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

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10.17182/hepdata.68128.v1/t2

Mean $p_T$, UE charged particles.
Table 3

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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

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10.17182/hepdata.68128.v1/t6

Charged jet rate, $p^\text{ch.jet}_T > 5$ GeV, $|\eta^{ch.jet}| < 1.9$.
Table 7

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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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