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First measurement of large area jet transverse momentum spectra in heavy-ion collisions

The CMS collaboration
FERMILAB-PUB-21-160-CMS, 2021.

Abstract (data abstract)
Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404/μb and 27.4/pb, respectively. Jets with different areas are reconstructed using the anti-kT algorithm by varying the distance parameter R. The measurements are performed using jets with transverse momenta (pT) greater than 200 GeV and in a pseudorapidity range of |eta|< 2. To reveal the medium modification of the jet spectra in PbPb collisions, the properly normalized ratio of spectra from PbPb and pp data is used to extract jet nuclear modification factors as functions of the PbPb collision centrality, pT and, for the first time, as a function of R up to 1.0. For the most central collisions, a strong suppression is observed for high-pT jets reconstructed with all distance parameters, implying that a significant amount of jet energy is scattered to large angles. The dependence of jet suppression on R is expected to be sensitive to both the jet energy loss mechanism and the medium response, and so the data are compared to several modern event generators and analytic calculations. The models considered do not fully reproduce the data.

  • Figure 5-1

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t1

    Spectra of jets with |eta jet| < 2.0 for R = 0.2, for pp collisions and different centrality classes of...

  • Figure 5-2

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t2

    Spectra of jets with |eta jet| < 2.0 for R = 0.3, for pp collisions and different centrality classes of...

  • Figure 5-3

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t3

    Spectra of jets with |eta jet| < 2.0 for R = 0.4, for pp collisions and different centrality classes of...

  • Figure 5-4

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t4

    Spectra of jets with |eta jet| < 2.0 for R = 0.6, for pp collisions and different centrality classes of...

  • Figure 5-5

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t5

    Spectra of jets with |eta jet| < 2.0 for R = 0.8, for pp collisions and different centrality classes of...

  • Figure 5-6

    Data from figure 5 in the paper

    10.17182/hepdata.93881.v1/t6

    Spectra of jets with |eta jet| < 2.0 for R = 1.0, for pp collisions and different centrality classes of...

  • Figure 6

    Data from figure 6 in the paper

    10.17182/hepdata.93881.v1/t7

    The spectra ratio for jets from pp collisions with |eta jet| < 2.0 for R = 0.2–0.8 with respect to...

  • Figure 7-1

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t8

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 0.2 and...

  • Figure 7-2

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t9

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 0.3 and...

  • Figure 7-3

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t10

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 0.4 and...

  • Figure 7-4

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t11

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 0.6 and...

  • Figure 7-5

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t12

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 0.8 and...

  • Figure 7-6

    Data from figure 7 in the paper

    10.17182/hepdata.93881.v1/t13

    The RAA for jets with |eta jet| < 2.0 as a function of jet PT for R = 1.0 and...

  • Figure 8-1

    Data from figure 8 in the paper

    10.17182/hepdata.93881.v1/t14

    The RAA-ratio for jets with |eta jet| < 2.0 as a function of R for R = 0.3–1.0 with respect...

  • Figure 8-2

    Data from figure 8 in the paper

    10.17182/hepdata.93881.v1/t15

    The RAA-ratio for jets with |eta jet| < 2.0 as a function of R for R = 0.3–1.0 with respect...

  • Figure 8-3

    Data from figure 8 in the paper

    10.17182/hepdata.93881.v1/t16

    The RAA-ratio for jets with |eta jet| < 2.0 as a function of R for R = 0.3–1.0 with respect...

  • Figure 8-4

    Data from figure 8 in the paper

    10.17182/hepdata.93881.v1/t17

    The RAA-ratio for jets with |eta jet| < 2.0 as a function of R for R = 0.3–1.0 with respect...

  • Figure 8-5

    Data from figure 8 in the paper

    10.17182/hepdata.93881.v1/t18

    The RAA-ratio for jets with |eta jet| < 2.0 as a function of R for R = 0.3–1.0 with respect...

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