Status of charmed meson spectroscopy
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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Published online: 13 March 2019
The discovery of the ground state positive-parity charm-strange and charm-nonstrange mesons (2317), Ds1(2460), (2400) and D1(2430) in 2003 and 2004 brought up several mysteries related to their masses. Here I briefly review recent progresses from lattice calculations and analysis of the precise LHCb measurements of the B−→ D+π−π− in the framework of unitarized chiral perturbation theory. It turns out that all the mysteries can be understood in a picture consistent with both lattice results and the LHCb measurements. In this picture, the main components of (2317) and Ds1(2460) are DK and D∗K hadronic molecules, respectively. Furthermore, the resonance parameters of the ground state 0+ and 1+ charm-nonstrange mesons take values very diﬀerent from the known ones of the (2400) and D1(2430), which were obtained by using an improper resonance parameterization. It is pointed out that there should be two and two D1 broad states in region relevant to the (2400) and D1(2430). Suggestions towards identifying the higher nonstrange resonances are given.
© The Authors, published by EDP Sciences, 2019
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