Jet and underlying event properties as a function of particle multiplicity in proton-proton collisions at sqrt(s) = 7 TeV

The collaboration
Eur.Phys.J.C 73 (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.

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10.17182/hepdata.68128.v1/t2

Mean $p_T$, UE charged particles.

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10.17182/hepdata.68128.v1/t3

Mean $p_T$, in-jet charged particles.

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10.17182/hepdata.68128.v1/t4

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

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10.17182/hepdata.68128.v1/t5

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

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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

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

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10.17182/hepdata.68128.v1/t10

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

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Data from ?

10.17182/hepdata.68128.v1/t11

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

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Data from ?

10.17182/hepdata.68128.v1/t12

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

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10.17182/hepdata.68128.v1/t13

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

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10.17182/hepdata.68128.v1/t14

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

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10.17182/hepdata.68128.v1/t15

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

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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, $110 < N_\text{ch} \le 140$.