Measurement of inclusive charged-particle b-jet production in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

The collaboration
JHEP 01 (2022) 178, 2022.

Abstract (data abstract)
A measurement of the inclusive b-jet production cross section is presented in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}~=0.5~$TeV, using data collected with the ALICE detector at the LHC. The jets were reconstructed in the central rapidity region $|\eta|<0.5$ from charged particles using the anti-$k_{\rm T}$ algorithm with resolution parameter $R=0.4$. Identification of b jets exploits the long lifetime of b-hadrons, using the properties of secondary vertices and impact parameter distributions. The $p_\mathrm{T}$-differential inclusive production cross section of b jets, as well as the corresponding inclusive b-jet fraction, are reported for pp and p-Pb collisions in the jet transverse momentum range $10 \le p_\mathrm{T,ch\,jet} \le 100$ GeV/$c$, together with the nuclear modification factor, $R_{\rm pPb}^\text{b-jet}$. The analysis thus extends the lower $p_\mathrm{T}$ limit of b-jet measurements at the LHC. The nuclear modification factor is found to be consistent with unity, indicating that the production of b jets in p-Pb at $\sqrt{s_{\mathrm{NN}}}~=0.5~$TeV is not affected by cold nuclear matter effects within the current precision. The measurements are well reproduced by POWHEG NLO pQCD calculations with PYTHIA fragmentation.

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Fig. 11 left: The $p_\mathrm{T}$ differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in pp collisions at $\sqrt{s}~=~5.02$...

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Table from Figure 11

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Fig. 11 left: The $p_\mathrm{T}$ differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in pp collisions at $\sqrt{s}~=~5.02$...

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Table from Figure 11

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Fig. 11 right: The $p_\mathrm{T}$ differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}~=~5.02$...

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Table from Figure 11

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Fig. 11 right: The $p_\mathrm{T}$ differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}~=~5.02$...

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Table from Figure 12

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Fig. 12 left: The combined differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in pp collisions at $\sqrt{s}~=~5.02$...

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Table from Figure 12

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Fig. 12 right: The combined differential production cross section of charged-particle anti-$k_{T}$ $R=0.4$ b jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}~=~5.02$...

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Table from Figure 13

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Fig. 13 left: The b-jet fraction in pp collisions at $\sqrt{s}~=~5.02$ TeV.

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Fig. 13 right: The b-jet fraction in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}~=~5.02$ TeV.

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Table from Figure 14

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Fig. 14 left: The nuclear modification factor $R_{\mathrm{pPb}}$ of b jets as a function of $P_T$ from the SV method.

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Table from Figure 14

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Fig. 14 left: The nuclear modification factor $R_{\mathrm{pPb}}$ of b jets as a function of $P_T$ from the IP method.

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Table from Figure 14

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Fig. 14 right: The combined nuclear modification factor $R_{\mathrm{pPb}}$ of b jets as a function of $P_T$.