Towards a Precise Parton Luminosity Determination at the CERN LHC

Details Towards a Precise Parton Luminosity Determination at the CERN LHC Towards a Precise Parton Luminosity Determination at the CERN LHC

1997-05-07

arxiv.org/abs/hep-ex/9705004v1

Phys.Rev.D56:7284-7290,1997

Physics

High Energy Physics

High Energy Physics - Experiment

plain tex, 14 pages, 5 figures

Scientific paper

10.1103/PhysRevD.56.7284

A new approach to determine the LHC luminosity is investigated. Instead of employing the proton-proton luminosity measurement, we suggest to measure directly the parton-parton luminosity. It is shown that the electron and muon pseudorapidity distributions, originating from the decay of W+, W- and Z0 bosons produced at 14 TeV pp collisions (LHC), constrain the x distributions of sea and valence quarks and antiquarks in the range from about 3 x 10**-4 to about 10**-1 at a Q**2 of about 10**4 GeV**2. Furthermore, it is demonstrated that, once the quark and antiquark structure functions are constrained from the W+,W- and Z0 production dynamics, other quark-antiquark related scattering processes at the LHC like q-qbar --> W+W- can be predicted accurately. Thus, the lepton pseudorapidity distributions provide the key to a precise parton luminosity monitor at the LHC, with accuracies of about +-1% compared to the so far considered goal of +-5%.

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