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Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV

The ALICE collaboration
CERN-EP-2020-059, 2020.

Abstract (data abstract)
The production of $\pi^{\pm}$, $\mathrm{K}^{\pm}$, $\mathrm{K_{S}^{0}}$, $\mathrm{K^{*}(892)^{0}}$, ${\rm p}$, ${\rm \overline{p}}$, $\phi(1020)$, $\Lambda$, $\overline{\Lambda}$, $\Xi^{-}$, $\overline{\Xi}^{+}$, $\Omega^{-}$, and $\overline{\Omega}^{+}$ was measured in inelastic proton--proton (pp) collisions at a center-of-mass energy of $\sqrt{s}=$ 13 TeV at midrapidity ($|y|<0.5$) as a function of transverse momentum ($p_{\mathrm{T}}$) using the ALICE detector at the CERN LHC. Furthermore, the single-particle $p_{\mathrm{T}}$ distributions of $\mathrm{K_{S}^{0}}$, $\Lambda$, and $\overline{\Lambda}$, in inelastic pp collisions at $\sqrt{s}=$ 7 TeV are reported here for the first time. The $p_{\mathrm{T}}$ distributions are studied at midrapidity within the transverse momentum range $0\leq p_{\mathrm{T}} \leq 20$ GeV/$c$, depending on the particle species. The $p_{\mathrm{T}}$ spectra, integrated yields, and particle yield ratios are discussed as a function of collision energy and compared with measurements at lower $\sqrt{s}$ and with results from various general-purpose QCD-inspired Monte Carlo models. A hardening of the spectra at high $p_{\mathrm{T}}$ with increasing collision energy is observed, which is similar for all particle species under study. The measured $p_{\mathrm{T}}$ spectra of mesons for $p_{\mathrm{T}}<2$ GeV/$c$ significantly deviate from the empirical transverse mass scaling relation based on the measured charged pion spectrum. The empirical $x_{\mathrm{T}}\equiv 2p_{\mathrm{T}}/\sqrt{s}$ scaling for $\pi^{\pm}$, $\mathrm{K}^{\pm}$, $\mathrm{K^{*0}}$ and ${\rm p}({\rm \overline{p}})$ is well satisfied in the hard scattering region of particle production. As the collision energy increases from $\sqrt{s}=$ 7 TeV to 13 TeV, the yields of non- and single-strange hadrons normalized to the pion yields remain approximately constant as a function of $\sqrt{s}$, while ratios for multi-strange hadrons indicate enhancements. The $p_{\mathrm{T}}$-differential cross sections of $\pi^{\pm}$, $\mathrm{K}^{\pm}$, and ${\rm p}({\rm \overline{p}})$ are compared with next-to-leading order perturbative QCD calculations, which are found to overestimate the cross sections for $\pi^{\pm}$ and ${\rm p}({\rm \overline{p}})$ at high $p_{\mathrm{T}}$.

  • Table 1

    Data from Figure 5

    10.17182/hepdata.100303.v1/t1

    Transverse momentum spectrum of $\pi^{+} + \pi^{-}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 2

    Data from Figure 5

    10.17182/hepdata.100303.v1/t2

    Transverse momentum spectrum of $K^{+} + K^{-}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 3

    Data from Figure 5

    10.17182/hepdata.100303.v1/t3

    Transverse momentum spectrum of $K^{0}_{S}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV. The normalization...

  • Table 4

    Data from Figure 5

    10.17182/hepdata.100303.v1/t4

    Transverse momentum spectrum of $K^{*0} + \overline{K^{*0}}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 5

    Data from Figure 5

    10.17182/hepdata.100303.v1/t5

    Transverse momentum spectrum of $\phi$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV. The normalization...

  • Table 6

    Data from Figure 5

    10.17182/hepdata.100303.v1/t6

    Transverse momentum spectrum of $p + \overline{p}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 7

    Data from Figure 5

    10.17182/hepdata.100303.v1/t7

    Transverse momentum spectrum of $\Lambda + \overline{\Lambda}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 8

    Data from Figure 5

    10.17182/hepdata.100303.v1/t8

    Transverse momentum spectrum of $\Xi^{-} + \overline{\Xi}^{+}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 9

    Data from Figure 5

    10.17182/hepdata.100303.v1/t9

    Transverse momentum spectrum of $\Omega^{-} + \overline{\Omega}^{+}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 13 TeV....

  • Table 10

    Data from Figure 5

    10.17182/hepdata.100303.v1/t10

    Transverse momentum spectrum of $K^{0}_{S}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 7 TeV. The normalization...

  • Table 11

    Data from Figure 5

    10.17182/hepdata.100303.v1/t11

    Transverse momentum spectrum of $\Lambda + \overline{\Lambda}$ measured at midrapidity ($|y|<0.5$) in inelastic pp collisions at $\sqrt{s}$ = 7 TeV....

  • Table 12

    Data from Figure 6

    10.17182/hepdata.100303.v1/t12

    Ratios of the transverse-momentum spectra of $\pi^{+} + \pi^{-}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 13

    Data from Figure 6

    10.17182/hepdata.100303.v1/t13

    Ratios of the transverse-momentum spectra of $K^{+} + K^{-}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 14

    Data from Figure 6

    10.17182/hepdata.100303.v1/t14

    Ratios of the transverse-momentum spectra of $K^{0}_{S}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$ TeV. The...

  • Table 15

    Data from Figure 6

    10.17182/hepdata.100303.v1/t15

    Ratios of the transverse-momentum spectra of $K^{*0} + \overline{K^{*0}}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 16

    Data from Figure 6

    10.17182/hepdata.100303.v1/t16

    Ratios of the transverse-momentum spectra of $\phi$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$ TeV. The...

  • Table 17

    Data from Figure 6

    10.17182/hepdata.100303.v1/t17

    Ratios of the transverse-momentum spectra of $p + \overline{p}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 18

    Data from Figure 6

    10.17182/hepdata.100303.v1/t18

    Ratios of the transverse-momentum spectra of $\Lambda + \overline{\Lambda}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 19

    Data from Figure 6

    10.17182/hepdata.100303.v1/t19

    Ratios of the transverse-momentum spectra of $\Xi^{-} + \overline{\Xi}^{+}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 20

    Data from Figure 6

    10.17182/hepdata.100303.v1/t20

    Ratios of the transverse-momentum spectra of $\Omega^{-} + \overline{\Omega}^{+}$ in inelastic pp collisions at $\sqrt{s}=13$ TeV to those for $\sqrt{s}={7}$...

  • Table 21

    Data from Figure 8

    10.17182/hepdata.100303.v1/t21

    $(K^{+} + K^{-})/(\pi^{+}+\pi^{-})$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 22

    Data from Figure 8

    10.17182/hepdata.100303.v1/t22

    $(K^{*0} + \overline{K^{*0}})/(\pi^{+}+\pi^{-})$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 23

    Data from Figure 8

    10.17182/hepdata.100303.v1/t23

    $K^{0}_{S}/(\pi^{+}+\pi^{-})$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 24

    Data from Figure 8

    10.17182/hepdata.100303.v1/t24

    $\phi/(\pi^{+}+\pi^{-})$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 25

    Data from Figure 8

    10.17182/hepdata.100303.v1/t25

    $\phi/(\pi^{+}+\pi^{-})$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 7 TeV.

  • Table 26

    Data from Figure 10

    10.17182/hepdata.100303.v1/t26

    Average transverse momentum of $\pi^{+}+\pi^{-}$ as a function of the center-of-mass energy.

  • Table 27

    Data from Figure 10

    10.17182/hepdata.100303.v1/t27

    Average transverse momentum of $K^{+} + K^{-}$ as a function of the center-of-mass energy.

  • Table 28

    Data from Figure 10

    10.17182/hepdata.100303.v1/t28

    Average transverse momentum of $K^{0}_{S}$ as a function of the center-of-mass energy.

  • Table 29

    Data from Figure 10

    10.17182/hepdata.100303.v1/t29

    Average transverse momentum of $K^{*0} + \overline{K^{*0}}$ as a function of the center-of-mass energy.

  • Table 30

    Data from Figure 10

    10.17182/hepdata.100303.v1/t30

    Average transverse momentum of $\phi$ as a function of the center-of-mass energy.

  • Table 31

    Data from Figure 10

    10.17182/hepdata.100303.v1/t31

    Average transverse momentum of $p + \overline{p}$ as a function of the center-of-mass energy.

  • Table 32

    Data from Figure 10

    10.17182/hepdata.100303.v1/t32

    Average transverse momentum of $\Lambda+\overline{\Lambda}$ as a function of the center-of-mass energy.

  • Table 33

    Data from Figure 10

    10.17182/hepdata.100303.v1/t33

    Average transverse momentum of $\Xi^{-} + \overline{\Xi}^{+}$ as a function of the center-of-mass energy.

  • Table 34

    Data from Figure 10

    10.17182/hepdata.100303.v1/t34

    Average transverse momentum of $\Omega^{-} + \overline{\Omega}^{+}$ as a function of the center-of-mass energy.

  • Table 35

    Data from Figure 11

    10.17182/hepdata.100303.v1/t35

    Ratio of $p_{\rm T}$-integrated yields of $K^{+} + K^{-}$ to $\pi^{+} + \pi^{-}$ as a function of the center-of-mass energy.

  • Table 36

    Data from Figure 11

    10.17182/hepdata.100303.v1/t36

    Ratio of $p_{\rm T}$-integrated yields of $p + \overline{p}$ to $\pi^{+} + \pi^{-}$ as a function of the center-of-mass energy.

  • Table 37

    Data from Figure 11

    10.17182/hepdata.100303.v1/t37

    Ratio of $p_{\rm T}$-integrated yields of $\Lambda+\overline{\Lambda}$ to $\pi^{+} + \pi^{-}$ as a function of the center-of-mass energy.

  • Table 38

    Data from Figure 11

    10.17182/hepdata.100303.v1/t38

    Ratio of $p_{\rm T}$-integrated yields of $\Xi^{-} + \overline{\Xi}^{+}$ to $\pi^{+} + \pi^{-}$ as a function of the center-of-mass energy.

  • Table 39

    Data from Figure 11

    10.17182/hepdata.100303.v1/t39

    Ratio of $p_{\rm T}$-integrated yields of $\Omega^{-} + \overline{\Omega}^{+}$ to $\pi^{+} + \pi^{-}$ as a function of the center-of-mass energy.

  • Table 40

    Data from Figure 11

    10.17182/hepdata.100303.v1/t40

    Ratio of $p_{\rm T}$-integrated yields of $\phi$ to $K^{+} + K^{-}$ as a function of the center-of-mass energy.

  • Table 41

    Data from Figure 11

    10.17182/hepdata.100303.v1/t41

    Ratio of $p_{\rm T}$-integrated yields of $K^{*0} + \overline{K^{*0}}$ to $K^{+} + K^{-}$ as a function of the center-of-mass energy.

  • Table 42

    Data from Figure 13

    10.17182/hepdata.100303.v1/t42

    $(p + \overline{p})$/($\pi^{+}+\pi^{-}$) particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 43

    Data from Figure 13

    10.17182/hepdata.100303.v1/t43

    $(\Lambda + \overline{\Lambda})/K^{0}_{S}$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 44

    Data from Figure 13

    10.17182/hepdata.100303.v1/t44

    $(\Omega^{-} + \overline{\Omega}^{+})/\phi$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 45

    Data from Figure 13

    10.17182/hepdata.100303.v1/t45

    $(\Xi^{-} + \overline{\Xi}^{+})/\phi$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 13 TeV.

  • Table 46

    Data from Figure 13

    10.17182/hepdata.100303.v1/t46

    $(\Omega^{-} + \overline{\Omega}^{+})/\phi$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 7 TeV.

  • Table 47

    Data from Figure 13

    10.17182/hepdata.100303.v1/t47

    $(\Xi^{-} + \overline{\Xi}^{+})/\phi$ particle ratio as a function of $p_{\rm T}$ measured in pp collisions at $\sqrt{s}$ = 7 TeV.

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