Precise Measurement of Born Cross Sections for e+e−→DD¯</mml:…

Using data samples collected with the BESIII detector at the BEPCII collider at center-of-mass energies ranging from 3.80 to 4.95 GeV, corresponding to an integrated luminosity of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>20</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mi>fb</a:mi><a:mrow><a:mo>−</a:mo><a:mn>1</a:mn></a:mrow></a:msup></a:math>, a measurement of Born cross sections for the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>e</c:mi><c:mo>+</c:mo></c:msup><c:msup><c:mi>e</c:mi><c:mo>−</c:mo></c:msup><c:mo stretchy="false">→</c:mo><c:msup><c:mi>D</c:mi><c:mn>0</c:mn></c:msup><c:msup><c:mover accent="true"><c:mi>D</c:mi><c:mo stretchy="false">¯</c:mo></c:mover><c:mn>0</c:mn></c:msup></c:math> and <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:msup><h:mi>D</h:mi><h:mo>+</h:mo></h:msup><h:msup><h:mi>D</h:mi><h:mo>−</h:mo></h:msup></h:math> processes is presented with unprecedented precision. Many clear peaks in the line shape of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:msup><j:mi>e</j:mi><j:mo>+</j:mo></j:msup><j:msup><j:mi>e</j:mi><j:mo>−</j:mo></j:msup><j:mo stretchy="false">→</j:mo><j:msup><j:mi>D</j:mi><j:mn>0</j:mn></j:msup><j:msup><j:mover accent="true"><j:mi>D</j:mi><j:mo stretchy="false">¯</j:mo></j:mover><j:mn>0</j:mn></j:msup></j:math> and <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"><o:msup><o:mi>D</o:mi><o:mo>+</o:mo></o:msup><o:msup><o:mi>D</o:mi><o:mo>−</o:mo></o:msup></o:math> around the mass range of <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"><q:mi>G</q:mi><q:mo stretchy="false">(</q:mo><q:mn>3900</q:mn><q:mo stretchy="false">)</q:mo></q:math>, <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"><u:mi>ψ</u:mi><u:mo stretchy="false">(</u:mo><u:mn>4040</u:mn><u:mo stretchy="false">)</u:mo></u:math>, <y:math xmlns:y="http://www.w3.org/1998/Math/MathML" display="inline"><y:mi>ψ</y:mi><y:mo stretchy="false">(</y:mo><y:mn>4160</y:mn><y:mo stretchy="false">)</y:mo></y:math>, <cb:math xmlns:cb="http://www.w3.org/1998/Math/MathML" display="inline"><cb:mi>Y</cb:mi><cb:mo stretchy="false">(</cb:mo><cb:mn>4260</cb:mn><cb:mo stretchy="false">)</cb:mo></cb:math>, and <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"><gb:mi>ψ</gb:mi><gb:mo stretchy="false">(</gb:mo><gb:mn>4415</gb:mn><gb:mo stretchy="false">)</gb:mo></gb:math>, etc., are foreseen. These results offer crucial experimental insights into the nature of hadron production in the open-charm region. Published by the American Physical Society 2024