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

The 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.