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Multiplicity dependence of light-flavor hadron production in pp collisions at $\sqrt{s}$ = 7 TeV

The ALICE collaboration
Phys.Rev., 2018

Abstract (data abstract)
Comprehensive results on the production of unidentified charged particles, $\pi^{\pm}$, K$^{\pm}$, K$^{0}_{\text{s}}$, K*(892)$^{0}$, p, $\bar{\text{p}}$, $\phi$(1020), $\Lambda$, $\bar{\Lambda}$, $\Xi^{-}$, $\bar{\Xi}^{+}$, $\Omega^{-}$ and $\bar{\Omega}^{+}$ hadrons in proton-proton (pp) collisions at $\sqrt{s}$ = 7 TeV at midrapidity ($|y| < 0.5$) as a function of charged-particle multiplicity density are presented. In order to avoid auto-correlation biases, the actual transverse momentum ($p_{\text{T}}$) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particle to pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb--Pb collisions at LHC energies. The obtained \pt\ distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions.

  • Table 1

    Table from Figure 4

    10.17182/hepdata.84282.v1/t1

    Transverse momentum spectra of charged particles in V0M I multiplicity class

  • Table 2

    Table from Figure 4

    10.17182/hepdata.84282.v1/t2

    Transverse momentum spectra of charged particles in V0M II multiplicity class

  • Table 3

    Table from Figure 4

    10.17182/hepdata.84282.v1/t3

    Transverse momentum spectra of charged particles in V0M III multiplicity class

  • Table 4

    Table from Figure 4

    10.17182/hepdata.84282.v1/t4

    Transverse momentum spectra of charged particles in V0M IV multiplicity class

  • Table 5

    Table from Figure 4

    10.17182/hepdata.84282.v1/t5

    Transverse momentum spectra of charged particles in V0M V multiplicity class

  • Table 6

    Table from Figure 4

    10.17182/hepdata.84282.v1/t6

    Transverse momentum spectra of charged particles in V0M VI multiplicity class

  • Table 7

    Table from Figure 4

    10.17182/hepdata.84282.v1/t7

    Transverse momentum spectra of charged particles in V0M VII multiplicity class

  • Table 8

    Table from Figure 4

    10.17182/hepdata.84282.v1/t8

    Transverse momentum spectra of charged particles in V0M VIII multiplicity class

  • Table 9

    Table from Figure 4

    10.17182/hepdata.84282.v1/t9

    Transverse momentum spectra of charged particles in V0M IX multiplicity class

  • Table 10

    Table from Figure 4

    10.17182/hepdata.84282.v1/t10

    Transverse momentum spectra of charged particles in V0M X multiplicity class

  • Table 11

    Table from Figure 5

    10.17182/hepdata.84282.v1/t11

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class I

  • Table 12

    Table from Figure 5

    10.17182/hepdata.84282.v1/t12

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class II

  • Table 13

    Table from Figure 5

    10.17182/hepdata.84282.v1/t13

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class III

  • Table 14

    Table from Figure 5

    10.17182/hepdata.84282.v1/t14

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class IV

  • Table 15

    Table from Figure 5

    10.17182/hepdata.84282.v1/t15

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class V

  • Table 16

    Table from Figure 5

    10.17182/hepdata.84282.v1/t16

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class VI

  • Table 17

    Table from Figure 5

    10.17182/hepdata.84282.v1/t17

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class VII

  • Table 18

    Table from Figure 5

    10.17182/hepdata.84282.v1/t18

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class VIII

  • Table 19

    Table from Figure 5

    10.17182/hepdata.84282.v1/t19

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class IX

  • Table 20

    Table from Figure 5

    10.17182/hepdata.84282.v1/t20

    Transverse momentum spectra of $\pi^{+} + \pi^{-}$ in V0M multiplicity class X

  • Table 21

    Table from Figure 5

    10.17182/hepdata.84282.v1/t21

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class I

  • Table 22

    Table from Figure 5

    10.17182/hepdata.84282.v1/t22

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class II

  • Table 23

    Table from Figure 5

    10.17182/hepdata.84282.v1/t23

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class III

  • Table 24

    Table from Figure 5

    10.17182/hepdata.84282.v1/t24

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class IV

  • Table 25

    Table from Figure 5

    10.17182/hepdata.84282.v1/t25

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class V

  • Table 26

    Table from Figure 5

    10.17182/hepdata.84282.v1/t26

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class VI

  • Table 27

    Table from Figure 5

    10.17182/hepdata.84282.v1/t27

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class VII

  • Table 28

    Table from Figure 5

    10.17182/hepdata.84282.v1/t28

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class VIII

  • Table 29

    Table from Figure 5

    10.17182/hepdata.84282.v1/t29

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class IX

  • Table 30

    Table from Figure 5

    10.17182/hepdata.84282.v1/t30

    Transverse momentum spectra of $K^{+} + K^{-}$ in V0M multiplicity class X

  • Table 31

    Table from Figure 5

    10.17182/hepdata.84282.v1/t31

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class I

  • Table 32

    Table from Figure 5

    10.17182/hepdata.84282.v1/t32

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class II

  • Table 33

    Table from Figure 5

    10.17182/hepdata.84282.v1/t33

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class III

  • Table 34

    Table from Figure 5

    10.17182/hepdata.84282.v1/t34

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class IV

  • Table 35

    Table from Figure 5

    10.17182/hepdata.84282.v1/t35

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class V

  • Table 36

    Table from Figure 5

    10.17182/hepdata.84282.v1/t36

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class VI

  • Table 37

    Table from Figure 5

    10.17182/hepdata.84282.v1/t37

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class VII

  • Table 38

    Table from Figure 5

    10.17182/hepdata.84282.v1/t38

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class VIII

  • Table 39

    Table from Figure 5

    10.17182/hepdata.84282.v1/t39

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class IX

  • Table 40

    Table from Figure 5

    10.17182/hepdata.84282.v1/t40

    Transverse momentum spectra of $p + \bar{p}$ in V0M multiplicity class X

  • Table 41

    Table from Figure 5

    10.17182/hepdata.84282.v1/t41

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class I

  • Table 42

    Table from Figure 5

    10.17182/hepdata.84282.v1/t42

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class II

  • Table 43

    Table from Figure 5

    10.17182/hepdata.84282.v1/t43

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class III

  • Table 44

    Table from Figure 5

    10.17182/hepdata.84282.v1/t44

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class IV + V

  • Table 45

    Table from Figure 5

    10.17182/hepdata.84282.v1/t45

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class VI

  • Table 46

    Table from Figure 5

    10.17182/hepdata.84282.v1/t46

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class VII

  • Table 47

    Table from Figure 5

    10.17182/hepdata.84282.v1/t47

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class VIII

  • Table 48

    Table from Figure 5

    10.17182/hepdata.84282.v1/t48

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class IX

  • Table 49

    Table from Figure 5

    10.17182/hepdata.84282.v1/t49

    Transverse momentum spectra of $K* + \bar{K}*$ in V0M multiplicity class X

  • Table 50

    Table from Figure 5

    10.17182/hepdata.84282.v1/t50

    Transverse momentum spectra of $\phi$ in V0M multiplicity class I

  • Table 51

    Table from Figure 5

    10.17182/hepdata.84282.v1/t51

    Transverse momentum spectra of $\phi$ in V0M multiplicity class II

  • Table 52

    Table from Figure 5

    10.17182/hepdata.84282.v1/t52

    Transverse momentum spectra of $\phi$ in V0M multiplicity class III

  • Table 53

    Table from Figure 5

    10.17182/hepdata.84282.v1/t53

    Transverse momentum spectra of $\phi$ in V0M multiplicity class IV + V

  • Table 54

    Table from Figure 5

    10.17182/hepdata.84282.v1/t54

    Transverse momentum spectra of $\phi$ in V0M multiplicity class VI

  • Table 55

    Table from Figure 5

    10.17182/hepdata.84282.v1/t55

    Transverse momentum spectra of $\phi$ in V0M multiplicity class VII

  • Table 56

    Table from Figure 5

    10.17182/hepdata.84282.v1/t56

    Transverse momentum spectra of $\phi$ in V0M multiplicity class VIII

  • Table 57

    Table from Figure 5

    10.17182/hepdata.84282.v1/t57

    Transverse momentum spectra of $\phi$ in V0M multiplicity class IX

  • Table 58

    Table from Figure 5

    10.17182/hepdata.84282.v1/t58

    Transverse momentum spectra of $\phi$ in V0M multiplicity class X

  • Table 59

    Table from Figure 6

    10.17182/hepdata.84282.v1/t59

    Unidentified particle spectral modification in V0M Class IX pp collisions.

  • Table 60

    Table from Figure 6

    10.17182/hepdata.84282.v1/t60

    $\pi^{+}+\pi^{-}$ spectral modification in V0M Class IX pp collisions.

  • Table 61

    Table from Figure 6

    10.17182/hepdata.84282.v1/t61

    $K^{+}+K^{-}$ spectral modification in V0M Class IX pp collisions.

  • Table 62

    Table from Figure 6

    10.17182/hepdata.84282.v1/t62

    $p+\bar{p}$ spectral modification in V0M Class IX pp collisions.

  • Table 63

    Table from Figure 6

    10.17182/hepdata.84282.v1/t63

    $\Lambda + \bar{\Lambda}$ spectral modification in V0M Class IX pp collisions.

  • Table 64

    Table from Figure 6

    10.17182/hepdata.84282.v1/t64

    $\Xi^{-} + \bar{\Xi}^{+}$ spectral modification in V0M Class IX pp collisions.

  • Table 65

    Table from Figure 6

    10.17182/hepdata.84282.v1/t65

    $K* + \bar{K}*$ spectral modification in V0M Class IX pp collisions.

  • Table 66

    Table from Figure 6

    10.17182/hepdata.84282.v1/t66

    $\phi$ spectral modification in V0M Class IX pp collisions.

  • Table 67

    Table from Figure 6

    10.17182/hepdata.84282.v1/t67

    Unidentified particle spectral modification in V0M Class I pp collisions.

  • Table 68

    Table from Figure 6

    10.17182/hepdata.84282.v1/t68

    $\pi^{+}+\pi^{-}$ spectral modification in V0M Class I pp collisions.

  • Table 69

    Table from Figure 6

    10.17182/hepdata.84282.v1/t69

    $K^{+}+K^{-}$ spectral modification in V0M Class I pp collisions.

  • Table 70

    Table from Figure 6

    10.17182/hepdata.84282.v1/t70

    $p+\bar{p}$ spectral modification in V0M Class I pp collisions.

  • Table 71

    Table from Figure 6

    10.17182/hepdata.84282.v1/t71

    $\Lambda + \bar{\Lambda}$ spectral modification in V0M Class I pp collisions.

  • Table 72

    Table from Figure 6

    10.17182/hepdata.84282.v1/t72

    $\Xi^{-} + \bar{\Xi}^{+}$ spectral modification in V0M Class I pp collisions.

  • Table 73

    Table from Figure 6

    10.17182/hepdata.84282.v1/t73

    $K* + \bar{K}*$ spectral modification in V0M Class I pp collisions.

  • Table 74

    Table from Figure 6

    10.17182/hepdata.84282.v1/t74

    $\phi$ spectral modification in V0M Class I pp collisions.

  • Table 75

    Table from Figure 7

    10.17182/hepdata.84282.v1/t75

    Transverse momentum dependence of $(p + \bar{p})/\phi$ yield ratios in low multiplicity pp collisions at $\sqrt{s} = 7$ (TeV).

  • Table 76

    Table from Figure 7

    10.17182/hepdata.84282.v1/t76

    Transverse momentum dependence of $(K^{+} + K^{-})/(\pi^{+} + \pi^{-})$ yield ratios in low multiplicity pp collisions at $\sqrt{s} = 7$...

  • Table 77

    Table from Figure 7

    10.17182/hepdata.84282.v1/t77

    Transverse momentum dependence of $(p + \bar{p})/(\pi^{+} + \pi^{-})$ yield ratios in low multiplicity pp collisions at $\sqrt{s} = 7$...

  • Table 78

    Table from Figure 7

    10.17182/hepdata.84282.v1/t78

    Transverse momentum dependence of $\Lambda/K^{0}_{s}$ yield ratios in low multiplicity pp collisions at $\sqrt{s} = 7$ (TeV).

  • Table 79

    Table from Figure 7

    10.17182/hepdata.84282.v1/t79

    Transverse momentum dependence of $(p + \bar{p})/\phi$ yield ratios in high multiplicity pp collisions at $\sqrt{s} = 7$ (TeV).

  • Table 80

    Table from Figure 7

    10.17182/hepdata.84282.v1/t80

    Transverse momentum dependence of $(K^{+} + K^{-})/(\pi^{+} + \pi^{-})$ yield ratios in high multiplicity pp collisions at $\sqrt{s} = 7$...

  • Table 81

    Table from Figure 7

    10.17182/hepdata.84282.v1/t81

    Transverse momentum dependence of $(p + \bar{p})/(\pi^{+} + \pi^{-})$ yield ratios in high multiplicity pp collisions at $\sqrt{s} = 7$...

  • Table 82

    Table from Figure 7

    10.17182/hepdata.84282.v1/t82

    Transverse momentum dependence of $\Lambda/K^{0}_{s}$ yield ratios in high multiplicity pp collisions at $\sqrt{s} = 7$ (TeV).

  • Table 83

    Table from Figure 8

    10.17182/hepdata.84282.v1/t83

    Transverse momentum dependence of $(p + \bar{p})/\phi$ ratio in low-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta...

  • Table 84

    Table from Figure 8

    10.17182/hepdata.84282.v1/t84

    Transverse momentum dependence of $(K^{+} + K^{-})/(\pi^{+} + \pi^{-})$ ratio in low-$p_{T}$ interval in pp collisions as a function of...

  • Table 85

    Table from Figure 8

    10.17182/hepdata.84282.v1/t85

    Transverse momentum dependence of $(p + \bar{p})/(\pi^{+} + \pi^{-})$ ratio in low-$p_{T}$ interval in pp collisions as a function of...

  • Table 86

    Table from Figure 8

    10.17182/hepdata.84282.v1/t86

    Transverse momentum dependence of $\Lambda/K^{0}_{s}$ ratio in low-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta \rangle_{|\eta|<0.5}$.

  • Table 87

    Table from Figure 8

    10.17182/hepdata.84282.v1/t87

    Transverse momentum dependence of $(p + \bar{p})/\phi$ ratio in mid-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta...

  • Table 88

    Table from Figure 8

    10.17182/hepdata.84282.v1/t88

    Transverse momentum dependence of $(K^{+} + K^{-})/(\pi^{+} + \pi^{-})$ ratio in mid-$p_{T}$ interval in pp collisions as a function of...

  • Table 89

    Table from Figure 8

    10.17182/hepdata.84282.v1/t89

    Transverse momentum dependence of $(p + \bar{p})/(\pi^{+} + \pi^{-})$ ratio in mid-$p_{T}$ interval in pp collisions as a function of...

  • Table 90

    Table from Figure 8

    10.17182/hepdata.84282.v1/t90

    Transverse momentum dependence of $\Lambda/K^{0}_{s}$ ratio in mid-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta \rangle_{|\eta|<0.5}$.

  • Table 91

    Table from Figure 8

    10.17182/hepdata.84282.v1/t91

    Transverse momentum dependence of $(p + \bar{p})/\phi$ ratio in high-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta...

  • Table 92

    Table from Figure 8

    10.17182/hepdata.84282.v1/t92

    Transverse momentum dependence of $(K^{+} + K^{-})/(\pi^{+} + \pi^{-})$ ratio in high-$p_{T}$ interval in pp collisions as a function of...

  • Table 93

    Table from Figure 8

    10.17182/hepdata.84282.v1/t93

    Transverse momentum dependence of $(p + \bar{p})/(\pi^{+} + \pi^{-})$ ratio in high-$p_{T}$ interval in pp collisions as a function of...

  • Table 94

    Table from Figure 8

    10.17182/hepdata.84282.v1/t94

    Transverse momentum dependence of $\Lambda/K^{0}_{s}$ ratio in high-$p_{T}$ interval in pp collisions as a function of $\langle dN_{ch}/d\eta \rangle_{|\eta|<0.5}$.

  • Table 95

    Table from Figure 10

    10.17182/hepdata.84282.v1/t95

    Integrated $(K^{+} + K^{-})$/$(\pi^{+} + \pi^{-})$ ratios as a function of $\langle dN_{ch}/d\eta\rangle$ in pp collisions at $\sqrt{s} = 7$...

  • Table 96

    Table from Figure 10

    10.17182/hepdata.84282.v1/t96

    Integrated $(K^{*} + \bar{K}^{*})$/$(\pi^{+} + \pi^{-})$ ratios as a function of $\langle dN_{ch}/d\eta\rangle$ in pp collisions at $\sqrt{s} = 7$...

  • Table 97

    Table from Figure 10

    10.17182/hepdata.84282.v1/t97

    Integrated $\phi$/$(\pi^{+} + \pi^{-})$ ratios as a function of $\langle dN_{ch}/d\eta\rangle$ in pp collisions at $\sqrt{s} = 7$ TeV.

  • Table 98

    Table from Figure 14

    10.17182/hepdata.84282.v1/t98

    $\langle\beta_{T}\rangle$ from blast-wave fit to PbPb collisions at $\sqrt{s}$ = 2.76 TeV

  • Table 99

    Table from Figure 14

    10.17182/hepdata.84282.v1/t99

    $T_{kin}$ from blast-wave fit to PbPb collisions at $\sqrt{s}$ = 2.76 TeV

  • Table 100

    Table from Figure 14

    10.17182/hepdata.84282.v1/t100

    $n$ from blast-wave fit to PbPb collisions at $\sqrt{s}$ = 2.76 TeV

  • Table 101

    Table from Figure 14

    10.17182/hepdata.84282.v1/t101

    $\langle\beta_{T}\rangle$ from blast-wave fit to pPb collisions at $\sqrt{s}$ = 5.02 TeV

  • Table 102

    Table from Figure 14

    10.17182/hepdata.84282.v1/t102

    $T_{kin}$ from blast-wave fit to pPb collisions at $\sqrt{s}$ = 5.02 TeV

  • Table 103

    Table from Figure 14

    10.17182/hepdata.84282.v1/t103

    $n$ from blast-wave fit to pPb collisions at $\sqrt{s}$ = 5.02 TeV

  • Table 104

    Table from Figure 14

    10.17182/hepdata.84282.v1/t104

    $\langle\beta_{T}\rangle$ from blast-wave fit to pp collisions at $\sqrt{s}$ = 7 TeV

  • Table 105

    Table from Figure 14

    10.17182/hepdata.84282.v1/t105

    $T_{kin}$ from blast-wave fit to pp collisions at $\sqrt{s}$ = 7 TeV

  • Table 106

    Table from Figure 14

    10.17182/hepdata.84282.v1/t106

    $n$ from blast-wave fit to pp collisions at $\sqrt{s}$ = 7 TeV

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