Search for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:m
We search for the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msup> <a:mi>e</a:mi> <a:mo>+</a:mo> </a:msup> <a:msup> <a:mi>e</a:mi> <a:mo>−</a:mo> </a:msup> <a:mo stretchy="false">→</a:mo> <a:mi>γ</a:mi> <a:msub> <a:mi>χ</a:mi> <a:mrow> <a:mi>b</a:mi> <a:mi>J</a:mi> </a:mrow> </a:msub> </a:math> ( <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"> <d:mi>J</d:mi> <d:mo>=</d:mo> <d:mn>0</d:mn> </d:math> , 1, 2) processes at center-of-mass energies <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"> <f:msqrt> <f:mi>s</f:mi> </f:msqrt> <f:mo>=</f:mo> <f:mn>10.653</f:mn> </f:math> , 10.701, 10.746, and 10.804 GeV. These data were collected with the Belle II detector at the SuperKEKB collider and correspond to 3.5, 1.6, 9.8, and <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"> <h:mn>4.7</h:mn> <h:mtext> </h:mtext> <h:mtext> </h:mtext> <h:msup> <h:mi>fb</h:mi> <h:mrow> <h:mo>−</h:mo> <h:mn>1</h:mn> </h:mrow> </h:msup> </h:math> of integrated luminosity, respectively. We set upper limits at the 90% confidence level on the Born cross sections for <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:mi>γ</j:mi> <j:msub> <j:mi>χ</j:mi> <j:mrow> <j:mi>b</j:mi> <j:mi>J</j:mi> </j:mrow> </j:msub> </j:math> at each center-of-mass energy <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:msqrt> <m:mi>s</m:mi> </m:msqrt> </m:math> near 10.746 GeV. The upper limits at 90% confidence level on the Born cross sections for <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"> <o:msup> <o:mi>e</o:mi> <o:mo>+</o:mo> </o:msup> <o:msup> <o:mi>e</o:mi> <o:mo>−</o:mo> </o:msup> <o:mo stretchy="false">→</o:mo> <o:mi>γ</o:mi> <o:msub> <o:mi>χ</o:mi> <o:mrow> <o:mi>b</o:mi> <o:mn>1</o:mn> </o:mrow> </o:msub> </o:math> are significantly smaller than the corresponding measured values for <r:math xmlns:r="http://www.w3.org/1998/Math/MathML" display="inline"> <r:msup> <r:mi>e</r:mi> <r:mo>+</r:mo> </r:msup> <r:msup> <r:mi>e</r:mi> <r:mo>−</r:mo> </r:msup> <r:mo stretchy="false">→</r:mo> <r:mi>ω</r:mi> <r:msub> <r:mi>χ</r:mi> <r:mrow> <r:mi>b</r:mi> <r:mn>1</r:mn> </r:mrow> </r:msub> </r:math> and <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"> <u:msup> <u:mi>e</u:mi> <u:mo>+</u:mo> </u:msup> <u:msup> <u:mi>e</u:mi> <u:mo>−</u:mo> </u:msup> <u:mo stretchy="false">→</u:mo> <u:msup> <u:mi>π</u:mi> <u:mo>+</u:mo> </u:msup> <u:msup> <u:mi>π</u:mi> <u:mo>−</u:mo> </u:msup> <u:mi mathvariant="normal">ϒ</u:mi> <u:mo stretchy="false">(</u:mo> <u:mn>2</u:mn> <u:mi>S</u:mi> <u:mo stretchy="false">)</u:mo> </u:math> at <ab:math xmlns:ab="http://www.w3.org/1998/Math/MathML" display="inline"> <ab:msqrt> <ab:mi>s</ab:mi> </ab:msqrt> <ab:mo>=</ab:mo> <ab:mn>10.746</ab:mn> <ab:mtext> </ab:mtext> <ab:mtext> </ab:mtext> <ab:mi>GeV</ab:mi> </ab:math> .
Authors
- Anonymous
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2026-02-13
- DOI
- https://doi.org/10.1103/2rv3-s3w7
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00