Abstract
A measurement of the inclusive b-jet production cross section is presented in pp and p-Pb collisions at sqrt{s_{mathrm{NN}}} = 5.02 TeV, using data collected with the ALICE detector at the LHC. The jets were reconstructed in the central rapidity region |η| < 0.5 from charged particles using the anti-kT 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 pT-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 ≤ pT,ch jet≤ 100 GeV/c, together with the nuclear modification factor, {R}_{mathrm{pPb}}^{mathrm{b}-mathrm{jet}} . The analysis thus extends the lower pT 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}}} = 5.02 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.
Highlights
Charm and beauty quarks arise from hard scattering processes with large four-momentum transfer (Q2)
In case of proton-proton collisions, the inclusive production cross section of heavy-flavor hadrons can be calculated with perturbative quantum chromodynamics (QCD) using the factorization approach, which assumes that the collision process can be described by a convolution of parton distribution functions (PDFs), a short-distance parton-level cross section, and a fragmentation function
The concept of the QCD factorization is often extrapolated to proton-nucleus collisions by replacing the usual PDFs with nuclear PDFs, while keeping the short-distance parton-level cross section and the fragmentation function the same [4,5,6,7,8,9]
Summary
Charm and beauty quarks arise from hard scattering processes with large four-momentum transfer (Q2). Since heavy-flavor quarks are mainly produced in initial hard processes and since their numbers remain largely unchanged in the later stages of the reaction [33, 34], they provide a unique opportunity to study the spacetime evolution of the QGP In this context, small collision systems represent an important test for theoretical models that account for the system-size-dependent evolution of the QGP signatures as well as CNM effects. ICE detector has excellent tracking capabilities for low-pT charged particles, which makes it possible to measure b jets at low transverse momenta This provides a unique opportunity at the LHC to study nuclear modification of b jets down to the region where the energy scale of the jets is of similar magnitude compared to the b-quark mass, which increases sensitivity to mass dependent effects.
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