Strange hadron collectivity in pPb and PbPb collisions

The CMS collaboration
JHEP 05 (2023) 007, 2023.

Abstract
The collective behavior of K$^0_\mathrm{S}$ and $\Lambda/\bar{\Lambda}$ strange hadrons is studied by measuring the elliptic azimuthal anisotropy ($v_2$) using the scalar-product and multiparticle correlation methods. Proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV and lead-lead (PbPb) collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV collected by the CMS experiment at the LHC are investigated. Nonflow effects in the pPb collisions are studied by using a subevent cumulant analysis and by excluding events where a jet with transverse momentum greater than 20\GeV is present. The strange hadron $v_2$ values extracted in \pPb collisions via the four- and six-particle correlation method are found to be nearly identical, suggesting the collective behavior. Comparisons of the pPb and PbPb results for both strange hadrons and charged particles illustrate how event-by-event flow fluctuations depend on the system size.

  • table1

    Data from Figure 2, upper

    10.17182/hepdata.115425.v1/t1

    The elliptic flow $v_2\{4\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table2

    Data from Figure 2, upper

    10.17182/hepdata.115425.v1/t2

    The elliptic flow $v_2\{6\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table3

    Data from Figure 2, upper

    10.17182/hepdata.115425.v1/t3

    The elliptic flow $v_2\{8\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table4

    Data from Figure 2, upper

    10.17182/hepdata.115425.v1/t4

    The elliptic flow $v_2\{SP\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table5

    Data from Figure 2, middle

    10.17182/hepdata.115425.v1/t5

    The elliptic flow $v_2\{4\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table6

    Data from Figure 2, middle

    10.17182/hepdata.115425.v1/t6

    The elliptic flow $v_2\{6\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table7

    Data from Figure 2, middle

    10.17182/hepdata.115425.v1/t7

    The elliptic flow $v_2\{8\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table8

    Data from Figure 2, middle

    10.17182/hepdata.115425.v1/t8

    The elliptic flow $v_2\{SP\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table9

    Data from Figure 2, lower

    10.17182/hepdata.115425.v1/t9

    The elliptic flow $v_2\{4\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table10

    Data from Figure 2, lower

    10.17182/hepdata.115425.v1/t10

    The elliptic flow $v_2\{6\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table11

    Data from Figure 2, lower

    10.17182/hepdata.115425.v1/t11

    The elliptic flow $v_2\{8\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table12

    Data from Figure 2, lower

    10.17182/hepdata.115425.v1/t12

    The elliptic flow $v_2\{SP\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table13

    Data from Figure 3, upper

    10.17182/hepdata.115425.v1/t13

    The elliptic flow $v_2\{4\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table14

    Data from Figure 3, upper

    10.17182/hepdata.115425.v1/t14

    The elliptic flow $v_2\{6\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table15

    Data from Figure 3, upper

    10.17182/hepdata.115425.v1/t15

    The elliptic flow $v_2\{8\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table16

    Data from Figure 3, upper

    10.17182/hepdata.115425.v1/t16

    The elliptic flow $v_2\{p-SP\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table17

    Data from Figure 3, upper

    10.17182/hepdata.115425.v1/t17

    The elliptic flow $v_2\{Pb-SP\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table18

    Data from Figure 3, middle

    10.17182/hepdata.115425.v1/t18

    The elliptic flow $v_2\{4\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table19

    Data from Figure 3, middle

    10.17182/hepdata.115425.v1/t19

    The elliptic flow $v_2\{6\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table20

    Data from Figure 3, middle

    10.17182/hepdata.115425.v1/t20

    The elliptic flow $v_2\{p-SP\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table21

    Data from Figure 3, middle

    10.17182/hepdata.115425.v1/t21

    The elliptic flow $v_2\{Pb-SP\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table22

    Data from Figure 3, lower

    10.17182/hepdata.115425.v1/t22

    The elliptic flow $v_2\{4\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table23

    Data from Figure 3, lower

    10.17182/hepdata.115425.v1/t23

    The elliptic flow $v_2\{6\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table24

    Data from Figure 3, lower

    10.17182/hepdata.115425.v1/t24

    The elliptic flow $v_2\{p-SP\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table25

    Data from Figure 3, lower

    10.17182/hepdata.115425.v1/t25

    The elliptic flow $v_2\{Pb-SP\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table26

    Data from Figure 4, upper

    10.17182/hepdata.115425.v1/t26

    The elliptic flow $v_2\{4,veto\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table27

    Data from Figure 4, upper

    10.17182/hepdata.115425.v1/t27

    The elliptic flow $v_2\{6,veto\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table28

    Data from Figure 4, lower

    10.17182/hepdata.115425.v1/t28

    The ratio $v_2\{4,veto\}/v_2\{4\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table29

    Data from Figure 4, lower

    10.17182/hepdata.115425.v1/t29

    The ratio $v_2\{6,veto\}/v_2\{6\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table30

    Data from Figure 5, upper

    10.17182/hepdata.115425.v1/t30

    The elliptic flow $v_2\{4,Sub\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table31

    Data from Figure 5, middle

    10.17182/hepdata.115425.v1/t31

    The elliptic flow $v_2\{4,Sub\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table32

    Data from Figure 5, lower

    10.17182/hepdata.115425.v1/t32

    The elliptic flow $v_2\{4,Sub\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table33

    Data from Figure 5, middle

    10.17182/hepdata.115425.v1/t33

    The elliptic flow $v_2\{4,Sub\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table34

    Data from Figure 5, lower

    10.17182/hepdata.115425.v1/t34

    The elliptic flow $v_2\{4,Sub\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table35

    Data from Figure 6

    10.17182/hepdata.115425.v1/t35

    The elliptic flow $v_2\{4,Sub\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table36

    Data from Figure 7, upper

    10.17182/hepdata.115425.v1/t36

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table37

    Data from Figure 7, upper

    10.17182/hepdata.115425.v1/t37

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table38

    Data from Figure 7, upper

    10.17182/hepdata.115425.v1/t38

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table39

    Data from Figure 7, lower

    10.17182/hepdata.115425.v1/t39

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for charged hadron as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table40

    Data from Figure 7, lower

    10.17182/hepdata.115425.v1/t40

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table41

    Data from Figure 7, lower

    10.17182/hepdata.115425.v1/t41

    The ratio $v_2\{4,Sub\}/v_2\{4\}$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table42

    Data from Figure 8, upper

    10.17182/hepdata.115425.v1/t42

    The flow fluctuation $\sigma/\langle v_{2} \rangle$ for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table43

    Data from Figure 8, middle

    10.17182/hepdata.115425.v1/t43

    The flow fluctuation $\sigma/\langle v_2 \rangle$ for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table44

    Data from Figure 8, lower

    10.17182/hepdata.115425.v1/t44

    The flow fluctuation $\sigma/\langle v_2 \rangle$ for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table45

    Data from Figure 8, middle

    10.17182/hepdata.115425.v1/t45

    The flow fluctuation $\sigma/\langle v_2 \rangle$ for $K_S^0$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table46

    Data from Figure 8, lower

    10.17182/hepdata.115425.v1/t46

    The flow fluctuation $\sigma/\langle v_2 \rangle$ for $\Lambda$ as a function of $p_T$ in pPb collision at 8.16 TeV.

  • table47

    Data from Figure 9

    10.17182/hepdata.115425.v1/t47

    The flow fluctuation $\sigma/\langle v_2 \rangle$ using $v_2\{4\}$ for charged hadron as a function of $p_T$ in pPb collision at...

  • table48

    Data from Figure 9

    10.17182/hepdata.115425.v1/t48

    The flow fluctuation $\sigma/\langle v_2 \rangle$ using $v_2\{6\}$ for charged hadron as a function of $p_T$ in pPb collision at...

  • table49

    Data from Figure 9

    10.17182/hepdata.115425.v1/t49

    The flow fluctuation $\sigma/\langle v_2 \rangle$ using $v_2\{4,veto\}$ for charged hadron as a function of $p_T$ in pPb collision at...

  • table50

    Data from Figure 10, upper

    10.17182/hepdata.115425.v1/t50

    The $v_2\{6\}/v_2\{4\}$ ratio for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table51

    Data from Figure 10, upper

    10.17182/hepdata.115425.v1/t51

    The $v_2\{6\}/v_2\{4\}$ ratio for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table52

    Data from Figure 10, upper

    10.17182/hepdata.115425.v1/t52

    The $v_2\{6\}/v_2\{4\}$ ratio for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table53

    Data from Figure 10, lower

    10.17182/hepdata.115425.v1/t53

    The $v_2\{8\}/v_2\{4\}$ ratio for charged hadron as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table54

    Data from Figure 10, lower

    10.17182/hepdata.115425.v1/t54

    The $v_2\{8\}/v_2\{4\}$ ratio for $K_S^0$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

  • table55

    Data from Figure 10, lower

    10.17182/hepdata.115425.v1/t55

    The $v_2\{8\}/v_2\{4\}$ ratio for $\Lambda$ as a function of $p_T$ in PbPb collision at 5.02 TeV.

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