This exploratory study computes two-photon decay widths of pseudo-scalar ( ) and scalar ( ) charmonium using two ensembles of twisted mass lattice QCD gauge configurations. The simulation is performed using two lattice ensembles with lattice spacings fm with size and fm with size . The decay widths for the two charmonia are obtained within the expected ballpark, but are however smaller than the experimental ones. Possible reasons for these discrepancies are discussed.
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"full_name": "Chen, Ying"
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"value": " \n\t\t\t\t\t School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China"
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"full_name": "Gong, Ming"
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"value": " \n\t\t\t\t\t School of Science, Xi\u2019an Technological University, Xi\u2019an 710032, China"
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"full_name": "Li, Ning"
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"value": " \n\t\t\t\t\t Collaborative Innovation Center of Quantum Matter, Beijing 100871, China"
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"full_name": "Liu, Chuan"
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"value": " \n\t\t\t\t\t School of Physics, Nankai University, Tianjin 300071, China"
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"full_name": "Liu, Yu-Bin"
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"full_name": "Liu, Zhaofeng"
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"value": " \n\t\t\t\t\t Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China"
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"full_name": "Ma, Jian-Ping"
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"full_name": "Meng, Yu"
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"full_name": "Xiong, Chao"
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"value": " \n\t\t\t\t\t School of Physics, Peking University, Beijing 100871, China"
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"full_name": "Zhang, Ke-Long"
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"title": "Lattice study of two-photon decay widths for scalar and pseudo-scalar charmonium This work is supported in part by the National Science Foundation of China (NSFC) (11335001, 11275169, 11405178, 11935017, 11575196, 11875169, 11775229). It is also supported in part by the DFG and the NSFC (11261130311) through funds provided to the Sino-Germen CRC 110 symmetries and the Emergence of Structure in QCD. This work is also funded in part by National Basic Research Program of China (973 Program) (2015CB856700). M. Gong and Z. Liu are partially supported by the Youth Innovation Promotion Association of CAS (2013013). This work is also supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department (19JK0391) andNatural Science Basic Research Plan in Shaanxi Province of China (2019JM-001)"
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"value": "This exploratory study computes two-photon decay widths of pseudo-scalar (\n\t\t\t\t\t) and scalar (\n\t\t\t\t\t) charmonium using two ensembles of \n\t\t\t\t\t twisted mass lattice QCD gauge configurations. The simulation is performed using two lattice ensembles with lattice spacings \n\t\t\t\t\t fm with size \n\t\t\t\t\t and \n\t\t\t\t\t fm with size \n\t\t\t\t\t. The decay widths for the two charmonia are obtained within the expected ballpark, but are however smaller than the experimental ones. Possible reasons for these discrepancies are discussed.\n\t\t\t\t"
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