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Evidence of rescattering effect in Pb-Pb collisions at the LHC through production of $\rm{K}^{*}(892)^{0}$ and $\phi(1020)$ mesons

The ALICE collaboration
Phys.Lett.B 802 (2020) 135225, 2020.

Abstract
Measurements of $\rm{K}^{*}(892)^{0}$ and $\phi(1020)$ resonance production in Pb-Pb and pp collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity ($|y|$ $<$ 0.5) via their hadronic decay channels and the transverse momentum ($p_{\rm{T}}$) distributions are obtained for various collision centrality classes up to $p_{\rm{T}}$ $=$ 20 GeV$/c$. The $p_{\rm{T}}$-integrated yield ratio $\rm{K}^{*}(892)^{0}$$/$K in Pb-Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the $\phi(1020)$$/$K ratio does not show any suppression. Furthermore, the measured $\rm{K}^{*}(892)^{0}$$/$K ratio in central Pb-Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the $\phi(1020)$$/$K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of $\rm{K}^{*}(892)^{0}$ decay products in the hadronic phase of the collisions. The $\rm{K}^{*}(892)^{0}$$/$K yield ratios in Pb-Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be $\sim$ 4-7 fm$/c$ for central collisions. The $p_{\rm{T}}$-differential ratios of $\rm{K}^{*}(892)^{0}$$/$K, $\phi(1020)$$/$K, $\rm{K}^{*}(892)^{0}$$/\pi$, $\phi(1020)$$/\pi$, $p/$$\rm{K}^{*}(892)^{0}$ and $p/$$\phi(1020)$ are also presented for Pb-Pb and pp collisions at $\sqrt{s_{\rm{NN}}}$ $=$ 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-$p_{\rm{T}}$ phenomenon.

  • Table 1

    Data from Figure 1 (left panel).

    10.17182/hepdata.93150.v1/t1

    $p_{\rm T}$-distributions of $\rm{K}^{*0}$ (average of particle and anti-particle) meson measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 2

    Data from Figure 1 (left panel).

    10.17182/hepdata.93150.v1/t2

    $p_{\rm T}$-distributions of $\rm{K}^{*0}$ (average of particle and anti-particle) meson measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 3

    Data from Figure 1 (right panel).

    10.17182/hepdata.93150.v1/t3

    $p_{\rm T}$-distributions of $\phi$ meson measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 4

    Data from Figure 1 (right panel).

    10.17182/hepdata.93150.v1/t4

    $p_{\rm T}$-distributions of $\phi$ meson measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 5

    Data from Figure 2.

    10.17182/hepdata.93150.v1/t5

    $p_{\rm T}$-integrated yield ratio of $\rm{K}^{*0}$ (average of particle and anti-particle) to K (average of particle and anti-particle) measured in...

  • Table 6

    Data from Figure 2.

    10.17182/hepdata.93150.v1/t6

    $p_{\rm T}$-integrated yield ratio of $\rm{K}^{*0}$ (average of particle and anti-particle) to K (average of particle and anti-particle) measured in...

  • Table 7

    Data from Figure 2.

    10.17182/hepdata.93150.v1/t7

    $p_{\rm T}$-integrated yield ratio of $\phi$ to K (average of particle and anti-particle) measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ =...

  • Table 8

    Data from Figure 2.

    10.17182/hepdata.93150.v1/t8

    $p_{\rm T}$-integrated yield ratio of $\phi$ to K (average of particle and anti-particle) measured in pp collisions at $\sqrt{s}$ =...

  • Table 9

    Data from Figure 4 (left panel).

    10.17182/hepdata.93150.v1/t9

    $p_{\rm T}$ differential ratio $(\rm{K}^{*0} + \bar{\rm{K}}^{*0}) / (\rm{K}^{+}+\rm{K}^{-})$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 10

    Data from Figure 4 (left panel).

    10.17182/hepdata.93150.v1/t10

    $p_{\rm T}$ differential ratio $(\rm{K}^{*0} + \bar{\rm{K}}^{*0}) / (\rm{K}^{+}+\rm{K}^{-})$ measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 11

    Data from Figure 4 (right panel).

    10.17182/hepdata.93150.v1/t11

    $p_{\rm T}$ differential ratio $(2\phi) / (\rm{K}^{+}+\rm{K}^{-})$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 12

    Data from Figure 4 (right panel).

    10.17182/hepdata.93150.v1/t12

    $p_{\rm T}$ differential ratio $(2\phi) / (\rm{K}^{+}+\rm{K}^{-})$ measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 13

    Data from Figure 5 (left panel).

    10.17182/hepdata.93150.v1/t13

    $p_{\rm T}$ differential ratio $(\rm{K}^{*0} + \bar{\rm{K}}^{*0}) / (\pi^{+}+\pi^{-})$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 14

    Data from Figure 5 (left panel).

    10.17182/hepdata.93150.v1/t14

    $p_{\rm T}$ differential ratio $(\rm{K}^{*0} + \bar{\rm{K}}^{*0}) / (\pi^{+}+\pi^{-})$ measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 15

    Data from Figure 5 (right panel).

    10.17182/hepdata.93150.v1/t15

    $p_{\rm T}$ differential ratio $(2\phi) / (\pi^{+}+\pi^{-})$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 16

    Data from Figure 5 (right panel).

    10.17182/hepdata.93150.v1/t16

    $p_{\rm T}$ differential ratio $(2\phi) / (\pi^{+}+\pi^{-})$ measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

  • Table 17

    Data from Figure 6 (left panel).

    10.17182/hepdata.93150.v1/t17

    $p_{\rm T}$ differential ratio $(\rm{p} + \bar{\rm p}) / (\rm{K}^{*0} + \bar{\rm{K}}^{*0})$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02...

  • Table 18

    Data from Figure 6 (left panel).

    10.17182/hepdata.93150.v1/t18

    $p_{\rm T}$ differential ratio $(\rm{p} + \bar{\rm p}) / (\rm{K}^{*0} + \bar{\rm{K}}^{*0})$ measured in pp collisions at $\sqrt{s}$ = 5.02...

  • Table 19

    Data from Figure 6 (right panel).

    10.17182/hepdata.93150.v1/t19

    $p_{\rm T}$ differential ratio $(\rm{p} + \bar{\rm p}) / (2\phi)$ measured in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

  • Table 20

    Data from Figure 6 (right panel).

    10.17182/hepdata.93150.v1/t20

    $p_{\rm T}$ differential ratio $(\rm{p} + \bar{\rm p}) / (2\phi)$ measured in pp collisions at $\sqrt{s}$ = 5.02 TeV.

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