@article{article, title  = {{Observation of the Narrow State<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo>(</mml:mo><mml:mn>3872</mml:mn><mml:mo>)</mml:mo><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>p</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">T</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>}},

 publisher = {{American Physical Society (APS)}},

 url = {{https://doi.org/10.1103/physrevlett.93.072001 }},

 year = {{2004}},

 month = {{8}},

 author = {{Acosta D and Affolder T and Ahn MH and Akimoto T and Albrow MG and Ambrose D and Amerio S and Amidei D and Anastassov A and Anikeev K and Annovi A et al}},

 doi = {{10.1103/physrevlett.93.072001}},

 volume = {{93}},

 journal = {{Physical Review Letters}},

 issue = {{7}},

 note = {{Accessed on 2025/12/11}}}