Strong decay analysis of excited nonstrange charmed mesons: implications for spectroscopy

The strong decays of experimentally observed excited nonstrange charmed mesons are analyzed in the framework of heavy quark effective theory (HQET). The ratio of the strong decay rates identified the doublets ( D 1 ( 2420 ) , D 2 ∗ ( 2460 ) ) as ( 1 3 P 1 , 1 3 P 2 ) , ( D ( 2550 ) , D J ∗ ( 2600 ) ) as ( 2 1 S 0 , 2 3 S 1 ) and ( D ( 2740 ) , D J ∗ ( 2750 ) ) as ( 1 3 D 2 , 1 3 D 3 ) . The D J ( 3000 ) is interpreted as the mixing of 2 1 P 1 - 2 3 P 1 states. The resonances D J ∗ ( 3000 ) and D 2 ∗ ( 3000 ) are identified with 2 3 P 2 and 1 3 F 2 quantum states, respectively. Such states allows to construct the Regge trajectories in ( M 2 , J ) and ( M 2 , n r ) planes. We fix the slope and the intercept of each Regge line and estimate the masses of higher excited nonstrange charmed mesons which are lying on the Regge lines. Also, the ratios of the strong decay rates of this higher excited nonstrange charmed mesons are calculated. It can provide valuable information to future experimental search.