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Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at $\sqrt{s}=7$ TeV

The CMS collaboration
Eur.Phys.J. C72 (2012) 2080, 2012

Abstract (data abstract)
CERN-LHC. A measurement of the underlying event (UE) activity in proton-proton collisions at a center-of-mass energy of 7 TeV is performed using Drell--Yan events in a data sample corresponding to an integrated luminosity of 2.2 inverse femtobarns, collected by the CMS experiment at the LHC. The activity measured in the muonic final state (q q-bar to opposite-sign muons) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by PYTHIA and HERWIG++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV, while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by MADGRAPH, which simulates multiple hard emissions. Data taken from the RIVET analysis code.

  • Table 1

    Data from ?

    10.17182/hepdata.68072.v1/t1

    Toward $N_\text{chg}$ density vs $p_\perp^{\mu\mu}$.

  • Table 2

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    10.17182/hepdata.68072.v1/t2

    Transverse $N_\text{chg}$ density vs $p_\perp^{\mu\mu}$.

  • Table 3

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    10.17182/hepdata.68072.v1/t3

    Away $N_\text{chg}$ density vs $p_\perp^{\mu\mu}$.

  • Table 4

    Data from ?

    10.17182/hepdata.68072.v1/t4

    Toward $\sum p_\perp$ density vs $p_\perp^{\mu\mu}$.

  • Table 5

    Data from ?

    10.17182/hepdata.68072.v1/t5

    Transverse $\sum p_\perp$ density vs $p_\perp^{\mu\mu}$.

  • Table 6

    Data from ?

    10.17182/hepdata.68072.v1/t6

    Away $\sum p_\perp$ density vs $p_\perp^{\mu\mu}$.

  • Table 7

    Data from ?

    10.17182/hepdata.68072.v1/t7

    Toward $\langle p_\perp \rangle$ vs $p_\perp^{\mu\mu}$.

  • Table 8

    Data from ?

    10.17182/hepdata.68072.v1/t8

    Transverse $\langle p_\perp \rangle$ vs $p_\perp^{\mu\mu}$.

  • Table 9

    Data from ?

    10.17182/hepdata.68072.v1/t9

    Away $\langle p_\perp \rangle$ vs $p_\perp^{\mu\mu}$.

  • Table 10

    Data from ?

    10.17182/hepdata.68072.v1/t10

    Towards $+$ transverse $N_\text{chg}$ density vs $m_{\mu\mu}$, $p_\perp^{\mu\mu} < 5$ GeV.

  • Table 11

    Data from ?

    10.17182/hepdata.68072.v1/t11

    Towards $+$ transverse $\sum p_\perp$ density vs $m_{\mu\mu}$, $p_\perp^{\mu\mu} < 5$ GeV.

  • Table 12

    Data from ?

    10.17182/hepdata.68072.v1/t12

    Towards $+$ transverse $\langle p_\perp \rangle$ vs $m_{\mu\mu}$, $p_\perp^{\mu\mu} < 5$ GeV.

  • Table 13

    Data from ?

    10.17182/hepdata.68072.v1/t13

    Toward $N_\text{chg}$.

  • Table 14

    Data from ?

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    Transverse $N_\text{chg}$.

  • Table 15

    Data from ?

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    Away $N_\text{chg}$.

  • Table 16

    Data from ?

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    Toward $p_\perp$.

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    Data from ?

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    Transverse $p_\perp$.

  • Table 18

    Data from ?

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    Away $p_\perp$.

  • Table 19

    Data from ?

    10.17182/hepdata.68072.v1/t19

    Transverse $N_\text{chg}$, $p_\perp(\mu\mu) < 5$ GeV.

  • Table 20

    Data from ?

    10.17182/hepdata.68072.v1/t20

    Transverse $p_\perp$, $p_\perp(\mu\mu) < 5$ GeV.

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