Study of 1D stranged-charm meson family using HQET

TL;DR

This paper uses heavy quark effective theory to analyze the D* s1(2860) and D* s3(2860) mesons, proposing a mixing model for D* s1(2860) and studying decay behaviors to better understand their structure.

Contribution

It introduces a mixing model for D* s1(2860) using HQET, providing specific ranges for mixing angles and coupling constants, and offers predictions for experimental verification.

Findings

D* s1(2860) is best described as a mixture of 13D1 and 23S1 states.

The mixing angle for D* s1(2860) is between -1.6 and -1.2 radians.

Coupling constants gxh and gyh are estimated to be between 0.17-0.20 and 0.40, respectively.

Abstract

Recently LHCb predicted spin 1 and spin 3 states D* s1(2860) and D* s3(2860) which are studied through their strong decays, and are assigned to fit the 13D1and 13D3 states in the charm spectroscopy. In this paper,using the heavy quark effective theory, we state that assigning D*s1(2860) as the mixing of 13D1 - 23S1 states, is rather a better justification to its observed experimental values than a pure state. We study its decay modes variation with hadronic coupling constant gxh and the mixing angle . We appoint spin 3 state D* s3(2860) as the missing 1D 3- JP state, and also study its decay channel behavior with coupling constant gyh. To appreciate the above results, we check the variation of decay modes for their spin partners states i.e. 1D2 and 1D'2 with their masses and strong coupling constant i.e. gxh and gyh. Our calculation using HQET approach give mixing angle between the 13D1 - 23S1 state for D* s1(2860) to lie in the range (-1.6 radians < theta < -1.2 radians). Our calculation for coupling constant values gives gxh to lie between value 0:17 < gxh < 0:20 and gyh to be 0.40. We expect from experiments to observe this mixing angle to verify our results.