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Jet and underlying event properties as a function of charged-particle multiplicity in proton–proton collisions at $\sqrt{s}$ = 7 TeV

The CMS collaboration
Eur.Phys.J. C73 (2013) 2674, 2013

Abstract (data abstract)
CERN-LHC. Characteristics of multi-particle production in proton-proton collisions at $\sqrt{s}$=7 TeV are studied as a function of the charged-particle multiplicity, $N_{ch}$. The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity |??|<2.4 and transverse momentum $p_T$ > 0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have $p_T$ > 5 GeV/c. The distributions of jet $p_T$, average $p_T$ of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of $N_{ch}$ and compared to the predictions of the PYTHIA and HERWIG event generators. Predictions without multi-parton interactions fail completely to describe the $N_{ch}$-dependence observed in the data. For increasing $N_{ch}$, PYTHIA systematically predicts higher jet rates and harder $p_T$ spectra than seen in the data, whereas HERWIG shows the opposite trends. At the highest multiplicity, the data?EUR"model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients. Data taken from the RIVET analysis code.

  • Table 1

    Data from ?

    10.17182/hepdata.68128.v1/t1

    Mean $p_T$, all charged particles.

  • Table 2

    Data from ?

    10.17182/hepdata.68128.v1/t2

    Mean $p_T$, UE charged particles.

  • Table 3

    Data from ?

    10.17182/hepdata.68128.v1/t3

    Mean $p_T$, in-jet charged particles.

  • Table 4

    Data from ?

    10.17182/hepdata.68128.v1/t4

    Mean $p_T$, leading in-jet charged particle.

  • Table 5

    Data from ?

    10.17182/hepdata.68128.v1/t5

    Mean $p_T$, charged particle jets, $p^{ch.jet}_T > 5$ GeV, $|\eta^{ch.jet}| < 1.9$.

  • Table 6

    Data from ?

    10.17182/hepdata.68128.v1/t6

    Charged jet rate, $p^\text{ch.jet}_T > 5$ GeV, $|\eta^{ch.jet}| < 1.9$.

  • Table 7

    Data from ?

    10.17182/hepdata.68128.v1/t7

    Charged jet rate, $p^\text{ch.jet}_T > 30$ GeV, $|\eta^{ch.jet}| < 1.9$.

  • Table 8

    Data from ?

    10.17182/hepdata.68128.v1/t8

    Jet $p_T$ spectrum, $|\eta^{ch.jet}| < 1.9$, $10 < N_\text{ch} \le 30$.

  • Table 9

    Data from ?

    10.17182/hepdata.68128.v1/t9

    Jet $p_T$ spectrum, $|\eta^{ch.jet}| < 1.9$, $30 < N_\text{ch} \le 50$.

  • Table 10

    Data from ?

    10.17182/hepdata.68128.v1/t10

    Jet $p_T$ spectrum, $|\eta^{ch.jet}| < 1.9$, $50 < N_\text{ch} \le 80$.

  • Table 11

    Data from ?

    10.17182/hepdata.68128.v1/t11

    Jet $p_T$ spectrum, $|\eta^{ch.jet}| < 1.9$, $80 < N_\text{ch} \le 110$.

  • Table 12

    Data from ?

    10.17182/hepdata.68128.v1/t12

    Jet $p_T$ spectrum, $|\eta^{ch.jet}| < 1.9$, $110 < N_\text{ch} \le 140$.

  • Table 13

    Data from ?

    10.17182/hepdata.68128.v1/t13

    Intrajet ring $p_{T}$ density, $10 < N_\text{ch} \le 30$.

  • Table 14

    Data from ?

    10.17182/hepdata.68128.v1/t14

    Intrajet ring $p_{T}$ density, $30 < N_\text{ch} \le 50$.

  • Table 15

    Data from ?

    10.17182/hepdata.68128.v1/t15

    Intrajet ring $p_{T}$ density, $50 < N_\text{ch} \le 80$.

  • Table 16

    Data from ?

    10.17182/hepdata.68128.v1/t16

    Intrajet ring $p_{T}$ density, $80 < N_\text{ch} \le 110$.

  • Table 17

    Data from ?

    10.17182/hepdata.68128.v1/t17

    Intrajet ring $p_{T}$ density, $110 < N_\text{ch} \le 140$.

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