Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> Meson Photoproduction in Ultraperipheral Heavy Ion Collisions

This Letter reports the first measurement of photonuclear <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msup> <a:mi>D</a:mi> <a:mn>0</a:mn> </a:msup> </a:math> meson production in ultraperipheral heavy ion collisions. The study is performed using lead-lead collision data, with an integrated luminosity of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>1.34</c:mn> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:msup> <c:mi>nb</c:mi> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:math> , collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 5.36 TeV. Photonuclear events, where one of the colliding nuclei breaks up and the other remains intact, are selected based on breakup neutron emissions and by requiring no particle activity in a large rapidity interval in the direction of the photon-emitting nucleus. The <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:msup> <e:mi>D</e:mi> <e:mn>0</e:mn> </e:msup> </e:math> mesons are reconstructed via the <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msup> <g:mi>D</g:mi> <g:mn>0</g:mn> </g:msup> <g:mo stretchy="false">→</g:mo> <g:msup> <g:mi>K</g:mi> <g:mo>−</g:mo> </g:msup> <g:msup> <g:mi>π</g:mi> <g:mo>+</g:mo> </g:msup> </g:math> decay channel, with the cross section measured as a function of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:msup> <j:mi>D</j:mi> <j:mn>0</j:mn> </j:msup> </j:math> meson transverse momentum and rapidity. The results are compared with next-to-leading-order perturbative QCD calculations that employ recent parametrizations of the lead nuclear parton distribution functions, as well as with predictions based on the color glass condensate framework. This measurement is the first photonuclear collision study characterizing parton distribution functions of lead nuclei for parton fractional momenta <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"> <l:mi>x</l:mi> </l:math> (relative to the nucleon) ranging approximately from a few <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"> <n:msup> <n:mn>10</n:mn> <n:mrow> <n:mo>−</n:mo> <n:mn>4</n:mn> </n:mrow> </n:msup> </n:math> to <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:msup> <p:mn>10</p:mn> <p:mrow> <p:mo>−</p:mo> <p:mn>2</p:mn> </p:mrow> </p:msup> </p:math> for different hard energy scale <r:math xmlns:r="http://www.w3.org/1998/Math/MathML" display="inline"> <r:msup> <r:mi>Q</r:mi> <r:mn>2</r:mn> </r:msup> </r:math> selections.

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Journal
Physical Review Letters
Published
2026-01-07
DOI
https://doi.org/10.1103/lckg-sdh9
Primary Topic
High-Energy Particle Collisions Research
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article
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article

Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> Meson Photoproduction in Ultraperipheral Heavy Ion Collisions

Anonymous
Physical Review Letters
High-Energy Particle Collisions Research
article

Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> Meson Photoproduction in Ultraperipheral Heavy Ion Collisions

Anonymous
article en

Abstract

This Letter reports the first measurement of photonuclear <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msup> <a:mi>D</a:mi> <a:mn>0</a:mn> </a:msup> </a:math> meson production in ultraperipheral heavy ion collisions. The study is performed using lead-lead collision data, with an integrated luminosity of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>1.34</c:mn> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:msup> <c:mi>nb</c:mi> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:math> , collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 5.36 TeV. Photonuclear events, where one of the colliding nuclei breaks up and the other remains intact, are selected based on breakup neutron emissions and by requiring no particle activity in a large rapidity interval in the direction of the photon-emitting nucleus. The <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:msup> <e:mi>D</e:mi> <e:mn>0</e:mn> </e:msup> </e:math> mesons are reconstructed via the <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msup> <g:mi>D</g:mi> <g:mn>0</g:mn> </g:msup> <g:mo stretchy="false">→</g:mo> <g:msup> <g:mi>K</g:mi> <g:mo>−</g:mo> </g:msup> <g:msup> <g:mi>π</g:mi> <g:mo>+</g:mo> </g:msup> </g:math> decay channel, with the cross section measured as a function of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:msup> <j:mi>D</j:mi> <j:mn>0</j:mn> </j:msup> </j:math> meson transverse momentum and rapidity. The results are compared with next-to-leading-order perturbative QCD calculations that employ recent parametrizations of the lead nuclear parton distribution functions, as well as with predictions based on the color glass condensate framework. This measurement is the first photonuclear collision study characterizing parton distribution functions of lead nuclei for parton fractional momenta <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"> <l:mi>x</l:mi> </l:math> (relative to the nucleon) ranging approximately from a few <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"> <n:msup> <n:mn>10</n:mn> <n:mrow> <n:mo>−</n:mo> <n:mn>4</n:mn> </n:mrow> </n:msup> </n:math> to <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:msup> <p:mn>10</p:mn> <p:mrow> <p:mo>−</p:mo> <p:mn>2</p:mn> </p:mrow> </p:msup> </p:math> for different hard energy scale <r:math xmlns:r="http://www.w3.org/1998/Math/MathML" display="inline"> <r:msup> <r:mi>Q</r:mi> <r:mn>2</r:mn> </r:msup> </r:math> selections.

Physical Review LettersVol. 136(12)
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