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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
Phys Rev Lett. 2024 Sep 27;133(13):131902. doi: 10.1103/PhysRevLett.133.131902.
A study of resonant structures in B^{+}→D^{+}D^{-}K^{+} and B^{+}→D^{-}D^{+}K^{+} decays is performed, using proton-proton collision data at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 fb^{-1}. A simultaneous amplitude fit is performed to the two channels with contributions from resonances decaying to D^{-}D^{+} and D^{+}D^{-} states linked by C parity. This procedure allows the C parities of resonances in the D^{±}D^{∓} mass spectra to be determined. Four charmonium or charmoniumlike states are observed decaying into D^{±}D^{∓}: η_{c}(3945), h_{c}(4000), χ_{c1}(4010), and h_{c}(4300), with quantum numbers J^{PC} equal to 0^{-+}, 1^{+-}, 1^{++}, and 1^{+-}, respectively. At least three of these states have not been observed previously. In addition, the existence of the T_{c[over ¯]s[over ¯]0}^{}(2870)^{0} and T_{c[over ¯]s[over ¯]1}^{}(2900)^{0} resonances in the D^{-}K^{+} mass spectrum, already observed in the B^{+}→D^{+}D^{-}K^{+} decay, is confirmed in a different production channel.
利用大型强子对撞机底夸克实验（LHCb实验）记录的质心能量为(\sqrt{s}=7)、(8)和(13) TeV的质子-质子碰撞数据（对应积分亮度为(9,\text{fb}^{-1})），对(B^{+}\to D^{+}D^{-}K^{+})和(B^{+}\to D^{-}D^{+}K^{+})衰变中的共振结构进行了研究。对这两个通道进行了同时振幅拟合，其中共振衰变到由C宇称联系的(D^{-}D^{+})和(D^{+}D^{-})态有贡献。该过程允许确定(D^{±}D^{∓})质谱中共振的C宇称。观察到四个粲偶素或类粲偶素态衰变为(D^{±}D^{∓})：(\eta_{c}(3945))、(h_{c}(4000))、(\chi_{c1}(4010))和(h_{c}(4300))，其量子数(J^{PC})分别等于(0^{-+})、(1^{+-})、(1^{++})和(1^{+-})。这些态中至少有三个以前未被观察到。此外，在(B^{+}\to D^{+}D^{-}K^{+})衰变中已观察到的(D^{-}K^{+})质谱中的(T_{c\bar{s}0}^{}(2870)^{0})和(T_{c\bar{s}1}^{}(2900)^{0})共振，在不同的产生通道中得到了证实。
