Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at $$ \sqrt{s} $$ = 5.02 and 13 TeV
抄録
<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The production of J/<jats:italic>ψ</jats:italic> is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5.02 and 13 TeV. The J/<jats:italic>ψ</jats:italic> mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 <jats:italic>< y <</jats:italic> 4.0), whereas the charged-particle multiplicity density (d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub><jats:italic>/</jats:italic>d<jats:italic>η</jats:italic>) is measured at midrapidity (<jats:italic>|η| <</jats:italic> 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>/⟨d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>⟩), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (⟨<jats:italic>p</jats:italic><jats:sub>T</jats:sub>⟩) of J/<jats:italic>ψ</jats:italic> in pp collisions exhibits an increasing trend as a function of d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>/⟨d<jats:italic>N</jats:italic><jats:sub>ch</jats:sub>/d<jats:italic>η</jats:italic>⟩ showing a saturation towards high charged-particle multiplicities.</jats:p>
収録刊行物
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- Journal of High Energy Physics
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Journal of High Energy Physics 2022 (6), 2022-06-06
Springer Science and Business Media LLC