Measurement of $\phi$-meson production in Cu$+$Au at $\sqrt{s_{_{NN}}}=200$ GeV and U$+$U at $\sqrt{s_{_{NN}}}=193$ GeV

The PHENIX collaboration
2022.

Abstract (data abstract)
The PHENIX experiment reports systematic measurements at the Relativistic Heavy Ion Collider of $\phi$-meson production in asymmetric Cu$+$Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV and in U$+$U collisions at $\sqrt{s_{_{NN}}}$ = 193 GeV. Measurements were performed via the $\phi\rightarrow K^{+}K^{-}$ decay channel at midrapidity $|\eta|<0.35$. Features of $\phi$-meson production measured in Cu$+$Cu, Cu$+$Au, Au$+$Au, and U$+$U collisions were found to not depend on the collision geometry, which was expected because the yields are averaged over the azimuthal angle and follow the expected scaling with nuclear overlap size. The elliptic flow of the $\phi$ meson in Cu$+$Au, Au$+$Au, and U$+$U collisions scales with second order participant eccentricity and the length scale of the nuclear overlap region (estimated with the number of participating nucleons). At moderate $p_T$, $\phi$-meson production measured in Cu$+$Au and U$+$U collisions is consistent with coalescence-model predictions, whereas at high $p_T$ the production is in agreement with expectations for in-medium energy loss of parent partons prior to their fragmentation. The elliptic flow for $\phi$ mesons measured in Cu$+$Au and U$+$U collisions is well described by a (2+1)D viscous-hydrodynamic model with specific-shear viscosity $\eta/s=1/4\pi$.

  • Figure3ab

    10.17182/hepdata.132483.v1/t1

    Invariant transverse momentum spectra measured for $\phi$ mesons in (a) Cu+Au and (b) U+U collisions at $\sqrt{s}$ = 200 GeV...

  • Figure3cd

    10.17182/hepdata.132483.v1/t2

    Invariant transverse momentum spectra measured for $\phi$ mesons in (c) Cu+Au and (d) U+U collisions at $\sqrt{s}$ = 200 GeV...

  • Figure4

    10.17182/hepdata.132483.v1/t3

    The $\phi$-meson nuclear modification factors $R_{AB}$ measured as a function of $p_T$ in different centrality intervals of (a) to (d)...

  • Figure5

    10.17182/hepdata.132483.v1/t4

    The $\phi$-meson integrated nuclear modification factors $R_{AB}$ measured as a function of $N_{part}$

  • Figure8

    10.17182/hepdata.132483.v1/t5

    The comparison of $\phi$ meson (a) $v_2$ and (b) $v_2/(\epsilon N_{part}^{1/3})$ measured as a function of $p_T$ in Cu+Au collisions...

  • Figure9a

    10.17182/hepdata.132483.v1/t6

    The comparison of elliptic flow (a) $v_2$ values measured for $\phi$ mesons as a function of $p_T$ in $0\%–20\%$ Cu+Au...

  • Figure9b

    10.17182/hepdata.132483.v1/t7

    The comparison of elliptic flow (b) $v_2$ values measured for $\phi$ mesons as a function of $KE_T$ in $0\%–20\%$ Cu+Au...

  • Figure9c

    10.17182/hepdata.132483.v1/t8

    The comparison of elliptic flow (c) $v_2/n_q$ values measured for $\phi$ mesons as a function of $KE_T/n_q$ in $0\%–20\%$ Cu+Au...

  • Figure10a

    10.17182/hepdata.132483.v1/t9

    The comparison of elliptic flow (a) $v_2$ values measured for $\phi$ mesons as a function of $p_T$ in $20\%–60\%$ Cu+Au...

  • Figure10b

    10.17182/hepdata.132483.v1/t10

    The comparison of elliptic flow (b) $v_2$ values measured for $\phi$ mesons as a function of $KE_T$ in $20\%–60\%$ Cu+Au...

  • Figure10c

    10.17182/hepdata.132483.v1/t11

    The comparison of elliptic flow (c) $v_2/n_q$ values measured for $\phi$ mesons as a function of $KE_T/n_q$ in $20\%–60\%$ Cu+Au...

  • Figure11a

    10.17182/hepdata.132483.v1/t12

    The comparison of elliptic flow (a) $v_2$ values measured for $\phi$ mesons as a function of $p_T$ in $0\%–50\%$ U+U...

  • Figure11b

    10.17182/hepdata.132483.v1/t13

    The comparison of elliptic flow (b) $v_2$ values measured for $\phi$ mesons as a function of $KE_T$ in $0\%–50\%$ U+U...

  • Figure11c

    10.17182/hepdata.132483.v1/t14

    The comparison of elliptic flow (c) $v_2/n_q$ values measured for $\phi$ mesons as a function of $KE_T/n_q$ in $0\%–50\%$ U+U...

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