Angular analysis of the $e^+ e^- \to D^{(*) \pm} D^{* \mp}$ process near the open charm threshold using initial-state radiation
Belle Collaboration, V. Zhukova, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, P. Behera, B. Bhuyan, J. Biswal, A.… 展开作者
Belle Collaboration, V. Zhukova, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, P. Behera, B. Bhuyan, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, T. Czank, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, A. Garmash, R. Gillard, P. Goldenzweig, O. Grzymkowska, E. Guido, J. Haba, K. Hayasaka, H. Hayashii, M. T. Hedges, W. -S. Hou, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, T. Julius, K. H. Kang, G. Karyan, C. Kiesling, D. Y. Kim, K. T. Kim, S. H. Kim, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, R. Kulasiri, Y. -J. Kwon, J. S. Lange, L. Li, L. Li Gioi, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, M. Nakao, T. Nanut, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, S. L. Olsen, H. Ono, B. Pal, C. -S. Park, C. W. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, C. Pulvermacher, A. Rostomyan, Y. Sakai, M. Salehi, S. Sandilya, T. Sanuki, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, V. Shebalin, T. -A. Shibata, J. -G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, G. Varner, A. Vinokurova, V. Vorobyev, E. Waheed, C. H. Wang, M. -Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, S. Watanuki, E. Won, Y. Yamashita, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
We report a new measurement of the exclusive $e^+ e^- \to D^{(*) \pm} D^{*\mp}$ cross sections as a function of the center-of-mass energy from the $D^{(*) \pm} D^{* \mp}$ threshold through $\sqrt{s}=6.0$ GeV with initial-state radiation. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of $951$ fb$^{-1}$. The accuracy of the cross section measurement is increased by a factor of two over the first Belle study. We perform the first angular analysis of the $e^+ e^- \to D^{* \pm} D^{* \mp}$ process and decompose this exclusive cross section into three components corresponding to the $D^*$ helicities.
Factorization and angular distribution asymmetries in charmful baryonic B decays
我们检验了广义因式分解方法的有效性，并计算了$\bar B^0\to Λ\bar p D^{(*)+}$中有趣的三体重子衰变的角关联。利用从重子$B$衰变中提取的类时重子形状因子，我们得到了与BELLE合作组最近的数据相一致的${\cal B}(\bar B^0\to Λ\bar p D^+,Λ\bar p D^{*+})=(1.85\pm 0.30,2.75\pm 0.24)\times 10^{-5}$，这表明基于因子分解的理论方法仍然有效.对于角分布的不对称性，我们发现${\cal A}_θ(\bar B^0\to Λ\bar p D^+,Λ\bar p D^{*+})=(-0.030\pm 0.002\,,+0.150\pm 0.000)$，这是与目前的测量一致。此外，我们预测，${\cal A}_θ(\bar B^0\to p\bar p D^{0},p\bar p D^{*0})=+0.04\pm 0.01$ .未来在BELLE和LHCb以及super-BELLE上对这些角关联的精确探索对于证明目前在迷人的三体重子衰变中的因式分解方法是重要的。
Effects of a $N^*$ resonance with hidden charm in the $π^- p \to D^- Σ_c^+$ reaction near threshold
利用有效拉格朗日方法研究了阈附近$π^- p \to D^- Σ_c^+$反应中隐魅核激发态$N^*_{c\bar{c}}$的效应。我们分别用$D^{*0}$矢量介子交换和$Σ_c^{++}$中间态计算了$t$和$u$通道的背景贡献。我们表明，考虑一个$N^*_{c\bar{c}}$共振提供了一个增强的总截面接近反应阈值。我们还评估了不同能量的微分截面，我们研究了角度依赖性。预计我们的模型计算将在未来的实验中进行测试。
Towards clarifying the possibility of observation of the LHCb hidden-charm pentaquarks $P_{c}^+(4312)$, $P_{c}^+(4337)$, $P_{c}^+(4440)$ and $P_{c}^+(4457)$ in near-threshold charmonium photoproduction off protons and nuclei
On the possibility of testing the two-peak structure of the LHCb hidden-charm strange pentaquark $P_{cs}(4459)^0$ in near-threshold antikaon-induced charmonium production on protons and nuclei
An alternative way to decipher the nature of the doubly charmed tetraquark $T_{cc}(3875)^+$: its antiparticle $T_{{\bar c}{\bar c}}(3875)^-$ photoproduction off nuclei near threshold
