Study of Open-Charm Decays and Radiative Transitions of the X(3872)

Abstract

The processes X(3872) -> D*(0)(D) over bar (0) + c.c., gamma J/psi, gamma psi(2S), and gamma D+D- are searched for in a 9.0 fb(-1) data sample collected at center-of-mass energies between 4.178 and 4.278 GeV with the BESIII detector. We observe X(3872) -> D*(0)(D) over bar (0) + c.c. and find evidence for X(3872) -> gamma J/psi with statistical significances of 7.4 sigma and 3.5 sigma, respectively. No evident signals for X(3872) -> gamma psi/(2S) and gamma D+D- are found, and the upper limit on the relative branching ratio R-gamma psi {B[X(3872) -> gamma psi(2S)]}/{B[X(3872) -> gamma J/psi]} < 0.59 is set at 90% confidence level. Measurements of branching ratios relative to decay X(3872) -> pi(+)pi(-) J/psi are also reported for decays X(3872) -> D*(0)(D) over bar (0) c.c., gamma psi(2S), gamma J/psi, and gamma D+D-, as well as the non-D*(0)(D) over bar (0) three-body decays pi D-0(0)(D) over bar (0) and gamma D-0(D) over bar (0)