Flavor-independent yield of high- pT hadrons from nuclear collisions

Data on high-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>p</a:mi><a:mi>T</a:mi></a:msub></a:math> hadron production in heavy ion collisions at Feynman <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msub><c:mi>x</c:mi><c:mi>F</c:mi></c:msub><c:mo>=</c:mo><c:mn>0</c:mn></c:math> indicate at universality of the observed nuclear suppression. Our analysis of the production mechanisms demonstrates important role of the color transparency effects which make the survival probability of a quark-antiquark dipole independent of the quark flavor, provided that the hadron wave function is formed outside the medium. The latter condition imposes restrictions on the range of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msub><e:mi>p</e:mi><e:mi>T</e:mi></e:msub></e:math>, which should be sufficiently high to make the nuclear suppression universal. We also found that the in-medium broadening rate <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mover accent="true"><g:mi>q</g:mi><g:mo stretchy="false">^</g:mo></g:mover></g:math> (frequently called transport coefficient) significantly depends on the quark flavor, diminishing for heavy quarks. Published by the American Physical Society 2024