Observation of strangeness enhancement with charmed mesons in high-multiplicity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>Pb</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>8.16</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>


Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Abellan Beteta, C, Abudinén, F ORCID: 0000-0002-6737-3528, Ackernley, T ORCID: 0000-0002-5951-3498, Adeva, B ORCID: 0000-0001-9756-3712, Adinolfi, M ORCID: 0000-0002-1326-1264, Adlarson, P ORCID: 0000-0001-6280-3851, Afsharnia, H, Agapopoulou, C ORCID: 0000-0002-2368-0147 et al (show 1099 more authors) (2024) Observation of strangeness enhancement with charmed mesons in high-multiplicity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>Pb</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>8.16</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>. Physical Review D, 110 (3). l031105-. ISSN 2470-0010, 2470-0029

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Abstract

<jats:p>The production of prompt <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi>D</a:mi><a:mi>s</a:mi><a:mo>+</a:mo></a:msubsup></a:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>D</c:mi><c:mo>+</c:mo></c:msup></c:math> mesons is measured by the LHCb experiment in proton-lead (<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:mi>p</e:mi><e:mi>Pb</e:mi></e:mrow></e:math>) collisions in both the forward (<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mn>1.5</g:mn><g:mo>&lt;</g:mo><g:msup><g:mi>y</g:mi><g:mo>*</g:mo></g:msup><g:mo>&lt;</g:mo><g:mn>4.0</g:mn></g:math>) and backward (<i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"><i:mo>−</i:mo><i:mn>5.0</i:mn><i:mo>&lt;</i:mo><i:msup><i:mi>y</i:mi><i:mo>*</i:mo></i:msup><i:mo>&lt;</i:mo><i:mo>−</i:mo><i:mn>2.5</i:mn></i:math>) rapidity regions at a nucleon-nucleon center-of-mass energy of <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:mrow><k:mrow><k:msqrt><k:mrow><k:msub><k:mrow><k:mi>s</k:mi></k:mrow><k:mrow><k:mi>NN</k:mi></k:mrow></k:msub></k:mrow></k:msqrt></k:mrow><k:mo>=</k:mo><k:mn>8.16</k:mn><k:mtext> </k:mtext><k:mtext> </k:mtext><k:mi>TeV</k:mi></k:mrow></k:math>. The nuclear modification factors of both <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"><m:msubsup><m:mi>D</m:mi><m:mi>s</m:mi><m:mo>+</m:mo></m:msubsup></m: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:math> mesons are determined as a function of transverse momentum, <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"><q:msub><q:mi>p</q:mi><q:mi mathvariant="normal">T</q:mi></q:msub></q:math>, and rapidity. In addition, the <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"><t:msubsup><t:mi>D</t:mi><t:mi>s</t:mi><t:mo>+</t:mo></t:msubsup></t:math> to <v:math xmlns:v="http://www.w3.org/1998/Math/MathML" display="inline"><v:msup><v:mi>D</v:mi><v:mo>+</v:mo></v:msup></v:math> cross section ratio is measured as a function of the primary charged particle multiplicity in the event. An enhanced <x:math xmlns:x="http://www.w3.org/1998/Math/MathML" display="inline"><x:msubsup><x:mi>D</x:mi><x:mi>s</x:mi><x:mo>+</x:mo></x:msubsup></x:math> to <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"><z:msup><z:mi>D</z:mi><z:mo>+</z:mo></z:msup></z:math> production in high-multiplicity events is observed for the whole measured <bb:math xmlns:bb="http://www.w3.org/1998/Math/MathML" display="inline"><bb:msub><bb:mi>p</bb:mi><bb:mi mathvariant="normal">T</bb:mi></bb:msub></bb:math> range, in particular at low <eb:math xmlns:eb="http://www.w3.org/1998/Math/MathML" display="inline"><eb:msub><eb:mi>p</eb:mi><eb:mi mathvariant="normal">T</eb:mi></eb:msub></eb:math> and backward rapidity, where the significance exceeds six standard deviations. This constitutes the first observation of strangeness enhancement in charm quark hadronization in high-multiplicity <hb:math xmlns:hb="http://www.w3.org/1998/Math/MathML" display="inline"><hb:mrow><hb:mi>p</hb:mi><hb:mi>Pb</hb:mi></hb:mrow></hb:math> collisions. The results are also qualitatively consistent with the presence of quark coalescence as an additional charm quark hadronization mechanism in high-multiplicity proton-lead collisions.</jats:p> <jats:sec> <jats:title/> <jats:supplementary-material> <jats:permissions> <jats:copyright-statement>© 2024 CERN, for the LHCb Collaboration</jats:copyright-statement> <jats:copyright-year>2024</jats:copyright-year> <jats:copyright-holder>CERN</jats:copyright-holder> </jats:permissions> </jats:supplementary-material> </jats:sec>

Item Type: Article
Uncontrolled Keywords: 5107 Particle and High Energy Physics, 5101 Astronomical Sciences, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2024 08:07
Last Modified: 09 Dec 2024 11:17
DOI: 10.1103/physrevd.110.l031105
Open Access URL: https://journals.aps.org/prd/pdf/10.1103/PhysRevD....
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3184184
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