Bull. 66 1278Google Scholar
[4] Aa ij, Roel and others 2022 Phys. Rev. Lett. 128 062001Google Scholar
[5] Santopinto, Elena, Giachino, Alessandro 2017 Phys. Rev. D 96 014014Google Scholar
[6] Deng C R, Ping J L, Huang H X, Wang F 2017 Phys. Rev. D 95 014031Google Scholar
[7] Azizi K, Sarac Y, Sundu H 2023 Phys. Rev. D 107 014023Google Scholar
[8] Chen R, Liu X, Li X Q, Zhu S L 2015 Phys. Rev. Lett. 115 132002Google Scholar
[9] Guo F K, Mei?ner Ulf-G, Wang W, Yang Z 2015 Phys. Rev. D 92 071502Google Scholar
[10] Branz Tanja, Gutsche Thomas, Lyubovitskij Valery E 2021 Phys. Rev. D 104 114028Google Scholar
[11] Giron, Jesse F, Lebed, Richard F 2022 Phys. Rev. D 106 074007Google Scholar
[12] Zhang Y, He G Z, Ye Q X, Y D C, Hua J, Wang Q 2024 Chin. Phys. Lett. 41 021301Google Scholar
[13] Chen H X, Chen W Z, Shi L 2019 Phys. Rev. D 100 051501Google Scholar
[14] Liu M Z, Pan Y W, Peng F Z, Sánchez Sánchez Mario, Geng L S, Hosaka Atsushi, Pavon Valderrama Manuel 2019 Phys. Rev. Lett. 122 242001Google Scholar
[15] Zhu J T, Kong S Y, He J 2023 American Physical Society 107 034029
[16] Wu Q, Chen D Y 2019 Phys. Rev. D 100 114002Google Scholar
[17] Peng F Z, Yan M J, Sánchez Sánchez Mario, Valderrama Manuel Pavon 2021 Eur. Phys. J. C 81 666Google Scholar
[18] Xiao C W, Wu J J, Zou B S 2021 Phys. Rev. D 103 054016Google Scholar
[19] Lu J X, Liu M Z, Shi R X, Geng L S 2021 Phys. Rev. D 104 034022Google Scholar
[20] Wu Q, Chen D Y, Ji R 2021 Chin. Phys. Lett. 38 071301Google Scholar
[21] 叶全兴, 何广朝, 王倩 2023 物理学报 72 201401Google Scholar
Geng T, Yan S B, Wang Y H, Yang H J, Zhang T C, Wang J M 2023 Acta Phys. Sin. 72 201401Google Scholar
[22] Shi P P, Baru Vadim, Guo F K, Hanhart Christoph, Nefediev Alexey 2024 Chin. Phys. Lett. 41 031301Google Scholar
[23] Li N, Xing Y, Hu X H 2023 Eur. Phys. J. C 83 1013Google Scholar
[24] Huang Y, Xiao C J, Lü Q F, Wang R, He J, Geng L S 2018 Phys. Rev. D 97 094013Google Scholar
[25] Zhu H Q, Ma N N, Huang Y 2020 Eur. Phys. J. C 80 1184Google Scholar
[26] Yan Y, Hu X H, Huang H X, Ping J L 2023 Phys. Rev. D 108 094045Google Scholar
[27] Xin Q, Yang X, Wang Z G 2023 Int. J. Mod. Phys. A 38 2350123Google Scholar
[28] Yan M J, Peng F Z, Pavon Valderrama Manuel 2024 Phys. Rev. D 109 014023Google Scholar
[29] Steven Weinberg 1963 Phys. Rev. 130 776Google Scholar
[30] American Physical Society 2009 Phys. Rev. D 79 014035Google Scholar
[31] Xiao C J, Huang Y, Dong Y B, Geng L S, Chen D Y 2019 Phys. Rev. D 100 014022Google Scholar
[32] Shen C W, Wu J J, Zou B S 2019 Phys. Rev. D 100 056006Google Scholar
[33] McLean E., Davies C. T. H., Koponen, J., Lytle, A. T. 2020 Phys. Rev. D 101 074513Google Scholar
[34] Harrison Judd, Davies, Christine T. H. 2022 Phys. Rev. D 105 094506
[35] Heng H Y 1997 Phys. Rev. D 56 2799Google Scholar
[36] Gutsche, Thomas and Ivanov, Mikhail A. and Körner, Jürgen G. and Lyubovitskij, Valery E, Santorelli Pietro, Habyl Nurgul 2015 Phys. Rev. D 91 074001Google Scholar
[37] Wu S M, Wang F, Zou B S 2023 Phys. Rev. C 108 045201
[38] Yalikun Nijiati, Zou B S 2022 Phys. Rev. D 105 094026Google Scholar
[39] Li H N, Lu C D, Yu F S 2012 Phys. Rev. D 86 036012Google Scholar
[40] Xing Y, Xing Z P 2019 Chin. Phys. C 43 073103Google Scholar
[41] Xu Y J, Cui C Y, Liu Y L, Huang M Q 2020 Phys. Rev. D 102 034028Google Scholar
Metrics
- Abstract views: 221
- PDF Downloads: 4
- Cited By: 0