Search for tetraquark states <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>X</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mi>c</mml:mi><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:mrow></mml:msub></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>D</mml:mi…

A search for double-heavy tetraquark state candidates Xccs¯s¯ decaying to Ds+Ds+ and Ds*+Ds*+ is presented the first time using data samples of 102×106 ϒ(1S) 158×106 ϒ(2S) events, at s=10.52, 10.58, 10.867 GeV corresponding integrated luminosities 89.5, 711.0, 121.4 fb−1, respectively, accumulated with Belle detector KEKB asymmetric energy electron-positron collider. The invariant-mass spectra are studied possible resonances. No significant signals observed, 90% confidence level upper limits on product branching fractions [B(ϒ(1S,2S)→Xccs¯s¯+anything)×B(Xccs¯s¯→Ds+Ds+(Ds*+Ds*+))] in ϒ(1S,2S) inclusive decays values Born cross section fraction [σ(e+e−→Xccs¯s¯+anything)×B(Xccs¯s¯→Ds+Ds+(Ds*+Ds*+))] e+e− collisions under different assumptions masses widths obtained.Received 6 December 2021Accepted 21 January 2022DOI:https://doi.org/10.1103/PhysRevD.105.032002Published by American Physical Society terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.Published SocietyPhysics Subject Headings (PhySH)Physical SystemsCharmed mesonsExotic mesonsLepton collidersParticles & Fields