Decipher the short-distance component of X(3872) in Bc decays

A foremost task in understanding the nature of the X(3872)X(3872) involves the discrimination of the two-quark and multiquark configurations. In this work, we propose a method to probe the short-distance component of the X(3872)X(3872) by measuring the ratio between the BcBc semileptonic and nonleptonic decays into the X(3872)X(3872). We demonstrate that if the X(3872)X(3872) production mechanism is through the c¯c component, the ratios would be universal and could be reliably predicted in theory. Measurements of these ratios at LHC and the next-generation electron–positron colliders are capable of validating/invalidating this production mechanism and providing deeper insights into the nature of the X(3872)X(3872).