Mass spectra of strange double charm pentaquarks with strangeness S=-1

The observation of the T₂ₒ (2900) indicates the potential existence of strange double charm pentaquarks based on the heavy antidiquark symmetry. We systematically study the mass spectra of strange double charm pentaquarks with strangeness S=-1 in both molecular and compact structures for quantum numbers J^P=1/2^-, 3/2^-, 5/2^-. By constructing the interpolating currents, the mass spectra can be extracted from the two-point correlation functions in the framework of QCD sum rule method. In the molecular picture, we find that the c^+D^ +, c^'+D^ +, ₂^ +D^ +, ₂₂^ ++K^ 0 and ₂₂^ ++⁰ may form molecular strange double charm pentaquarks. In both pictures, the masses of the JP=1/2^-, 3/2^- pentaquarks locate within the 4. 2-4. 6~GeV and 4. 2-4. 5~GeV regions, respectively. As all of them are above the thresholds of their strong decay channels, they behave as a broad state, making them challenging to be detected in experiment. On the contrary, the mass of the JP=5/2^- strange double charm pentaquark is located at 4. 3~GeV and below its strong decay channel. This makes it as a narrow state and easy to be identified in experiment. The best observed channel is its semi-leptonic decay to double charm baryon. As the result, we strongly suggest experiments to search for JP=5/2^- strange double charm pentaquarks as a first try.