Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions
Pseudorapidity
Multiplicity (mathematics)
DOI:
10.1103/physrevlett.132.172302
Publication Date:
2024-04-26T16:07:14Z
AUTHORS (1055)
ABSTRACT
This Letter presents the measurement of near-side associated per-trigger yields, denoted ridge from analysis angular correlations charged hadrons in proton-proton collisions at <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msqrt><a:mrow><a:mi>s</a:mi></a:mrow></a:msqrt><a:mo>=</a:mo><a:mn>13</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>TeV</a:mi></a:mrow></a:math>. Long-range yields are extracted for pairs particles with a pseudorapidity difference <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mn>1.4</c:mn><c:mo><</c:mo><c:mo stretchy="false">|</c:mo><c:mi mathvariant="normal">Δ</c:mi><c:mi>η</c:mi><c:mo stretchy="false">|</c:mo><c:mo><</c:mo><c:mn>1.8</c:mn></c:mrow></c:math> and transverse momentum <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:mrow><h:mn>1</h:mn><h:mo><</h:mo><h:msub><h:mrow><h:mi>p</h:mi></h:mrow><h:mrow><h:mi mathvariant="normal">T</h:mi></h:mrow></h:msub><h:mo><</h:mo><h:mn>2</h:mn><h:mtext> </h:mtext><h:mtext> </h:mtext><h:mrow><h:mi>GeV</h:mi><h:mo>/</h:mo><h:mi>c</h:mi></h:mrow></h:mrow></h:math>, as function charged-particle multiplicity measured midrapidity. extends measurements yield to low region, where hadronic it is typically conjectured that strongly interacting medium unlikely be formed. The precision new results allows first direct quantitative comparison obtained <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:msup><k:mi mathvariant="normal">e</k:mi><k:mo>+</k:mo></k:msup><k:msup><k:mi mathvariant="normal">e</k:mi><k:mo>−</k:mo></k:msup></k:math> <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"><o:msqrt><o:mi>s</o:mi></o:msqrt><o:mo>=</o:mo><o:mn>91</o:mn><o:mtext> </o:mtext><o:mtext> </o:mtext><o:mi>GeV</o:mi></o:math> <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"><q:mrow><q:msqrt><q:mrow><q:mi>s</q:mi></q:mrow></q:msqrt><q:mo>=</q:mo><q:mn>183</q:mn><q:mi>–</q:mi><q:mn>209</q:mn><q:mtext> </q:mtext><q:mtext> </q:mtext><q:mi>GeV</q:mi></q:mrow></q:math>, initial-state effects such preequilibrium dynamics collision geometry not expected play role. In range <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"><s:mn>8</s:mn><s:mo>≲</s:mo><s:mo stretchy="false">⟨</s:mo><s:msub><s:mi>N</s:mi><s:mi>ch</s:mi></s:msub><s:mo stretchy="false">⟩</s:mo><s:mo>≲</s:mo><s:mn>24</s:mn></s:math> <w:math xmlns:w="http://www.w3.org/1998/Math/MathML" display="inline"><w:msup><w:mi mathvariant="normal">e</w:mi><w:mo>+</w:mo></w:msup><w:msup><w:mi mathvariant="normal">e</w:mi><w:mo>−</w:mo></w:msup></w:math> have good precision, <ab:math xmlns:ab="http://www.w3.org/1998/Math/MathML" display="inline"><ab:mi>p</ab:mi><ab:mi>p</ab:mi></ab:math> substantially larger than limits set <cb:math xmlns:cb="http://www.w3.org/1998/Math/MathML" display="inline"><cb:msup><cb:mi mathvariant="normal">e</cb:mi><cb:mo>+</cb:mo></cb:msup><cb:msup><cb:mi mathvariant="normal">e</cb:mi><cb:mo>−</cb:mo></cb:msup></cb:math> annihilations. Consequently, findings presented this suggest processes involved <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"><gb:msup><gb:mi mathvariant="normal">e</gb:mi><gb:mo>+</gb:mo></gb:msup><gb:msup><gb:mi mathvariant="normal">e</gb:mi><gb:mo>−</gb:mo></gb:msup></gb:math> annihilations do contribute significantly emergence long-range <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"><kb:mi>p</kb:mi><kb:mi>p</kb:mi></kb:math> collisions. © 2024 CERN, ALICE Collaboration CERN
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