Observation of the Open-Charm Tetraquark Candidate 𝑇*𝑐𝑠0(2870)0 in the 𝐵−→𝐷−𝐷0𝐾0 𝑆 Decay

Physical Review Letters. 2025. Vol. 134. No. 10. Article 101901.

Aaij R., Abdelmotteleb A. S., Abellan Beteta C., Abudinén F., Ackernley T., Ratnikov F., Hushchyn M., Bocharnikov V., Ryzhikov A., Boldyrev A.

An amplitude analysis of 𝐵−→𝐷−⁢𝐷0⁢𝐾0𝑆 decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 9  fb−1, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A resonant structure of spin-parity 0+ is observed in the 𝐷0⁢𝐾0𝑆 invariant-mass spectrum with a significance of 5.3⁢𝜎. The mass and width of the state, modeled with a Breit-Wigner line shape, are determined to be 2883±11±8  MeV/𝑐2 and 87+22−47 ±17  MeV, respectively, where the first uncertainties are statistical and the second systematic. These properties and the quark content are consistent with those of the open-charm tetraquark candidate 𝑇*𝑐⁢𝑠⁢0⁢(2870)0 observed previously in the 𝐷+⁢𝐾− final state of the 𝐵−→𝐷−⁢𝐷+⁢𝐾− decay. This result confirms the existence of the 𝑇*𝑐⁢𝑠⁢0⁢(2870)0 state in a new decay mode. The 𝑇*𝑐⁢𝑠⁢1⁢(2900)0 state, reported in the 𝐵−→𝐷−⁢𝐷+⁢𝐾− decay, is also searched for in the 𝐷0⁢𝐾0𝑆 invariant-mass spectrum of the 𝐵− →𝐷−⁢𝐷0⁢𝐾0𝑆 decay, without finding evidence for it.

Keywords: физика частиц, elementary particle physics

Publication based on the results of: Development of theoretical foundations and methods of generative artificial intelligence and their application to heterogeneous domain area (2025)