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Free keywords:
Hadronic decays, Multiquark bound states, Quark model, Exotic mesons, Quarkonia, Mass, Spin
MPINP:
LHCb - Abteilung Hinton
Abstract:
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 √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∓: nc(3945), hc(4000), Xc1(4010), and hc(4300), with quantum numbers JPC 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 TCS0*(2870)0 and TCS1*(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.