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Study of hard double-parton scattering in four-jet events in $pp$ collisions at $\sqrt{s} = 7$ TeV with the ATLAS experiment

The ATLAS collaboration
No Journal Information, 2016

Abstract (data abstract)
CERN-LHC. Inclusive four-jet events produced in proton--proton collisions at a centre-of-mass energy of sqrt{s} = 7 TeV are analysed for the presence of hard double-parton scattering using data corresponding to an integrated luminosity of 37.3 pb^-1, collected with the ATLAS detector at the LHC. The contribution of hard double-parton scattering to the production of four-jet events is extracted using an artificial neural network, assuming that hard double-parton scattering can be approximated by an uncorrelated overlaying of dijet events. For events containing at least four jets with transverse momentum p_T > 20 GeV and pseudorapidity eta < 4.4, and at least one having p_T > 42.5 GeV, the contribution of hard double-parton scattering is estimated to be f_{DPS} = 0.092 ^{+0.005}_{-0.011} (stat.) ^{+0.033}_{-0.037} (syst.). After combining this measurement with those of the inclusive dijet and four-jet cross-sections in the appropriate phase space regions, the effective overlap area between the interacting protons, sigma_{eff}, was determined to be sigma_{eff} = 14.9 ^{+1.2}_{-1.0} (stat.) ^{+5.1}_{-3.8} (syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of sigma_{eff}, performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21^{+7}_{-6}% of the total inelastic cross-section measured at sqrt{s} = 7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.

  • Table 1

    Data from Figure 10(a)

    10.17182/hepdata.73908.v1/t1

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{34}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 2

    Data from Figure 10(b)

    10.17182/hepdata.73908.v1/t2

    Normalized distribution of the variable $\Delta\phi_{34}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 3

    Data from Figure 11(a)

    10.17182/hepdata.73908.v1/t3

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{12}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 4

    Data from Figure 11(b)

    10.17182/hepdata.73908.v1/t4

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{13}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 5

    Data from Figure 11(c)

    10.17182/hepdata.73908.v1/t5

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{23}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 6

    Data from Figure 11(d)

    10.17182/hepdata.73908.v1/t6

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{14}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 7

    Data from Figure 12(a)

    10.17182/hepdata.73908.v1/t7

    Normalized distribution of the variable $\Delta^{p_{\mathrm{T}}}_{24}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 8

    Data from Figure 12(b)

    10.17182/hepdata.73908.v1/t8

    Normalized distribution of the variable $\Delta\phi_{12}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 9

    Data from Figure 12(c)

    10.17182/hepdata.73908.v1/t9

    Normalized distribution of the variable $\Delta\phi_{13}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 10

    Data from Figure 12(d)

    10.17182/hepdata.73908.v1/t10

    Normalized distribution of the variable $\Delta\phi_{23}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 11

    Data from Figure 13(a)

    10.17182/hepdata.73908.v1/t11

    Normalized distribution of the variable $\Delta\phi_{14}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 12

    Data from Figure 13(b)

    10.17182/hepdata.73908.v1/t12

    Normalized distribution of the variable $\Delta\phi_{24}$, defined in Eq (16) of the paper, in data after unfolding to particle level.

  • Table 13

    Data from Figure 13(c)

    10.17182/hepdata.73908.v1/t13

    Normalized distribution of the variable $\Delta y_{12}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 14

    Data from Figure 13(d)

    10.17182/hepdata.73908.v1/t14

    Normalized distribution of the variable $\Delta y_{34}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 15

    Data from Figure 14(a)

    10.17182/hepdata.73908.v1/t15

    Normalized distribution of the variable $\Delta y_{13}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 16

    Data from Figure 14(b)

    10.17182/hepdata.73908.v1/t16

    Normalized distribution of the variable $\Delta y_{23}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 17

    Data from Figure 14(c)

    10.17182/hepdata.73908.v1/t17

    Normalized distribution of the variable $\Delta y_{14}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 18

    Data from Figure 14(d)

    10.17182/hepdata.73908.v1/t18

    Normalized distribution of the variable $\Delta y_{24}$, defined in Eq (16) of the paper, in data after unfolding to particle...

  • Table 19

    Data from Figure 15(a)

    10.17182/hepdata.73908.v1/t19

    Normalized distribution of the variable $\phi_{1+2} - \phi_{3+4}$, defined in Eq (16) of the paper, in data after unfolding to...

  • Table 20

    Data from Figure 15(b)

    10.17182/hepdata.73908.v1/t20

    Normalized distribution of the variable $\phi_{1+3} - \phi_{2+4}$, defined in Eq (16) of the paper, in data after unfolding to...

  • Table 21

    Data from Figure 15(c)

    10.17182/hepdata.73908.v1/t21

    Normalized distribution of the variable $\phi_{1+4} - \phi_{2+3}$, defined in Eq (16) of the paper, in data after unfolding to...

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