Prediction of possible DK1 bound states

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 57; no. 4
• Main Authors: Dong, Xiang-Kun, Zou, Bing-Song
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2021; Springer Nature B.V
• Subjects: Hadrons; Heavy Ions; Nuclear Fusion; Nuclear Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Regular Article –Theoretical Physics; S waves; Vector mesons
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/s10050-021-00442-7

Stimulated by recent experimental observation of X 1 ( 2900 ) just below the D ¯ 1 K threshold, we extend our previous study of D ¯ 1 D S-wave bound state by vector meson exchange to D ¯ 1 K system as well as similar D ¯ K 1 , D 1 K and D K 1 systems to look for possible bound states. We find that the potential of D K 1 is attractive and strong enough to form bound states with mass around 3110 MeV for D K 1 ( 1270 ) and 3240 MeV for D K 1 ( 1400 ) . D 1 K is also attractive but weaker, hardly enough to form bound states. While D ¯ K 1 becomes further less attractive, the potential between D ¯ 1 K is the weakest, definitely too weak to form any bound state, which excludes the recently observed X 1 ( 2900 ) to be a D ¯ 1 K bound state. We also give the decay properties of the predicted D K 1 bound states.