title: Could the X(3915) and the X(3930) Be the Same Tensor State?
abstract: By using a combined amplitude analysis of the γγ→DD̅ and γγ→J/ψω data, we demonstrate that the X(3915), which is quoted as a J(PC)=0(++) state in the Particle Data Group table, is favored by the data to be a J(PC)=2(++) state appearing in both channels, which means that the X(3915) and the X(3930) can be regarded as the same J(PC)=2(++) state. Meanwhile, the data also prefer a large helicity-0 contribution of this tensor resonance to the amplitudes instead of the helicity-2 dominance assumed by BABAR, which may indicate a sizable portion of non-qq̅ components in this state. Identifying the X(3915) with the X(3930) and abandoning the helicity-2 dominance for this tensor state are helpful for the further understandings of the properties of this state and also of the mysterious "XYZ" charmoniumlike resonances.
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, People's Republic of China.|State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.|Interdisciplinary Center for Theoretical Study, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Zhiguang
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, People's Republic of China.|State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Hai-Qing
authors.initials: HQ
authors.lastname: Zhou