Production of muons from heavy-flavour hadron decays in pp collisions at $\sqrt{s}$ = 5.02 TeV

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Production cross sections of muons from semi-leptonic decays of charm and beauty hadrons were measured at forward rapidity ($2.5<~y<~4$) in proton--proton (pp) collisions at a centre-of-mass energy $\sqrt{s}=5.02$ TeV with the ALICE detector at the CERN LHC. The results were obtained in an extended transverse momentum interval, $2 <~ p_{\rm T} <~ 20$ GeV/$c$, and with an improved precision compared to previous measurements performed in the same rapidity interval at centre-of-mass energies $\sqrt{s}= 2.76$ and 7 TeV. The $p_{\rm T}$- and $y$-differential production cross sections as well as the $p_{\rm T}$-differential production cross section ratios between different centre-of-mass energies and different rapidity intervals are described, within experimental and theoretical uncertainties, by predictions based on perturbative QCD.

 

JHEP (2019) 2019: 8
HEP Data
e-Print: arXiv:1905.07207 | PDF | inSPIRE
CERN-EP-2019-078

Figure 1

Product of acceptance and efficiency as a function of generated $\pT$ estimated from a Monte Carlo simulation of muons from charm and beauty decays.

Figure 2

Estimated background fractions with respect to inclusive muons as a function of $\pT$ for the rapidity interval $2.5 < y < 4$ in pp collisions at $\sqrt s$ = 5.02 TeV. Statistical uncertainties (vertical bars) and systematic uncertainties (boxes) are shown.

Figure 3

$\pT$-differential production cross section of muons from heavy-flavour hadron decays at forward rapidity in pp collisions at $\sqrt s$ = 5.02 TeV. Statistical uncertainties (bars) and systematic uncertainties (boxes) are shown. The production cross section is compared with FONLL predictions~ (top). The ratio of the data to FONLL calculations is shown in the lower panel. See the text for details.

Figure 4

Production cross section of muons from heavy-flavour hadron decays as a function of rapidity in pp collisions at $\sqrt s$ = 5.02 TeV for the $\pT$~intervals $2 < p_{\rm T} < 7$~GeV/$c$ (left) and $7 < p_{\rm T} < 20$~GeV/$c$ (right). Statistical uncertainties (bars, smaller than symbols) and systematic uncertainties (boxes) are drawn. The production cross sections arecompared with FONLL predictions~ (top). The ratios of the data to FONLL calculations are shown in the lower panels. See the text for details.

Figure 5

Upper panel: $\pT$-differential production cross section of muons from heavy-flavour hadron decays for five rapidity intervals in the range $2.5 < y < 4$ in pp collisions at $\sqrt s$ = 5.02 TeV. Statistical uncertainties (bars) and systematic uncertainties (boxes) are shown. The production cross sections are compared with FONLL predictions~. Bottom panel: ratios of the data to FONLL calculations. See the text for details.

Figure 6

Ratio of the $\pT$-differential production cross section of muons from heavy-flavour hadron decays at forward rapidity in pp collisions at $\sqrt s$ = 7 TeV to that at $\sqrt s$ = 5.02 TeV. Statistical uncertainties (bars) and systematic uncertainties (boxes) are shown. The normalisation uncertainty contains the uncertainties on the luminosity at the two centre-of mass energies. The ratio is compared with FONLL predictions~. See the text for details.

Figure 7

Ratio of the $\pT$-differential production cross section of muons from heavy-flavour hadron decays in $3.7 < y < 4$ to that in $2.5 < y < 2.8$ in pp collisions at $\sqrt s$ = 5.02 TeV. Statistical uncertainties (bars) and systematic uncertainties (boxes) are shown. The ratio is compared with FONLL predictions~. See the text for details.