Speaker
Summary
Vector boson production in p-p collisions in LHC Run-1 has been
extensively studied at the LHC. Charged and neutral current Drell-Yan
cross sections are sensitive to the parton distribution functions of
the proton and electroweak corrections. The measurements of the
neutral current Drell-Yan process in three distinct kinematic regions,
i.e. at the Z boson mass peak, below and above, are performed. The
results are compared to NLO Monte Carlo simulations and to NNLO QCD
predictions corrected for NLO EW effects calculated using various
parameterizations of the parton distribution functions.
Measurement of the transverse momentum of the Z boson is sensitive to soft
resummation effects for small momentum transfers and to multiple hard
jet emissions for large momentum transfers, probing QCD in a unique
way. The data are used to tune next-to-leading order plus parton
shower Monte Carlo simulations. An overview of these results is given.
Measurement of W+c production cross section at ATLAS 7 TeV has a unique sensitivity to the strange-quark density, which is poorly known at low x. W or Z boson production in association with b-quark jets, on the other hand, probes the b-quark density in the proton and the b-quark production by high-order QCD processes. The experimental results are compared to leading-order and next-to-leading-order QCD calculations and various parton density predictions.
