I should say, one can argue for both 15 mb and 6.3 mb as σ_eff. Here's a nice summary of previous measurements of this quantity from a previous ATLAS paper (https://t.co/iI5vMBhjfo): https://t.co/Y2jzN36ugH
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Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at s=8 TeV with the ATLAS detector https://t.co/FxEbiszdP9 via @ElsevierPhysics https://t.co/9Jqu69fXtt
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"Study of the hard double-parton scattering contribution to inclusive four-lepton production in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector" https://t.co/ZN2INK0sH3 #physicspapers
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Study of the hard double-parton scattering contribution to inclusive four-lepton production in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector. https://t.co/MbgRbT7UTc