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Production of pions, kaons, (anti-)protons and $\phi $ mesons in Xe–Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV

The ALICE collaboration
Eur.Phys.J.C 81 (2021) 584, 2021.

Abstract
The first measurement of the production of pions, kaons, (anti-)protons and $\phi$ mesons at midrapidity in Xe-Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV is presented. Transverse momentum ($p_{\rm T}$) spectra and $p_{\rm T}$-integrated yields are extracted in several centrality intervals bridging from p-Pb to mid-central Pb-Pb collisions in terms of final-state multiplicity. The study of Xe-Xe and Pb-Pb collisions allows systems at similar charged-particle multiplicities but with different initial geometrical eccentricities to be investigated. A detailed comparison of the spectral shapes in the two systems reveals an opposite behaviour for radial and elliptic flow. In particular, this study shows that the radial flow does not depend on the colliding system when compared at similar charged-particle multiplicity. In terms of hadron chemistry, the previously observed smooth evolution of particle ratios with multiplicity from small to large collision systems is also found to hold in Xe-Xe. In addition, our results confirm that two remarkable features of particle production at LHC energies are also valid in the collision of medium-sized nuclei: the lower proton-to-pion ratio with respect to the thermal model expectations and the increase of the $\phi$-to-pion ratio with increasing final-state multiplicity.

  • Table 1

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t1

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-5%.

  • Table 2

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t2

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-5%.

  • Table 3

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t3

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-5%.

  • Table 4

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t4

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 5-10%.

  • Table 5

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t5

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 5-10%.

  • Table 6

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t6

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 5-10%.

  • Table 7

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t7

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-20%.

  • Table 8

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t8

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-20%.

  • Table 9

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t9

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-20%.

  • Table 10

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t10

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 20-30%.

  • Table 11

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t11

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 20-30%.

  • Table 12

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t12

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 20-30%.

  • Table 13

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t13

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-40%.

  • Table 14

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t14

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-40%.

  • Table 15

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t15

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-40%.

  • Table 16

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t16

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 40-50%.

  • Table 17

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t17

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 40-50%.

  • Table 18

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t18

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 40-50%.

  • Table 19

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t19

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-60%.

  • Table 20

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t20

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-60%.

  • Table 21

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t21

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-60%.

  • Table 22

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t22

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 60-70%.

  • Table 23

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t23

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 60-70%.

  • Table 24

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t24

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 60-70%.

  • Table 25

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t25

    $p_{T}$-distributions of pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 26

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t26

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 27

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t27

    $p_{T}$-distributions of protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 28

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t28

    $p_{T}$-distributions of phi ($\phi$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-10%.

  • Table 29

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t29

    $p_{T}$-distributions of phi ($\phi$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-30%.

  • Table 30

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t30

    $p_{T}$-distributions of phi ($\phi$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-50%.

  • Table 31

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t31

    $p_{T}$-distributions of phi ($\phi$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-70%.

  • Table 32

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t32

    $p_{T}$-distributions of phi ($\phi$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 33

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t33

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-5%.

  • Table 34

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t34

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-5%.

  • Table 35

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t35

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 5-10%.

  • Table 36

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t36

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 5-10%.

  • Table 37

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t37

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-20%.

  • Table 38

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t38

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-20%.

  • Table 39

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t39

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 20-30%.

  • Table 40

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t40

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 20-30%.

  • Table 41

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t41

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-40%.

  • Table 42

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t42

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-40%.

  • Table 43

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t43

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 40-50%.

  • Table 44

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t44

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 40-50%.

  • Table 45

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t45

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-60%.

  • Table 46

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t46

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-60%.

  • Table 47

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t47

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 60-70%.

  • Table 48

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t48

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 60-70%.

  • Table 49

    Data from Figure 8, located on page 19.

    10.17182/hepdata.110161.v1/t49

    $p_{T}$-distributions of kaons ($K^{+}+K^{-}$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 50

    Data from Figure 9, located on page 19.

    10.17182/hepdata.110161.v1/t50

    $p_{T}$-distributions of protons ($p+pbar$)/pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 51

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t51

    $p_{T}$-distributions of phi ($\phi$)/protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 0-10%.

  • Table 52

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t52

    $p_{T}$-distributions of phi ($\phi$)/protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 10-30%.

  • Table 53

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t53

    $p_{T}$-distributions of phi ($\phi$)/protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 30-50%.

  • Table 54

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t54

    $p_{T}$-distributions of phi ($\phi$)/protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 50-70%.

  • Table 55

    Data from Figure 1 located on page 13.

    10.17182/hepdata.110161.v1/t55

    $p_{T}$-distributions of phi ($\phi$)/protons ($p+pbar$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV. Centrality class 70-90%.

  • Table 56

    Data from Figure 7, located on page 17.

    10.17182/hepdata.110161.v1/t56

    Integrated yield ratios of kaons ($K^{+}+K^{-}$) to pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV.

  • Table 57

    Data from Figure 7, located on page 17.

    10.17182/hepdata.110161.v1/t57

    Integrated yield ratios of protons ($p+pbar$) to pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV.

  • Table 58

    Data from Figure 7, located on page 17.

    10.17182/hepdata.110161.v1/t58

    Integrated yield ratios of phi ($\phi$) to pions ($\pi^{+}+\pi^{-}$) measured in Xe-Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV.

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