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Transverse momentum spectra of inclusive b jets in pPb collisions at $\sqrt{s_{NN}} =$ 5.02 TeV

The collaboration
Phys.Lett. B754 (2016) 59, 2016

Abstract (data abstract)
CERN-LHC. We present a measurement of b jet transverse momentum (pt) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 inverse nanobarns collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon collisions and are compared to a reference obtained from PYTHIA simulations of pp collisions. The PYTHIA-based estimate of the nuclear modification factor is found to be 1.22 +/- 0.15 (stat + syst pPb) +/- 0.27 (syst PYTHIA) averaged over all jets with pt between 55 and 400 GeV/c and with abs(eta[lab]) < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.

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Data from Figure 1, Left

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Distributions of the JP tagger discriminator before applying the SSV tagger selection.

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Data from Figure 1, Right

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Distributions of the JP tagger discriminator after applying the SSV tagger selection.

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Data from Figure 2, Left

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Distributions of the b-tagging efficiency as a function of the mistag rate of light jets for pp collisions in a...

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Data from Figure 2, Left

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Distributions of the b-tagging efficiency as a function of the mistag rate of charm jets for pp collisions in a...

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Data from Figure 2, Left

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Distributions of the b-tagging efficiency as a function of the mistag rate of light jets for pPb collisions in a...

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Data from Figure 2, Left

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Distributions of the b-tagging efficiency as a function of the mistag rate of charm jets for pPb collisions in a...

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Data from Figure 2, Right

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Distributions of the Secondary Vertex Mass after applying the SSV tagger selection.

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Data from Figure 3, Left

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b-jet cross-sections in pPb, scaled by the Glauber nuclear overlap function, as well as a b-jet cross-section from a PYTHIA...

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Data from Figure 3, Left

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b-jet cross-sections in pPb, scaled by the Glauber nuclear overlap function, as well as a b-jet cross-section from a PYTHIA...

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Data from Figure 3, Left

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b-jet cross-sections in pPb, scaled by the Glauber nuclear overlap function, as well as a b-jet cross-section from a PYTHIA...

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Data from Figure 3, Left

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b-jet cross-sections in pPb, scaled by the Glauber nuclear overlap function, as well as a b-jet cross-section from a PYTHIA...

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Data from Figure 3, Right, Top Panel

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b-jet RpA (PYTHIA) from 0.5 < eta_CM < 1.5.

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Data from Figure 3, Right, 2nd Panel from Top

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b-jet RpA (PYTHIA) from -0.5 < eta_CM < 0.5.

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Data from Figure 3, Right, 3rd Panel from Top

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b-jet RpA (PYTHIA) from -1.5 < eta_CM < -0.5.

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Data from Figure 3, Right, Bottom Panel

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b-jet RpA (PYTHIA) from -2.5 < eta_CM < -1.5.

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Data from Figure 4

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b-jet Fraction.

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Data from Figure 5

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b-jet RpA(PYTHIA).