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4,649 results on '"Guo, Ya"'

271. Heavy quarkonium wave functions at the origin and excited heavy quarkonium production via top quark decays at the LHC

Author

Liao, Qi-Li and Xie, Guo-Ya

Subjects
High Energy Physics - Phenomenology
Abstract

The value of quarkonium wave function at the origin is an important quantity while studying many physical problems concerning a heavy quarkonium. This is because that it is widely used to evaluate the production and decay amplitudes of the heavy quarkonium within the effective filed theory framework, e.g., the non-relativistic QCD (NRQCD). In this paper, the value of the Schr${\rm \ddot{o}}$dinger radial wave function or its first nonvanishing derivative at zero quark-antiquark separation, i.e., $|(|c\bar{c})[n]\rangle$-, $|(|b\bar{c})[n]\rangle$-, and $|(b\bar{b})[n]\rangle$-quarkonium, have been tabulated under five potential models with new parameters of the heavy quarkonium. Moreover, the production of the lower-level Fock states $|(b\bar{Q})[1S]\rangle$ and $|(b\bar{Q})[1P]\rangle$, together with the higher excited Fock states $|(b\bar{Q})[nS]\rangle$ and $|(b\bar{Q})[nP]\rangle$ ($Q$ stands for $c$- or $b$-quark; $n=2,\cdots,6 $) through top quark decays have been studied with the new values of heavy quarkonium wave functions at the origin under the framework of NRQCD. At the LHC with the luminosity ${\cal L}\propto 10^{34}cm^{-2}s^{-1}$ and the center-of-mass energy $\sqrt{S}=14$ TeV, sizable heavy quarkonium events can be produced through top quark decays, i.e., $4 \times10^5$ $B_c$ and $B^*_c$, and $2 \times10^4$ $\eta_b$ and $\Upsilon$ events per year can be obtained according to our calculation., Comment: 12 pages,11 figures. arXiv admin note: text overlap with arXiv:1011.5961 by other authors

Published
2014
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280. Size effect on deformation twinning at the nanoscale in hcp metals

Author

Guo, Ya-Fang, Xu, Shuang, Tang, Xiao-Zhi, Wang, Yue-Sheng, and Yip, Sidney

Subjects
Condensed Matter - Materials Science
Abstract

Deformation twinning is generally considered to be the primary mechanism for hexagonal close-packed (hcp) metals due to their limited slip systems. Recent microcompression experiments on hcp metals point to intriguing strong size effects on twinning mechanisms, indicating that pyramidal slips dominate compression.In this work we analyze size effects on twinning due to lattice-rotation strain in hcp single crystals. A criterion for deformation twinning is derived at the nanoscale and tested by molecular dynamics simulations of magnesium and titanium single crystals. The results show pyramidal slip dominates the compression deformation at the nanoscale, consistent with experimental observations as well as our analysis. Our finding clarifies the nature of size effects in deformation twinning, while also providing an explanation for the so-called strength differential (SD) effect., Comment: 13 pages, 7 figures

Published
2013
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281. SLE non-coding genetic risk variant determines the epigenetic dysfunction of an immune cell specific enhancer that controls disease-critical microRNA expression

Author

Hou, Guojun, Harley, Isaac T. W., Lu, Xiaoming, Zhou, Tian, Xu, Ning, Yao, Chao, Qin, Yuting, Ouyang, Ye, Ma, Jianyang, Zhu, Xinyi, Yu, Xiang, Xu, Hong, Dai, Dai, Ding, Huihua, Yin, Zhihua, Ye, Zhizhong, Deng, Jun, Zhou, Mi, Tang, Yuanjia, Namjou, Bahram, Guo, Ya, Weirauch, Matthew T., Kottyan, Leah C., Harley, John B., and Shen, Nan

Published
2021
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283. The order and logic of CD4 versus CD8 lineage choice and differentiation in mouse thymus

Author

Karimi, Mohammad M., Guo, Ya, Cui, Xiaokai, Pallikonda, Husayn A., Horková, Veronika, Wang, Yi-Fang, Gil, Sara Ruiz, Rodriguez-Esteban, Gustavo, Robles-Rebollo, Irene, Bruno, Ludovica, Georgieva, Radina, Patel, Bhavik, Elliott, James, Dore, Marian H., Dauphars, Danielle, Krangel, Michael S., Lenhard, Boris, Heyn, Holger, Fisher, Amanda G., Štěpánek, Ondřej, and Merkenschlager, Matthias

Published
2021
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